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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

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 93 Documents

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PENGARUH SUHU TERHADAP KANDUNGAN FENOLIK TOTAL DAN AKTIVITAS ANTIOKSIDAN BAWANG PUTIH BUBUK DAN BAWANG HITAM BUBUK Ika Novianti Safitri; 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

Black garlic is a fresh garlic product that has been heated for two weeks at a controlled temperature (65-90oC). Black garlic has a different color, smell, and taste than fresh garlic. High moisture content of garlic and black garlic make these foods spoil easily. Oven drying techniques can extend the shelf life of garlic. The purpose of this research is to determine the effect of drying temperature on total phenolic content and antioxidant activity of garlic powder and black garlic powder. Garlic and black garlic are to be dried at 60, 70, 80, and 90oC. Total phenolic content was determined by Folin-Ciocalteu reagent and antioxidant activity was measured by 2,2-diphenyl-1-picryhydrazyl (DPPH) method. The results of this reasearch showed that the best drying temperature for garlic was 60oC which had total phenolic content 0,178 mg gallic acid equivalent (GAE)/g and moderate antioxidant activity with IC50 value 105.01 ppm; while the best drying temperature for black garlic was 80oC which had total phenolic content 2.957 mg gallic acid equivalent (GAE)/g and strong antioxidant activity with IC50 value 67.32 ppm. Key words: black garlic, garlic, phenolic, antioxidant

PENGARUH VARIASI KOMPOSISI EKSTRAKTAN TERHADAP KEMAMPUAN ADSORPSI KLORAMFENIKOL MENGGUNAKAN MOLECULARLY IMPRINTED POLYMER (MIP) Eucharistia Oktavia Firda Listiadi; 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

The aim of this study is optimazing the extractant composition of methanol:acetic acid was with variations of 90:10(v/v), 85:15(v/v), and 80:20(v/v) in the (Molecularly Imprinted Polymer- Chloramphenicol) MIP-CAP synthesis. MIP-CAP is obtained from (Non Imprinted Polymer)NIP through the template extraction process. The template was extracted using maceration method and analyzed using High Performance Liquid Chromatography (HPLC) to determine the extracted CAP. The best extractant composition variation was determined based on % extraction and adsorption capability. The characterization of the MIP-CAP polymer was carried out using Fourier Transform Infra Red (FTIR) to see the presence of the –NO2 group. In this study, the best composition of methanol:acetic acid extractant was 80:20 (v/v) (20% acetic acid) with extraction % gain of 89,5158% and adsorption capability of 4,0725 mg/g with the value of Imprinting Factor (IF) of 3.7369. The higher the addition of acetic acid, the higher the % extraction and adsorption capability. The FTIR characterization of MIP-CAP showed that there was no absorption of the –NO2 group. Key words: CAP, MIP-CAP, Composition of Extractant

PENENTUAN TOTAL FENOLIK, TOTAL FLAVONOID DAN AKTIVITAS ANTIOKSIDAN EKSTRAK DAUN BAWANG KUCAI (Allium tuberosum) Jihan Shofwatul Islam Dalilah Aziz; Mirwa Adiprahara Anggarani
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

The purpose of this research was to determine total phenolic, total flavonoid and antioxidant activity of chinese leeks extract. The extraction process involves a method of leveling using three different types of solvents are dichloromethane, ethyl acetate and ethanol 96%. The samples tested included analysis of total phenolic using Folin-Ciocalteau method, total flavonoid using colorimetric aluminum chloride method and antioxidant activity using DPPH method. The results showed that dichloromethane extract was not found phenolic and flavonoid compounds that are potential as antioxidants. Total phenolic content in ethyl acetate and ethanol extract were 9.5975 mg GAE/g extract and 11.8015 mg GAE/g extract. Total flavonoid content were 4,3454 mg QE/g extract and 7,7165 mg QE/g extract. The value of IC50 on ethyl acetate extract were 563,1250 ppm and and ethanol extract 312,5532 ppm, which are categorized as weak antioxidant. Keywords: chinese leeks, total phenolic, total flavonoid, antioxidant activities

STUDI ELEKTROKIMIA EKSTRAK BETALAIN UMBI BIT SEBAGAI PEWARNA ALAMI DSSC (DYE SENSITIZED SOLAR CELL) Elma Alfianti Indri Lestari; Pirim Setiarso
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

This research was conducted to explore and utilize fresh beetroot as raw material for natural dyes in DSSC. DSSC (Dye Sensitized Solar Cell) is a photovoltaic cell that can convert sunlight into electricity using environmentally friendly raw materials and low production costs. In this study, DSSC was made using the doctor blade method using natural dyes derived from betalain tuber extract. beet. Natural dyes were chosen because they are easy to obtain, as well as cheap and environmentally friendly. The betalain from the beetroot is macerated with ethanol as a solvent. Characterization of natural dyes was carried out using UV-Visible spectrophotometry to determine the wavelength absorption, electrochemical characterization of dyes was carried out using cyclic voltammetry, and to determine the efficiency of the DSSC was carried out by I – V characterization. In this study, an absorption wavelength of 534 nm was produced which showed the uptake of the pigment betasianin. The electrochemical characterization showed that the energy of the HOMO (Highest Occupied Molecular Orbital) in the dye was -5.00 eV. The LUMO (Lowest Unoccupied Molecular Orbital) energy in dye is -3.71 eV. Analysis of the energy bandgap (energy gap) of the dye yields 1.29 eV, meaning that the prepared dye can be used as a sensitizer on the DSSC. I-V characterization showed that the efficiency value of DSSC with natural dye for beetroot was 0.004%. These results indicate that the natural dye extract of beetroot betalain can be used as a natural dye in DSSC. Key words: betalain,DSSC,electrochemical

REVIEW: POTENSI EKSTRAK KAYU SECANG (Caesalpinia sappan L.) SEBAGAI ANTIDIABETES MELLITUS Ashari Kurniawan Sarjono; 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

Diabetes mellitus is an acute metabolic disorder with several causes with symptoms such as high blood sugar volume accompanied by disorders of carbohydrate, lipid and protein metabolism as a result of insulin function insufficiency. The use of synthetic hypoglycemic chemical drugs can cause some side effects and require relatively expensive costs, so traditional herbal medicine is preferred because it has less side effects and lower costs. Plants that can be used as traditional medicine are secang wood plants (Caesalpinia sappan L). Based on literature studies, compounds contained in the stem or wood part of secang contain flavonoid, tannins, gallic acid, resins, brasilein, α-phellandrene, oscimene, essential oils, resorcinol, and brasilin. It is known that tannic acid (tannins) has antioxidant activity and has an antidiabetic mellitus effects and the brazilin content of secang wood plays a very important role in reducing blood sugar levels. brazilin has three mechanisms of action in reducing blood sugar levels, namely reducing oxidative stress, inhibiting intestinal mucosa GLUT 2, and inhibiting phosphodiesterase. The antihyperglycemic activity of brazilin helps insulin work in the absorption of glucose from the bloodstream into adipose cells by increasing the translocation of glucose transport especially GLUT4. This shows that the extract from the secang wood plant has the potential as an antidiabetic mellitus. Keywords: Antidiabetic mellitus; Antioxidant; Hyperglycemic; Secang wood

PENENTUAN FENOLIK TOTAL, FLAVONOID TOTAL, DAN AKTIVITAS ANTIOKSIDAN EKSTRAK BAWANG LANANG (Allium sativum L.) Dhini Tri Wilujeng; Mirwa Adiprahara Anggarani
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

Free radicals are unstable molecules that can cause oxidative stress. Oxidative stress can lead to damage to cells, tissues, and organs, which can lead to degenerative diseases. Oxidative stress can be reduced by increasing the body's immunity through antioxidants, where these antioxidants can be found in one of the natural ingredients, namely single bulb garlic. The purpose of this study was to determine the potential of imported single bulb garlic with various solvents as a source of natural antioxidants based on total phenolic levels, flavonoids, and antioxidant activity. The Follin-ciocalteu method was used to determine total phenol, total flavonoids were determined colorimetrically with AlCl3, and antioxidant activity was determined by the DPPH (2,2-diphenyl-1-picryhydrazyl) method. The results showed that the total phenolic extract of ethanol 96%, ethyl acetate, and dichloromethane were 13.77 (medium); 26.60 (medium); and 6.36 (low) mg GAE/gr extract. The total flavonoids of ethanol 96% extract, ethyl acetate, and dichloromethane were 0.97; 2.88; and 0.47 mgQE / gr extract. Meanwhile, the antioxidant activity (IC50 value) for 96% ethanol extract was 339.69 ppm (weak), 174.03 ppm for ethyl acetate extract (medium), and 430.48 ppm for dichloromethane extract (weak). Based on the research results, it can be concluded that imported single bulb garlic with the three solvents have potential as a source of natural antioxidants, but the test results are no better than total phenolic, total flavonoids, and antioxidant activity of local single bulb garlic. Key words: Total Phenolic, flavonoid, antioxidant, single bulb garlic

PENGARUH SIRUP UMBI YAKON TERHADAP BIOAVAILABILITAS FE (ZAT BESI) RATTUS NORVEGICUS Alif Wildan Mohammad; Leny Yuanita
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

Yacon roots syrup is a processed product with high FOS content. FOS is a prebiotic compound that can increase the production of SCFA. SCFA can cause the pH in the colon to decrease which results in the bioavailability of Fe. The purpose of this research were to determine the effect of Yakon roots syrup supplementation on the bioavailability of Fe and the relationship between SCFA and Fe bioavailability. There were 43 R. norvegicus that divided into 3 treatment groups, namely the intake of yacon roots syrup supplements, commercial FOS, and water with a treatment duration of 48 days. The feces from each group were dry digested and then tested using SSA to determine the Fe content. Data were analyzed through the Aova one way, post hoc, and Pearson product moment correlation with a significance degree of 5%. The results showed that the significance value of Yakon roots syrup on Fe bioavailability was 0.034 and SCFA for Fe bioavailability had a coefficient correlation of 0.834. This can be interpreted yacon roots syrup supplementation could increase and significantly affect the bioavailability of Fe and there is a strong relationship between total SCFA levels and the average percentage of Fe bioavailability. The higher the SCFA levels in the colon, the higher the bioavailability of Fe. Key words : Fe bioavailability, FOS, yacon roots, SCFA

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

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

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

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

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Home Page

OAI Link

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Contact Name Dina Kartika Maharani

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Phone +628174140131

Journal Mail Official dinakartika@unesa.ac.id

Editorial Address Department of Chemistry, Faculty of Mathematics and Natural Sciences, Surabaya State University, located at Jl Ketintang, Surabaya, East Java, Indonesia. 60231

Location Kota surabaya, Jawa timur INDONESIA

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Contact Name
Dina Kartika Maharani

Contact Email
dinakartika@unesa.ac.id

Phone
+628174140131

Journal Mail Official
dinakartika@unesa.ac.id

Editorial Address
Department of Chemistry, Faculty of Mathematics and Natural Sciences, Surabaya State University, located at Jl Ketintang, Surabaya, East Java, Indonesia. 60231

Location
Kota surabaya,

Jawa timur

INDONESIA