KOVALEN: Jurnal Riset Kimia
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SINTESIS ETIL LAURAT DARI ASAM LAURAT MENGGUNAKAN KATALIS ASAM SULFAT PEKAT
Get PDFThe aims of these research are to find out the comparison of the ratio of lauric acid molar and ethanol (m/v), the time of mixing and the best catalyst volume to produce lauric ethyl with the highest degree of esterification by using volumetric method. Synthesize of ethyl lauric from lauric acid with ethanol did by using thick sulphate acid p.a as the catalyst with comparison of lauric acid with ratio 1:3, 1:4, 1:5, 1:6, 1:7. The variation of mixing time are 1, 2, 3, 4, 5 hour. The catalyst variation are 1, 2, 3, 4, and 5 mL. This research used random variable in the confidence interval 95%. The result of this research showed that the best molar lauric acid ratio and ethanol is 1: 7 (m/v) and esterification degree is 59,701 %. The best mixing time is 5 hour, and esterification is 53,283%, While catalyst volume variation is 1 mL with esterification degree 87,611 % Keywords : Lauric Acid, Ethyl Lauric, Esterification Degree, Volumetric Metho
PRODUKSI MALTODEKSTRIN DARI TEPUNG SAGU MENGGUNAKAN ENZIM Α-AMILASE
Get PDFThe title of this research is “ the production of maltodextrin of sagoo flour using α-amylaseâ€. The objective of this research is to find out the amount of sagoo flour, enzym and time reaction the produced maltodextrin with the highest dextrosa equivalent. To find the highest dextrosa equivalent, the treatment was vary the weight of sagoo flour, the amount of enzym and time. The variation of sagoo flour weight was 6, 8, 10, 12 and 14 gram. The variation of enzym is 0.1, 0.11, 0.12, 0.13, and 0.14 mL. The variation of time was 70, 80, 90, 120, 150, 180 and 210 minutes. The results of this research showed the best sagoo flour is 8 gr with de amount is 11,835, and the best omount of enzym is 0,14 mL with de amount 21.71, the best time reaction is 120 minutes with de amount is 17.625Keywords: sagoo flour, enzym α-amylase, maltodextri
RETENSI FENOLAT BUBUR INSTAN FUNGSIONAL SELAMA PENYIMPANAN PADA SUHU RUANG
Get PDFFenolat retention of porridge instant functional for storage at room temperature. Has been done this study aims to determine the retention of instant porridge phenolics during storage as well as to determine the shelf life of instant porridge at room temperature. Estimation of shelf life or expiration period using the model of reaction kinetics. The treatment phase of the study include purple sweet potato flour manufacture, processing, instant porridge, instant porridge and storage at room temperature. Analysis of phenolics in instant porridge be done every 7 days for 56 days using UV-Vis spectrophotometry at a wavelength of 765 nm. The data obtained is used to determine the shelf life of instant porridge. The results obtained show the retention levels of phenolics on day 0 was 100% and at day 56 was 27.911% and the expiration of a functional instant porridge is 55 daysKeywords: Phenols, functional porridge, Fenolat Retention, Shelf Life, reaction kinetics mode
PENGGUNAAN ARANG AKTIF KULIT KACANG TANAH (Arachis hypogaea) SEBAGAI ADSORBEN DALAM PRODUKSI KAROTEN DARI FRAKSI OLEIN MINYAK SAWIT KASAR
Get PDFResearch using active charcoal leather peanut (Arachis hypogaea) as adsorbent in carotene production of crude palm oil olein fraction has conducted. This study aims to determine the ratio between active charcoal and olein that can produce the highest carotene shake time for 3 hours. Carotene analysis was conducted using UV-Vis spectrophotometry. The study design is applied is completely randomized design (CRD), with 5 variations adsorbent ratio is 1: 5; 1,5: 5; 2: 5; 2,5: 5; 3: 5 w/v and each stage is repeated twice. Results of this research showed that the ratio of peanut skin adsorbent 2: 5 w/v have the best adsorption weighing carotene obtained at 0,72 mg and percent absorption by the adsorbent reaches 97,3%.Keywords: Peanut Leather, Adsorbents, UV-Vis spectrophotometry, Carotene
KAJIAN KANDUNGAN FENOLAT DAN AKTIVITAS ANTIOKSIDAN EKSTRAK ETANOL TEMPE GEMBUS DARI BERBAGAI WAKTU INKUBASI
Get PDFThe research about study of content phenolic and antioxidant activity extract ethanol tempeh gembus of a variety of incubation has been done. This study aims to know the time of incubation and time extraction that produced levels of the total phenolic and the best antioxidant activity. Determination of total phenolic using the method of folin-ciocalteu and antioxidant activity using the method DPPH. The achievement of goals be done through the application of the treatment of the time of incubation and time extraction of level of phenolic and antioxidant activity. The influence of the time of incubation is applied five levels of 0 hours; 12 hours; 24 hours; 36 hours and 48 hours. While the influence of time extraction is 1 hours, 1.5 hours, 2 hours, 2.5 hours, and 3 hours. From the result obtained by the incubation is at the time of incubation 36 hours which resulted in levels of total phenolic of 7.75 % and the value of IC50 0f 1098.88 µg/mL. The use of time extraction is 1,5 hours that produces levels of total phenolic of 5.26 % and the value of IC50 of 1198.95 µg/mL.Keyword: tempeh gembus, total phenolic, antioxidant activity, time of incubation, time extractio
SINTESIS ABSOLUT ASIMETRIK BARU
Get PDFABSTRACT New absolute asymmetric syntheses have been found. Eugenol based-acetylenes monomers have been synthesized, corresponding three compounds and one unknown compound. Two compounds are crystal chiral (1 and 2) and one (3) not. Polymerization of chiral crystal and not were different although the structure is same. After recrystalization polymerization of 1 and 2 compare with 3 also different. This is one example of new absolute asymmetric synthesis. Keywords : New absolute asymmetric synthesis, eugenol, unknown compound, chiral crystal
ANALISIS PENETAPAN KADAR NIPAGIN DALAM SEDIAAN BODY LOTION TIE (TANPA IZIN EDAR) YANG BEREDAR DI PASAR TRADISIONAL KOTA PALU
Get PDFThis study aims to determine the levels of nipagin as preservative in body lotions which have no marketing authorization (MA). Each sample was taken from 4 traditional markets located in Palu City. The assay of nipagin in the body lotions was done by using ultraviolet (UV) at wavelength of 257 nm. From 8 different samples, 5 of them contain nipagin of which levels are as follows: A1 = 0.232%; A2 = 0.229%; B1 = 0.124%; B2 = 0.120%; C1 = 0.120%; C2 = 0.117%; and D1 = 0.267%; D2 = 0.273%; and F1 = 0.213%; and F2 = 0.215%. Based on the results obtained, those body lotions that have no marketing authorization meet the requirement of nipagin’s preservative levels according to Analitical Method of National Center for Drug and Food Testing, in which the allowed levels of nipagin for body lotion is 0.4%.Keywords: Body Lotion, Nipagin, Ultraviolet Spectrophotometer
HIDROLISIS SELULOSA DARI SEKAM PADI (Oryza sativa) MENJADI GLUKOSA DENGAN KATALIS ARANG TERSULFONASI
Get PDFCellulose hydrolysis from rice husk (Oryza sativa) into glucose with sulfonated charcoal catalyst was conducted. The aim of this research was to determine sulfuric acid concentration and contact time on the sulfonation process of charcoal which would produce the highest glucose rendement from cellulose hydrolysis of rice husk. Sulfuric acid concentrations in this experiment were 8, 10, and 12 N with variation of contact time of 4, 6, 8, 10 and 12 hours respectively. Rice husk was delignified with NaOH 10% to produce cellulose which was hydrolyzed by sulfonated charcoal catalyst. Hydrolysis reaction with the ratio cellulose/aquadest 1:25 (w/v) was conducted in autoclave with temperature 130 oC for 3 hours. The result showed that 8 N concentration of sulfuric acid and 12 hours of contact time produced the highest glucose rendement 17,9%. Keywords : rice husks, cellulose, glucose, sulfonated charcoa
PENGGUNAAN BERBAGAI TEKANAN DAN WAKTU HIDROLISIS PADA PRODUKSI GLUKOSAMIN HIDROKLORIDA DARI KITOSAN CANGKANG BEKICOT (Achatina fulica)
Get PDFABSTRACT This study aims to determine the effect of pressure and time hydrolysis to produce glucosamine hydrochloride with the highest yield and the best quality of the chitosan of a snail shell. The study used a completely randomized design (CRD) factorial design consisting of 2 factors with 5 variations of hydrolysis time (40; 50; 60; 70 and 80) minutes and 2 variations of pressure (1 atm and 2 atm). Each treatment is done twice so obtained 20 experimental units. The highest glucosamine hydrochloride was obtained in hydrolysis time of 80 minutes and a pressure of 1 atm. Yield of 7,54%. Test of solubility in distilled water at 20°C was obtained of 3,79. Mol/L, while the maximum absorption of the UV-Vis with the addition of reagent Schales is at a wavelength of 420 nm. Keywords: Snails, Chitosan, Glucosamine, Hydrolysis Time, Pressur