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agriTECH
Published by Universitas Gadjah Mada
ISSN : 02160455     EISSN : 25273825     DOI : 10.22146/agritech
Core Subject : Agriculture,
Agriculture, Biological Sciences & Forestry
Agritech with registered number ISSN 0216-0455 (print) and ISSN 2527-3825 (online) is a scientific journal that publishes the results of research in the field of food and agricultural product technology, agricultural and bio-system engineering, and agroindustrial technology. This journal is published by Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta in colaboration with Indonesian Association of Food Technologies (PATPI).
Arjuna Subject : Ilmu Pertanian dan Biologi (Semua) - Ilmu Pertanian dan Biologi (Lain-Lain)
Articles 6 Documents
 1 
Search results for , issue "Vol 18, No 2 (1998)" : 6 Documents clear
Pola Respirasi dan Senyawa Flavor Selama Tahap Pemasakan Buah Salak Pondoh Tranggono Tranggono
agriTECH Vol 18, No 2 (1998)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1033.241 KB) | DOI: 10.22146/agritech.19343

Abstract

Studies on respiration pattern and flavor compound changes 'during maturation stage in the development of snake fruit (Salacca edulrs Reinw cultivar Pondoh) were carried out at picking times of 4.5, 5.0, 5.5, 6.0 and 6.5 months after pollination. At each time, samples were drawn for determinations of edible portion, moisture; respiration rate, ester and carbonyl compounds as well as their flavor profiles by gas liquid chromatography. Result showed that the development of maturation degree gives rise to an increase in the relative percentage of edible portions. The snake fruit displayed a non-climacteric pattern of respiration. During maturation stage from 4.5 until 6:5 months after pollination, the fruits exhibited a decrease in ester and an increase in carbonyl compounds. However, fruits picked at 6.5 months after pollination revealed an additional in respiration rate as well as ester content and a diminishing in carbonyl compounds. These may be due to stress condition caused by initial break down of edible tissues. Flavor profile chromatograms which were obtained from head space analyses, showed that changes in volatile compounds in term of type and their relative percentages occur during maturation.
Isolasi Bakteri Penghasil Enzim Lipase Penghasil Alkali dari Kulit Hewan V.S. Pertiwi Rumiyati; Retno Indrati
agriTECH Vol 18, No 2 (1998)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1512.933 KB) | DOI: 10.22146/agritech.19344

Abstract

Twenty seven bacterial strains isolated an a medium containing 0.50% palm oil as substrate and 0.015% spirit blue as an indicator from several raw hides of chicken, goat and cow showed an extracellular lipase activity. Of these strains, 10 were higher lipase producers. Lipases produced from five of these 10 isolates were stable on alkaline conditions, ranging from pH 8.0 to 11.0. Furthermore, activity of these enzymes was not inhibited by the presence of non-ionic, cationic nor ionic surfactants at concentration of 0.05% or 0.10%. Conversely, some of these surfactans could even activate the enzyme.
Pengaruh Rasio Bungkil Kedelai dan Kacang Gude Terhadap Karakteristik Tahu B.A. Susila Santosa; Narta Narta; S. Widowati
agriTECH Vol 18, No 2 (1998)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1251.417 KB) | DOI: 10.22146/agritech.19345

Abstract

Soybean oil cake and pigeonpea were the alternatives vegetable protein sources besides soybean. Their high protein content has not been considered yet in the food processing technology especially for tofu product. This study evaluated ratio of soybean oil cake to pigeonpea used in tofu processing, tofu characteristics and recovery, anti nutrition content and organoleptics characteristics of tofu. Ratio of soybean oil cake to pigeonpea used in this study were 100:0; 90:10; 80:20; 70:30; 60:40; and 50:50. The result showed that ratio of soybean oil cake to pigeonpea effected tofu characteristics and recovery. Ratio 100:0 gave the best result either in nutrition (protein) content or recovery, but the tofu contains the highest anti nutrition too. Tofu made from material with ratio of 90:10 and 80:20 had the same characteristics and better than others. Organoleptically, tofu made from material with ratio 100:0; 90:10 and 80:20 were valued higher than others. This study needs to be developed in order to find the best processing technique and condition in larger scale.
Koefisien Perpindahan Panas Permukaan Bola dengan Aliran Udara Paksa dalam Pipa B. Rahardjo; B. Suratmo; Sukarjo Sukarjo
agriTECH Vol 18, No 2 (1998)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1387.489 KB) | DOI: 10.22146/agritech.19348

Abstract

Handling and processing of agricultural products mostly consist of heat transfer. Commonly the heat process of agricultural products is conducted in closed systems with air forced circulation. The process of heat transfer is significantly controlled by the values of the coefficient of surface heat transfer. Therefore the objectives of the research were to determine the pertinent parameters affecting the coefficient of heat transfer of sphere in forced air circulation and then to develop the mathematical relationship of those parameters. The mathematical relationship was determined using dimensional analysis composing dimensionless numbers such as Nusselt, Reynolds and size ratio. The coefficient of surface heat transfer were determined by heat capacitance method and analytical approaches using samples of spheres made from copper and wood respectively. The results indicate that the relation of the dimensionless groups were significant. The coefficient of surface heat transfer appropriately can be expressed using the pertinent parameters.
Pengkajian dan Penanganan Daerah Aliran Sungai Bagian Hulu dengan Pendekatan Model ANSWERS, Bagian 1 : Prediksi Air Limpasan Suharyono Suharyono; Putu Sudira; Sukirno Sukirno
agriTECH Vol 18, No 2 (1998)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1240.421 KB) | DOI: 10.22146/agritech.19349

Abstract

The Area Nonpoint Sources Watershed Environment Response Simulation (ANSWERS) model as the distributed hydrologic model for the simulation of 10 scenarios of land uses is presented. The model is based on the assumption that at any point of watershed spatial, runoff volume is closely related to the hydrologic and physiographic processes such as, rainfall intensity, infiltration rate, soil moisture content, soil behaviour, land slope and vegetative cover. The discharge hydrograph of the model gave a good result and was statistically significant to the observed hydrograph.. Among the ten scenarios of land uses, the lowest peak discharge of 7.7. m3/second was obtained at the simulation of 80% of forest land, meanwhile the highest peak discharge of 33.36 m3/second was obtained when there was no forest land at the study area.
Pencemaran Pangan Oleh Jamur, Potensi Bahaya dan Pencegahannya Sardjono Sardjono
agriTECH Vol 18, No 2 (1998)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1682.737 KB) | DOI: 10.22146/agritech.19350

Abstract

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