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All Journal Majalah Kulit, Karet, dan Plastik Journal Of Research and Education Chemistry (JREC) SAINTI: Majalah Ilmiah Teknologi Industri
Gusfiyesi Gusfiyesi, Gusfiyesi
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Chemical Engineering, Chemistry & Bioengineering Chemistry Control & Systems Engineering Education Engineering Industrial & Manufacturing Engineering

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Analisis sifat fisika pemanfaatan pati tandan kosong sawit dan limbah plastik LDPE sebagai bahan pembuatan plastik biodegradabel Hidayani, Tengku Rachmi; Pelita, Elda; Gusfiyesi, Gusfiyesi
Majalah Kulit, Karet, dan Plastik Vol 33, No 1 (2017): Majalah Kulit, Karet, dan Plastik
Publisher : Center for Leather, Rubber, and Plastic Ministry of Industry, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (679.695 KB) | DOI: 10.20543/mkkp.v33i1.2202

Abstract

This research aimed to overcome the issue of plastic packaging waste that accumulates in nature because synthetic polymers cannot be easily unraveled by bacteria. Biodegradable plastics were produced by mixing waste of plastics of the low density polyethylene (LDPE) with starch of empty palm fruit bunches, modified with the addition of maleic anhydride as a crosslinking agent. To produce biodegradable plastics, different compositions of LDPE waste, starch of empty palm fruit bunch, maleic anhydride, and benzoyl peroxide were used, namely (90: 10: 1: 1), (80: 20: 1: 1), (70: 30: 1: 1), and (60: 40: 1: 1). Research stages consisted of extraction of starch from palm empty fruit bunch (PEFB); preparation of biodegradable plastic powder with the reflux method and xylene solvents; and making of biodegradable plastics using the press molding method. Based on the results of characterization, it was revealed that the optimum condition was generated by biodegradable plastics with the composition of LDPE waste, starch of empty palm bunches, maleic anhydride, and benzoyl peroxide was equal to 60: 40: 1: 1, which generated the tensile strength value of 6.9410 N/m2, the elongation at break of 3.1875%, the the melting point temperature of 103oC, and the decomposition temperature of 384oC. Besides, the thermal gravimetric test generated a residue of 12.6% and results of the analysis on morphological properties suggested that the starch distributed evenly.Keywords: Biodegradable plastics, LDPE waste, LDPE-g-MA, starch, palm empty fruit bunch.
STUDI PENETAPAN KADAR ASAM HUMAT DENGAN METODE GRAVIMETRI DAN SPEKTROFOTOMETRI UV-VIS Gusfiyesi, Gusfiyesi; Arizon, Arizon; Efendi, Ressa Yuliza
JURNAL ILMIAH TEKNOLOGI INDSUTRI (SAINTI) Vol 20, No 2 (2023): VOL 20 NO 2 DESEMBER 2023
Publisher : Politeknik ATI Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52759/sainti.v20i2.239

Abstract

The content of humic acid in the soil is important to determine because humic acid plays a very important role in influencing soil fertility, soil and water chemistry. The use of commercial humic acid is one way to improve the condition of degraded soil and minimize the possibility of losing nutrients from organic fertilizer due to leaching or evaporation. The humus extraction process produces commercial humic acid whose content differs according to the region where the humus is sourced. The content of commercial humic acid is determined gravimetrically, but in this study the humic acid content of commercial humic acid was determined by comparing two analytical methods, namely gravimetry and UV-Vis spectrophotometry. In this research, wet extraction of humic acid was carried out using a mixture of 4% Na4P2O7 and 0.1N NaOH. The average value of humic acid content determined using the gravimetric method was 64.9396% and 29.5193% when tested using the UV-Vis spectrophotometric method. Based on the CoA (Certificate of Analysis) the standard value of humic acid is 50%, so it is concluded that for determining humic acid contents by the gravimetric method is better than the UV-Vis spectrophotometric method.
A Rancang Bangun Prototype Fermentor dengan Dua Aerator untuk Mengembangbiakkan Ragi Saccharomyces Cerevisiae : A Prototype Fermentor Design with Two Aerators to Cultivate Saccharomyces Cerevisiae Yeast Using Molasses as Raw Material Alfitra, M Hanif; Wanjri, Adam; Youfa, Rita; Tri Jayanti, Regna; gusfiyesi, Gusfiyesi
Journal of Research and Education Chemistry Vol. 7 No. 2 (2025): Oktober
Publisher : UIR Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jrec.2025.vol7(2).25867

Abstract

This study discusses the design and development of a prototype fermentor with two aerators to cultivate Saccharomyces cerevisiae yeast using molasses as raw material. The fermentor was designed with a capacity of six liters, equipped with a pitched blade turbine mixing system and two aerators to increase oxygen supply during aerobic fermentation. The observed variables included fermentation time, pH, temperature, and brix level. The results showed that the highest yeast growth was achieved at 72 hours of fermentation with a cell count of 1.51×108 cells/ml. The use of two aerators proved to provide more uniform oxygen distribution compared to one aerator, thereby increasing yeast growth efficiency. Thus, the designed fermentor can be used as a learning model and further laboratory research in renewable energy bioprocess techhnology.  
Co-Authors Alfitra, M Hanif Arizon, Arizon Efendi, Ressa Yuliza Elda Pelita, Elda Tengku Rachmi Hidayani Tri Jayanti, Regna Wanjri, Adam Youfa, Rita