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Dina Kartika Maharani
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Department of Chemistry, Faculty of Mathematics and Natural Sciences, Surabaya State University, located at Jl Ketintang, Surabaya, East Java, Indonesia. 60231
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Unesa Journal of Chemistry
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Published by Universitas Negeri Surabaya
ISSN : -     EISSN : 22528180     DOI : https://doi.org/10.26740/ujc.v11n2
Core Subject : Science, Engineering,
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Energy Materials Science & Nanotechnology
UNESA Journal of Chemistry is online Journal covering all aspects of Chemistry. The journal publishes original research paper and review articles.
Arjuna Subject : Kimia(semua kategori) - Kimia (Lain-Lain)
Articles 16 Documents
 1   2 
Search results for , issue "Vol 10 No 3 (2021)" : 16 Documents clear
PENGARUH LAMA PEMANASAN PROSES FERMENTASI TERHADAP KADAR FENOLIK TOTAL DAN AKTIVITAS ANTIOKSIDAN BAWANG HITAM Alfiatus Solichah; Nuniek Herdyastuti
Unesa Journal of Chemistry Vol 10 No 3 (2021)
Publisher : Department of Chemistry, Faculty of Mathematics and Natural Sciences, Surabaya State University, located at Jl Ketintang, Surabaya, East Java, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (342.984 KB) | DOI: 10.26740/ujc.v10n3.p280-287

Abstract

Black garlic is the result of the fermentation process at certain intervals so that is dark brown and has a fresh sweet taste. When compared to fresh garlic, black garlic does not have a strong off flavor due to the heating process which reduces the allicin content which is converted into the antioxidant compound S-allyl cysteine. The purpose of this study was to determine the effect of heating time fermentation process on total phenolic content and antioxidant activity of black garlic. Measurement of total phenolic content using the Folin-Ciocalteu method and using the DPPH method to measure its antioxidant activity. The experiment was conducted with different heating length treatment at intervals of 0 – 15 days. The results showed that the total phenolic content and antioxidant activity of black garlic increased with the length of heating time. The heating time had a significant effect (α = 0.05) on total phenolic content and antioxidant activity compared with garlic. Key words: black garlic, total phenolic content, antioxidant
REVIEW: IMOBILISASI ENZIM PAPAIN DENGAN SILIKA MESOPORI DAN KARAGENAN SEBAGAI BAHAN PENDUKUNG Kuala Wirida Wening; Nuniek Herdyastuti
Unesa Journal of Chemistry Vol 10 No 3 (2021)
Publisher : Department of Chemistry, Faculty of Mathematics and Natural Sciences, Surabaya State University, located at Jl Ketintang, Surabaya, East Java, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1453.7 KB) | DOI: 10.26740/ujc.v10n3.p268-279

Abstract

Papain is a protease enzyme obtained from papaya plant that able to hydrolysis protein into amino acid. Papain plays an important role in the industrial fields so generally papain immobilized on support material to maximize its function. This review is intended to describe the recent development of papain immobilized in silica mesoporous and papain immobilized in carrageenan. The method used was a literature review. The review of secondary data includes papain can be immobilized using one or more methods, like adsorption, cross-linking, entrapment, and covalent binding. Electrostatic interaction becomes the main driving force for papain adsorbed onto silica mesoporous or entrapped in carrageenan. FTIR (Fourier-transform Infrared Spectroscopy), molecular docking, and MD simulation (Molecular Dynamics) were used to analyze the presence of papain in the support material. The characteristics of the papain such as pH, temperature, activity, and repeated usage will change as a result of the immobilization process. Key words: Papain enzyme, enzyme immobilization, silica mesoporous, carrageenan
PENGARUH KONSENTRASI KLORAMFENIKOL TERHADAP ADSORPSI POLIMER CETAK MOLEKUL DENGAN METODE PRESIPITASI Ainun Rachmatina Atqa; Maria Monica Sianita
Unesa Journal of Chemistry Vol 10 No 3 (2021)
Publisher : Department of Chemistry, Faculty of Mathematics and Natural Sciences, Surabaya State University, located at Jl Ketintang, Surabaya, East Java, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (665.874 KB) | DOI: 10.26740/ujc.v10n3.p257-267

Abstract

The aims of this study to synthesize Molecularly Imprinted Polymer (MIP) which can be used as adsorbents for chloramphenicol adsorption (CAP). The performance of the MIP adsorbent was tested for adsorption with variations in the initial CAP concentration. The CAP concentrations used were 10, 25, and 50 ppm. The characterization of the resulting MIP, Non-Imprinted Polymer (NIP), and Blank Polymer (PB) were analyzed using Fourier Transform Infrared (FTIR), to determine the -NO2 group. The results showed that the greater the initial CAP concentration, the higher the adsorption capability in MIP and PB. The largest adsorption capability in this study for MIP was 16.54 mg/g and PB was 8.78 mg/g at a concentration of 50 ppm. MIP has a higher adsorption capability than PB due to the specific adsorption of MIP to CAP. The imprinting factor (IF) value obtained is 1.88. FTIR results showed the presence of –NO2 group at wave number 1560.62 cm-1 in MIP with a lower intensity than NIP. This indicates the presence of CAP that has been eluted in the extraction process. Key words: Molecularly Imprinted Polymer, chloramphenicol, adsorption
REVIEW ARTIKEL: KARAKTERISTIK DAN PERANAN ENZIM LIPASE PADA PRODUKSI DIACYGLYCEROL (DAG) DARI VIRGIN COCONUT OIL (VCO) Emilisia Fatimah
Unesa Journal of Chemistry Vol 10 No 3 (2021)
Publisher : Department of Chemistry, Faculty of Mathematics and Natural Sciences, Surabaya State University, located at Jl Ketintang, Surabaya, East Java, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1238.797 KB) | DOI: 10.26740/ujc.v10n3.p246-256

Abstract

Lipase enzyme is an acyl hydrolase that functions in the digestion and processing of fat. Lipase enzyme have activities that can hydrolyze various fats and oils, each one unit per mL (U/mL) of lipase enzyme activity can release 1 µmol of free fatty acids per minute. Lipase enzyme activity at optimum conditions obtained from measurements of enzymatic activity at modification of temperature and pH. Lipase enzyme can be found in plants, animals, and microorganisms. Coconut (Cocos nucifera L.) is a plant that produces lipase enzymes which can produce Virgin Coconut Oil (VCO). VCO can be converted into diacylglicerol (DAG) by hydrolysis or trans-esterification using chemical or enzymatic methods. DAG is a type of healthy oil that can reduce the content of Low Density Lipoprotein (LDL), triglycerides (TG) and become a plasminogen inhibitor. Key words: Lipase, Diacyglycerol (DAG), Virgin Coconut Oil (VCO)
REVIEW: POTENSI SECANG (Caesalpinia sappan L.) DALAM TERAPI ARTRITIS REUMATOID Fauzia Indah Sabila; Tukiran Tukiran
Unesa Journal of Chemistry Vol 10 No 3 (2021)
Publisher : Department of Chemistry, Faculty of Mathematics and Natural Sciences, Surabaya State University, located at Jl Ketintang, Surabaya, East Java, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1682.338 KB) | DOI: 10.26740/ujc.v10n3.p231-245

Abstract

Artritis reumatoid (AR) is a chronic inflammatory disease caused by inflammatory mediators that migrate to synovial and particular tissues. The disease is characterized by synovial inflammation that leads to the destruction of cartilage and joint damage. Although conventional treatments of AR such as NSAID, corticosteroid and DMARDs commonly alleviate the symptoms of AR, but the high edverse of these treatments leads AR patients toward alternative medicine. The purpose of the present review is to evaluate the potential of secang in rheumatoid arthritis therapy. Various phytochemical components of secang provide pharmacological effects such as antioxidant activity in suppressing oxidative stress as a promoter for disease, including inflammation. Anti-inflammatory and anti-arthritis activities of secang are able to inhibit pro-inflammatory cytokine regulation and cartilage degradation in AR. The pharmacological effect of secang has the potential to be used as a functional food or supplement in the therapy of AR by preventing, treating and repairing the damage caused by AR.. Key words: Anti-arthritis, Anti-infammatory, Anti-oxidant, Artritis Reumatoid, Caesalpinia sappan L.
PENGARUH SUHU KALSINASI TERHADAP UKURAN KRISTAL DAN KOMPOSISI FASA PADA SENYAWA TiO2 Amos Tigor Tobing; Dina Kartika Maharani
Unesa Journal of Chemistry Vol 10 No 3 (2021)
Publisher : Department of Chemistry, Faculty of Mathematics and Natural Sciences, Surabaya State University, located at Jl Ketintang, Surabaya, East Java, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (803.835 KB) | DOI: 10.26740/ujc.v10n3.p367-373

Abstract

TiO2 or commonly called Titanium dioxide is a semiconductor transition metal. This metal is commercially shaped white powder. This material is often used in research into the development of photocatalysts effects in material. TiO2 is used in paints as compounds that give rise to self-cleaning properties. This property is the nature of a material to clean itself from impurities. Self cleaning works with the help of the photocatalyst effect, which is where with the help of photon energy. Therefore semiconductor material can be used in these properties. This is because Titanium dioxide is a semiconductor compound which has a band gap energy of 3.2 eV for the anastase phase, and for the rutile phase of 3.0 eV. This study aims to determine the effect of calcination temperature on the characteristics of TiO2 compounds. In this research, TTiP is a precursor of TiO2 synthesis, and the method used is the sol-gel method. After synthesis, TiO2 is calcined at 400°C, 450°C, 500°C, and 550°C. The characterization carried out in this research is to use the Fourier Transform Infra Red (FTIR) instrument that functions to determine the functional groups formed and the X-Ray Diffraction (XRD) instrument which functions to determine the phase composition of the compound. From the research that has been carried out obtained functional groups -OH, Ti-O, and Ti-O-Ti. This shows that TiO2 was successfully formed through the sol-gel method. In the phase analysis, the results showed that TiO2 is in the anastase phase. This shows that TiO2 can function well when applied to photocatalysts Keywords: Titanium Dioxide (TiO2), Calcination Temperature, photocatalysts, Self cleaning

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