Pub Date : 2024-02-29DOI: 10.33394/hjkk.v12i1.10367
Sari Nur Fitri, Tulus Junanto, Risya Sasri, H. Hairida, Rahmat Rasmawan
The industrial revolution 4.0 makes us develop into adaptive humans. 21st century skills, that involves thinking critically and inventiveness, abilities to communicate and teamworks, are needed to adapt to all technological changes. Among the four 21st century skills, creative thinking skills are needed to develop innovative ideas in answering problems in the learning process. The variable of this research is students’ creative thinking skills. The aspects studied consist of originality, fluency, flexibility, and elaboration. The research process was conducted with descriptive quantitative using a sample of 35 students of class XI IPA at SMA Negeri 1 Mempawah Hilir. The research instruments used were creative thinking test questions in the form of descriptions and interview guidelines. The results of data analysis stated that students’ creative thinking skills were included in the insufficient category with a percentage of 74,29% of the sample. The average value in originality is 42,68%, while the aspects of fluency, flexibility, and elaboration have the same average of 36,78%. Several factors cause the low level of students’ creative thinking skills; namely students still memorize the material in the book, lack of learning experience, students tend to give answers as they are because they think they will get a score even though they only write a few answers, and another factor is that students lack focus when working on test questions.
{"title":"Creative Thinking Skills in Colloidal Material of 11th grade Science Students at SMAN 1 Mempawah Hilir","authors":"Sari Nur Fitri, Tulus Junanto, Risya Sasri, H. Hairida, Rahmat Rasmawan","doi":"10.33394/hjkk.v12i1.10367","DOIUrl":"https://doi.org/10.33394/hjkk.v12i1.10367","url":null,"abstract":"The industrial revolution 4.0 makes us develop into adaptive humans. 21st century skills, that involves thinking critically and inventiveness, abilities to communicate and teamworks, are needed to adapt to all technological changes. Among the four 21st century skills, creative thinking skills are needed to develop innovative ideas in answering problems in the learning process. The variable of this research is students’ creative thinking skills. The aspects studied consist of originality, fluency, flexibility, and elaboration. The research process was conducted with descriptive quantitative using a sample of 35 students of class XI IPA at SMA Negeri 1 Mempawah Hilir. The research instruments used were creative thinking test questions in the form of descriptions and interview guidelines. The results of data analysis stated that students’ creative thinking skills were included in the insufficient category with a percentage of 74,29% of the sample. The average value in originality is 42,68%, while the aspects of fluency, flexibility, and elaboration have the same average of 36,78%. Several factors cause the low level of students’ creative thinking skills; namely students still memorize the material in the book, lack of learning experience, students tend to give answers as they are because they think they will get a score even though they only write a few answers, and another factor is that students lack focus when working on test questions.","PeriodicalId":346446,"journal":{"name":"Hydrogen: Jurnal Kependidikan Kimia","volume":"26 47","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140409056","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Canistel fruit is a fruit that is not cultivated and is not known to many people because of limited information about this fruit. In the field of biochemistry, analysis of the essential amino acids contained in canistel fruit has never been carried out. The aim of this research is to determine the type and levels of essential amino acids in Canistel fruit as a source of vegetable protein in an effort to diversify food. The sample used was Canistel fruit. The method used was chromatography using UPLC with a C18 column, PDA detector, gradient pump system, and column temperature of 49⁰C. 15 types of amino acids were obtained, consisting of 7 essential amino acids and 8 non-essential amino acids. Essential amino acids are L-Fenilalanin (994,64 mg/kg), L- Isoleusin (704,58 mg/kg), L-Valin (876,69 mg/kg), L-Lisin 1.068,36 mg/kg), L- Leusin (1.199,45 mg/kg), L-Treonin (857,16 mg/kg), and LHistidin (421,03 mg/kg)and 8 non-essential amino acid are L-Serin (957,38 mg/kg), L-Asam glutamat (2.137,7 mg/kg), L-Alanin (1.070,01 mg/kg), LArginin (838,15 mg/kg), L-Glisin (1.101,56), L-asam aspartate (1.900,63 mg/kg), L-Tirosin (141,90 mg/kg), and L-Prolin (1.146,84 mg/kg).
{"title":"An Analysis of Essential Amino Acid Contents of Canistel Fruit (Pouteria campechiana) as A Source of Vegetable Protein in An Effort of Food Diversification","authors":"Andi Ifriany Harun, Risya Sasri, Nyemas Firda Diannisa, Yunita Puspasari","doi":"10.33394/hjkk.v12i1.10491","DOIUrl":"https://doi.org/10.33394/hjkk.v12i1.10491","url":null,"abstract":"Canistel fruit is a fruit that is not cultivated and is not known to many people because of limited information about this fruit. In the field of biochemistry, analysis of the essential amino acids contained in canistel fruit has never been carried out. The aim of this research is to determine the type and levels of essential amino acids in Canistel fruit as a source of vegetable protein in an effort to diversify food. The sample used was Canistel fruit. The method used was chromatography using UPLC with a C18 column, PDA detector, gradient pump system, and column temperature of 49⁰C. 15 types of amino acids were obtained, consisting of 7 essential amino acids and 8 non-essential amino acids. Essential amino acids are L-Fenilalanin (994,64 mg/kg), L- Isoleusin (704,58 mg/kg), L-Valin (876,69 mg/kg), L-Lisin 1.068,36 mg/kg), L- Leusin (1.199,45 mg/kg), L-Treonin (857,16 mg/kg), and LHistidin (421,03 mg/kg)and 8 non-essential amino acid are L-Serin (957,38 mg/kg), L-Asam glutamat (2.137,7 mg/kg), L-Alanin (1.070,01 mg/kg), LArginin (838,15 mg/kg), L-Glisin (1.101,56), L-asam aspartate (1.900,63 mg/kg), L-Tirosin (141,90 mg/kg), and L-Prolin (1.146,84 mg/kg).","PeriodicalId":346446,"journal":{"name":"Hydrogen: Jurnal Kependidikan Kimia","volume":"4 43","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140410422","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-02-29DOI: 10.33394/hjkk.v12i1.10322
F. D. N. Pamenang, Brigita Febrisilia Ngetje
Student worksheets serve as valuable teaching materials facilitating students' learning processes by expanding information on the targeted study topics. In the context of learning redox reactions, Depok 1stState Senior High School exclusively utilizes printed student worksheets. This research focuses on developing electronic student worksheets assisted by the Wizer.me platform for redox reaction material in class, aiming to enhance the efficacy of the learning materials. The research employs a Research and Development (R&D) method, utilizing the 4D development model modified to 3D. Instruments such as interview sheets, validation sheets, and questionnaires were employed, with a sample comprising 10 students from 10th grade. Data analysis was conducted descriptively. The results of the research indicate that 4D models were instrumental in developing electronic student worksheets due to their clearly directed steps or procedures. The developed product exhibits high validity, scoring an average of 84% for both the media and material aspects, with a content validity coefficient exceeding 0.8. Students responded positively to the student worksheet products, rating them high in design (82%), operational and visual communication (83%), resulting in an overall average score of 83%, classified as very practical. The developed product proves effective in supporting the learning of redox reactions.
{"title":"Development of Electronic Student Worksheets Assisted with Wizer.me on Redox Reactions Learning","authors":"F. D. N. Pamenang, Brigita Febrisilia Ngetje","doi":"10.33394/hjkk.v12i1.10322","DOIUrl":"https://doi.org/10.33394/hjkk.v12i1.10322","url":null,"abstract":"Student worksheets serve as valuable teaching materials facilitating students' learning processes by expanding information on the targeted study topics. In the context of learning redox reactions, Depok 1stState Senior High School exclusively utilizes printed student worksheets. This research focuses on developing electronic student worksheets assisted by the Wizer.me platform for redox reaction material in class, aiming to enhance the efficacy of the learning materials. The research employs a Research and Development (R&D) method, utilizing the 4D development model modified to 3D. Instruments such as interview sheets, validation sheets, and questionnaires were employed, with a sample comprising 10 students from 10th grade. Data analysis was conducted descriptively. The results of the research indicate that 4D models were instrumental in developing electronic student worksheets due to their clearly directed steps or procedures. The developed product exhibits high validity, scoring an average of 84% for both the media and material aspects, with a content validity coefficient exceeding 0.8. Students responded positively to the student worksheet products, rating them high in design (82%), operational and visual communication (83%), resulting in an overall average score of 83%, classified as very practical. The developed product proves effective in supporting the learning of redox reactions.","PeriodicalId":346446,"journal":{"name":"Hydrogen: Jurnal Kependidikan Kimia","volume":"4 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140410560","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-02-29DOI: 10.33394/hjkk.v12i1.10600
Rahayu Rahayu, Zarnida Widia Nengsih, Syukri Arief, Y. Rilda, Matlal Fajri Alif, S. Syukri
Kaolinite is a type of clay mineral that has the potential to be used as a heterogeneous catalyst in transesterification reactions. However, natural clay still contains a mixture of minerals that occur together. Therefore, as an effort to search for cheaper catalysts to reduce the price of biodiesel production, this study carried out the separation of kaolinite from natural clay and tested its performance as a catalyst in biodiesel production from Waste Cooking Oil (WCO). Separation of the kaolinite fraction was carried out with the help of NH4Cl as a dispersing agent. The main mineral composition of clay as quartz, kaolinite, montmorillonite and hematite. After the separation process, the crystallinity of the minerals experienced an increase marked by an increase in the intensity of several kaolinite peaks, namely in the 2θ 12.24° area from 103 to 108 and at 25.00° from 95 to 125. Thermal modification caused the loss of several kaolinite peaks in the area. 2θ 12.17°; 24.94° and 62.39°. The Si/Al ratio decreased after the fractionation and calcination processes. Average particle size of h-clay decreased from 27.61 µm to 21.09 µm in K-clay. The K-clay catalyst produced the highest conversion of palmitic acid at 42%, while c-K-clay produced the highest conversion of oleic acid and stearate at 30%. In addition, the density and water content of biodiesel catalyzed by K-clay and c-k-clay meet SNI standards. This finding has the potential to be further developed as a cost-effective catalyst based on natural resources in biodiesel production.
{"title":"Separation of Kaolinite from Clay Minerals and Its Catalytic Activity in Transesterification Reactions","authors":"Rahayu Rahayu, Zarnida Widia Nengsih, Syukri Arief, Y. Rilda, Matlal Fajri Alif, S. Syukri","doi":"10.33394/hjkk.v12i1.10600","DOIUrl":"https://doi.org/10.33394/hjkk.v12i1.10600","url":null,"abstract":"Kaolinite is a type of clay mineral that has the potential to be used as a heterogeneous catalyst in transesterification reactions. However, natural clay still contains a mixture of minerals that occur together. Therefore, as an effort to search for cheaper catalysts to reduce the price of biodiesel production, this study carried out the separation of kaolinite from natural clay and tested its performance as a catalyst in biodiesel production from Waste Cooking Oil (WCO). Separation of the kaolinite fraction was carried out with the help of NH4Cl as a dispersing agent. The main mineral composition of clay as quartz, kaolinite, montmorillonite and hematite. After the separation process, the crystallinity of the minerals experienced an increase marked by an increase in the intensity of several kaolinite peaks, namely in the 2θ 12.24° area from 103 to 108 and at 25.00° from 95 to 125. Thermal modification caused the loss of several kaolinite peaks in the area. 2θ 12.17°; 24.94° and 62.39°. The Si/Al ratio decreased after the fractionation and calcination processes. Average particle size of h-clay decreased from 27.61 µm to 21.09 µm in K-clay. The K-clay catalyst produced the highest conversion of palmitic acid at 42%, while c-K-clay produced the highest conversion of oleic acid and stearate at 30%. In addition, the density and water content of biodiesel catalyzed by K-clay and c-k-clay meet SNI standards. This finding has the potential to be further developed as a cost-effective catalyst based on natural resources in biodiesel production.","PeriodicalId":346446,"journal":{"name":"Hydrogen: Jurnal Kependidikan Kimia","volume":"16 3part1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140411965","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-02-29DOI: 10.33394/hjkk.v12i1.10813
Suci Rahma Hanifa, Ardiansyah Ardiansyah, N. Afrianis, Heppy Okmarisa
Sustainable Development Goals (SDGs) need to be implemented to create environmentally friendly chemistry learning. This can be done in an acid-base titration experiment using natural indicators of butterfly pea flowers. This research aims to produce a practicum guide for acid-base titrations using natural indicators of butterfly pea flowers that are valid and practicum. The research design uses the ADDIE research design, namely Analysis, Design, Development, Implementation, and Evaluation. The research results showed that butterfly pea flowers can be used as a natural indicator for acid-base titrations with color changes from pink (acidic condition) to blue (basic condition). The resulting learning media is a practicum guide which has a validity of 92% (very valid) and a practicality level of 88.75% (very practical). This data was analyzed using qualitative and quantitative analysis. The practicum guide developed is valid and practical to use as a practicum learning media in schools.
{"title":"Development of Acid-Base Titration Practicum Guide Using Natural Indicators of Butterfly Pea Flowers","authors":"Suci Rahma Hanifa, Ardiansyah Ardiansyah, N. Afrianis, Heppy Okmarisa","doi":"10.33394/hjkk.v12i1.10813","DOIUrl":"https://doi.org/10.33394/hjkk.v12i1.10813","url":null,"abstract":"Sustainable Development Goals (SDGs) need to be implemented to create environmentally friendly chemistry learning. This can be done in an acid-base titration experiment using natural indicators of butterfly pea flowers. This research aims to produce a practicum guide for acid-base titrations using natural indicators of butterfly pea flowers that are valid and practicum. The research design uses the ADDIE research design, namely Analysis, Design, Development, Implementation, and Evaluation. The research results showed that butterfly pea flowers can be used as a natural indicator for acid-base titrations with color changes from pink (acidic condition) to blue (basic condition). The resulting learning media is a practicum guide which has a validity of 92% (very valid) and a practicality level of 88.75% (very practical). This data was analyzed using qualitative and quantitative analysis. The practicum guide developed is valid and practical to use as a practicum learning media in schools.","PeriodicalId":346446,"journal":{"name":"Hydrogen: Jurnal Kependidikan Kimia","volume":"30 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140412508","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-02-29DOI: 10.33394/hjkk.v12i1.10593
Meta Yuliana
Tomatoes are the popular fruit but having short shelf life. This fruit require some treatment to maintain it’s quality during post-harvesting. Eco-enzyme is a fermented liquid, it’s made by fermentation process of fresh waste vegetables or fruits. Previous study showed that spraying tomatoes with Eco-enzyme can maintain the shelf life of tomatoes. This study aim to observe the effect of various liquid in Eco-enzyme fermentation and it’s effect to tomatoes preservation by soaking method. The research was experiment research using quality scale of tomatoes. The Eco-enzyme was fermented using different liquid such as water, coconut water and rice rinsed water. Tomatoes were soaked with each Eco-enzyme treatment with 50% and 100% concentration of each liquid for 5 minutes then rinsed them and observed their quality for 8 days during storage process. The control treatments are non-soaked and non-rinsed tomatoes. The observation include the quality of tomatoes and the quality of Eco-enzyme. The result of this study found that modification of liquid in Eco-enzyme fermentation have different effect for tomatoes preservation. Soaking and rinsing method also have different effect for tomatoes. The best treatment for EE1 is EE1-rinse-concentration 50%, EE2 is EE2-rinse-concentration 100%, and EE3 is EE3-rinse-concentration 50%. The soaking followed rinsing was the best method for tomatoes preservation treatment using Eco-enzyme.
{"title":"The Modification of Eco-Enzyme Liquid and The Effect on Tomato Preservation with Soaking Then Rinsing in Water Method","authors":"Meta Yuliana","doi":"10.33394/hjkk.v12i1.10593","DOIUrl":"https://doi.org/10.33394/hjkk.v12i1.10593","url":null,"abstract":"Tomatoes are the popular fruit but having short shelf life. This fruit require some treatment to maintain it’s quality during post-harvesting. Eco-enzyme is a fermented liquid, it’s made by fermentation process of fresh waste vegetables or fruits. Previous study showed that spraying tomatoes with Eco-enzyme can maintain the shelf life of tomatoes. This study aim to observe the effect of various liquid in Eco-enzyme fermentation and it’s effect to tomatoes preservation by soaking method. The research was experiment research using quality scale of tomatoes. The Eco-enzyme was fermented using different liquid such as water, coconut water and rice rinsed water. Tomatoes were soaked with each Eco-enzyme treatment with 50% and 100% concentration of each liquid for 5 minutes then rinsed them and observed their quality for 8 days during storage process. The control treatments are non-soaked and non-rinsed tomatoes. The observation include the quality of tomatoes and the quality of Eco-enzyme. The result of this study found that modification of liquid in Eco-enzyme fermentation have different effect for tomatoes preservation. Soaking and rinsing method also have different effect for tomatoes. The best treatment for EE1 is EE1-rinse-concentration 50%, EE2 is EE2-rinse-concentration 100%, and EE3 is EE3-rinse-concentration 50%. The soaking followed rinsing was the best method for tomatoes preservation treatment using Eco-enzyme.","PeriodicalId":346446,"journal":{"name":"Hydrogen: Jurnal Kependidikan Kimia","volume":"611 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140416914","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-02-29DOI: 10.33394/hjkk.v12i1.10820
Selfi Monica Aura, D. Deswati, E. Emriadi
This study aims to find the presence of microplastics in Shellfish through the literature review method of several studies conducted. The increase in plastic pollution in water systems since the 1950s has become a significant problem worldwide due to the slow decomposition rate. Microplastics, mainly primary and secondary, can accumulate in marine organisms such as Shellfish and enter the food chain, which is a concern for humans. Shellfish, especially M. galloprovincialis, can be used as bioindicators and bioremediation tools to tackle microplastic pollution. Microplastics are a severe problem in the world's oceans, especially in marginal and densely populated coastal areas. Marine organisms like Shellfish contain microplastics, which can cause physical damage and disrupt the immune system. Mytilus edulis clams and Crassostrea gigas oysters are the most consumed species with significant microplastic content. Research has also shown the presence of microplastics in Mytilus chilensis in the Gulf of Ushuaia, South America, with fibers and fragments being the most common types. Microplastics are also found in wild mussels in Tunisia, with the estimated annual dietary intake of microplastics by Tunisians through wild mussel consumption amounting to 4.2 particles per capita per year. Mussels of the genus Mytilus were proposed as guardian organisms to monitor microplastic pollution.
{"title":"The Presence of Microplastics in Shellfish: A Review","authors":"Selfi Monica Aura, D. Deswati, E. Emriadi","doi":"10.33394/hjkk.v12i1.10820","DOIUrl":"https://doi.org/10.33394/hjkk.v12i1.10820","url":null,"abstract":"This study aims to find the presence of microplastics in Shellfish through the literature review method of several studies conducted. The increase in plastic pollution in water systems since the 1950s has become a significant problem worldwide due to the slow decomposition rate. Microplastics, mainly primary and secondary, can accumulate in marine organisms such as Shellfish and enter the food chain, which is a concern for humans. Shellfish, especially M. galloprovincialis, can be used as bioindicators and bioremediation tools to tackle microplastic pollution. Microplastics are a severe problem in the world's oceans, especially in marginal and densely populated coastal areas. Marine organisms like Shellfish contain microplastics, which can cause physical damage and disrupt the immune system. Mytilus edulis clams and Crassostrea gigas oysters are the most consumed species with significant microplastic content. Research has also shown the presence of microplastics in Mytilus chilensis in the Gulf of Ushuaia, South America, with fibers and fragments being the most common types. Microplastics are also found in wild mussels in Tunisia, with the estimated annual dietary intake of microplastics by Tunisians through wild mussel consumption amounting to 4.2 particles per capita per year. Mussels of the genus Mytilus were proposed as guardian organisms to monitor microplastic pollution.","PeriodicalId":346446,"journal":{"name":"Hydrogen: Jurnal Kependidikan Kimia","volume":"15 12","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140413394","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-02-29DOI: 10.33394/hjkk.v12i1.10188
Ria Kemala Dewi, M. L. Firdaus, Euis Nursa'adah
One of the heavy metals that can pollute waters is the heavy metal chromium (Cr). Chromium has many important roles in life. Chromium material is widely used by humans for various purposes, especially in the industrial world. However, the large number of uses of chromium in the industrial world and the waste it generates can have a negative impact on the environment and human health. One way to deal with chromium pollution is by analyzing the presence of chromium in waters. The aim of this research is to analyze the presence of chromium using a simple, effective, economical and accurate method, namely the biosynthesis of gold nanoparticles using samples of starfruit (Averrhoa bilimbi) as a bioreductor rich in ascorbic acid, with a colorimetric method, namely a method based on the aggregation of gold nanoparticles with ascorbic acid from starfruit, which causes a shift in plasmons and causes color changes that can be seen by the eye. Based on the analysis results, data was obtained that gold nanoparticles synthesized from the starfruit bioreductor can detect chromium with a concentration of 10 ppm with optimum conditions at pH 5, temperature 75oC, optimum incubation time of 5 minutes and gold nanoparticles are selective and sensitive for detecting chromium.
{"title":"Biosynthesis of Gold Nanoparticles Using Wuluh Star Fruit (Averrhoa bilimbi) for Chromium Analysis","authors":"Ria Kemala Dewi, M. L. Firdaus, Euis Nursa'adah","doi":"10.33394/hjkk.v12i1.10188","DOIUrl":"https://doi.org/10.33394/hjkk.v12i1.10188","url":null,"abstract":"One of the heavy metals that can pollute waters is the heavy metal chromium (Cr). Chromium has many important roles in life. Chromium material is widely used by humans for various purposes, especially in the industrial world. However, the large number of uses of chromium in the industrial world and the waste it generates can have a negative impact on the environment and human health. One way to deal with chromium pollution is by analyzing the presence of chromium in waters. The aim of this research is to analyze the presence of chromium using a simple, effective, economical and accurate method, namely the biosynthesis of gold nanoparticles using samples of starfruit (Averrhoa bilimbi) as a bioreductor rich in ascorbic acid, with a colorimetric method, namely a method based on the aggregation of gold nanoparticles with ascorbic acid from starfruit, which causes a shift in plasmons and causes color changes that can be seen by the eye. Based on the analysis results, data was obtained that gold nanoparticles synthesized from the starfruit bioreductor can detect chromium with a concentration of 10 ppm with optimum conditions at pH 5, temperature 75oC, optimum incubation time of 5 minutes and gold nanoparticles are selective and sensitive for detecting chromium.","PeriodicalId":346446,"journal":{"name":"Hydrogen: Jurnal Kependidikan Kimia","volume":"2020 31","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140416179","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-02-29DOI: 10.33394/hjkk.v12i1.10772
Iffat Syafiqoh Afif, S. Suryati, A. Santoni
Cervical cancer is a life-threatening disease. The use of synthetic drugs for its treatment can have serious adverse effects on the body. Therefore, it is necessary to search for natural drugs that are safe for the body. One of the secondary metabolites contained in plants is essential oils (EO), EO are known to have activity as anti-cervical cancer. Genus Citrus is known for containing EO compounds, one of the species of the genus is Citrus×lemon (L) Osbeck. The purpose of this study is to identify the chemical components of the EO isolated from the leaves of C×limon and to evaluate its cytotoxic activity against cervical cancer. EO was isolated from C×limon leaves collected in Padang City, Indonesia using the hydrodistillation method. EO was then analyzed by GC-MS. To determine its cytotoxicity, BSLT was conducted, followed by molecular docking and MTT assays. The experiment yielded a yellow liquid with a density of 0,8684 g/mL and a yield of 0,181%. GC-MS analysis of the EO identified 56 chemical components, with the main compounds are (-)-β-pinene (7.32%), (-)-limonene (28.40%), geranial (5.54%), caryophyllene (5.22%). The EO showed high toxicity against Artemia salina L larvae, with an LC50 value of 3,697 µg/mL. Through molecular docking, it is known the (-)-limonene, geranial, (-)β-pinene and caryophyllene compounds as the main compounds in of EO are known to bind to form complexes with cervical cancer proteins (HPV18E6). MTT assay showed weak cytotoxic activity of EO against HeLa cells, with an IC50 of 218.9 µg/mL.
{"title":"Chemical Composition Analysis of Citrus×limon (L) Osbeck Leaf Essential Oil and Its Activity as an Anti-Cervical Cancer Agent","authors":"Iffat Syafiqoh Afif, S. Suryati, A. Santoni","doi":"10.33394/hjkk.v12i1.10772","DOIUrl":"https://doi.org/10.33394/hjkk.v12i1.10772","url":null,"abstract":"Cervical cancer is a life-threatening disease. The use of synthetic drugs for its treatment can have serious adverse effects on the body. Therefore, it is necessary to search for natural drugs that are safe for the body. One of the secondary metabolites contained in plants is essential oils (EO), EO are known to have activity as anti-cervical cancer. Genus Citrus is known for containing EO compounds, one of the species of the genus is Citrus×lemon (L) Osbeck. The purpose of this study is to identify the chemical components of the EO isolated from the leaves of C×limon and to evaluate its cytotoxic activity against cervical cancer. EO was isolated from C×limon leaves collected in Padang City, Indonesia using the hydrodistillation method. EO was then analyzed by GC-MS. To determine its cytotoxicity, BSLT was conducted, followed by molecular docking and MTT assays. The experiment yielded a yellow liquid with a density of 0,8684 g/mL and a yield of 0,181%. GC-MS analysis of the EO identified 56 chemical components, with the main compounds are (-)-β-pinene (7.32%), (-)-limonene (28.40%), geranial (5.54%), caryophyllene (5.22%). The EO showed high toxicity against Artemia salina L larvae, with an LC50 value of 3,697 µg/mL. Through molecular docking, it is known the (-)-limonene, geranial, (-)β-pinene and caryophyllene compounds as the main compounds in of EO are known to bind to form complexes with cervical cancer proteins (HPV18E6). MTT assay showed weak cytotoxic activity of EO against HeLa cells, with an IC50 of 218.9 µg/mL.","PeriodicalId":346446,"journal":{"name":"Hydrogen: Jurnal Kependidikan Kimia","volume":"2003 15","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140416490","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-06-24DOI: 10.33394/hjkk.v10i1.4954
M. Kurnia, H. Haryanto, Aulia Sanova, Citra Ayu Dewi
Chemistry subject is a science that focuses students 1on understanding the principles, theories, concepts and laws of chemistry and their application in real life. Chemo-Entrepreneurship4(CEP) is an approach that links chemistry with real objects. With this approach, students8are expected to be able to learn how to process a material into a valuable and useful product and be able to foster an entrepreneurial spirit. This study aims to develop interactive multimedia based on Chemo-Entrepreneurship in the form of an android application. The design of this study used the Lee & Owens model and involved 10 students of SMA Negeri 10 Tanjung6Jabung Timur. The research instrument used in this study was a questionnaire with analytical techniques in the form of qualitative data analysis and quantitative data analysis. The results of this study include: 1) interactive multimedia developed is declared feasible by media experts and material experts, with a percentage score of 87.2% and 88.57% respectively, 2) interactive multimedia is declared feasible based on the teacher's assessment with a percentage a score of 91.4%, 3) get a percentage of student responses of 94% with a very good category. Thus, it can be concluded that the student response is very positive to the chemo-entrepreneurship-based interactive multimedia that has been developed.
化学是一门使学生了解化学原理、理论、概念和规律及其在实际生活中的应用的科学。化学创业(CEP)是一种将化学与实物联系起来的方法。通过这种方法，学生们有望学会如何将材料加工成有价值和有用的产品，并能够培养创业精神。本研究旨在开发基于Chemo-Entrepreneurship的交互式多媒体，并以android应用程序的形式呈现。本研究的设计采用Lee & Owens模型，涉及SMA Negeri 10 Tanjung6Jabung Timur的10名学生。本研究使用的研究工具是问卷调查，采用定性数据分析和定量数据分析相结合的分析技术。本研究的结果包括:1)媒体专家和材料专家认为交互式多媒体开发可行，分别占87.2%和88.57%的百分比;2)教师评价认为交互式多媒体开发可行，占91.4%的百分比;3)学生回答的百分比为94%，类别非常好。因此，可以得出结论，学生对已经开发的基于化学创业的交互式多媒体的反应是非常积极的。
{"title":"Studi Respon Siswa Terhadap Pengembangan Multimedia Interaktif Berbasis Chemo-Entrepreneurship Berbentuk Aplikasi Android","authors":"M. Kurnia, H. Haryanto, Aulia Sanova, Citra Ayu Dewi","doi":"10.33394/hjkk.v10i1.4954","DOIUrl":"https://doi.org/10.33394/hjkk.v10i1.4954","url":null,"abstract":"Chemistry subject is a science that focuses students 1on understanding the principles, theories, concepts and laws of chemistry and their application in real life. Chemo-Entrepreneurship4(CEP) is an approach that links chemistry with real objects. With this approach, students8are expected to be able to learn how to process a material into a valuable and useful product and be able to foster an entrepreneurial spirit. This study aims to develop interactive multimedia based on Chemo-Entrepreneurship in the form of an android application. The design of this study used the Lee & Owens model and involved 10 students of SMA Negeri 10 Tanjung6Jabung Timur. The research instrument used in this study was a questionnaire with analytical techniques in the form of qualitative data analysis and quantitative data analysis. The results of this study include: 1) interactive multimedia developed is declared feasible by media experts and material experts, with a percentage score of 87.2% and 88.57% respectively, 2) interactive multimedia is declared feasible based on the teacher's assessment with a percentage a score of 91.4%, 3) get a percentage of student responses of 94% with a very good category. Thus, it can be concluded that the student response is very positive to the chemo-entrepreneurship-based interactive multimedia that has been developed.","PeriodicalId":346446,"journal":{"name":"Hydrogen: Jurnal Kependidikan Kimia","volume":"166 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132527202","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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