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The Journal of Pure and Applied Chemistry Research
Published by Universitas Brawijaya
ISSN : 23024690     EISSN : 25410733     DOI : http://dx.doi.org/10.21776/ub.jpacr
Core Subject : Health, Science, Engineering,
Chemical Engineering, Chemistry & Bioengineering Chemistry Materials Science & Nanotechnology Medicine & Pharmacology
The Journal of Pure and Applied Chemistry Research focuses in publishing research articles in the field of Chemistry and Applied Chemistry. The target is in exploring, investigating, and developing chemicals sources from local and/or Indonesian to increase the value. Scope of the journal is organic chemistry, analytical chemistry, inorganic chemistry, biochemistry, and physical chemistry. Included the topic also organic chemistry natural product, theoretical and computational chemistry.
Arjuna Subject : Kimia(semua kategori) - Kimia (Lain-Lain)
Articles 12 Documents
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Search results for , issue "Vol 8, No 1 (2019): Edition January-April 2019" : 12 Documents clear
Lactobacillus plantarum Fermentation Effect on Tannin Reduction, Proximate Analysis, and Protein Profiles of Ganyong (Canna edulis Kerr) Flour Azor Yulianus Tefa; Arie Srihardyastutie; Sasangka Prasetyawan
The Journal of Pure and Applied Chemistry Research Vol 8, No 1 (2019): Edition January-April 2019
Publisher : Chemistry Department, The University of Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jpacr.2019.008.01.437

Abstract

One of the problems in using ganyong (Canna edulis Kerr)as food is the presence of tannin, an antinutritional substance, that can reduce the nutritional quality of ganyong. The purpose of this study was aimed to analyze the effect of fermenting ganyong using Lactobacillus Plantarumbacteria on the chemical compounds and the reduction of tannin level in its flour. Theresults showed that the optimum conditions of fermenting ganyong were at pH 6, the temperature of 40 oC, and at the fermentation time of 36 hours. At the optimum conditions, Lactobacillus Plantarumwas able to decrease tannin content in ganyong from 2.53 mg/mL to 0.84 mg/mL. The reduction of tannin content is due to the activity of tannase produced by the microorganisms. Fermentation caused the enrichment protein content, from 1.87% to 2.01% and the reduction of starch, amylose, and amylopectin contents to 51%, 16.82%, and 38.08% from 60.19%, 18.27%, and 43.49% respectively. SDS-PAGE results showed that the protein profiles changed in ganyong sample after the fermentation process. Protein with a molecular weight of 72.49 kDa which showed in the non-fermented ganyong, did not appear in the fermented ganyong, and protein band intensities also showed changes.
Geochemical Distribution of Copper and Zinc in the Aquatic Sediment of Nyolo Spring Water at Karangploso Malang East Java Anis Khoirun Nisa; Barlah Rumhayati; Andi Kurniawan
The Journal of Pure and Applied Chemistry Research Vol 8, No 1 (2019): Edition January-April 2019
Publisher : Chemistry Department, The University of Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jpacr.2019.008.01.443

Abstract

Aquatic sediment has a role for heavy metals sink. Understanding the geochemical fractions of heavy metals in the aquatic sediment can predict the mobility and reactivity of heavy metals fractions that can induce environmental problems. The aim of this study was to determine the distribution of geochemical fractions of copper and zinc in aquatic sediment of Nyolo spring. Sediments samples were taken from five locations along the spring. Geochemical fractions of copper and zinc were extracted using BCR (Community Bureau of Reference) sequential extraction method. The concentration of these metals in each extract was analyzed using AAS. The result showed that overall the sediment consisted of zinc at a higher concentration than copper. Amongst the geochemical fractions, copper and zinc were found dominantly at an oxidizable fraction. As the first fraction, Zn was more bioavailable than copper for biological uptake. Furthermore, based on the Risk Assessment Code (RAC) value, the aquatic sediment of Nyolo Spring was low risk to the Zn and Cu contaminations at most sites, except for Zn in Site III showed a medium risk. This metals fraction will potentially available for organism uptake with the changing of pH sediment or overlying water

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