Jurnal Kimia Valensi最新文献_第3页

Use of CoO/ZnAl2O4 Catalysts and Microwaved Assisted in Vanillin Synthesis 用CoO/ZnAl2O4催化剂和微波辅助合成香兰素

Jurnal Kimia Valensi Pub Date : 2023-06-01 DOI: 10.15408/jkv.v9i1.29727

Damiana Nofita Birhi, E. Iftitah, W. Warsito

{"title":"Use of CoO/ZnAl2O4 Catalysts and Microwaved Assisted in Vanillin Synthesis","authors":"Damiana Nofita Birhi, E. Iftitah, W. Warsito","doi":"10.15408/jkv.v9i1.29727","DOIUrl":"https://doi.org/10.15408/jkv.v9i1.29727","url":null,"abstract":"Vanillin is a main component in vanilla, which is widely used in the industrial world. Market demand for vanillin extract continues to increase, while the availability of vanilla pods is decreasing. To overcome this problem, research on the synthesis of vanillin continues to be carried out and develops every year. This research aims to examine the conversion level and selectivity of the catalyst as well as microwave radiation efficiency usage in vanillin synthesis. Catalyst CoO/ZnAl2O4 was synthesized from CoO and ZnAl2O4 using the impregnation method, then analyzed using FTIR, XRD, and SEM-EDX. Vanillin synthesis was conducted in two steps, incorporating microwave usage at 120oC, underwent 30 minutes to be completed then followed by oxidation around 10- and 15-minutes involving nitrobenzene also 1%, 4%, and 7% of catalysts CoO/ZnAl2O4. The result showed that during 10 and 15 minutes, the selectivity value and various yield percentages for each time variation and catalyst loading of vanillin had been successfully 100% converted. The best result was obtained using CoO/ZnAl2O4 with 4% catalyst loading for 15 minutes. The selectivity value and yield percentages were 67.78% and 7.5%. A one-step vanillin synthesis with conventional reflux could also be a comparison. The reactions were done at 130oC for 2 and 3 hours with 4% catalyst loading.","PeriodicalId":17786,"journal":{"name":"Jurnal Kimia Valensi","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42396617","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}

引用次数: 0

The Potency of Alkaloid Derivates as Anti-Breast Cancer Candidates: In Silico Study 生物碱衍生物作为抗乳腺癌症候选药物的潜力：在Silico研究中

Jurnal Kimia Valensi Pub Date : 2023-05-31 DOI: 10.15408/jkv.v9i1.31481

Sedin Renadi, A. Pratita, R. Mardianingrum, R. Ruswanto

引用次数: 0

Box-Behnken Experimental Design for Electrochemical Aptasensor Optimization on Screen Printed Carbon Electrode/Silica-Ceria 丝网印刷碳电极/二氧化硅-二氧化铈电化学感应传感器优化的Box-Behnken实验设计

Jurnal Kimia Valensi Pub Date : 2023-05-31 DOI: 10.15408/jkv.v9i1.27493

Salma Nur Zakiyyah, D. Eddy, M. L. Firdaus, T. Subroto, Y. Hartati

{"title":"Box-Behnken Experimental Design for Electrochemical Aptasensor Optimization on Screen Printed Carbon Electrode/Silica-Ceria","authors":"Salma Nur Zakiyyah, D. Eddy, M. L. Firdaus, T. Subroto, Y. Hartati","doi":"10.15408/jkv.v9i1.27493","DOIUrl":"https://doi.org/10.15408/jkv.v9i1.27493","url":null,"abstract":"This study aims to optimize the epithelial sodium channel (ENaC) electrochemical aptasensor with the Box-Behnken experimental design. ENaC is a protein that plays a role in sodium ion transport in several epithelial tissues and is associated with hypertension. The ENaC protein aptamer is held in place in the electrochemical aptasensor by a modified screen-printed carbon electrode (SPCE) of silica-ceria composite (SiO2-CeO2). The unique structure of a silica matrix with high biocompatibility can form composites through a hydrothermal process. The Box-Behnken (BBD) experimental design is an efficient optimization method of factors that affect the experiment at three levels. The FTIR results of the silica-ceria composites were 549.35 cm-1 (Ce-O), 1095.3 cm-1 (Si-O-Si), and 491.28 cm-1 (Si-O). Meanwhile, SPCE/silica-ceria characterized by differential pulse voltammetry (DPV) showed an increase in peak current [Fe(CN)6]3-/4- from 3.190 μA to 9.073 μA. Three experimental factors, aptamer concentration, streptavidin incubation time, and aptamer incubation time, were optimized with BBD and obtained at 0.5 μg.mL-1, 30 minutes, and 1 hour. The optimum conditions observed resulted in a selective current response for ENaC protein detection. The optimization results can be applied to aptamer-based ENaC protein detection in samples.","PeriodicalId":17786,"journal":{"name":"Jurnal Kimia Valensi","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41855598","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}

引用次数: 0

Flavonoid Concentration and Tyrosinase Inhibition Activity of Ethanol Extract of Piper crocatum (Piper crocatum var. Ruiz & Pav) from Various Regions in Indonesia and Their Correlations 印尼不同地区番红花乙醇提取物中黄酮含量和酪氨酸酶抑制活性及其相关性

Jurnal Kimia Valensi Pub Date : 2023-05-31 DOI: 10.15408/jkv.v9i1.31426

Riyan Alifbi Putera Irsal, M. Safithri, D. Andrianto, E. Mardliyati

{"title":"Flavonoid Concentration and Tyrosinase Inhibition Activity of Ethanol Extract of Piper crocatum (Piper crocatum var. Ruiz & Pav) from Various Regions in Indonesia and Their Correlations","authors":"Riyan Alifbi Putera Irsal, M. Safithri, D. Andrianto, E. Mardliyati","doi":"10.15408/jkv.v9i1.31426","DOIUrl":"https://doi.org/10.15408/jkv.v9i1.31426","url":null,"abstract":"Hyperpigmentation is a condition of darkening of the skin which is generally caused by an increase in melanin production. Melanin is produced in melanocytes by the enzyme tyrosinase. Piper crocatum contains flavonoid compounds that are known from previous research to inhibit tyrosinase. The goals of this study were to determine the tyrosinase inhibitory activity and total flavonoid content of seven accessions, as well as look at the Pearson’s correlation and clustering PCA (principal component analysis). The method used was water content analysis, extraction yield measurement, total flavonoids analysis, and in vitro tyrosinase inhibition. Based on the results, P. crocatum from Kendari had the best yield and total flavonoid content of 24.07% and 5.10 mg QE g-1, while P. crocatum from Bogor had the lowest water content with a value of 6.21% and the best in tyrosinase inhibition of 13.77. The correlation between total flavonoid content and percent inhibition showed a very weak correlation. The results of clustering formed four clusters of seven accessions based on total flavonoids and percent inhibition. The cluster was divided into Malang (506mDPL) and Jayapura (287mDPL), Banda Aceh (0.80mDPL) and Bandung (670mDPL), Samarinda (8mDPL) and Bogor (190-350m DPL), and Kendari (14mDPL). In conclusion, the correlation between total flavonoid levels and percent inhibition is very weak and regional diversity had a significant effect on total flavonoids and total inhibition.","PeriodicalId":17786,"journal":{"name":"Jurnal Kimia Valensi","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48932458","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}

引用次数: 0

Synthesis of Green Diesel from Palm Oil Using Nickel-based Catalyst: A Review 镍基催化剂合成棕榈油绿色柴油的研究进展

Jurnal Kimia Valensi Pub Date : 2023-05-31 DOI: 10.15408/jkv.v9i1.26488

I. Aziz, P. Sugita, N. Darmawan, A. A. Dwiatmoko

引用次数: 1

Application of PAN/α-Fe2O3-Bentonite as A Photocatalytic Membrane for The Photodegradation of Methylene Blue PAN/α- fe2o3 -膨润土光催化膜在亚甲基蓝光降解中的应用

Jurnal Kimia Valensi Pub Date : 2023-05-31 DOI: 10.15408/jkv.v9i1.28635

Dina Wardani Sitompul, T. Kemala, N. Darmawan

{"title":"Application of PAN/α-Fe2O3-Bentonite as A Photocatalytic Membrane for The Photodegradation of Methylene Blue","authors":"Dina Wardani Sitompul, T. Kemala, N. Darmawan","doi":"10.15408/jkv.v9i1.28635","DOIUrl":"https://doi.org/10.15408/jkv.v9i1.28635","url":null,"abstract":"The intricate molecular structure of the dyes in wastewater makes it difficult to biodegrade, which could harm the environment. Currently, semiconductor-based photocatalytic methods are being developed to remove dyes from water. In this study, the α-Fe2O3-bentonite photocatalyst was synthesized by mechanical milling and immobilized in polyacrylonitrile (PAN) membrane by phase inversion. Analysis of the composition and surface morphology of the synthesized samples was carried out by FTIR, XRD, and EDX. The performance of the photocatalytic membrane was studied by investigating the removal of methylene blue (MB). Photocatalytic membrane with 2% α-Fe2O3-bentonite had the best performance in removing MB (10 ppm) that reached 99.84% at pH 11.5 with an irradiation time of 300 minutes under direct sunlight. The reuse cycle of the photocatalytic membrane was also carried out and the results showed that there is no significant change in the photodegradation efficiency after 3 cycles. Photocatalyst immobilization on PAN membranes is proven to overcome the post-recovery problem of photocatalysts and making easier to reuse. The photocatalyst membrane synthesized in this study can be used as an alternative for removing dyes from water.","PeriodicalId":17786,"journal":{"name":"Jurnal Kimia Valensi","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44364947","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}

引用次数: 0

Synthesis of Iron Oxide (Fe2O3)-Xanthan Gum Nanoparticle Composites Its Potential as a Chemical Flooding Media in Enhanced Oil Recovery (EOR) 氧化铁(Fe2O3)-黄原胶纳米颗粒复合材料的合成及其作为提高采收率化学驱介质的潜力

Jurnal Kimia Valensi Pub Date : 2023-05-31 DOI: 10.15408/jkv.v9i1.29468

Yong Richard Sriwijaya, P. J. Ratri, T. R. Mayangsari, Azis Adharis, S. S. Riswati

{"title":"Synthesis of Iron Oxide (Fe2O3)-Xanthan Gum Nanoparticle Composites Its Potential as a Chemical Flooding Media in Enhanced Oil Recovery (EOR)","authors":"Yong Richard Sriwijaya, P. J. Ratri, T. R. Mayangsari, Azis Adharis, S. S. Riswati","doi":"10.15408/jkv.v9i1.29468","DOIUrl":"https://doi.org/10.15408/jkv.v9i1.29468","url":null,"abstract":"Increasing oil consumption in Indonesia encourages an improvement of production using chemical flooding of Enhanced Oil Recovery (EOR) technology. Chemical flooding is an injection method of materials based on polymer and nanoparticles such as α-Fe2O3-xanthan gum nanocomposite into the reservoir. In this study, α-Fe2O3 nanoparticles were synthesised and then blended to xanthan gum by sonochemical method through an ex-situ process. The α-Fe2O3-xanthan gum nanocomposite X-ray diffraction (XRD) shows that there are no additional peaks. Only the α-Fe2O3 and the xanthan gum peaks are detected with the crystallite size of around 16-20 nm. The particle size of α-Fe2O3-xanthan gum (1:1) nanocomposite as measured by Particle Size Analyzer (PSA) was 228.43 nm with the type of polydisperse. The functional group of the nanocomposite is a combination of the α-Fe2O3 and xanthan gum functional groups which shows there are no other compounds detected in IR spectra. The EOR test showed that xanthan gum had a significant effect on increasing the viscosity of the α-Fe2O3-xanthan gum nanofluid to 1.964 cP at a 1:2 composition. Based on these results, α-Fe2O3-xanthan gum nanofluid is the potential material used in the chemical flooding process in the reservoir.","PeriodicalId":17786,"journal":{"name":"Jurnal Kimia Valensi","volume":"24 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41247381","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}

引用次数: 0

Zeolite from Zirconium-Modified Fly Ash Waste for Absorption of Phosphate Compounds in Waters 锆改性粉煤灰废渣沸石吸附水中磷酸盐的研究

Jurnal Kimia Valensi Pub Date : 2023-05-31 DOI: 10.15408/jkv.v9i1.26951

Mu'izzah Irsyadi Putri, A. Saefumillah, R. Bakri

引用次数: 0

The Potential of Nanocellulose Acetate as Surfactant for Water-Vegetable Oil Systems 纳米醋酸纤维素作为水-植物油体系表面活性剂的潜力

Jurnal Kimia Valensi Pub Date : 2023-05-31 DOI: 10.15408/jkv.v9i1.29467

Ikhsan Ibrahim, M. Ledyastuti

{"title":"The Potential of Nanocellulose Acetate as Surfactant for Water-Vegetable Oil Systems","authors":"Ikhsan Ibrahim, M. Ledyastuti","doi":"10.15408/jkv.v9i1.29467","DOIUrl":"https://doi.org/10.15408/jkv.v9i1.29467","url":null,"abstract":"Indonesia, as an agricultural country, has a variety of abundant plants. Cellulose is a component in plants that can be modified to increase its economic value. Resizing cellulose to nanocellulose and modification of nanocellulose to nanocellulose acetate can increase its potential as a surfactant. Resizing cellulose can be done using the strong acid hydrolysis method. An acetic anhydride reagent was utilized to convert the surface hydroxyl functional group into acetyl. The successful production and modification of nanocellulose were confirmed using fourier transform infrared and particle size analysis characterization. The infrared absorption spectrum of cellulose and nanocellulose showed no difference in peaks. Particle size distribution showed that nanocellulose I (CNC I) and nanocellulose II (CNC II) has sizes of 142 nm and 319 nm, respectively. The property of nanocellulose molecules in an oil-water system was simulated using molecular dynamics with GROMACS 2020.6 software. Appropriate trends can be seen in the interfacial tension of water-vegetable oil systems. The value of interfacial tension decreases with the addition of nanocellulose acetate compared to the addition of nanocellulose. With the agreement between the experimental and computational results, nanocellulose acetate can act as a surfactant.","PeriodicalId":17786,"journal":{"name":"Jurnal Kimia Valensi","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48572036","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}

引用次数: 0

Synthesis and Characterization of Hydroxyapatite from Green Mussel Shell with Sol-Gel Method 溶胶-凝胶法制备青贻贝羟基磷灰石及表征

Jurnal Kimia Valensi Pub Date : 2022-11-30 DOI: 10.15408/jkv.v8i2.27494

Charlena Charlena, A. Maddu, T. Hidayat

引用次数: 0