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INDONESIA
Jurnal Kimia Terapan Indonesia
Published by Lembaga Ilmu Pengetahuan Indonesia
ISSN : 08532788     EISSN : 25277669     DOI : -
Core Subject : Science, Engineering,
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Materials Science & Nanotechnology
Arjuna Subject : -
Articles 5 Documents
 1 
Search results for , issue "Vol 23, No 1 (2021)" : 5 Documents clear
Synthesis Gas Production via Aqueous Phase Reforming over Hydrotalcite-supported Catalysts Luthfiana Nurul Hidayati; Anis Kristiani; Kiky Corneliasari Sembiring; Fauzan Aulia; Sudiyarmanto Sudiyarmanto
Jurnal Kimia Terapan Indonesia Vol 23, No 1 (2021)
Publisher : Research Center for Chemistry - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/inajac.v23i1.479

Abstract

Depletion of fossil fuel has gained attention to find an alternative of energy resources. The consumption of fossil fuel is increased gradually, raising many unfavourable challenges such as exploiting the unrenewable resources and causing environmental damages. This study aimed to produce clean energy derived from renewable resources. Glycerol as a by-product from biodiesel production from palm oil through  esterification process. Conversion of glycerol to synthetis gas (syngas) which produced hydrogen as the main product is considered as a renewable-clean fuel. Glycerol has been successfully converted to syngas by Aqueous Phase Reforming (APR) process over solid base catalysts. Hydrotalcite which is a layered double hydroxide used as catalyst support was impregnated with various metal promoters such as Ni, Cu, Co, Zn, and Sn. Those catalysts were characterized by Brunauer-Emmett-Teller surface area analysis, Thermal Gravimetry Analysis, Fourier Transform Infrared Spectrometry and X-Ray Diffraction to investigate the properties and structure of the catalysts. Catalytic activity was evaluated in a continuous fixed- bed reactor to produce syngas through APR reaction. The gas products were analyzed by GC-TCD, resulting Cu/hydrotalcite catalyst produced hydrogen, 55.2% v/v.
Optimatization in Bioconversion of Quercetin Glucosides Using Aspergillus acueletus LS04-3 Rizna Triana Dewi; Novita Ariani; Yasmin Ekapratiwi; Euis Filaila
Jurnal Kimia Terapan Indonesia Vol 23, No 1 (2021)
Publisher : Research Center for Chemistry - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/inajac.v23i1.472

Abstract

Microbial transformation is known to be useful for obtaining more active or less toxic compounds and achieving selective compounds conversion to more useful derivatives. The objective of this study is to explore several factors that affect the optimization of bioconversion of quercetin glucosides using Aspergillus acueletus LS04-3. To obtain the optimum condition of biotransformation the fungus was cultured under several conditions by varying the number of days of fermentation, the concentration of substrate, carbon, and nitrogen source. The transformation product was analyzed using HPLC and LCMS-MS. The results revealed that on the third-day biotransformation process, quercetin production reached the highest amount and the optimum concentration was at 50 ppm of quercetin glucoside based on HPLC analysis. In addition, from various carbon sources, glucose yielded the highest biotransformation product, while nitrogen accelerated the reaction. In this research, media of A. acueletus LS04-3 containing carbon and nitrogen could increased quercetin production. This research finding provided several factors for optimizing quercetin biotransformation by A. acueletus LS04-3. These factors were important in scaling up biotransformation even in other biotransformation reactions.                               
Ultrafiltration Membrane Performance Fitted In Dead-End Stirred Filtration Cell (DESFC) In Concentrating Shank Gelatin Aspiyanto Aspiyanto; Agustine Susilowati; Hakiki Melanie; Yati Maryati
Jurnal Kimia Terapan Indonesia Vol 23, No 1 (2021)
Publisher : Research Center for Chemistry - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/inajac.v23i1.488

Abstract

Performance of Ultrafiltration (UF) Membrane fitted in dead-end stirred filtration cell (DESFC) as a membrane-based unit operation is an essential factor in concentrating shank gelatin to produce concentrated gelatin as a food additive. This study aimed to determine the optimum performance and to evaluate the feasibility of commercial UF flat-sheet membranes (1,000, 20,000 and 100,000 MWCO) equipped in DESFC. The experiment was conducted at gelatin and water ratio of  1:0, 1:2, 1:4 and 1:6 in a laboratory scale with stirring speed of 400 rpm and trans-membrane pressure (TMP) of 40 psia for 30 minutes and resulted in retentate (concentrate) and permeate of shank gelatin. The results showed that larger pores size of the membrane and high ratio of gelatin and water increased both permeate flux and rejection. Based on permeate flux and dissolved protein, the optimum separation condition was achieved using UF membranes of 100,000 MWCO and a gelatin and water ratio of 1:6. This optimum condition resulted in permeate flux of 0.0215 mL/cm2.min. and dissolved protein Robs of 100%.
Proficiency testing scheme based on ISO/IEC 17043 in Indonesia: Strategy in complying the technical requirements for the proficiency testing providers Fransiska Sri Herwahyu Krismastuti
Jurnal Kimia Terapan Indonesia Vol 23, No 1 (2021)
Publisher : Research Center for Chemistry - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/inajac.v23i1.476

Abstract

Proficiency testing (PT) is conducted by accredited providers to assure the validity of measurements conducted by laboratories. ISO/IEC 17043 is the international standard used to assess the competency of PT providers. It consists of five clauses; scope, normative references, term and definitions, technical requirements, and management requirements. Compliance with the ISO/IEC 17043 has been challenging for PT providers especially for the new PT providers tried to gain accreditation for ISO/IEC 17043. The challenges and benefits for the PT providers on implementing ISO/IEC 17043, especially the technical requirements, are discussed with particular emphasis on the homogeneity and stability testing, statistical design, packaging and distribution of PT samples. This discussion is expected giving enlightenment for the new PT providers in complying with the ISO/IEC 17043.
Effect of Type and Concentration of Encapsulating Agents on Physicochemical, Phytochemical, and Antioxidant Properties of Red Dragon Fruit Kombucha Powdered Beverage Rena Agatha; Yati Maryati; Agustine Susilowati; Aspiyanto Aspiyanto; Anastasia Fitria Devi; Hani Mulyani; Setyani Budiari; Euis Filailla; Della Rahmawati; Nina Artanti
Jurnal Kimia Terapan Indonesia Vol 23, No 1 (2021)
Publisher : Research Center for Chemistry - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/inajac.v23i1.474

Abstract

Kombucha is a healthy beverage from the fermentation of sugared tea with a symbiotic culture of bacteria and yeast (SCOBY). There is a growing interest on kombucha due to the reported health benefits. The original kombucha is prepared using only sweetened black tea infusion. The development of kombucha, however, has been reported to incorporate other plant water extracts. A previous study showed that kombucha beverage using red dragon fruit (RDF) as an alternative substrate gave the highest antioxidant activity at 15 days of fermentation. RDF kombucha instant powder could be a new food product development due to its longer shelf life, convenience, and low distribution cost. This study aimed to determine the best and the concentration of encapsulating agent for RDF kombucha powdered beverage which could retain the antioxidant properties. RDF kombucha was spray dried using maltodextrin, gum arabic, and inulin as the encapsulating agents with various concentrations (5%, 10%, and 15%). Gum arabic was the best encapsulating agent since it gave the highest values of drying yield, pH, and  total phenolic content retention, in comparison to the other two encapsulating agents. Within the observed concentrations, the incorporation of gum arabic resulted in RDF kombucha powder with a similar appearance, red colour, and antioxidant retention. Thus, the 5% addition of gum arabic is recommended for future preparations of RDF kombucha powdered beverage.

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