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All Journal JURNAL REKAYASA DAN MANAJEMEN AGROINDUSTRI

I M. Mahaputra Wijaya

Dosen Program Studi Teknologi Industri Pertanian, Fakultas Teknologi Pertanian, Unud

Author-ID : 2929654

Agriculture, Biological Sciences & Forestry

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Deteksi Migrasi Material Pembungkus Makanan ke Air karena Pemanasan Teguh Pribadi Girsang; I M. Mahaputra Wijaya; Ida Bagus Wayan Gunam
JURNAL REKAYASA DAN MANAJEMEN AGROINDUSTRI Vol 8 No 2 (2020): Juni
Publisher : Department of Agroindustrial Technology, Faculty of Agricultural Technology, Udayana University

This research was aimed to detect if migration of additives or other components from plastic material used as packaging of hot food/drinks were occurred in warm-hot cooked temperature. In this works, plastic samples as like spoon, packaging, and wraps were taken directly from mainly street food vendors and shops. Pure water and plastics samples were mixed, and heat were introduced to induced migration. Three temperature of 60 °C, 80 °C, dan 100 °C, were each applied to induced migration for one hour. Migrations were detected using UV-Visible Spectroscopy, Fourier Transform InfraRed, and Gas Chromatography. Migrated polymer materials from plastics were detected through peaks of UV-visible absorption with water as background spectra were subtracted, and its functional groups were detected using FTIR spectroscopy. Gas chromatography was used to confirm if UV-visible and FTIR results were result from single component migration. Keywords: polymer, migration, temperature, plastics, wavelength.

Variasi Konsentrasi Glukosa pada Media Tumbuh dan Lama Fermentasi Dalam Memproduksi Etanol oleh Isolat BM1-CP14 Nurul Lita Ajizah; I M. Mahaputra Wijaya; Nyoman Semadi Antara
JURNAL REKAYASA DAN MANAJEMEN AGROINDUSTRI Vol 9 No 2 (2021): Juni
Publisher : Department of Agroindustrial Technology, Faculty of Agricultural Technology, Udayana University

This study was aimed determine the effect of glucose concentration on ethanol producing BM1-CP14 isolate media and to determine to optimum fermentation time to producing ethanol and to determine the growth phase curve of BM1-CP14 isolates. This study uses 4 glucose concentration (8, 12, 16 and 20%) and 3 fermentation time (14, 17 and 20 days). The experimental-explorative research process was carried out in several stages, namely rejuvenation of BM1-CP14 cultures, culture grow, cell isolates adjustment, glucose level on fermentation media measurement, fermentation, and distillation. The glucose concentration which are at the range of 10?18% have an optimum effect in producing ethanol The highest total ethanol was obtained from the glucose concentration of 16% with a fermentation time of 10 days having a difference in total dissolved solids of 8.30 (?% brix) resulting in the highest total ethanol of 38.75 mL. The glucose concentration of 8% resulted in a less than optimal total ethanol, which was 18.00 mL with a difference in total solids of 4.20 (?% brix), while the glucose concentration of 20% has a difference in total dissolved solids of 6.20 (?% brix) and produced a total ethanol of 26.50 mL. The Fermentation time of 14, 17, and 20 days was effected in producing ethanol, namely if the fermentation was longer, the total ethanol produces would be lower. The fermentation time of 14 days resulted in a total ethanol of 37.50 mL with a difference in total dissolved solids of 5.05 (?% brix). In longer fermentation of 17 and 20 days, the total ethanol produced was decreased, produced smaller total ethanol. The growth curve of BM1-CP14 isolates showed the growth isolates of BM1-CP14 with a growth time of 54 hours, starts from the exponential phase for 12 hours, the stationary phase for 18 hours and ends in the death phase. Keywords: Bacteria, BM1-CP14 isolate, ethanol, fermentation time, glucose concentration

Isolasi dan Karakterisasi Jamur Pelapuk Putih Pendegradasi Lignin dari Limbah Cair Pulp dan Kayu Lapuk Eukaliptus (Eucalyptus sp) Ida R Hasibuan; Nyoman Semadi Antara; I M. Mahaputra Wijaya
JURNAL REKAYASA DAN MANAJEMEN AGROINDUSTRI Vol 9 No 1 (2021): Maret
Publisher : Department of Agroindustrial Technology, Faculty of Agricultural Technology, Udayana University

Lignin is an organic polymer compound that is difficult to degrade in the environment because of its very complex structure consisting of an aromatic ring group and three carbons in the side chain. This exploratory study aims to determine whether white rot fungi isolated from wastewater from eucalypt pulp and weathered wood are lignolytic and the ability of the isolates to degrade tannins as an approach in the lignin degradation process. The experimental design is divided into two stages, namely: 1) Isolation of fungi that have the ability to degrade tannins quantitatively and qualitatively as well as characterization of fungi morphologically (macroscopic and microscopic). 2) Testing the ability of superior white rot fungus isolates in degrading tannins at concentrations of 0.5%, 1%, 1.5% and 2% of tannins. The brown zone formed in white rot fungal isolates was measured the zone diameter and intensity of the brown color. The results of this study indicate that of the 29 isolates obtained, there were five superior isolates capable of degrading tannins, namely isolates LD06, LD07, BE01.3, BE01.4 and BE02.2. BE01.3 was isolated at 2% tannin concentration, the second largest diameter of the brown zone after LD06 isolate and the highest brown color intensity level three with a slightly dark brown color intensity, namely slightly blackish brown. Keywords: Isolation, characterization, white rot fungi, tannins, lignin degradation

Isolasi dan Karakterisasi Bakteri Penghasil Etanol dari Lingkungan Industri Arak Bali di Desa Merita dan Tri Eka Buana, Karangasem-Bali Azis Akbar Hakim; I M. Mahaputra Wijaya; Ida Bagus Wayan Gunam
JURNAL REKAYASA DAN MANAJEMEN AGROINDUSTRI Vol 8 No 2 (2020): Juni
Publisher : Department of Agroindustrial Technology, Faculty of Agricultural Technology, Udayana University

The purpose of this research is isolation and characterization to find potential bacteria which can produce the most optimal ethanol from the Arak Bali industry in Karangasem Regency, Bali. Bacteria were isolated by exposure method in open air using selective media Zymomonas Sucrose Medium (ZSMA) with the addition of nystatin as much as 0.18 g / L as an antifungal then samples were taken at three different points in one Arak Bali production location, namely the distillation place, the fermentation room for roomie, and the place of taking coconut juice under the coconut tree and the variation of time is 15, 30, and 60 minutes of exposure. Gas checking is done on the bacteria obtained to select its ability to produce ethanol. The results of the scanning of 11 best isolates using UV-visible spectrophotometry were fermented on 500 mL ZSM media for 10 days. BM1-CP14 is the best isolate to produce total ethanol of 15.33 mL through the fermentation process. The results of the characterization of BM1-CP14 isolates were Gram-positive bacteria in the form of bacilli, anaerobic and non-motile bacteria. The results showed that bacteria isolated from open-air also can produce ethanol. Keyword: ethanol, Arak Bali, airborne bacterial exposure, isolation, characterization, UV-Visible spectrophotometry

Kajian Terhadap Migrasi Plastik Hasil Induksi Panas pada Beberapa pH dan Jenis Asam Organik Gabriella Mutiara Haseama; I M. Mahaputra Wijaya; Ni Putu Suwariani
JURNAL REKAYASA DAN MANAJEMEN AGROINDUSTRI Vol 8 No 3 (2020): September
Publisher : Department of Agroindustrial Technology, Faculty of Agricultural Technology, Udayana University

In Indonesian street food vendor, most of hot acidic food and drinks are served with plastic packaging and plastic cutlery. This research is aimed to study about the presence of plastic’s component migration as a result of heat induction in the presence of various pHs and organic acid, and to identify the types of migrated plastic components through its functional groups. In this research, the samples were 10 plastic packaging and cutlery made from LDPE, HDPE, PP, PE, and PS plastic. Acetic acid, citric acid, and lactic acid and three levels of pH which were pH 4, 5, and 6. Temperatures of 80 and 100 ? were used as representation of food and drinks served warm. Each samples were conditioned in each organic acids solutions with different pH (pH 4, 5, and 6) and thermal treatments were carried out for 1 hour in each temperature. The plastic migrations were detected using UV-Visible spectroscopy, followed by FTIR spectroscopy to identify functional groups of the migrated plastic components, followed by prediction of the migrated compound. The results suggested that plastic component migration were detected in all samples, and using lactic acid pH 4, 5, and 6 an antistatic diethanolamides was ruled plausible released from white plastic glass sample. Keywords : plastic migration, organic acids, pH, spectroscopy, temperature.

Co-Authors Azis Akbar Hakim Gabriella Mutiara Haseama Ida Bagus Wayan Gunam Ida R Hasibuan Ni Putu Suwariani Nurul Lita Ajizah NYOMAN SEMADI ANTARA Teguh Pribadi Girsang

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