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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 283 Documents
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Synthesis of Nanofiber from Polyvinyl Alcohol (PVA)-Collagen Using Electrospinning Methods Sudirman Sudirman; Aloma Karo Karo; Sulistiyoso Giat Sukaryo; Karina Dwi Adistiana; Kiagus Dahlan
Jurnal Kimia Terapan Indonesia Vol 21, No 2 (2020)
Publisher : Research Center for Chemistry - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jkti.v21i2.428

Abstract

Polyvinil alcohol (PVA) polymer can be used as matrix to be mixed with collagen in the subtance of primary wound dressing material to cover wound that prevents growth of bacteria and enhanced tissue formation. Collagen fiber is fragile, so important to combined with PVA to obtain better mechanical properties. The PVA-collagen fibers are prepared in aqueous solutions with PVA (10%) and collagen concentration (1% and 2%) using electrospinning method and the effect of voltage 15 kV, 19 kV, and 23 kV. Analysis of functional groups show that the presence of identical compounds produced and new functional groups are not formed. SEM data show that the effect of variation of voltage and collagen concentration on the resulting morphology of fiber. PVA-collagen 2% fibers produce continuous fibers, has a diameter 284-426 nm, thickness 0.0324-0.0483 mm and has a high percent of elongation so it can be used as a wound dressing material.
Magnetic Nanoparticles based on Natural Silica as a Methyl Ester Forming Acid Catalyst Falah Azizah Elmaria; S. N. Aisyiyah Jenie
Jurnal Kimia Terapan Indonesia Vol 23, No 2 (2021): Jurnal Kimia Terapan Indonesia
Publisher : Research Center for Chemistry - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/inajac.v23i2.473

Abstract

Natural silica has advantages in various fields such as catalysts, because it is easily obtained and applied in the chemical reaction process. The synthesis of natural silica-based magnetic acid catalyst, MSNP/SO42- aims to obtain a large yield from the reaction process between oleic acid and methanol to form methyl ester. Natural silica obtained from geothermal waste was washed with distilled water, then sol gel method was applied at  pH of 4-6 to obtain SiO2 nanoparticles. FeCl3 was added to achieve the magnetic properties, and the cetyl trimethyl ammonium bromide  (CTAB) is varied in order to attain optimal mesoporous size. Brunauer emmet teller (BET) results showed optimum results from 1: 2 molarity ratio between silica and CTAB with a surface area of 520.94 m2/g. The acidic properties were obtained by immersion using H2SO4 0.5 M. The catalyst were tested for the acidic and magnetic properties  using temperature programmed desorption ammonia (TPD-NH3) and vibrating sample magnetometer (VSM) characterization resulting intotal acidity of 0.2488 mmol/g and. softmagnetic type, respectively. The BET surface area  of the sulfate modified into MSNP/SO42-, was decreased by 114.44 m2/g. Application of MSNP/SO42- as a catalyst for forming methyl esters obtained a percentage of 85.41% yield based on the gas chromatography mass spectrometry (GC- MS) results.
Effect of Tackifier Addition on Cushion Compound Formulation for Tire Retreading Application Lies Agustine Wisojodharmo; Dewi Kusuma Arti; Retna Deca Pravitasari; Ade Sholeh Hidayat; Aisyah I. Nisa; Muhammad N. Ariesta
Jurnal Kimia Terapan Indonesia Vol 21, No 2 (2020)
Publisher : Research Center for Chemistry - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jkti.v21i2.427

Abstract

Tire retreading is a prospective industry. Old tires are repaired and retreaded with suitable tread compounds to fulfill the requirement as the new ones. One of the important components in tire retreading process is cushion compound. Cushion compound consists of unsaturated rubber, in this case natural rubber Hevea brasiliensis was used, less phr of filler compared to the retread compound, and additives such as peptizer, tackifier, processing oil, antioxidant, activator, accelerator and curatives. Tackifier is an important component in cushion compound since its role to make a bonding between different layer, the initial tire after buffing and new retread layer. Tackifier should has good resistance, good compatibility and does not affect the rheological and dynamical properties of bonded rubber. The general tackifier that used in industries are hexamethyl tetramine as methylene donor and resorcinol as methylene acceptor. There is certain reaction between those two additives that determine how good the performance of cushion compound and its effect to retreading process. To obtain optimum reaction, comparison between resorcinol and hexamethyl tetramine were varied as 1:1 (FRR1), 1:2 (FRR2) and 1:3 (FRR3). Hardness test, compression test, rebound resilience, tensile and tear strength, and FTIR were done to observe the optimum variation for retread application. Compared to the control with no tackifier at all, FRR2 showed the optimum result with 21.75 MPa (min. 19 Mpa) and 454,54% elongation at break (min. 450%). The most interesting result was observation by using FTIR, it was detected that the crosslink density was significantly higher than other formulation. It is a new breakthrough which is minimum tackifier with certain treatment could give better performance.
Comparison of real time PCR and conventional PCR by identifying genomic DNA of bovine and porcine Muhammad Abdurrahman Munir; Ahlam Inayatullah
Jurnal Kimia Terapan Indonesia Vol 23, No 2 (2021): Jurnal Kimia Terapan Indonesia
Publisher : Research Center for Chemistry - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/inajac.v23i2.491

Abstract

Bovine and porcine are poultry meat that consumed worldwide particularly in Southeast Asia.Both of them are prone to food counterfeit owing to several factors such as price, appetite and Halal status. Sensitive and selective analytical methods are required to control meat products that distributed to markets. This paper studied the sensitivity between real – time and conventional PCR or known as qPCR and cPCR, respectively. Bovine and porcine were samples used to verify the sensitivity of them. Nevertheless, those instruments did not show a specific difference during DNA analysis of bovine and porcine. In conventional PCR, two pairs of DNA primers targeted cytochrome b (Cyt b) was analyzed, resulting of 120 and 131 amplicons, respectively. While qPCR applied to analyze porcine and bovine DNA. The detection limit of qPCR after porcine and bovine analysis were at 0.004 and 0.007 µg/µL, respectively. Results demonstrated the qPCR was reliable for verifying porcine and bovine DNA compared to conventional PCR. Furthermore, the study concluded that the developed assay can be easily employed for the identification of porcine and bovine tissue in food products in low resource areas.
Effect of Liquid Media Composition on Alpha-Glucosidase Inhibitory Activity from Aspergillus elegans SweF9 Hani Mulyani; Rizna Triana Dewi; Euis Filailla; Nina Artanti
Jurnal Kimia Terapan Indonesia Vol 21, No 2 (2020)
Publisher : Research Center for Chemistry - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jkti.v21i2.426

Abstract

This study aims to determine the effect of liquid media composition on the inhibitory activity of α-glucosidase from endophytic fungus Aspergillus elegans SweF9 isolated from seaweed (Macroalgae Euchema sp). Fermentation was carried out in three types of liquid media, namely: potato dextrose broth (PDB), potato malt peptone (PMP), and Czapek-dox broth (CDB), which was incubated for 10 days at room temperature, with static conditions. Ethyl acetate solvents were used to extract active metabolites from fungal biomass and filtrate from each media. Antidiabetic activity was measured based on inhibition of enzyme α-glucosidase. The results showed that filtrate extract of A. elegans SweF9 which was cultured on the media PDB showed highest inhibitor activity to the α-glucosidase enzyme with an IC50 value of 1.74 µg / mL compared to other extracts. Based on these results, the PDB media is an appropriate medium for culturing A. elegans SweF9  to produces secondary metabolites that can be used as a new source of antidiabetic agents.
Antioxidant and antidiabetes activity from the fruit shell of Calophyllum inophyllum Jamilah abbas Abbas; Minarti Minarti; Nina Artanti
Jurnal Kimia Terapan Indonesia Vol 23, No 2 (2021): Jurnal Kimia Terapan Indonesia
Publisher : Research Center for Chemistry - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/inajac.v23i2.508

Abstract

The purpose
Bacterial Cellulose Production in The Overripe Guava Juice by Acetobacter xylinum as A Solution to Reduce Organic Waste Annisa Nur Lathifah; Isa Nuryana
Jurnal Kimia Terapan Indonesia Vol 23, No 2 (2021): Jurnal Kimia Terapan Indonesia
Publisher : Research Center for Chemistry - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/inajac.v23i2.493

Abstract

The exploration for a new cost-effective carbon source with shorter fermentation process for high yield BC production is still needed. In this study, bacterial cellulose (BC) was synthesized by Acetobacter xylinum using overripe guava juice as a carbon source. The results showed that A. xylinum was able to grow on the overripe guava juice with different concentration and produced BC after two days incubation. In the later on, the BC is called as nata de guava. The overripe guava juice which containing reducing sugar content 23 g /L (substrate 100%) at pH 4 produced the thickest BC (1.267 cm). This study showed due to the high reducing sugar and protein contents in the overripe guava, without the addition of carbon and nitrogen from external sources, BC could be formed. Considering the huge disposal overripe guava fruit waste in Java, the present study provides an alternative methodology to synthesize BC. Besides, most importantly, this study provides a new insight to manage organic waste specifically from overripe guava fruit rather than the waste being thrown away and becoming organic waste generation. Keywords: bacterial cellulose, Acetobacter xylinum, overripe guava, organic waste
Tapioca Waste-Methyl Methacrylate Irradiation for Biodegradable Plastic Raw Materials Akhmad Rasyid Syahputra; Tita Puspitasari; Santoso Prayitno; Ade Lestari Yunus
Jurnal Kimia Terapan Indonesia Vol 21, No 2 (2020)
Publisher : Research Center for Chemistry - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jkti.v21i2.430

Abstract

Nuclear technology can be applied not only as an energy (electricity) but also in industry as as an initiator on polymer reaction. Tapioca waste is used due to its biodegradability properties. Tapioca waste gel is formed by adding equal aquades ratio to waste weight. After gel formed, several concentrations of methyl methacrylate (w/w) is added to the gel then packed into 150 mL ampule. Using Co-60 gamma irradiation source, gel is irradiated at 5 kGy absorbed dose. Gel is extracted using acetone to get rid of sample from impurities. Glycerol as a plasticizer is added to the gel to increase polymer flexibility. Gel-Glycerol mixing is done at 60ºC, 250 rpm for one hour by adding aquadest. To analyze mechanical properties, firstly, we need to mold samples using pressurized-hot press machine. Film is formed to type 5 specimen (dog bone, astm d638-14). Specimen is tested by analyzing tensile strength characteristics. Fabrication of biodegradable plastic based packaging by using starch has an increasement of mechanical and thermal properties at 5 kGy absorbed dose. Methyl methacrylate 25, 50, 75, 100, 125 and 150% addition to the solution has 10-24 MPa tensile strength. Gel fraction has range between 88-100%. Even the lowest ratio of monomer addition can provide highest gel fraction to improve mechanical properties of tapioca waste. 
Study of Total Phenolic, Total Flavonoid, Scopoletin Contents and Antioxidant Activity of Extract of Ripened Noni Juice Lia Meilawati; Teni Ernawati; Rizna Triana Dewi; Megawati Megawati; Sukirno Sukirno
Jurnal Kimia Terapan Indonesia Vol 23, No 2 (2021): Jurnal Kimia Terapan Indonesia
Publisher : Research Center for Chemistry - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/inajac.v23i2.480

Abstract

AbstractExtraction of ripened noni juice has been carried out using ethanol and water. The purpose of this study was to determine the total phenolic, total flavonoids, scopoletin, content and antioxidant activity of the ripened noni juice extract. The activity test was carried out on the ripened noni juice extract without and with the addition of ethanol and water solvent. The phytochemical assays of ethanol extract of the ripened noni juice showed that thetotal phenolic content was 3,94 mg gallic acid equivalent/g extract, the total flavonoids was 0,59 mg quercetin equivalent /g extract, the IC50 antioxidant activity was 24,92 mg/L, scopoletin content was 2,45 mg/gram.Keywords : Antioxidant, flavonoids, phenolic, ripened noni juice, scopoletin
Preface, Editorial Board, Table of Contents, and List of Abstracts Ahmad Randy
Jurnal Kimia Terapan Indonesia Vol 21, No 2 (2020)
Publisher : Research Center for Chemistry - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jkti.v21i2.439

Abstract

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