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All Journal Jurnal Vokasi Devotion: Journal of Research and Community Service
Nahar, N.
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Economics, Econometrics & Finance Education Engineering Social Sciences

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Journal : Devotion: Journal of Research and Community Service

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Synthesis and Characterization of Biodiesel Production from Wolffia Using Homogeneous KOH Catalyst by In Situ Transesterification Saifuddin, S; Shalihah, Nyakty; Nahar, N.; N, Reza
Devotion : Journal of Research and Community Service Vol. 4 No. 3 (2023): Devotion: Journal of Research and Community Service
Publisher : Green Publisher Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36418/devotion.v4i3.436

Abstract

This research aims to analyze the quality and characteristics contained in biodiesels produced using Wolffia as the raw material with variations in weight of 200, 250, and 300 grams, and temperatures of 50ºC, 55ºC, and 60ºC. Furthermore, the biodiesel utilized in this study was made with reactants (Wolffia oil and methanol), fat solvent (n-hexane), and a heterogeneous catalyst (potassium hydroxide (KOH)). The results show that biodiesel formation was significantly impacted by temperature. Its volume increases with an upsurge in temperature and/or in raw materials, and the highest biodiesel product volume obtained was 81 ml. Following this, the product’s density value, which was 0.872 remained within the bounds of the SNI 04-7182:2015 standards, and the best calorific value was obtained from the biodiesel made with Wolffia, which was 9,754.70 cal/gr. Lastly, the maximum volume of Wolffia used was 300 grams, as this was the best composition to meet the SNI quality, and using the GC-MS analysis, the biodiesel’s quality was tested and found to contain methyl ester.
Removal of Acrylamida and Caffein in Gayo Arabica Coffe Beans by Vacum Roasting Aja, C. Cut; Sami, M.; Saifuddin, S.; Nahar, N.
Devotion : Journal of Research and Community Service Vol. 4 No. 7 (2023): Devotion: Journal of Research and Community Service
Publisher : Green Publisher Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59188/devotion.v4i7.519

Abstract

The conventional process of coffee roasting at high temperatures above 120oC, in addition to having high caffeine levels and reducing nutrients from coffee, will also cause the formation of acrylamide compounds causing cancer in humans. The coffee used was gayo arabica coffee (Green Bean). This study aims to produce healthy, acrylamide-free and low-caffeine coffee using a vacuum roaster. The coffee was roasted using a vacuum oven at a pressure of 0.1 bar (0.102 kgf/cm2) and at a temperature of 120, 140, and 160ºC with time variations ranging from 30, 60 and 90 minutes to obtain acrylamide-free and lower caffeine coffee. Gayo arabica coffee had acrylamide content of 0.48 mg/kg and Ijen robusta coffee of 0.659 mg/kgwhile the caffeine was 1406.87 ppm for Gayo arabica coffee and 3184.80ppm for Ijen robusta coffee. The acrylamide test was carried out using the high-performance liquid chromatography (HPLC) method at a wavelength of 202 nm, while the caffeine test was carried out using the UV-Vis Spectrophotometry method at a wavelength of 275 nm. The resulted coffee is considered safe for consumption because does not contain acrylamide and has lower caffeine content.
Co-Authors Aja, C. Cut M. SAMI, M. N, Reza Saifuddin, S Saifuddin, S. Shalihah, Nyakty Syahyadi, Rizal Syamsul Bahri