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Istiqomah Rahmawati
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istiqomah.rahmawati@unej.ac.id
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jobc@unej.ac.id
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Journal of Biobased Chemicals (JOBC)
Published by Universitas Jember
ISSN : 27463257     EISSN : 27462544     DOI : https://doi.org/10.19184/jobc.v2i1.116
Core Subject : Science, Engineering,
Chemical Engineering, Chemistry & Bioengineering Chemistry
The scopes of this journal include the following topics: 1. Components extract from bioresources 2. Chemical and physical processing of biomass 3. Biobased materials and composites 4. Biobased energy production 5. Catalyst technology for biomass conversion 6. Biological processing of bioresources, chemicals and waste 7. Treatment of biobased chemical waste 8. Application of the biobased chemical products to the target users 9. System analysis, management, and environmental protection of biobased chemical processing This journal does not consider the topics about organic chemicals from non-organism, crops and breeding, organism modification, metabolic engineering, bioresources and environmental management which do not relate to biobased chemical processing.
Arjuna Subject : Teknik Kimia (semua kategori) - Bioengineering
Articles 5 Documents
 1 
Search results for , issue "Vol. 3 No. 1 (2023): Journal of Biobased Chemicals" : 5 Documents clear
Optimasi Uji Total fenolik Labu Siam (Sechium edule) Menggunakan Ultrasonic-Assisted Extraction dan Response Surface Methodology Relyando, Syahfa Adinda; Ayu Wulandari; Ditta Kharisma Yolanda Putri; Bekti Palupi; Istiqomah Rahmawati
Journal of Biobased Chemicals Vol. 3 No. 1 (2023): Journal of Biobased Chemicals
Publisher : Program Studi Teknik Kimia Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/jobc.v3i1.276

Abstract

Chayote (Sechium edule) is a plant from the Cucurbitaceae family that contains several vitamins such as vitamins A, B, and C, and is often used for medicinal purposes. Based on phytochemical analysis, chayote extract contains bioactive compounds in the form of phenolics. Phenolic compounds are secondary metabolites and are used as cosmetic and medicinal ingredients due to their ability to reduce oxidative stress. This research aims to determine the total phenolic content and antioxidant activity of chayote (Sechium edule) extract using UV-Vis spectrophotometry. Chayote extract was obtained using the Ultrasonic Assisted-Extraction (UAE) method with 96% ethanol solvent. The extraction variables used were time (15, 20, and 25 minutes), amplitude (45, 65, and 85%), and solvent ratio (1:5, 1:10, and 1:15). The determination of total phenolic content was based on the Folin-Ciocalteau method, while antioxidant activity was determined using DPPH. The determination of chayote extraction parameters for total phenolic content was carried out using the Response Surface Methodology with a Box-Behnken type. The optimal conditions obtained for chayote extraction were 1.327 mg GAE/g sample for total phenolic content and 29.45% for antioxidant activity under the conditions of 20 minutes extraction time, 65% amplitude, and 1:10 solvent ratio.
Extraction of Phenolic Active Compounds from Coffee Leaves (Coffea sp.) Using the Ultrasound Assisted Extraction Method and Total Phenol Analysis Alfinaini, Nur Aini Dwi Alfinaini; Boy Arief Fachri; Pratamai Shelli; Helda Wika Amini; Istiqomah Rahmawati
Journal of Biobased Chemicals Vol. 3 No. 1 (2023): Journal of Biobased Chemicals
Publisher : Program Studi Teknik Kimia Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/jobc.v3i1.278

Abstract

Coffea sp. is one of the largest plantation commodities in Indonesia, especially coffee leaves containing phenolic compounds. This research was conducted to extract phenolic compounds using the Ultrasound-Assisted Extraction method with ethanol solvent which aims to determine the optimum operating conditions of extraction as well as the influence of variations in amplitude, time, and ratio of solvents produced. The experimental design was carried out using Design Expert 13 software with the response surface method box-Behnken design. The research variables used were amplitude variations (50%, 60%, and 70%), time (10, 20, and 30 minutes), and solvent ratios (0.1; 0.15; and 0.2 g/mL).Based on our study, these parameters affect the total phenolic content. The model equation for the total phenolic content of coffee leaves obtained is Y = 0.1349 – 0.0016 A – 0.0505 B + 0.0010 C + 0.0018 AB + 0.0043 AC – 0.0018 BC – 0.0004 A2 + 0.0178 B2 – 0.0014 C2 (R2 = 0.9758) with the optimum total phenolic content located in the 17th running of 0.209 mg GAE/g under conditions of 20 minutes, the ratio of material to solvent is 0.2 g/mL, and an amplitude of 50%.
Preparation of a hollow fiber membrane made of antifouling PVDF/Zeolit using the dip-coating technique Mumtazah, Zuhriah; Adinda Yufriza; Husna Wardati; Ditta Kharisma Yolanda Putri; Meta Fitri Rizkiana; Reva Edra Nugraha
Journal of Biobased Chemicals Vol. 3 No. 1 (2023): Journal of Biobased Chemicals
Publisher : Program Studi Teknik Kimia Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/jobc.v3i1.279

Abstract

The practical technique for membrane modification is dip coating. This study coats a PVDF hollow fiber membrane-based composite with a coating of zeolite. The composite is made of a polyvinylidene fluoride (PVDF) membrane. During water filtering, the separation capabilities and propensities of composite membranes for organic impurities were examined. Fourier-transform infrared spectroscopy analysis of the findings demonstrated that the Zeolite coating was successfully deposited on the PVDF membrane. The flux recovery ratio increases from 69% to 80% while the relative flux drop decreases from 63% to 50%. A composite PVDF membrane dip-coating of Zeolite with a GA and H2SO4 ratio of 1:2 is needed to remove about 75% of humic compounds from effluent. The results of this study show that the addition of Zeolite with a GA and H2SO4 layer can greatly improve the hydrophilicity, selectivity, and anti-organic fouling of the PVDF hollow fiber membrane.
Efficient Anthocyanin Extraction from Aqueous Mixture of Cocoa Peel Using Microwave Assisted Extraction (MAE) Method Lutsi, Nurtsulutsiyah; Yakub Hendrikson Manurung; Istiqomah Rahmawati
Journal of Biobased Chemicals Vol. 3 No. 1 (2023): Journal of Biobased Chemicals
Publisher : Program Studi Teknik Kimia Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/jobc.v3i1.281

Abstract

Anthocyanins are polyphenolic compounds whose existence is very abundant in nature with diversity in various types of plants. The purpose of this study was to optimize the anthocyanin extraction process from cocoa shell waste using the MAE method in order to obtain the optimum particle size, ingredient/solvent ratio, and extraction time to produce high anthocyanin concentrations. The optimized extraction process variables include the size of the particle (1,05; 1,25; 1,49 and 2,5 x 10-4 m), the ratio of substrate/solvent (4,5; 12,5; 62,5; 79,5 x 10-3 g/mL), time of extraction (2, 4, 10, 14 minutes) and microwave power (100; 275; 450; 625 watts). The Design Expert vs11 program with the Box-Behnken Design Response Surface Methodology (RSM) was used in the research and the selection of process conditions was carried out from a combination of factors that resulted in an optimal response. The relationship between variables on the modeled anthocyanin concentration response: Y=0,000486-9,98637E-07A+0,026734B0,000041C-7,58240E-07D-0,000102AB+2,48606E-07AC+2,62878E09AD-0,000539BC+0,000012BD+9,71853E08CD (A: particle size; B: cocoa shell: solvent ratio; C: extraction time; D: microwave power). The optimal response value for anthocyanin concentration was 11,85.10-4 M and the conditions of the extraction process are the particle size in the extraction process was 0,105 mm, the ratio of cocoa peel mass/ethanol was 0,03125 g/mL, the extraction time was 2 minutes, and the microwave power was 100 W.
Adsorption of Methylene Blue by Magnetic Activated Carbon/Chitosan Composites Prepared from Spent Coffee Grounds : Kinetic, Equilibrium and Thermodynamic Study Santosa, Iliya Kartika; Meta Fitri Rizkiana
Journal of Biobased Chemicals Vol. 3 No. 1 (2023): Journal of Biobased Chemicals
Publisher : Program Studi Teknik Kimia Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/jobc.v3i1.282

Abstract

Spent coffee grounds were used as the main ingredient for the composing of magnetic activated carbon/chitosan (MACC) composites and synthesized using the coprecipitation method. The SEM-EDX characterization was used to understand elemental identification and morphology of the adsorbent before the MACC was applied for the removal of methylene blue (MB) from aqueous solution. Magnetic activated carbon/chitosan was fabricated with the subsequent circumstances: the molar ratio of ferrous/ferric ions was 0.02 mol : 0.01 mol, coprecipitation temperature at 60°C for 5 h. Adsorption parameters for MB were investigated. The adsorption by MACC was evaluated thermodynamically for the discharge of MB from an aqueous solution as adsorption reckon on temperature. Calculations of thermodynamic parameters were conducted. Batch adsorption experiments were operated at 308 K; 318 K and MB concentration of 5-50 mg L-1 to investigate the adsorption behavior. According to the results, MACC has a porous structure. The adsorption process is more reactive upon raising the temperature, a process commonly known as endothermic. Based on R2values, the adsorption of MB onto MACC was found best fitted to Freundlich model. The maximum adsorption capacity of the MACC was counted as 24.5 mg/g. The adsorption process is spontaneous, which was concluded from the calculation of thermodynamic parameters.

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