https://idjpcr.usu.ac.id/jsabe/issue/feed 2025-09-01T00:00:00+07:00 Riswanti Sigalingging riswanti@usu.ac.id Open Journal Systems <p style="text-align: justify;"><strong>JSABE (Journal of Sustainable Agriculture and Biosystems Engineering)</strong> is an international journal that was previously named the Bulletin Agricultural Engineering (BEARING). Since 2005, BEARING has been published several papers in printing journal with ISSN 1858-2362. In 2022, BEARING is converted to be JSABE journal which is a peer-reviewed journal published by TALENTA Publisher and Organized by the Department of Agricultural and Biosystems Engineering, Faculty of Agriculture, Universitas Sumatera Utara (USU) as an open-access journal. JSABE publishes agricultural and biosystem engineering research that represents advances in understanding or modelling biological systems' performance for sustainable developments in land use and the environment, bio-production processes and food technologies. The journal's subject matter reflects the wide range and interdisciplinary nature of research in engineering for biological systems.</p> https://idjpcr.usu.ac.id/jsabe/article/view/16549 2024-05-28T10:36:29+07:00 Putri Chandra Ayu pputricandra@usu.ac.id I Wayan Budiastra wbudiastra@apps.ipb.ac.id Sutrisno sutrisnoko@apps.ipb.ac.id Sukrisno Widyotomo swidyotomo@yahoo.com

<p>Coffee from diverse place will serve a diverse flavor, especially the accidity and bitternes, could be easily detected by human’s sense of taste. This is due to the differences of the chemical content, in this case the chlorogenic acid (CGA) and trigonelline, inside the green beans. In coffee industry the assesment of coffee quality usually done by the sertified cupper. However, the cupper could not provide the exact concentration inside and the information only determined by the chemical method such as the LCMS method. These method are expensive, time consuming and destructive the opposite with the need of industries. Near Infrared Spectroscopy (NIRS) method could be used to answer the requirement. In this study, the CGA and trigonelline concentration in coffee beans could be determined by several most representative NIR wavelenght. A hundred samples (96 grams coffee beans) were subjected to NIR measurement in the wavelength of 1000 – 2500 nm, followed by the chemical analysis by LCMS method, then calibrated by the Stepwise multiple linear regression (SMLR) method to obtain the representative NIR wavelength. Result showed that the NIR spectroscopy could determined the CGA concentration by using 24 NIR wavelenghts indicated by high r, RPD and consistency value of 0.949, 2.59 and 88.78%, respectively. However, the trigonelline could not be assesed by the SMLR method due to its small amount and its chemical bounding inside the beans.</p>

2025-09-01T00:00:00+07:00 Copyright (c) 2025 Journal of Sustainable Agriculture and Biosystems Engineering https://idjpcr.usu.ac.id/jsabe/article/view/18762 2025-04-16T14:36:09+07:00 Nopita Aisyah Tobing nopitaaisyah2001@gmail.com Sulastri Panggabean sulastripanggabean@usu.ac.id

<p>The development and use of biodiesel as an alternative energy source can be a solution to the fossil fuel energy crisis, especially as diesel oil in Indonesia and the world. This study aims to assess the quality of biodiesel with a perforated LPD type static mixer with the use of a smaller amount of catalyst, namely 0.5%, 0.4% and 0.3% KOH catalyst. The materials used in this research include palm oil, methanol, KOHm and distilled water. The process was carried out by mixing oil-methanol in a ratio of 1:6 at a temperature of 60 oC in reactor-9. The method used was Non-factorial (RAL) method with 3 treatments and 6 repetitions. The results showed that the quality of biodiesel produced met the Biodiesel Standards and Quality that have been set. The highest methyl ester content of 99.65% was found in the 0.5% KOH concentration.</p>

2025-09-01T00:00:00+07:00 Copyright (c) 2025 Journal of Sustainable Agriculture and Biosystems Engineering