Jurnal Akademika Kimia最新文献_第9页

Development of Hollow Fiber Liquid Phase Microextraction Method for Determination of Diazinon Residues in Vegetable Samples 中空纤维液相微萃取法测定蔬菜样品中二嗪农残留量的建立

Jurnal Akademika Kimia Pub Date : 2022-02-28 DOI: 10.22487/j24775185.2022.v11.i1.pp6-13

E. R. Amanda, Y. Raharjo, U. S. Handajani

{"title":"Development of Hollow Fiber Liquid Phase Microextraction Method for Determination of Diazinon Residues in Vegetable Samples","authors":"E. R. Amanda, Y. Raharjo, U. S. Handajani","doi":"10.22487/j24775185.2022.v11.i1.pp6-13","DOIUrl":"https://doi.org/10.22487/j24775185.2022.v11.i1.pp6-13","url":null,"abstract":"An extraction method based on a combination of hollow fiber liquid-phase microextraction with high-performance liquid chromatography diode array detector (HF-LPME HPLC-DAD) has been developed and demonstrated to analyze pesticide residues in vegetables. This study aims to determine the optimum extraction conditions and validation performance of this method. Diazinon pesticide was selected as the target model analyte. HF-LPME is performed by stacking microliter organic solvent droplets through an HPLC syringe coated with polypropylene hollow fiber by directly dipping it into the sample solution and stirring it during the extraction process. Finally, the organic solvent was put into an HPLC syringe at the end of the extraction. Then, it was injected into the HPLC-DAD at the wavelength of 247 nm. Several important extraction parameters have been optimized. The optimization results showed the type of organic solvent of n-hexane, the length of the hollow fiber of 1.5 cm, the volume of the sample solution of 20 mL, and the stirring speed of 600 rpm. The validation performance obtained a limit of detection (LoD) of 0.10 mgL-1, limit of quantification (LoQ) of 0.33 mgL-1, percent recoveries of 99.88%, a coefficient of variation of 3% (n=15), and the enrichment factor of 19,982 times. Under optimal conditions, the developed method was applied to extract diazinon in vegetable matrix samples using the spiking method. Mustard green was selected as a model matrix sample. From the research, the percentage recoveries of diazinon obtained in the mustard green matrix sample are 98.80% - 100.41%.","PeriodicalId":17695,"journal":{"name":"Jurnal Akademika Kimia","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84632330","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

Application of CORE Learning Model with Molymod-Assisted on Hydrocarbon Material to Improve the Students’ Learning Outcomes 应用molymod辅助碳氢材料CORE学习模式提高学生学习效果

Jurnal Akademika Kimia Pub Date : 2022-02-28 DOI: 10.22487/j24775185.2022.v11.i1.pp26-30

Gleryl F. Novemly, M. Napitupulu, Ijirana Ijirana

引用次数: 0

Analysis of Student’s Creative Thinking Ability on Colloid Material 学生对胶体材料的创造性思维能力分析

Jurnal Akademika Kimia Pub Date : 2022-02-28 DOI: 10.22487/j24775185.2022.v11.i1.pp1-5

Siti Arma, S. Supriadi

引用次数: 0

The Effect of Surfactants on Separation of Light Rare Earth Metals using Emulsion Liquid Membrane Method: Review 表面活性剂对乳状液膜法分离轻稀土金属的影响

Jurnal Akademika Kimia Pub Date : 2022-02-28 DOI: 10.22487/j24775185.2022.v11.i1.pp46-55

Dwi Ratna Setiani, Afifah R. Widianti, Fauzia Salsabila, A. Anggraeni, H. Bahti, U. Pratomo

{"title":"The Effect of Surfactants on Separation of Light Rare Earth Metals using Emulsion Liquid Membrane Method: Review","authors":"Dwi Ratna Setiani, Afifah R. Widianti, Fauzia Salsabila, A. Anggraeni, H. Bahti, U. Pratomo","doi":"10.22487/j24775185.2022.v11.i1.pp46-55","DOIUrl":"https://doi.org/10.22487/j24775185.2022.v11.i1.pp46-55","url":null,"abstract":"Rare earth metals (REM) are scarce elements and are only found in the form of complex compounds of phosphate and carbonate. REM consists of 17 elements classified into light REM, medium REM, and heavy REM. This article is focused on lightweight REM, which is widely applied in various industrial fields. Many REM applications are increasing the demand for high-purity and bulk REMs. However, REM has almost the same physical and chemical properties, making it difficult to separate. Therefore, the separation of REM is interesting to study with various methods, one of which is Emulsion Liquid Membrane (ELM). ELM is developing a solvent extraction method involving three phases: the external phase, the internal phase, and the membrane phase. The key to the success of ELM lies in the stability of the emulsion, which is very dependent on the type and concentration of surfactants, so in the ELM process, it is necessary to choose the right concentration and type of surfactant. Therefore, this article was made to know the effect of surfactants such as span-80, span-85, and T154 in separating light REM using the ELM method.","PeriodicalId":17695,"journal":{"name":"Jurnal Akademika Kimia","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84100968","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 Compounds of the Catechin from Wungu (Graptophyllum pictum (L.) Griff) Leaves and the Sun Protecting Factor Value 云姑(Graptophyllum pictum, L.)中儿茶素类黄酮化合物的研究格里夫)树叶和防晒因子值

Jurnal Akademika Kimia Pub Date : 2022-02-28 DOI: 10.22487/j24775185.2022.v11.i1.pp31-38

Masyita Masyita, Endah Sayekti, N. Nurlina

{"title":"Flavonoid Compounds of the Catechin from Wungu (Graptophyllum pictum (L.) Griff) Leaves and the Sun Protecting Factor Value","authors":"Masyita Masyita, Endah Sayekti, N. Nurlina","doi":"10.22487/j24775185.2022.v11.i1.pp31-38","DOIUrl":"https://doi.org/10.22487/j24775185.2022.v11.i1.pp31-38","url":null,"abstract":"The flavonoid content in wungu (Graptophyllum pictum (L.) Griff.) leaves has the potential as a sunscreen. The study aims to identify isolates of flavonoid compounds from wungu leaves and determine the SPF value. Steps are followed by extraction, fractionation, phytochemical test, separation by chromatography, identification, and SPF test. Extraction was carried out with methanol, followed by fractionation with n-hexane and dichloromethane. Dichloromethane fraction was chosen to proceed to the separation step because the results of the phytochemical test showed a vigorous color intensity for the content of flavonoids. The isolate (3.6 mg; dark green; amorphous; mp. 132-136 °C) was identified using a UV-Vis spectrophotometer using methanol as a solvent with a shift reagent NaOH, AlCl3, and a mixture of concentrated AlCl3 and HCl. Based on the UV-Vis spectra, the isolate was predicted to be flavonoid compounds belonging to the catechin group, which have a hydroxyl group at positions C-3, C-7, and do not have an ortho-hydroxy group in ring B. The SPF value of the isolate of 2.3244 at 100 ppm was determined in vitro and calculated by the Qian equation. Therefore, isolate was categorized as sunscreens that provided minimal protection","PeriodicalId":17695,"journal":{"name":"Jurnal Akademika Kimia","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74787400","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: 3

Application of Cooperative Learning Jigsaw Model to Improve Student's Learning Achievement in Chemistry Learning 合作学习拼图模式在化学学习中提高学生学习成绩的应用

Jurnal Akademika Kimia Pub Date : 2022-02-28 DOI: 10.22487/j24775185.2022.v11.i1.pp39-45

Sitti Rahmawati, Detris Poba, M. Magfirah, Kusrini Burase

{"title":"Application of Cooperative Learning Jigsaw Model to Improve Student's Learning Achievement in Chemistry Learning","authors":"Sitti Rahmawati, Detris Poba, M. Magfirah, Kusrini Burase","doi":"10.22487/j24775185.2022.v11.i1.pp39-45","DOIUrl":"https://doi.org/10.22487/j24775185.2022.v11.i1.pp39-45","url":null,"abstract":"This study aims to improve student achievement in learning chemistry in class X MIA4 at SMA Negeri 1 Palu by applying the Jigsaw Cooperative Learning Model. The Classroom Action Research (CAR) problem can be formulated as follows: Is the Jigsaw Cooperative Learning Model application able to improve student achievement in learning chemistry in class X MIA4 SMAN 1 Palu? CAR is carried out with the following stages to answer the problem: 1. Planning, 2. Implementation. 3. Observation, and 4. Evaluation and Reflection. The study results can be explained as follows several fundamental aspects of learning were successfully improved by applying the Jigsaw Cooperative Learning Model. Such as student activity in collaboration and in completing worksheets independently, actively asking and answering questions, and making students feel happy and enthusiastic. Likewise, the average evaluation of each cycle showed that the % completeness increased. In cycle one, action one was 73.8%, action two 85.5%, and activity three 92.9% increased in cycle two, the average from three actions to 98.0%. It can be concluded that the application of the Jigsaw Cooperative Learning Model can improve student achievement in class X MIA4 SMA Negeri 1.","PeriodicalId":17695,"journal":{"name":"Jurnal Akademika Kimia","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82267853","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

Antioxidant Activity Test of Ethanol Extract of Ripe and Young Cocoa Pods (Theobroma Cacao L.) 成熟和幼可可荚乙醇提取物的抗氧化活性试验

Jurnal Akademika Kimia Pub Date : 2022-02-28 DOI: 10.22487/j24775185.2022.v11.i1.pp64-71

Andriana Andriana, M. R. Jura

引用次数: 2

Determination of Iron (Fe), Zinc (Zn) Levels and Organoleptic Tests in Coconut Pulp Flour 椰子浆粉中铁(Fe)、锌(Zn)含量的测定和感官试验

Jurnal Akademika Kimia Pub Date : 2021-11-30 DOI: 10.22487/j24775185.2021.v10.i4.pp269-276

Muh. F. Khaykal, Sri H. V. Pulukadang

引用次数: 0

Co-pigmentation of Anthocyanin Jamblang Fruit (Syzygium cumini) with Acetic Acid and Alum 混香果花青素与醋酸和明矾的共着色研究

Jurnal Akademika Kimia Pub Date : 2021-11-30 DOI: 10.22487/j24775185.2021.v10.i4.pp237-246

Chintia N. Barani, S. Nuryanti, P. H. Abram

{"title":"Co-pigmentation of Anthocyanin Jamblang Fruit (Syzygium cumini) with Acetic Acid and Alum","authors":"Chintia N. Barani, S. Nuryanti, P. H. Abram","doi":"10.22487/j24775185.2021.v10.i4.pp237-246","DOIUrl":"https://doi.org/10.22487/j24775185.2021.v10.i4.pp237-246","url":null,"abstract":"This study aimed to determine the effect of temperature on the stability of anthocyanin jamblang after co-pigmentation with acetic acid and alum. The extraction of Jamblang fruit used the maceration method with n-hexane, ethyl acetate, and ethanol-HCl 0.5% solvents. The total anthocyanin obtained was 70.64 mg/L. Anthocyanin of jamblang fruit was co-pigmented with acetic acid and alum in a concentration of 2.5%; 5%; 7.5%; and 10%, then be heated at various temperatures and heating times. At a temperature of 80 ℃ for 150 minutes, every 30 minutes, absorbance was measured. At a temperature of 60 ℃, the heating was carried out for 225 minutes, and every 45 minutes, absorbance was measured. At a temperature of 40 ℃, the heating was carried out for 300 minutes, and every 60 minutes, absorbance was measured. Absorbance measurements were taken using a UV-VIS spectrophotometer. The results showed that co-pigmentation of anthocyanin occurred proved by shifting λ max from 470 nm (unco-pigmented extract) to 500 nm (co-pigmented extract acetic acid) and 540 nm (co-pigmented extract alum). Acetic acid and alum co-pigments maintained the stability of anthocyanin jamblang at a heating temperature of 60 ℃. It can be seen from decreased absorbance, which is not so significant compared to the decrease at temperatures of 40 and 80 ℃, accompanied by anthocyanin's fading color, which is co-pigmented with acetic acid and alum during the heating process.","PeriodicalId":17695,"journal":{"name":"Jurnal Akademika Kimia","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79610070","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

Development of Nanocomposite Films with Durian Peel Nanocrystalline Cellulose 榴莲皮纳米纤维素纳米复合膜的研制

Jurnal Akademika Kimia Pub Date : 2021-11-30 DOI: 10.22487/j24775185.2021.v10.i4.pp230-236

Zeinur Rochma Fandis Romadhon, I. G. Made Sanjaya

引用次数: 0