Pub Date : 2021-01-01Epub Date: 2021-06-30DOI: 10.5539/ijc.v13n2p17
Natarajan Raju, Rolf E Swenson
Preferential oxidation of primary hydroxyls in unprotected sugars and sugar amino acids is reported using inexpensive and readily available reagents. This method offers a specific oxidation protocol for a variety of carbohydrates. The stereochemical integrity of the starting materials was preserved and a simple workup yielded the products in good yields with high purity. The procedure is compatible with base sensitive groups like Fmoc. Both mono and disaccharides undergo oxidation regioselectively.
{"title":"Synthesis of Acids and Amino Acids by Selective Oxidation of Primary Hydroxyl Groups to Carboxylic acids in Sugars.","authors":"Natarajan Raju, Rolf E Swenson","doi":"10.5539/ijc.v13n2p17","DOIUrl":"10.5539/ijc.v13n2p17","url":null,"abstract":"<p><p>Preferential oxidation of primary hydroxyls in unprotected sugars and sugar amino acids is reported using inexpensive and readily available reagents. This method offers a specific oxidation protocol for a variety of carbohydrates. The stereochemical integrity of the starting materials was preserved and a simple workup yielded the products in good yields with high purity. The procedure is compatible with base sensitive groups like Fmoc. Both mono and disaccharides undergo oxidation regioselectively.</p>","PeriodicalId":13866,"journal":{"name":"International Journal of Chemistry","volume":"13 2","pages":"17-24"},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8411891/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"39385593","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Backgrounds and aims: Nutrition is the main way to receive the trace elements that human body needs. Lithium (Li) and calcium (Ca) are two trace elements, which have important roles in human body. There are a few studies about the amounts of calcium and lithium in canned tuna fish. The aim of this study was to determine the concentrations of calcium and lithium in canned tuna fishes. Materials and Methods: To this aim, 150 samples of canned tuna fishes from two well-known brands (Majid and Poolak), marketed in Khuzestan province of Iran, were obtained. Li contents of the samples were measured by atomic absorption spectrometry (AAS) with atomization in graphite furnace. Ca contents of the samples were measured by AAS using nitrous oxide-acetylene flame. Results: The mean concentrations of calcium in canned tuna fish of Majid and Poolak brands were 448.47 and 398.22 mg/kg, respectively. Additionally, the mean concentrations of lithium in canned tuna fish of Majid and Poolak brands were 38.42 and 39.67 mg/kg, respectively. The mean concentration of calcium in the investigated canned tuna samples fish was lower than provisional tolerable intake (PTI) per day (1000 ppm) set by World Health Organization (WHO) and Environmental Protection Agency (EPA). However, the mean concentration of lithium in the studied canned tuna fish samples was higher than PTI/day (0.650- 3.1 ppm) Set by EPA. Conclusion: The results of current study showed that the marine food industries need a more-precise and serious monitoring by public health organizations. Additionally, protecting the marine environment from pollutions is an obligation that needs the attention of related organizations and authorities.
{"title":"Determining the Lithium and Calcium Concentrations in Canned Tuna Fish in Iran","authors":"Mona Daraei, H. Kalantari, Zahra Nazari Khoragani","doi":"10.5539/ijc.v13n2p35","DOIUrl":"https://doi.org/10.5539/ijc.v13n2p35","url":null,"abstract":"Backgrounds and aims: Nutrition is the main way to receive the trace elements that human body needs. Lithium (Li) and calcium (Ca) are two trace elements, which have important roles in human body. There are a few studies about the amounts of calcium and lithium in canned tuna fish. The aim of this study was to determine the concentrations of calcium and lithium in canned tuna fishes. Materials and Methods: To this aim, 150 samples of canned tuna fishes from two well-known brands (Majid and Poolak), marketed in Khuzestan province of Iran, were obtained. Li contents of the samples were measured by atomic absorption spectrometry (AAS) with atomization in graphite furnace. Ca contents of the samples were measured by AAS using nitrous oxide-acetylene flame. Results: The mean concentrations of calcium in canned tuna fish of Majid and Poolak brands were 448.47 and 398.22 mg/kg, respectively. Additionally, the mean concentrations of lithium in canned tuna fish of Majid and Poolak brands were 38.42 and 39.67 mg/kg, respectively. The mean concentration of calcium in the investigated canned tuna samples fish was lower than provisional tolerable intake (PTI) per day (1000 ppm) set by World Health Organization (WHO) and Environmental Protection Agency (EPA). However, the mean concentration of lithium in the studied canned tuna fish samples was higher than PTI/day (0.650- 3.1 ppm) Set by EPA. Conclusion: The results of current study showed that the marine food industries need a more-precise and serious monitoring by public health organizations. Additionally, protecting the marine environment from pollutions is an obligation that needs the attention of related organizations and authorities.","PeriodicalId":13866,"journal":{"name":"International Journal of Chemistry","volume":"58 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76543839","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}
Hypo-magnetic fields (HMFs) are static magnetic fields that are significantly weaker than the geomagnetic field and are found in interplanetary space, on Mars, and the Moon. Understanding the mechanism of the biological effects of HMFs is an important topic in magnetobiology. Human physiology studies have shown that HMFs cause various adverse health effects such as increased blood pressure and blood flow rate. Previous studies on the effects of HMFs on cells revealed a variety of effects, such as a change in growth rate, a decrease in mitochondrial membrane potential, and an increase in reactive oxygen species. A decrease in mitochondrial membrane potential (DFm) may seriously impair cellular activity by interfering with the production of ATP. Thus, a deeper investigation of the effects of HMFs on mitochondrial function could provide clues to understanding the adverse effects of HMFs. In the present study, we used mouse macrophage RAW264 cells to investigate the effects of an HMF on mitochondrial membrane potential, mitochondrial superoxide anion (O2-) production, and cell proliferation.
{"title":"Evaluation of the Effects of Hypo-Magnetic Fields on Mouse Macrophage RAW264 Cells","authors":"Nipitpon Srimai, Wasawat Kiatarkom, H. Miyata","doi":"10.5539/ijc.v13n1p12","DOIUrl":"https://doi.org/10.5539/ijc.v13n1p12","url":null,"abstract":"Hypo-magnetic fields (HMFs) are static magnetic fields that are significantly weaker than the geomagnetic field and are found in interplanetary space, on Mars, and the Moon. Understanding the mechanism of the biological effects of HMFs is an important topic in magnetobiology. Human physiology studies have shown that HMFs cause various adverse health effects such as increased blood pressure and blood flow rate. Previous studies on the effects of HMFs on cells revealed a variety of effects, such as a change in growth rate, a decrease in mitochondrial membrane potential, and an increase in reactive oxygen species. A decrease in mitochondrial membrane potential (DFm) may seriously impair cellular activity by interfering with the production of ATP. Thus, a deeper investigation of the effects of HMFs on mitochondrial function could provide clues to understanding the adverse effects of HMFs. In the present study, we used mouse macrophage RAW264 cells to investigate the effects of an HMF on mitochondrial membrane potential, mitochondrial superoxide anion (O2-) production, and cell proliferation.","PeriodicalId":13866,"journal":{"name":"International Journal of Chemistry","volume":"2 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75402997","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}
Marouane Amine, Fatima Asafar, L. Bilali, M. Nadifiyine
Phosphate is a very important natural resource in Morocco and one of the secondary resources of rare earth elements. Our study is particularly interested in Youssoufia phosphate, which contains 228.77 ppm of rare earth elements (ΣREEs). The purpose of our work is to study the influence of different parameters (acid concentration, solid/liquid ratio and temperature) in order to determine the optimal conditions for the leaching of rare earths. An experimental design (Doehlert matrix) has been drawn up to optimize the experimental conditions of the leaching. All tests were made with nitric acid at different concentrations varying between 1.5M and 4.5M with a solid/liquid ratio of 1/12 to 1/6; reaction temperature and duration are respectively 20°C to 80 °C and 60 min. The optimal conditions are obtained when using 69 °C as temperature, 4.1 M as acid concentration and 1/9 as solid/liquid ratio.
{"title":"Optimization of Nitric Acid Leaching of Rare Earth Elements From Moroccan Natural Phosphate","authors":"Marouane Amine, Fatima Asafar, L. Bilali, M. Nadifiyine","doi":"10.5539/ijc.v13n1p1","DOIUrl":"https://doi.org/10.5539/ijc.v13n1p1","url":null,"abstract":"Phosphate is a very important natural resource in Morocco and one of the secondary resources of rare earth elements. Our study is particularly interested in Youssoufia phosphate, which contains 228.77 ppm of rare earth elements (ΣREEs). The purpose of our work is to study the influence of different parameters (acid concentration, solid/liquid ratio and temperature) in order to determine the optimal conditions for the leaching of rare earths. An experimental design (Doehlert matrix) has been drawn up to optimize the experimental conditions of the leaching. All tests were made with nitric acid at different concentrations varying between 1.5M and 4.5M with a solid/liquid ratio of 1/12 to 1/6; reaction temperature and duration are respectively 20°C to 80 °C and 60 min. The optimal conditions are obtained when using 69 °C as temperature, 4.1 M as acid concentration and 1/9 as solid/liquid ratio.","PeriodicalId":13866,"journal":{"name":"International Journal of Chemistry","volume":"28 1","pages":"1"},"PeriodicalIF":0.0,"publicationDate":"2020-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89819578","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}
H. Noritomi, S. Kurihara, N. Endo, Satoru Kato, K. Uchiyama
We have found that HEWL (hen egg white lysozyme) is effectively immobilized on biochar through adsorption, and the amount of HEWL adsorbed on biochar is strongly dependent on the pH value of adsorption solutions. The structure of HEWL adsorbed on biochar changed by the pH value of adsorption solutions and became similar to that of native HEWL at acidic pH value, although the structure of HEWL solubilized in the solution was the same in the range between pH 4 and 9. On the other hand, the lytic activity of biochar-adsorbed HEWL toward Micrococcus lysodeikticus was markedly influenced by the pH value of adsorption solutions and increased with decreasing the pH value. Moreover, the addition of KCl to adsorption solutions enhanced the lytic activity of biochar-adsorbed HEWL.
{"title":"Enhancement of Lytic Activity of HEWL Adsorbed on Biochar by the Optimization of Adsorption Conditions","authors":"H. Noritomi, S. Kurihara, N. Endo, Satoru Kato, K. Uchiyama","doi":"10.5539/IJC.V12N2P45","DOIUrl":"https://doi.org/10.5539/IJC.V12N2P45","url":null,"abstract":"We have found that HEWL (hen egg white lysozyme) is effectively immobilized on biochar through adsorption, and the amount of HEWL adsorbed on biochar is strongly dependent on the pH value of adsorption solutions. The structure of HEWL adsorbed on biochar changed by the pH value of adsorption solutions and became similar to that of native HEWL at acidic pH value, although the structure of HEWL solubilized in the solution was the same in the range between pH 4 and 9. On the other hand, the lytic activity of biochar-adsorbed HEWL toward Micrococcus lysodeikticus was markedly influenced by the pH value of adsorption solutions and increased with decreasing the pH value. Moreover, the addition of KCl to adsorption solutions enhanced the lytic activity of biochar-adsorbed HEWL.","PeriodicalId":13866,"journal":{"name":"International Journal of Chemistry","volume":"27 1","pages":"45"},"PeriodicalIF":0.0,"publicationDate":"2020-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75803693","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}
The use of Acanthus pubescens flower extracts as natural eco-friendly substitutes for synthetic acid base indicators is experimentally confirmed. In this study, it is indicated that ethanolic and acidified ethanol extracts of Acanthus pubescens flower are good replacements to phenolphthalein, bromothymol blue and methyl red in acid-base titrations involving a strong acid versus strong base and a strong acid versus weak base. They can also be used as effective substitutes to phenolphthalein in a weak acid versus strong base titrations. And also the acidified ethanol extracts can be used in place of phenolphthalein and bromothymol blue while the ethanol extracts can replace methyl red in weak acid versus weak base titrations. It is also concluded that the use of Acanthus pubescens flower extract as an indicator in all types of acid base titrations is beneficial because of its economy, eco-friendly nature, ease of preparation, availability, simplicity, non-carcinogenicity, precision and accuracy of results.
{"title":"Extraction of Green Acid-Base Indicators From Acanthus Pubescens Flower for Use in the School Laboratory","authors":"S. Leshe, H. Baye","doi":"10.5539/ijc.v12n2p35","DOIUrl":"https://doi.org/10.5539/ijc.v12n2p35","url":null,"abstract":"The use of Acanthus pubescens flower extracts as natural eco-friendly substitutes for synthetic acid base indicators is experimentally confirmed. In this study, it is indicated that ethanolic and acidified ethanol extracts of Acanthus pubescens flower are good replacements to phenolphthalein, bromothymol blue and methyl red in acid-base titrations involving a strong acid versus strong base and a strong acid versus weak base. They can also be used as effective substitutes to phenolphthalein in a weak acid versus strong base titrations. And also the acidified ethanol extracts can be used in place of phenolphthalein and bromothymol blue while the ethanol extracts can replace methyl red in weak acid versus weak base titrations. It is also concluded that the use of Acanthus pubescens flower extract as an indicator in all types of acid base titrations is beneficial because of its economy, eco-friendly nature, ease of preparation, availability, simplicity, non-carcinogenicity, precision and accuracy of results.","PeriodicalId":13866,"journal":{"name":"International Journal of Chemistry","volume":"13 1","pages":"35"},"PeriodicalIF":0.0,"publicationDate":"2020-10-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75205318","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}
International Journal of Chemistry wishes to acknowledge the following individuals for their assistance with peer review of manuscripts for this issue. Their help and contributions in maintaining the quality of the journal is greatly appreciated. Many authors, regardless of whether International Journal of Chemistry publishes their work, appreciate the helpful feedback provided by the reviewers. Reviewers for Volume 12, Number 2 Abdul Rouf Dar, University of Florida, USA Ahmad Galadima, Usmanu Danfodiyo University, Nigeria Ahmet Ozan Gezerman, Yildiz Technical University, Turkey Amal A. M. Elgharbawy, International Institute for Halal Research and Training, Malaysia Ayodele Temidayo Odularu, University of Fort Hare, South Africa Donatus Bekindaka Eni, University of Buea, Cameroon Elnaz Rostampour, Islamic Azad University, Iran Fatima Tuz Johra, Kookmin University, Bangladesh Hesham G. Ibrahim, Al-Mergheb University, Libya Hongbin Liu, University of Washington, USA Kevin C. Cannon, Penn State Abington, USA Khaldun M. Al Azzam, Batterjee Medical College for Sciences & Technology, Saudi Arabia Nanda Gunawardhana, Saga University, Japan Nanthaphong Khamthong, Rangsit University, Thailand Nejib Hussein Mekni, Al Manar University, Tunisia Rabia Rehman, University of the Punjab, Pakistan Rafael Gomes da Silveira, Federal Institute of Education, Brazil Sintayehu Leshe, Debre Markos University, Ethiopia Sitaram Acharya, Texas Christian University, USA Syed A. A. Rizvi, Hampton University, USA Tony Di Feo, Natural Resources Canada, Canada Vinícius Silva Pinto, Instituto Federal Goiano, Brazil Albert John On behalf of, The Editorial Board of International Journal of Chemistry Canadian Center of Science and Education
《国际化学杂志》希望感谢以下个人对本期稿件的同行评审提供的帮助。我们非常感谢他们在保持期刊质量方面的帮助和贡献。许多作者，不管《国际化学杂志》是否发表他们的作品，都很感激审稿人提供的有益反馈。第12卷第2卷审校人Abdul Rouf Dar，佛罗里达大学，美国Ahmad Galadima, Usmanu Danfodiyo大学，尼日利亚Ahmet Ozan Gezerman, Yildiz技术大学，土耳其Amal A. M. elgharawy，国际清真研究与培训研究所，马来西亚Ayodele Temidayo Odularu，黑尔堡大学，南非Donatus Bekindaka Eni, Buea大学，喀麦隆Elnaz Rostampour，伊斯兰阿扎德大学，伊朗Fatima Tuz Johra，国民大学，孟加拉国Hesham G. Ibrahim、Al- mergheb大学、利比亚Hongbin Liu、美国华盛顿大学Kevin C. Cannon、宾州州立大学阿宾顿分校、美国Khaldun M. Al Azzam、巴特吉科学与技术医学院、沙特阿拉伯Nanda Gunawardhana、Saga大学、日本Nanthaphong Khamthong、Rangsit大学、泰国Nejib Hussein Mekni、Al Manar大学、突尼斯Rabia Rehman、巴基斯坦旁遮普大学Rafael Gomes da Silveira、联邦教育学院、巴西Sintayehu Leshe, Debre Markos大学，埃塞俄比亚Sitaram Acharya，美国德克萨斯基督教大学Syed A. A. Rizvi，美国汉普顿大学，加拿大Tony Di Feo，加拿大自然资源部Vinícius Silva Pinto，巴西Goiano联邦研究所，巴西Albert John代表，国际化学杂志编辑委员会加拿大科学与教育中心
{"title":"Reviewer Acknowledgements for International Journal of Chemistry, Vol. 12, No. 2","authors":"A. John","doi":"10.5539/ijc.v12n2p54","DOIUrl":"https://doi.org/10.5539/ijc.v12n2p54","url":null,"abstract":"International Journal of Chemistry wishes to acknowledge the following individuals for their assistance with peer review of manuscripts for this issue. Their help and contributions in maintaining the quality of the journal is greatly appreciated. Many authors, regardless of whether International Journal of Chemistry publishes their work, appreciate the helpful feedback provided by the reviewers. \u0000 \u0000Reviewers for Volume 12, Number 2 \u0000 \u0000Abdul Rouf Dar, University of Florida, USA \u0000 \u0000Ahmad Galadima, Usmanu Danfodiyo University, Nigeria \u0000 \u0000Ahmet Ozan Gezerman, Yildiz Technical University, Turkey \u0000 \u0000Amal A. M. Elgharbawy, International Institute for Halal Research and Training, Malaysia \u0000 \u0000Ayodele Temidayo Odularu, University of Fort Hare, South Africa \u0000 \u0000Donatus Bekindaka Eni, University of Buea, Cameroon \u0000 \u0000Elnaz Rostampour, Islamic Azad University, Iran \u0000 \u0000Fatima Tuz Johra, Kookmin University, Bangladesh \u0000 \u0000Hesham G. Ibrahim, Al-Mergheb University, Libya \u0000 \u0000Hongbin Liu, University of Washington, USA \u0000 \u0000Kevin C. Cannon, Penn State Abington, USA \u0000 \u0000Khaldun M. Al Azzam, Batterjee Medical College for Sciences & Technology, Saudi Arabia \u0000 \u0000Nanda Gunawardhana, Saga University, Japan \u0000 \u0000Nanthaphong Khamthong, Rangsit University, Thailand \u0000 \u0000Nejib Hussein Mekni, Al Manar University, Tunisia \u0000 \u0000Rabia Rehman, University of the Punjab, Pakistan \u0000 \u0000Rafael Gomes da Silveira, Federal Institute of Education, Brazil \u0000 \u0000Sintayehu Leshe, Debre Markos University, Ethiopia \u0000 \u0000Sitaram Acharya, Texas Christian University, USA \u0000 \u0000Syed A. A. Rizvi, Hampton University, USA \u0000 \u0000Tony Di Feo, Natural Resources Canada, Canada \u0000 \u0000Vinícius Silva Pinto, Instituto Federal Goiano, Brazil \u0000 \u0000Albert John \u0000 \u0000On behalf of, \u0000 \u0000The Editorial Board of International Journal of Chemistry \u0000 \u0000Canadian Center of Science and Education","PeriodicalId":13866,"journal":{"name":"International Journal of Chemistry","volume":"47 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-10-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77771876","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}
Geological storage of anthropogenic carbon dioxide is regarded as a technically and economically viable strategy for mitigating carbon dioxide induced climate warming. Central to geological storage of anthropogenic carbon dioxide is the water rock interaction, which has a direct bearing on pH induced wettability evolution in saline aquifers. Consequently, understanding contact angle trend versus injected gas pressure is useful, considering its relationship to pH evolution in formation brine due to dissolved gas at prevailing temperatures and salinities. Several research works have published experimental data on contact angle versus pressure pertaining to geological conditions of anthropogenic carbon storage. In the present study, we have used thermodynamic theories relating to a surface charge model, contact angle and the classical Nernst equation to derive a logarithmic pH dependent contact angle equation. Considering the relationship between carbon dioxide solubility and pressure for a given temperature and salinity as well as the link between pH and the extent of solubility, we have plotted calculated contact angles versus corresponding pressures. Results of the plots obtained compare well with literature values. Therefore, given the lack of theoretical approach regarding contact angle versus pressure, our research work fills the knowledge gap considering the novelty in the derivation of the pH dependent contact angle equation.
{"title":"Modeling of Contact Angle versus pH and Derivation of Contact Angle versus Pressure in Deep Saline Aquifers under Geological Carbon Storage","authors":"A. Miadonye, M. Amadu","doi":"10.5539/ijc.v12n2p19","DOIUrl":"https://doi.org/10.5539/ijc.v12n2p19","url":null,"abstract":"Geological storage of anthropogenic carbon dioxide is regarded as a technically and economically viable strategy for mitigating carbon dioxide induced climate warming. \u0000 \u0000Central to geological storage of anthropogenic carbon dioxide is the water rock interaction, which has a direct bearing on pH induced wettability evolution in saline aquifers. Consequently, understanding contact angle trend versus injected gas pressure is useful, considering its relationship to pH evolution in formation brine due to dissolved gas at prevailing temperatures and salinities. Several research works have published experimental data on contact angle versus pressure pertaining to geological conditions of anthropogenic carbon storage. In the present study, we have used thermodynamic theories relating to a surface charge model, contact angle and the classical Nernst equation to derive a logarithmic pH dependent contact angle equation. Considering the relationship between carbon dioxide solubility and pressure for a given temperature and salinity as well as the link between pH and the extent of solubility, we have plotted calculated contact angles versus corresponding pressures. Results of the plots obtained compare well with literature values. Therefore, given the lack of theoretical approach regarding contact angle versus pressure, our research work fills the knowledge gap considering the novelty in the derivation of the pH dependent contact angle equation.","PeriodicalId":13866,"journal":{"name":"International Journal of Chemistry","volume":"42 11","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91499909","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 : 2020-10-05DOI: 10.22159/ijcr.2020v4i4.131
C. Azhagumeena, P. Bharathi
The medicinal plant Calycopteris floribunda Roxb. Lam. commonly known as “Ukshi” belongs to the family Combretaceae. Calycopteris floribunda is a large evergreen climbing shrub native of Bangladesh and India. It is widely distributed in the central and southern parts of India and also found in south-east Asian countries. The branches store abundant water for its own purpose as well to quench the thirst of the forest dwellers. Hence the forest habitants are referring this plant as a lifesaver. Calycopteris floribunda finds a place in traditional Asian medicinal systems, including Ayurveda, Folk and Unani. The anti-inflammatory flavonoid compound calycopterin is present in the leaves of the plant. In Ayurveda this plant is used to treat for leprosy, malarial fever, dysentery, ulcers, vomiting, wound healing and cytotoxic. It is hepatoprotective, antimicrobial, antiviral and used for numerous ailments. A review on the medicinal plant Calycopteris floribunda was done in the period from 1934 to 2020. Here, we are focusing on the isolation, phytochemical constitution and pharmacological potential of Calycopteris floribunda plant.
{"title":"A REVIEW ON PHYTOCHEMISTRY AND PHARMACOLOGY OF CALYCOPTERIS FLORIBUNDA ROXB. LAM","authors":"C. Azhagumeena, P. Bharathi","doi":"10.22159/ijcr.2020v4i4.131","DOIUrl":"https://doi.org/10.22159/ijcr.2020v4i4.131","url":null,"abstract":"The medicinal plant Calycopteris floribunda Roxb. Lam. commonly known as “Ukshi” belongs to the family Combretaceae. Calycopteris floribunda is a large evergreen climbing shrub native of Bangladesh and India. It is widely distributed in the central and southern parts of India and also found in south-east Asian countries. The branches store abundant water for its own purpose as well to quench the thirst of the forest dwellers. Hence the forest habitants are referring this plant as a lifesaver. Calycopteris floribunda finds a place in traditional Asian medicinal systems, including Ayurveda, Folk and Unani. The anti-inflammatory flavonoid compound calycopterin is present in the leaves of the plant. In Ayurveda this plant is used to treat for leprosy, malarial fever, dysentery, ulcers, vomiting, wound healing and cytotoxic. It is hepatoprotective, antimicrobial, antiviral and used for numerous ailments. A review on the medicinal plant Calycopteris floribunda was done in the period from 1934 to 2020. Here, we are focusing on the isolation, phytochemical constitution and pharmacological potential of Calycopteris floribunda plant.","PeriodicalId":13866,"journal":{"name":"International Journal of Chemistry","volume":"1 1","pages":"1-8"},"PeriodicalIF":0.0,"publicationDate":"2020-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91188195","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 : 2020-10-05DOI: 10.22159/ijcr.2020v4i4.128
A. Pimpale, R. Kakde
Objective: The present work was focused on the development and validation of the reversed-phase high-performance liquid chromatography (RP-HPLC) method, which is simple, rapid, precise, accurate, sensitive, economical, and stability-indicating for the quantification of rosuvastatin calcium in bulk and tablet formulation. Methods: The separation was attained on reversed-phase Princeton (C18) column with dimensions (250 mm × 4.6 mm, 5μ) employing buffer, which is a mixture of water (pH 3.0, adjusted with orthophosphoric acid) and methanol in the ratio (20:80) v/v as mobile phase, at flow rate 1.0 ml/min. and detection was carried out at wavelength 240 nm. The retention time under the optimized condition of rosuvastatin calcium was found to be 2.844 min. Results: The linearity of the method was demonstrated in the concentration range of 6-16 µg/ml for rosuvastatin calcium with a correlation coefficient (r2) of 0.9999. The percentage relative standard deviation was ˂2% and percentage recovery was found to be 100.12-101.37% for rosuvastatin calcium. The assay of marketed tablet formulations was found to be 98.99%. Conclusion: The developed RP-HPLC technique was found to be simple, specific, sensitive, rapid, linear, accurate, precise, and economical and will be used for regular quality control of rosuvastatin calcium in bulk and tablet formulations.
{"title":"STABILITY-INDICATING METHOD DEVELOPMENT AND VALIDATION FOR THE ESTIMATION OF ROSUVASTATIN CALCIUM IN PHARMACEUTICAL DOSAGE FORM BY REVERSE PHASE-HIGH PERFORMANCE LIQUID CHROMATOGRAPHY","authors":"A. Pimpale, R. Kakde","doi":"10.22159/ijcr.2020v4i4.128","DOIUrl":"https://doi.org/10.22159/ijcr.2020v4i4.128","url":null,"abstract":"Objective: The present work was focused on the development and validation of the reversed-phase high-performance liquid chromatography (RP-HPLC) method, which is simple, rapid, precise, accurate, sensitive, economical, and stability-indicating for the quantification of rosuvastatin calcium in bulk and tablet formulation. \u0000Methods: The separation was attained on reversed-phase Princeton (C18) column with dimensions (250 mm × 4.6 mm, 5μ) employing buffer, which is a mixture of water (pH 3.0, adjusted with orthophosphoric acid) and methanol in the ratio (20:80) v/v as mobile phase, at flow rate 1.0 ml/min. and detection was carried out at wavelength 240 nm. The retention time under the optimized condition of rosuvastatin calcium was found to be 2.844 min. \u0000Results: The linearity of the method was demonstrated in the concentration range of 6-16 µg/ml for rosuvastatin calcium with a correlation coefficient (r2) of 0.9999. The percentage relative standard deviation was ˂2% and percentage recovery was found to be 100.12-101.37% for rosuvastatin calcium. The assay of marketed tablet formulations was found to be 98.99%. \u0000Conclusion: The developed RP-HPLC technique was found to be simple, specific, sensitive, rapid, linear, accurate, precise, and economical and will be used for regular quality control of rosuvastatin calcium in bulk and tablet formulations.","PeriodicalId":13866,"journal":{"name":"International Journal of Chemistry","volume":"10 1","pages":"9-16"},"PeriodicalIF":0.0,"publicationDate":"2020-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78757195","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}
扫码关注我们
求助内容：
应助结果提醒方式：
京公网安备 11010802042870号