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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 4 Documents
 1 
Search results for , issue "Vol 11, No 4 (1991)" : 4 Documents clear
Aktivitas Fitase Pada Tahap-Tahap Pembuatan Tempe dari Kara Benguk, Gude, dan Kara Putih Menggunakan Usar Tranggono Tranggono; Sutardi Sutardi; Meta Mahendradatta
agriTECH Vol 11, No 4 (1991)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2236.645 KB) | DOI: 10.22146/agritech.19226

Abstract

Penelitian dilakukan untuk mengkaji perubahan aktivitas fitase selama proses pembuatan tempe kara benguk, gude dan kara putih dengan menggunakan usar. Ekstrak kasar fitase dipersiapkan metalui beberapa tahap isolasi dan pemurnian, sedangkan aktivitas Masa diukur berdasarkan jumlah fosfat anorganik yang dibebaskan dari substrat natrium fitat pada kondisi pengujian yang ditetapkan. Suhu dan pH optimum untuk fitase kara benguk dan kara putih berturut-turut 60°C clan 4,8 sedangkan untuk gude berturuHurut 50°C dan 5.0. Hasil yang diperoleh menunjukkan penurunan aktivrtas fitase selama perlakuan perendaman pada kara benguk dan kara putih, berturul-turul dan 129.56- 48.73 μ mol dan 169,30-77.92 μ mol. Pada gude tidak ditakukan pengujian aktivitas fitase selama perlakuan perendaman, Pada tahap fermentasi 0 - 24 jam. terjadi kenaikan aktivitas fitase berturut-turut dari 0 - 193,23 μ mol, 0 - 96.24 μ mol dan 5,56-46,33 μ mol untuk kara benguk, gude dan kara putih. Setelah 24 jam ferrnentasi, aktivrtas fitase turun menjadi berturut-turut sebesar 60,72 μ mol. 59.56 μ mol dan 7.68 μ mol. Selama fermentasi 36 - 48 jam, aktivitas fitase naik lagi berturut-turut sebesar 164,76 μ mol, 118,59 μ mol dan 9,27 μ mol untuk kara benguk. gude dan kara putih. Selama proses pembuatan tempe kandungan asam fitat turun berturut-turut dari 0,37 - 0,14%, 0,42 - 0,10% dan 2,26 - 0.16% masing-masing dalam berat kering untuk kara benguk, gude dan kara putih,
Hydrolysis of Soybean Protein by Aspergillus sojae, A. oryzae, and Rhizpus oligosporus Endang Sutriswati Rahayu
agriTECH Vol 11, No 4 (1991)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2604.098 KB) | DOI: 10.22146/agritech.19227

Abstract

Three species of molds, i.e. Aspergillus sojae. A. oryzae and Rhizopus oligosporus were used to hydrolyze soybean proteins. Whole soybeans were soaked overnight and cooked in boiling water for an hour, drained, sterilized at 121°C for 15 minutes, then cooled and inoculated with A. oryzae. A. sojae, and R. oligosporus. As a control treatment another batch of soybeans was prepared for spontaneous fermentation. Fermentation tasted for five days. Based on the colony forming units (CFU), A. sojae, A. oryzae R. orgosporus and the control reached the stationary phase on the third day of fermentation. The CFU of A. sojae and A. oryzae were higher than that of the others, with 107 - 108 CFU/g dry weight for A. sojae and A oryzae and 106 - 107 CFU/g dry weight for the others. The proteolytic activity of A. sojae. oryzae, R. oboosporus and the control was maximum on the third day. The proteolytic activity of A: sojae and A. oryzae using soybean as substrate was higher (180 - 200 units tyrosine/g dry weight) than the other two groups (100 - 120 UT/g dry weight).Based on the efficiency of hydrolysis, A. sojae and A. oryzae had a higher hydrolysis percentage, giving 32 - 33% and total soluble nitrogen of 2.1 - 2.2 percent/g dry weight. The hydrolysis efficiency of R. ologosporus and the control was 21 - 22%. with the total soluble nitrogen 1.4 - 1.5 percent/g dry weight. The difference in initial pH i.e. pH 5.0: pH 6.0 and pH 6.7 did not affect the soluble nitrogen production significantly.
Crab As A Coconut Oil Separating Agent Sebastian Margino
agriTECH Vol 11, No 4 (1991)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (3242.029 KB) | DOI: 10.22146/agritech.19228

Abstract

The role of sterilized and nonsterilized crab extract on the separation of coconut oil was examined using grated coconut meat as substrate. Sterilized crab extract was prepared by suspension and centrifugation of crushed crab and then filtrated using Millipore Utter. Sterilized crab extract has proteolytic activity but not lipolytic one. It was found that the sterilized crab extract supported the growth of proteolytic microbes, isolated from fermentation process of coconut oil. Both sterilized and nonsterilized crab extract gave no significant difference in the quantity of coconut oil obtained. However, coconut oil from the sterilized crab extract has better quality. The peroxide value of coconut oil from unsterilized crab extract was higher than that of standard quality of coconut oil according to SII and AOCS. The possible roles of crab inoculum in fermentation process of coconut oil are discussed.
Tropical Hydrology Simulation Model 1 For Watershed Management (Trophydsim-1) Sahid Susanto
agriTECH Vol 11, No 4 (1991)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (4981.306 KB) | DOI: 10.22146/agritech.19229

Abstract

A hydrological. simulation model, named the Tripical Hidrology Simulation Model I (Trophydsim-1), was created in order to simulate the run-off processes in mountainous terrain in a tropical monsoon region. The hydrological cycles in five major land covers, i.e., forest, upland, plantations (normally tobacco areas), paddy fields, and settlements, were each analogized by a series of four storages representing interception. depression, upper. zone and lower-zone storages. A set mathematical equations expressing empirical formula as well as physical law were employed in the model. An automatic parameter optimization routine was presented. The model was applied to the Kali Progo river basin. Central Java. Indonesia. which contains five subbasins. The simulated and recorded hydrographs were in close agreement both at every transfer point of the subbasins and in three different calendar years with different land use patterns.Some hydrologic characteristics were found from application of the model. The basin, which is mainly comprised of fresh volcanic formations. is capable of storing much water and releasing it gradually as groundwater flow. Therefore. the basin provides stable low flow for irrigating paddy land, which has expanded to 40 to 60 percent of the whole basin area. with multiple cropping patterns of rice-rice-upland crops or even rice-rice-rice.The model was also applied to simulate the effect on water regime of different modes of watershed management of simply land use patterns. Five scenarios representing extreme conditions of land use and four more realistic

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