Fingerprint is a technology that can be used to identify a person. The dusting method is most often used on latent fingerprints because it is relatively easy and simple. However, the composition of the ingredients used in latent fingerprint powder is toxic and can be hazardous to health. This research was carried out using a new natural powder from Suji leaf as a simple, non-toxic, and cheaper. Suji leaf powder produces a green color that comes from the chlorophyll compounds contained in it. This chlorophyll compound will bind to alanine to identify latent fingerprints. The particle sizes used in this study were of 60-200 mesh. The results found that the particle sizes of 100 and 200 mesh provided good green contrast and clear visualization of the fingerprint patterns. Meanwhile, at the particle size of 60 and 80 mesh, it was found that the results were not clear visualized. The highest percentage of fingerprint patterns based on blood group, gender and ethnicity was found in form of loops. The percentage of fingerprint patterns formed based on the highest was of O 31.1; B 12.2; AB 8.8; and A 6.6 percent. The highest percentage of fingerprint patterns formed by gender were of 45.5 for women and 13.3 percent for men. The highest percentage of fingerprint patterns formed by ethnicity were Malay 21.1, Batak 20, and Javanese 17.7 percent.
{"title":"Pengembangan Metode Serbuk Daun Suji (Pleomele angustifolia N.E.Br) sebagai Identifikasi Sidik Jari Laten","authors":"Sri Adelila Sari, Desi Heriyanti Nasution","doi":"10.25077/jrk.v12i2.406","DOIUrl":"https://doi.org/10.25077/jrk.v12i2.406","url":null,"abstract":"Fingerprint is a technology that can be used to identify a person. The dusting method is most often used on latent fingerprints because it is relatively easy and simple. However, the composition of the ingredients used in latent fingerprint powder is toxic and can be hazardous to health. This research was carried out using a new natural powder from Suji leaf as a simple, non-toxic, and cheaper. Suji leaf powder produces a green color that comes from the chlorophyll compounds contained in it. This chlorophyll compound will bind to alanine to identify latent fingerprints. The particle sizes used in this study were of 60-200 mesh. The results found that the particle sizes of 100 and 200 mesh provided good green contrast and clear visualization of the fingerprint patterns. Meanwhile, at the particle size of 60 and 80 mesh, it was found that the results were not clear visualized. The highest percentage of fingerprint patterns based on blood group, gender and ethnicity was found in form of loops. The percentage of fingerprint patterns formed based on the highest was of O 31.1; B 12.2; AB 8.8; and A 6.6 percent. The highest percentage of fingerprint patterns formed by gender were of 45.5 for women and 13.3 percent for men. The highest percentage of fingerprint patterns formed by ethnicity were Malay 21.1, Batak 20, and Javanese 17.7 percent.","PeriodicalId":33366,"journal":{"name":"Jurnal Riset Kimia","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43951819","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}
Air bersih yang langka di perumahan Valencia Muaro Jambi yang masih dihadapi masyarakat, oleh sebab itu peneliti bertujuan untuk membantu masyarakat perumahan valensia muaro jambi untuk mendapatkan air bersih menggunakan Lapisan Multi Media-Filter Sabut Pinang (LMM-FSP). LMM-FSP merupakan suatu metoda pengolahan air dengan memanfaatkan tanah sebagai media utama yang dibentuk seperti balok bata dan disusun secara selang-seling diantara zeolit. Sistem LMM-FSP terbuat dari galon bekas dicuci bersih tinggi 40 cm berdiameter 28 cm, berisikan blok bata (12x7x4) cm campuran tanah vulkanik, arang, sabut pinang, serbuk besi (70 :10 :10: 5)%, lapisan permiable digunakan zeolit (1-3 mm). Sampel berasal dari sumur warga perumahan valencia, muaro jambi kota jambi. Penelitian dilakukan dengan variasi massa sabut pinang, laju alir 5, 10, 15, 20 mL/menit dan dua cara yaitu aerasi dan non aerasi, diperoleh efisiensi proses aerasi laju alir 5 ml/menit yang paling baik untuk menurunkan kadar pH; Bau; Nitrit; Nitrat; kekeruhan; Mn; Fe pada aerasi yaitu pH 7,5 ; Tidak Berbau; Nitrit 60,30 %, Nitrat 59,33%, Mn 70,10 %, Fe 73,20% dan pada non aerasi pH 7,3 ; Tidak Berbau, Nitrit 50,82%, Nitrat 48,37% Mn 60,91%, Fe 61,20 % Dari semua nilai efisiensi penurunan parameter sudah bisa dikatakan menuhi untuk syarat air bersih[1].
瓦伦西亚村Muaro Jambi住房中罕见的淡水仍然是人们所面临的，因此，研究人员的目标是帮助瓦伦西亚·Muaro Jambi社区利用多媒体滤镜层(LMM-FSP)获得清洁水。LMM-FSP是一种用水处理方法，利用土壤作为主要的媒介，在砖块上形成，并在zeolit之间交替铺设。LMM-FSP系统是由一加仑直径40厘米、28厘米的彻底清洗过的罐子组成，其中含有几块砖(12×7x4厘米)是火山土壤、木炭、椰壳、铁粉(70:10:10:5)的混合物，用于zeolit(1-3毫米)。样本来自来自瓦伦西亚住宅区的muaro jambi镇。研究是用槟榔的质量变化、利尿率5、10、15、20毫升/分钟，以及两种方式，即曝气和非曝气，最有效地降低pH值;气味;硝酸盐;硝酸;浑浊度;哪里;曝气上的Fe即pH 7.5;无味;硝酸盐60.30%，硝酸盐59.33%，Mn 70.10 %， Fe 73.20%和pH 7.3不曝气;无味，硝酸盐48.37% Mn 60.91%， Fe 61.20
{"title":"PEMANFAATAN SABUT PINANG SEBAGAI KOMBINASI LAPISAN MULTI MEDIA-FILTER SABUT PINANG (LMM-FSP) DI PERUMAHAN VALENSIA MUARO JAMBI DAN UJI KUALITAS AIR BERSIH","authors":"Deliza Deliza","doi":"10.25077/jrk.v12i2.405","DOIUrl":"https://doi.org/10.25077/jrk.v12i2.405","url":null,"abstract":"Air bersih yang langka di perumahan Valencia Muaro Jambi yang masih dihadapi masyarakat, oleh sebab itu peneliti bertujuan untuk membantu masyarakat perumahan valensia muaro jambi untuk mendapatkan air bersih menggunakan Lapisan Multi Media-Filter Sabut Pinang (LMM-FSP). LMM-FSP merupakan suatu metoda pengolahan air dengan memanfaatkan tanah sebagai media utama yang dibentuk seperti balok bata dan disusun secara selang-seling diantara zeolit. Sistem LMM-FSP terbuat dari galon bekas dicuci bersih tinggi 40 cm berdiameter 28 cm, berisikan blok bata (12x7x4) cm campuran tanah vulkanik, arang, sabut pinang, serbuk besi (70 :10 :10: 5)%, lapisan permiable digunakan zeolit (1-3 mm). Sampel berasal dari sumur warga perumahan valencia, muaro jambi kota jambi. Penelitian dilakukan dengan variasi massa sabut pinang, laju alir 5, 10, 15, 20 mL/menit dan dua cara yaitu aerasi dan non aerasi, diperoleh efisiensi proses aerasi laju alir 5 ml/menit yang paling baik untuk menurunkan kadar pH; Bau; Nitrit; Nitrat; kekeruhan; Mn; Fe pada aerasi yaitu pH 7,5 ; Tidak Berbau; Nitrit 60,30 %, Nitrat 59,33%, Mn 70,10 %, Fe 73,20% dan pada non aerasi pH 7,3 ; Tidak Berbau, Nitrit 50,82%, Nitrat 48,37% Mn 60,91%, Fe 61,20 % Dari semua nilai efisiensi penurunan parameter sudah bisa dikatakan menuhi untuk syarat air bersih[1].","PeriodicalId":33366,"journal":{"name":"Jurnal Riset Kimia","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43028268","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 ability of the tropical white-rot fungi and their enzyme to decolorize synthetic dyes was investigated. Production of lignin-modifying enzymes (LMEs) from the three new isolated fungi, namely Trametes hirsuta D7, Ceriporia sp. BIOM 3, and Cymatoderma dendriticum WM01 were observed for 9 days incubation under static condition. The results showed that the LMEs production enhanced in the present of guaiacol. T. hirsuta D7 produced only laccase (Lac), with the highest activity was 22.6 U/L on the 5th-day of the cultivation. At the same time, Ceriporia sp. BIOM 3 and C. dendriticum WM01 secreted both laccases (Lac) with the activities 0.2 U/L and 1.0 U/L, respectively, and manganese peroxidase (MnP) with the activities 0.1 U/L and 1.0 U/L, respectively. Among the fungi, T. hirsuta D7 efficiently degraded 65% Remazol Brilliant Blue–R (RBBR) dye within 72 h using the only laccase. This study shows that laccase may have a major role in synthetic dyes' decolorization process, followed by MnP and LiP.
{"title":"Biodecolorization of Remazol Brilliant Blue–R dye by Tropical White-Rot Fungi and Their Enzymes in The Presence of Guaiacol","authors":"S. Anita, F. Ningsih, D. Yanto","doi":"10.25077/jrk.v12i2.388","DOIUrl":"https://doi.org/10.25077/jrk.v12i2.388","url":null,"abstract":"The ability of the tropical white-rot fungi and their enzyme to decolorize synthetic dyes was investigated. Production of lignin-modifying enzymes (LMEs) from the three new isolated fungi, namely Trametes hirsuta D7, Ceriporia sp. BIOM 3, and Cymatoderma dendriticum WM01 were observed for 9 days incubation under static condition. The results showed that the LMEs production enhanced in the present of guaiacol. T. hirsuta D7 produced only laccase (Lac), with the highest activity was 22.6 U/L on the 5th-day of the cultivation. At the same time, Ceriporia sp. BIOM 3 and C. dendriticum WM01 secreted both laccases (Lac) with the activities 0.2 U/L and 1.0 U/L, respectively, and manganese peroxidase (MnP) with the activities 0.1 U/L and 1.0 U/L, respectively. Among the fungi, T. hirsuta D7 efficiently degraded 65% Remazol Brilliant Blue–R (RBBR) dye within 72 h using the only laccase. This study shows that laccase may have a major role in synthetic dyes' decolorization process, followed by MnP and LiP.","PeriodicalId":33366,"journal":{"name":"Jurnal Riset Kimia","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45654135","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}
Y. Hidayat, K. Nugrahaningtyas, Priska Julia Hendrastuti
The amount of loaded Co-Mo metal on the Y-Zeolite Ultra Stable (USY) was increased by the addition of activated carbon in the pre-impregnation process. USY modification was done by adding activated carbon to USY as much as 10 wt%. The process of adding activated carbon is carried out by three methods, i.e., grinding with sucrose binder (ACU1), without sucrose (ACU2), and conducting by ball milling (ACU3). Wet impregnation method was employed to disperse the Co and Mo, sequentially. Composites were characterized using Fourier Transform Infrared (FTIR), X-ray diffraction (XRD), and surface area analyzer (SAA). Metal dispersions were observed by X-ray fluorescence (XRF). The FTIR suggests an interaction between USY and activated car-bon, while the XRD result indicated the none structural transformation of USY zeolite. The SAA analysis showed an increased total pore radius with the activated carbon addition. The XRF confirmed the increasing of total metals dispersion of 6.25% (ACU1); 5.48%(ACU2); 5.18% (ACU3); compare to USY origin with 3.28% metals loaded.
{"title":"Activated Carbon Addition Methods on the Pre-impregnation Process of Co-Mo in Y-Zeolite Ultra Stable: A Properties Exploration and Enhancement of Metals Loaded","authors":"Y. Hidayat, K. Nugrahaningtyas, Priska Julia Hendrastuti","doi":"10.25077/jrk.v12i2.384","DOIUrl":"https://doi.org/10.25077/jrk.v12i2.384","url":null,"abstract":"The amount of loaded Co-Mo metal on the Y-Zeolite Ultra Stable (USY) was increased by the addition of activated carbon in the pre-impregnation process. USY modification was done by adding activated carbon to USY as much as 10 wt%. The process of adding activated carbon is carried out by three methods, i.e., grinding with sucrose binder (ACU1), without sucrose (ACU2), and conducting by ball milling (ACU3). Wet impregnation method was employed to disperse the Co and Mo, sequentially. Composites were characterized using Fourier Transform Infrared (FTIR), X-ray diffraction (XRD), and surface area analyzer (SAA). Metal dispersions were observed by X-ray fluorescence (XRF). The FTIR suggests an interaction between USY and activated car-bon, while the XRD result indicated the none structural transformation of USY zeolite. The SAA analysis showed an increased total pore radius with the activated carbon addition. The XRF confirmed the increasing of total metals dispersion of 6.25% (ACU1); 5.48%(ACU2); 5.18% (ACU3); compare to USY origin with 3.28% metals loaded.","PeriodicalId":33366,"journal":{"name":"Jurnal Riset Kimia","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44746742","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}
Morina Adfa, Munifilia Ekasari, Avidlyandi Avidlyandi, Rochmah Supriati, S. Yudha S
Pacar air (Impatiens balsamina L.) plant belongs to the Balsaminaceae family and is used as an indigenous medicine in Asia for fingernail inflammation, fractures, and rheumatism treatments. Moreover, the antipruritic, antianaphylactic, antifungal, antibacterial, and antitumor activities of some compounds, especially phenolics and quinones from this plant have been studied extensively. Therefore, this study aims to determine the antifungal activity of Pacar air leaves (Impatiens balsamina L.) methanol extract against Rhizopus oryzae L. and the IC50 value. The results showed that an increase in the concentrations of I. balsamina L. leaves methanol extract significantly raised the fungal growth. Furthermore, the extract inhibition against R. oryzae L. at various concentrations of 0.5; 0.7; 0.9; 1.1; and 1.3% w/v were 10, 21.9, 58.06, 68.06, and 79.72%, respectively, while the IC50 value was 0.896%. Hence, the presence of naphthoquinones and other secondary metabolites are responsible for its antifungal activity. Based on these results, the antifungal potential of I. balsamina L. leaves against soft-rot fungi is useful in the future.
{"title":"Potensi Daun Pacar Air (Impatiens balsamina L.) dalam Menghambat Pertumbuhan Jamur Rhizopus oryzae L.","authors":"Morina Adfa, Munifilia Ekasari, Avidlyandi Avidlyandi, Rochmah Supriati, S. Yudha S","doi":"10.25077/jrk.v12i2.404","DOIUrl":"https://doi.org/10.25077/jrk.v12i2.404","url":null,"abstract":"Pacar air (Impatiens balsamina L.) plant belongs to the Balsaminaceae family and is used as an indigenous medicine in Asia for fingernail inflammation, fractures, and rheumatism treatments. Moreover, the antipruritic, antianaphylactic, antifungal, antibacterial, and antitumor activities of some compounds, especially phenolics and quinones from this plant have been studied extensively. Therefore, this study aims to determine the antifungal activity of Pacar air leaves (Impatiens balsamina L.) methanol extract against Rhizopus oryzae L. and the IC50 value. The results showed that an increase in the concentrations of I. balsamina L. leaves methanol extract significantly raised the fungal growth. Furthermore, the extract inhibition against R. oryzae L. at various concentrations of 0.5; 0.7; 0.9; 1.1; and 1.3% w/v were 10, 21.9, 58.06, 68.06, and 79.72%, respectively, while the IC50 value was 0.896%. Hence, the presence of naphthoquinones and other secondary metabolites are responsible for its antifungal activity. Based on these results, the antifungal potential of I. balsamina L. leaves against soft-rot fungi is useful in the future.","PeriodicalId":33366,"journal":{"name":"Jurnal Riset Kimia","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42938730","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}
Christine Dyta Nugraeni, L. Atmaja, Nur Hayati, M. Purwanto, M. Santoso, Yuli Kusumawati
Modified chitosan membrane is one of the promising membranes for polymer electrolyte membrane. Chitosan/N-phthaloyl chitosan composite membranes were fabricated to obtain high proton conductivity and low methanol permeability. Membranes were fabricated by casting method and solvent evaporation. Surface morphology, mechanical analysis, methanol permeability, and proton conductivity were used to characterize the overall properties. FT-IR spectra exhibited the presence of interaction of chitosan and n-phthaloyl/chitosan. SEM analysis showed that the surface roughness of composite membrane increases as the n-phthaloyl loading increases. The highest proton conductivity of synthesized membrane is at 2.4 mS.cm-1 and is higher than pristine chitosan membrane at 1.6 mS.cm-1. Moreover, with n-phthaloyl/chitosan addition, the methanol permeability was also improved. The correlation between proton conductivity and methanol permeability in composite membranes suggests that the blend has its potential in DMFC application.
改性壳聚糖膜是一种很有前途的聚合物电解质膜。制备了壳聚糖/ n -邻苯甲酰壳聚糖复合膜，获得了高质子导电性和低甲醇渗透率。采用铸造法和溶剂蒸发法制备膜。表面形貌、力学分析、甲醇渗透率和质子电导率被用来表征其整体性能。红外光谱显示壳聚糖与n-邻苯甲酰/壳聚糖存在相互作用。SEM分析表明，复合膜的表面粗糙度随着n-邻苯二甲酰负载的增加而增加。合成膜的最高质子电导率为2.4 mS.cm-1，高于原始壳聚糖膜的1.6 mS.cm-1。此外，n-邻苯甲酰/壳聚糖的加入也提高了甲醇的渗透性。复合膜中质子电导率与甲醇渗透性的相关性表明，该共混物在DMFC中具有应用潜力。
{"title":"Fabrication and Characterization of Chitosan/N-Phthaloyl Composite Membrane for DMFC Application","authors":"Christine Dyta Nugraeni, L. Atmaja, Nur Hayati, M. Purwanto, M. Santoso, Yuli Kusumawati","doi":"10.25077/jrk.v12i2.408","DOIUrl":"https://doi.org/10.25077/jrk.v12i2.408","url":null,"abstract":"Modified chitosan membrane is one of the promising membranes for polymer electrolyte membrane. Chitosan/N-phthaloyl chitosan composite membranes were fabricated to obtain high proton conductivity and low methanol permeability. Membranes were fabricated by casting method and solvent evaporation. Surface morphology, mechanical analysis, methanol permeability, and proton conductivity were used to characterize the overall properties. FT-IR spectra exhibited the presence of interaction of chitosan and n-phthaloyl/chitosan. SEM analysis showed that the surface roughness of composite membrane increases as the n-phthaloyl loading increases. The highest proton conductivity of synthesized membrane is at 2.4 mS.cm-1 and is higher than pristine chitosan membrane at 1.6 mS.cm-1. Moreover, with n-phthaloyl/chitosan addition, the methanol permeability was also improved. The correlation between proton conductivity and methanol permeability in composite membranes suggests that the blend has its potential in DMFC application.","PeriodicalId":33366,"journal":{"name":"Jurnal Riset Kimia","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46393580","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}
Processing of wasted cooking oil uses the photocatalyst method with metal catalysts and zeolites to reduce organic compounds. In this study, researchers used activated charcoal from durian skin and titanium dioxide embedded in a polyamide membrane as an adsorbent which was used as a medium for processing wasted cooking oil. The purpose of this study was to determine the effect of processing used cooking oil using a membrane of polyamide/titanium dioxide/durian peels activated charcoal on changes in the characteristics of wasted cooking oil. Based on the results of research on the processing of wasted cooking oil with a membrane of polyamide/titanium dioxide/activated charcoal from durian peels, there was an increase in water content by 10.21%, a decrease in free fatty acids by 33.75%, a decrease in the peroxide number by 18.33%. Used cooking oil that has passed through the membrane has a decrease in %Transmission for the functional groups of C-H alkenes, C-O esters, and C-H alkanes. In the analysis of the compound content by mass spectrophotometry, it was found that the content of the methyl ester compound with the C17 and C19 chains was close to the composition of the biodiesel constituents.
{"title":"Pengolahan Minyak Jelantah Menggunakan Membran Poliamida/Titanium Dioksida/Arang Aktif Kulit Durian","authors":"Rika Endara Safitri, Ria Sheftiana Rusli Hayaati","doi":"10.25077/jrk.v12i2.410","DOIUrl":"https://doi.org/10.25077/jrk.v12i2.410","url":null,"abstract":"Processing of wasted cooking oil uses the photocatalyst method with metal catalysts and zeolites to reduce organic compounds. In this study, researchers used activated charcoal from durian skin and titanium dioxide embedded in a polyamide membrane as an adsorbent which was used as a medium for processing wasted cooking oil. The purpose of this study was to determine the effect of processing used cooking oil using a membrane of polyamide/titanium dioxide/durian peels activated charcoal on changes in the characteristics of wasted cooking oil. Based on the results of research on the processing of wasted cooking oil with a membrane of polyamide/titanium dioxide/activated charcoal from durian peels, there was an increase in water content by 10.21%, a decrease in free fatty acids by 33.75%, a decrease in the peroxide number by 18.33%. Used cooking oil that has passed through the membrane has a decrease in %Transmission for the functional groups of C-H alkenes, C-O esters, and C-H alkanes. In the analysis of the compound content by mass spectrophotometry, it was found that the content of the methyl ester compound with the C17 and C19 chains was close to the composition of the biodiesel constituents.","PeriodicalId":33366,"journal":{"name":"Jurnal Riset Kimia","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46953446","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}
Irdhawati Irdhawati, Ni Kadak Nevi Titasia, E. Sahara
In this study, the measurement of Cd(II) ion by anodic stripping voltammetry technique was conducted using bentonite modified carbon paste as working electrode (CPE-B). The performance of CPE-B was compared with carbon paste electrode without bentonite (CPE) and applied for determination of Cd(II) concentration in chicory. Optimized parameters were composition of bentonite in carbon paste electrode, deposition time, deposition potential, and scan rate. Validation of measurements was observed including determination of linear concentration range, detection and quantization limits, repeatability of measurement, and percentage of recovery. The optimum composition of bentonite in CPE-B was found at 50%. Furthermore, in the optimization of measurements condition was found the optimum deposition times were 90 and 60 s, deposition potentials were -0.63 and -0.53 V, and scan rates were 15 and 20 mV/s, for CPE and CPE-B. The linear range concentration for CPE observed at 25-2000 µg/L and CPE-B was 5-50 µg/L. Limit of detection and quantization using CPE-B were 0.337 µg/L and 0.349 µg/L, lower than CPE i.e., 0.470 µg/L and 0.471 µg/L, respectively. Repeatability measurement of Cd(II) had Horwitz Ratio value less than two, and percentage of recovery was 96.73 8.33%. The level of Cd(II) ion in chicory was found at 6.98 0.40 mg/kg.
{"title":"Voltametri Pelucutan Anodik Menggunakan Elektroda Pasta Karbon Termodifikasi Bentonit untuk Penentuan Kadar Ion Cd(II) dalam Sayur Sawi Putih","authors":"Irdhawati Irdhawati, Ni Kadak Nevi Titasia, E. Sahara","doi":"10.25077/jrk.v12i2.417","DOIUrl":"https://doi.org/10.25077/jrk.v12i2.417","url":null,"abstract":"In this study, the measurement of Cd(II) ion by anodic stripping voltammetry technique was conducted using bentonite modified carbon paste as working electrode (CPE-B). The performance of CPE-B was compared with carbon paste electrode without bentonite (CPE) and applied for determination of Cd(II) concentration in chicory. Optimized parameters were composition of bentonite in carbon paste electrode, deposition time, deposition potential, and scan rate. Validation of measurements was observed including determination of linear concentration range, detection and quantization limits, repeatability of measurement, and percentage of recovery. The optimum composition of bentonite in CPE-B was found at 50%. Furthermore, in the optimization of measurements condition was found the optimum deposition times were 90 and 60 s, deposition potentials were -0.63 and -0.53 V, and scan rates were 15 and 20 mV/s, for CPE and CPE-B. The linear range concentration for CPE observed at 25-2000 µg/L and CPE-B was 5-50 µg/L. Limit of detection and quantization using CPE-B were 0.337 µg/L and 0.349 µg/L, lower than CPE i.e., 0.470 µg/L and 0.471 µg/L, respectively. Repeatability measurement of Cd(II) had Horwitz Ratio value less than two, and percentage of recovery was 96.73 8.33%. The level of Cd(II) ion in chicory was found at 6.98 0.40 mg/kg.","PeriodicalId":33366,"journal":{"name":"Jurnal Riset Kimia","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49334240","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}
Azimatur Rahmi, Tika Afriani, Linda Hevira, Wike Widiawati
The aim of this study is to investigate antioxidant activity and total phenolic content of ethyl acetate fraction of Sembung leaves. Sembung (Blumea balsamifera L.) is a plant that has the potential as an antioxidant because it contains secondary metabolites of alkaloids, steroids, flavonoids, saponins, and phenolic compounds. In this study, antioxidant activity was tested by using 1,1-diphenyl-2-picrylhydrazyl (DPPH) for free radical scavenging activity assay. Evaluation of total phenolic content was tested by using the Folin-Ciocalteau method. The results showed that the ethyl acetate fraction of Sembung leaves possess showed medium antioxidant activity with IC50 valueof 221.821 compare with reference standard ascorbic acid with IC50 value 68.25 ppm. The ethyl acetate fraction of Sembung leaves has a total phenolic content of 161.101 mg GAE/g. This study provided that Blumea balsamifera leaves possess antioxidant.
{"title":"Uji Aktivitas Antioksidan dan Fenolik Total Fraksi Etil Asetat Daun Sembung (Blumea balsamifera (L.) DC)","authors":"Azimatur Rahmi, Tika Afriani, Linda Hevira, Wike Widiawati","doi":"10.25077/jrk.v12i2.383","DOIUrl":"https://doi.org/10.25077/jrk.v12i2.383","url":null,"abstract":"The aim of this study is to investigate antioxidant activity and total phenolic content of ethyl acetate fraction of Sembung leaves. Sembung (Blumea balsamifera L.) is a plant that has the potential as an antioxidant because it contains secondary metabolites of alkaloids, steroids, flavonoids, saponins, and phenolic compounds. In this study, antioxidant activity was tested by using 1,1-diphenyl-2-picrylhydrazyl (DPPH) for free radical scavenging activity assay. Evaluation of total phenolic content was tested by using the Folin-Ciocalteau method. The results showed that the ethyl acetate fraction of Sembung leaves possess showed medium antioxidant activity with IC50 valueof 221.821 compare with reference standard ascorbic acid with IC50 value 68.25 ppm. The ethyl acetate fraction of Sembung leaves has a total phenolic content of 161.101 mg GAE/g. This study provided that Blumea balsamifera leaves possess antioxidant.","PeriodicalId":33366,"journal":{"name":"Jurnal Riset Kimia","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47320716","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}
Sabun cair mengandung trigliserida yang mampu mengemulsikan air, kotoran/minyak dan biasanya memberikan aroma yang enak dicium serta dapat melindungi kulit dari bakteri dengan penambahan bahan alami yang aman bagi kesehatan. Penelitian ini bertujuan untuk membuat formulasi sabun cair dengan ekstrak daun jeruk purut (Citrus hystrix dan kopi robusta (Coffea canephora) serta pengujiannya terhadap cemaran mikroba. Tahap pertama membuat ekstrak daun jeruk purut dan kopi robusta dengan pelarut alkohol. Hasil ekstrak daun jeruk purut diperoleh sebanyak 37,84% sedangkan kopi robusta sebanyak 51,64%. Hasil ekstrak ditambahkan ke dalam formulasi sabun cair dengan konsentrasi 2% dan 4%. Formulasi sabun cair dibuat dengan 4 formulasi yaitu F1 ekstrak daun jeruk purut 2%, F2 ekstrak daun jeruk purut 4%, F3 ekstrak kopi robusta 2% dan F4 kopi robusta 4%. Hasil penelitian ini menunjukan formulasi sabun cair memenuhi spesifikasi SNI 06-4085-1996. Hasil viskositas yang paling tinggi diperoleh pada F3 sedangkan yang paling rendah pada F4 pada hari ke-1. Hasil bobot jenis diperoleh sekitar 1,01 – 1,05. Hasil pengujian pH yang paling tinggi pada F3 dengan densitas 1,05. Pengujian stabilitas busa memiliki konsentrasi 70 – 98%, dengan konsentrasi yang paling tinggi F1 adalah 91%, sedangkan yang paling rendah F4 adalah 76,92%. Sedangkan pada pengujian panelis, diperoleh warna yang disukai F1, bau yang disukai F3, bentuk yang disukai F1, busa yang disukai F4. Dengan hasil secara keseluruhan yang disukai oleh panelis adalah sabun cair F1 dengan uji cemaran bakteri F1-F4 menunjukkan tidak adanya pertumbuhan bakteri.
{"title":"FORMULASI DAN EVALUASI SEDIAAN SABUN CAIR DARI EKSTRAK DAUN JERUK PURUT (Citrus hystrix) DAN KOPI ROBUSTA (Coffea canephora) SERTA UJI CEMARAN MIKROBA","authors":"L. Rosmainar","doi":"10.20473/jkr.v6i1.25554","DOIUrl":"https://doi.org/10.20473/jkr.v6i1.25554","url":null,"abstract":"Sabun cair mengandung trigliserida yang mampu mengemulsikan air, kotoran/minyak dan biasanya memberikan aroma yang enak dicium serta dapat melindungi kulit dari bakteri dengan penambahan bahan alami yang aman bagi kesehatan. Penelitian ini bertujuan untuk membuat formulasi sabun cair dengan ekstrak daun jeruk purut (Citrus hystrix dan kopi robusta (Coffea canephora) serta pengujiannya terhadap cemaran mikroba. Tahap pertama membuat ekstrak daun jeruk purut dan kopi robusta dengan pelarut alkohol. Hasil ekstrak daun jeruk purut diperoleh sebanyak 37,84% sedangkan kopi robusta sebanyak 51,64%. Hasil ekstrak ditambahkan ke dalam formulasi sabun cair dengan konsentrasi 2% dan 4%. Formulasi sabun cair dibuat dengan 4 formulasi yaitu F1 ekstrak daun jeruk purut 2%, F2 ekstrak daun jeruk purut 4%, F3 ekstrak kopi robusta 2% dan F4 kopi robusta 4%. Hasil penelitian ini menunjukan formulasi sabun cair memenuhi spesifikasi SNI 06-4085-1996. Hasil viskositas yang paling tinggi diperoleh pada F3 sedangkan yang paling rendah pada F4 pada hari ke-1. Hasil bobot jenis diperoleh sekitar 1,01 – 1,05. Hasil pengujian pH yang paling tinggi pada F3 dengan densitas 1,05. Pengujian stabilitas busa memiliki konsentrasi 70 – 98%, dengan konsentrasi yang paling tinggi F1 adalah 91%, sedangkan yang paling rendah F4 adalah 76,92%. Sedangkan pada pengujian panelis, diperoleh warna yang disukai F1, bau yang disukai F3, bentuk yang disukai F1, busa yang disukai F4. Dengan hasil secara keseluruhan yang disukai oleh panelis adalah sabun cair F1 dengan uji cemaran bakteri F1-F4 menunjukkan tidak adanya pertumbuhan bakteri.","PeriodicalId":33366,"journal":{"name":"Jurnal Riset Kimia","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73841756","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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