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Rachma Wikandari
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Faculty of Agricultural Technology, Universitas Gadjah Mada, Jl. Flora No. 1, Bulaksumur, Yogyakarta 55281, Indonesia
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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 26, No 4 (2006)" : 6 Documents clear
Pengaruh Pemanasan pada Aktivitas Antioksidan Ekstrak Etanol Beberapa Varietas Ubi Jalar (Ipomea batatas L) Umar Santoso; Ellik Setyaningsih; Muhammad Nur Cahyanto
agriTECH Vol 26, No 4 (2006)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1180.469 KB) | DOI: 10.22146/agritech.9480

Abstract

The objectives of the study were to examine antioxidant activity of ethanol extracts of different varieties of sweet potato and the effect of heating on the antioxidant activity of the extracts. The varieties of sweet potato used were Cilembu, Tambakromo, and Gunung Kawi. After the peel was separated from its flesh, each fraction was dried, grounded and extracted with ethanol. Total phenol was analyzed with Folin-Ciocalteu reagent using gallic acid as a standard. Sweet potato ethanolic extracts were made into three concentrations at 100, 150, and 200 ppm in ethanol. Antioxidant activity was determined by DPPH radical scavenging method. Ethanolic extracts of sweet potato flesh and peel were heated at 100 °C for 20, 30, and 40 minutes to examine the effect of heating on the antioxidant activity. All ethanolic extracts of sweet potato exhibited antioxidant activity. There was no difference in antioxidant activity between ethanolic extracts of Cilembu, Tambakromo and Gunung Kawi varieties. Antioxidant activity of the peel extract was higher than that of the flesh for all varieties. In general, antioxidant activity increased as the concentration of the peel extract increased. Heating at 100 °C for 20 and 30 minutes increased the antioxidant activity of the extract, but decreased after heating for 40 minutes.
Degradasi Biksin Selama Pemanasan dan Pencahayaan Ardiyanto Pranata; Sri Raharjo; Umar Santoso; Haryadi Haryadi
agriTECH Vol 26, No 4 (2006)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1272.612 KB) | DOI: 10.22146/agritech.9481

Abstract

The kinetics of thermal and light induced degradation of natural bixin in a mixture of ethanol and 2 % acetic acid (80 : 20) was studied as a function of temperatures 80, 98, and 125 OC for 120 minutes. Illumination was carried out either under fluorescent or incandescent lights, both at 4000 lux for 300 minutes. The bixin concentration during heating and illumination was analysed using HPLC. The method to determine the degradation rate constant for the decay of the products from bixin was obtained using a linear regression according to first order reaction.  The results indicated that the degradation rates of bixin at 125 OC were 5.5 and 3.8 times faster than that of 80 OC and 98 OC, respectively. The energy activation of bixin was 9.82 kcal/mol. The photodegradation rate constants of bixin under incandescent or fluorescent illumination was 2.8 x 10-3 and 3.3 x 10-3 minutes-l, respectively.
Perbandingan Karakteristik Kimia Trypsin Inhbibitor Biji dan Kecambah Kedelai Bayu Kanetro; Zuheid Noor; Sutardi Sutardi; Retno Indrati
agriTECH Vol 26, No 4 (2006)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1362.269 KB) | DOI: 10.22146/agritech.9482

Abstract

This study investigated the changes in trypsin inhibitor (TI) activity, amino acid composition and protein patterns after 36 hours germination of soybeans. TI was extracted by a combination of pH precipitation and centrifugation. TI activity of seeds and germinated soybean were 1.64 and 1.68 IU/mg seeds (db) respectively. Heating of crude TI decreased heat stability of TI. The decrease of TI activity of germinated soybeans due to heating was lower than seeds. The amino acid composition and protein patterns of soybeans changed after 36 hours germination. Thr, Ala, Trp, Met and Lys decreased significantly, while Asp, Glu, Val, Phe, and Ile  increased significantly. The SDS-PAGE analysis showed that the seeds contain high-molecular weight of proteins which were degraded after 36 hours germination result in smaller molecular weight of proteins.
Desain Sistem Penunjang Keputusan untuk Produksi Buah-Buahan Unggulan Nasional Santosa Santosa; Bambang Pramudya; Moeljarno Djojomartono; Sutrisno Sutrisno; Kudang B Seminar; Slamet Susanto
agriTECH Vol 26, No 4 (2006)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (5871.187 KB) | DOI: 10.22146/agritech.9483

Abstract

The objectives of the study are : (1) to design  land  suitability database for cultivation of the national valuable fruits, (2) to design the activation information of  fruits production, including land preparation until primary postharvest handling, and (3) to design the decision support system for valuable fruits on people’s orchads to produce fresh fruits. The study was conducted in Yogyakarta Special Region, from November 1999 until March 2000.  Two kinds of data used in this study were: (a) primary data, from the direct discussion with the experts, and direct observation in the fruits production center, and (b) secondary data were collected from library studies and Agriculture Agency Offices in each regency or municipality of the Yogyakarta Special Region.  The data in the salaccias production center was established from farmers which owned orchad more than one hectare. The results of  the study were : (1) land suitability database for national valuable fruits cultivation based on relational data, (2) computerize information system, namely Salaccia (Pondoh cultivar) and Mango (Arumanis, Manalagi, Golek, and Gedong cultivar) included : land preparation, planting, fertilizing, cultivating, pest and disease control, pruning, irrigating, harvesting, cleaning of fruits, sorting of fruits, grading of fruits, ripening (specially for mango), and storage of fruits, and (3) the system has been done to determine land suitability for fruits in Yogyakarta Special Region, and the result showed that 62.39 % was suitable between output system designed and the fruits produced by the farmer, namely manggistas, pineapples, mangoes, rambutans, durians, salaccias, and lawzons.
Uji Kinerja Teknologi Kontrol Tepat Guna untuk Peningkatan Kualitas Produksi Sutera Alam Lilik Sutiarso; Atris Suyantohadi; Hari Purwanto; Radi Radi
agriTECH Vol 26, No 4 (2006)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1765.684 KB) | DOI: 10.22146/agritech.9484

Abstract

The world demand of raw-silk provides a great opportunity to the development of raw-silk production in Yogyakarta. Recently, only 21% of the overall world demand of raw-silk is fulfilled, whereas Indonesia contributes only 0.1% per year. The main problem is the lack of quality of raw-silk. The optimum growth of silkworm depends on micro environments, i.e. temperature, humidity, aeration, and light intensity. The research aimed at designing an automated “on/off” control technology in the silkworm rearing environmental monitoring in the farming system, while the expected result was high-grade quality of cocoon. In the research, two different conditions of silkworm growing environments were compared, i.e. controlled environment (in the rearing box) and uncontrolled environment. The result indicated that there was increase in  the quality of cocoon. Test of cocoons in laboratory showed that the average thickness of cocoons in controlled rearing environment and in rearing environment was 0.033 cm and 0.029 cm, respectively. The percentage of cocoons in controlled rearing environment was higher than cocoons in normal environment.
Kebutuhan Riset Pengelolaan Sumberdaya Air (SDA) di Masa Depan : Sebuah Gagasan Awal Sigit Supadmo Arif
agriTECH Vol 26, No 4 (2006)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1972.649 KB) | DOI: 10.22146/agritech.9485

Abstract

During some later years, several calamities had occurred several times in the country. Landslides and floods come during wet season and in the opposite drought happened in dry season. Just wet season end, drought comes and threat all activities of human life in most region in the country. In some places all of these conditions change very quickly. Mostly, all those occurred due to inappropriate management of water resources. This paper aims at discussing some prospects of water resources research in the future. One knows that the existence of water resources in the earth is a complex system and satisfies some certain natural laws to form an natural equilibrium, so, it more easily if management of water resources research is approached by applying system analysis. The paper also discussed application of new paradigm as well as several new research methods in social, economical and engineering aspects in water resources management.

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