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agriTECH

agritech
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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 1,392 Documents

100 101 102 103 104

Pendinginan Partikel Berbentuk Bola dalam Tumpukan oleh Penguapan Air Permukaan dengan Aliran Udara Paksa dalam Pipa Budi Rahardjo
agriTECH Vol 18, No 1 (1998)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Fruits and other horticultural products are commonly harvested at high atmospheric temperatures. Since high temperatures significantly make the respiration rate increase and may reduce the quality of the products, the products are necessarily cooled as soon as possible. Accordingly, the objectives of the studies were to develop models for estimating temperature distribution on spherical particles stacked in pipe and cooled by water surface evaporation. The temperature distributions on particles were based on the transient cooling on spheres. The temperature gradient along the pipe was related to the pipe size, particle size, particle position, and air flow rate. Dimensional analysis was used to relate the particle average temperature to the pertinent parameters. The average temperature was calculated using the Heisler chart based on particle center temperature. The results indicate that the average temperatures of the particles can be estimated based on the pertinent parameters. The formulae of the exact solution of the transient heat transfer on spheres can be used to estimate the temperature of the particle during evaporative cooling

Pembuatan Brondong dari Berbagai Beras B.A. Susila Santosa; Narta Narta; D.S. Damardjati
agriTECH Vol 18, No 1 (1998)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

A technology of puffed-salted rice processing has been studied. Five rice varieties (IR 64, IR 42, IR 48, Cisadane and Gemar) were used. Salt solution was sprayed onto the rice prior to puffing, at level of 10 % of rice weight. Puffed salted rice were compared to puffed unsalted-rice. The results showed that either rice varieties or salting affected the puffed rice characteristics. Puffed rice of Gemar variety had the highest whiteness and volume expansion, and lowest hardness. Protein quality decreased in the puffed rice, indicated by decreasing in amino acids composition. Aromatics and S-amino acid were more susceptible to degradation during puffing than the others. Salt spraying before puffing resulted in puffed rice with lower whiteness and volume expansion, and higher water solubility and gel consistency. Salting also increased amino acids susceptibility to degradation during puffing. Salting, however, decreased in the ability to absorb water and increased hardness, therefore the treatment would keep puffed rice crispy for longer lime rather than puffed, unsalted-rice. Organoleptics evaluation also showed that puffed rice of Gemar variety had the high score of color, appearance, taste and crispiness, though poor in flavor. Rice salting decreased in the panelist acceptability of color and appearance, but increased in the crispiness, taste and flavor acceptability.

Modifikasi Proses Pembuatan Dodol Haryadi Haryadi; Sai'in Sai'in; Suhardi Suhardi
agriTECH Vol 18, No 1 (1998)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Preparation of a traditional starch-based sweet (dodol) involved mixing or blending of ingredients comprising glutinous rice flour, coconut milk, coconut sugar, and water with continous stirring until a semi-elastic mass is obtained. The process is labourious and lengthy. Effort were made to simplify and shorten the process by modification of the steps of preparation. Modification I involves steaming of the mixture of glutinous rice flour and water, pounding the cake, boiling the pounded cake with sugar solition; Modification H steaming of the mixture of glutinous rice flour and water, pounding the cake, steaming the mixture of pounded cake and sugar solution; Modification III soaking glutinous rice, boiling the rice with coconut milk, pounding the cake, boiling the punded cake with sugar solution; Modification IV soaking glutinous rice, boiling the rice with coconut milk, pounding the cake, and then steaming the mixture of pounded cake and sugar solution. The resultant dodols were analyzed for water and reducing sugar, the sensoriy of dodol was characterized, and the length of processing steps was evaluated. The result indicated that processes involving steaming to replace boiling gave higher moisture content but resulted in lower reducing sugar which was related with higher sensoric taste and colour scores. All the modified processes gave acceptable products. Modification II even resulted in better overall aceptability of the dodol compared to that of the traditional process, although the value for texture was less than that of the traditional dodol due to higher moisture content. Further, Modification H needed less time than the traditional method did.

Evaluation of Groundwater Pollution Nitrogen Fertilizer Using Expert System Mongkon Ta-oun; Mohamed Daud; Mohd Zohadie Bardaie
agriTECH Vol 18, No 1 (1998)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

An expert system was used to correlate the availability of nitrogen fertilizer with the vulnerability of groundwater to pollution in Peninsula Malaysia to identify potential groundwater quality problems. The expert system could predict the groundwater pollution potential under several conditions of agricultural activities and exiting environments. Four categories of groundwater pollution potential were identified base on an N-fertilizer groundwater pollution potential index. A groundwater pollution expert system developed can be use as a tool for the implementation of groundwater pollution potential approach. This facilitated the identification of priority areas for future on site sampling and quantification of groundwater quality. Current cropping patterns and practice need to be evaluated in areas with high susceptibility to groundwater pollution and availability of nitrogen fertilizer. This study indicated that the cultivation of crops requiring high nitrogen fertilizer application rates have the potential to impact groundwater quality. This impact will vary from study area to area on the specific crops grown and their distribution over vulnerable areas.

Cloning of Lab Gene Encoding Bacteriocin From Pediococcus acidilactici Fil Into Escherichia coli DH5a Sebastian Margono; Agus Wijaya; Endang S. Rahayu
agriTECH Vol 18, No 3 (1998)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Pediococcus acidilactici F11 is able to inhibit the growth of related species of enterobacteriaceae by secreting bacteriocin. Effort to increase bacteriocin production by transforming lab gene encoding bacteriocin from P. acidilactici Fl 1 into E. colt DH5a was carried out. Plasmid pPAF11 (encoding bacteriocin from P. acidilactici F11) and p13C19 as vector which were double-digested with Madill and BamHI, ligated, and transformed into E. colt DH5a. White colonies, as indicator of transformant, were picked up and grown in LB-broth medium containing ampicilin. Test ability of the transformant in expressing lab gene was done by heating the supernatant of the transformant at 95-98Â° C for 15 minutes and determining its inhibition against Enterococcus faecalis as bacterial indicator. Location of lab gene was confirmed by analyzing recombinant plasmid and curing plasmid using acrydine orange. Analysis of the plasmid carried by transformant revealed that plasmid size was similar to that of P. acidilatici. This led to a suggestion that the plasmid was a shuttle plasmid.

Aktivitas Antioksidatif Pasta Kacang Tanah Sangrai Nordiansyah Firahmi; Sutardi Sutardi; Haryadi Haryadi
agriTECH Vol 18, No 3 (1998)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Antioxidative activity of peanut butter made from peanut roasted at various temperatures and times and at different level of peeling were studied. Dry fresh peanut of different level of peeling, Lei) whole, shelled d hulled samples were roasted at 150 , 160 , 170 , and 180 C for 30, 45, .60, and 75 min. The roasted samples were freed from the shell and hull and then ground to pass a 0.2 mm screen. The resulted peanut butters were characterized for their oxidative ittibition by incorporating them into oleic acid and kept at 60 C for 24, 48, and 72 hr, and then the peroxide values were followed. Lower peroxide value reflected higher antioxidative activity. The antioxidative activity was expressed as the ability of the butter to inhibit oxidation of oleic acid. Peroxide value of the kept oleic acid increased tremendously, while those of the mixtures of oleic and the butters made from peanut of various treatment after keeping for 24 hr showed no difference from each other. After kept for 48 hr the difference in peroxide value of the mixtures was again not found. Keeping for 72 hr resulted in significantly difference in the values. The butter made from roasted; shelled peanut showed higher antioxidative activity (62,62%) than that obtained from roasting of unshelled peanut did (62,22%). Excluding peanut hull in grinding roasted peanut to produce butter gave lower activity (62,27%) than grinding of roasted peanut along with the hull did (64,56%). Increase in temperature and roasting time resulted in increase in the activity. From the various temperature the highest antioxidative activity was shown by the butter made from peanut roasted at 180 C (64,90%) and the lowest value was resulted from the roasting at 150 C (61,46%). While from the various roasting times, the lowest activity was given by roasting of peanut for 75 min (67,03%) and the lowest value resulted from roasting for 30 min (58,43%)

Substitusi Beras dengan Jagung pada Pembuatan Lempeng Gendar dengan Cara yang Disederhanakan Ag. Pamudji Rahardjo; Haryadi Haryadi
agriTECH Vol 18, No 3 (1998)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Traditional rice crackers (lempeng gendar) were prepared by a simplified processing method involving milling of rice, mixing of the flour with boiled water and traditional alkaline salt and NaCI, steaming of the dough on trays, cooling, slicing, drying, and finally frying. The raw material was varied by adding corn flour to the rice (IR-36 and IR-42) flours to get the proportions of 100, 75, 50, 25% and 0 % (100% corn flour). Higher amilose content of the flours (IR-42 rice 15.1%, IR-36 18.4%, and corn 26.8%) gave higher moisture content of the raw rice crackers produced by the simplified method, smaller expansion of the fried product with a consequence of smaller higroscopicity, but resulted in poorer crispiness. Rice crackers made from IR-36 rice flour substituted with 0r75% corn flour, and those made from IR-42 rice flour substituted with 0-50% showed significantly no difference in the overall acceptability with the poduct made from IR-36 rice flour by adopting the traditional processing way. Therefore, the simplified method, which took a shorter time, might replace the traditional way, and substitution of rice with corn to produce the traditional rice crackers was adoptable.

Pengkajian dan Penanganan Daerah Aliran Sungai dengan Pendekatan Model Answers Bagian H : Prediksi Erosi, dan Sedimentasi Suharyono Suharyono; Putu Sudira; Sukirno Sukirno
agriTECH Vol 18, No 3 (1998)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

The amount of sediment which will leave to or deposit in the elements of watershed was able to be calculated by ANSWERS model at different land uses, soil types and land slopes. The simulation model resulted the soil erosion of 2,228 WOK' or equal to 51,99 ton/ha/year at the existing rainfall (21,95 mm). Considering the tolerable soil erosion of the study area of 30 ton/ha/year, the optimal forest land area needed in this watershed is 70% of the total land area, where the soil erosion is still less than the tolerable soil erosion, that is 21, 98 ton/ha/year. This value is less than 58,77% of the existing soil erosion

Integrasi Penerapan HACCP dan ISO 9000 dalam Industri Pangan Sri Raharjo
agriTECH Vol 18, No 3 (1998)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

HACCP (Hazard Analysis Critical Control Point) is a preventive system for assuring the safe production of food product. ISO 9000 refers to a group of international standards containing a specific group of clauses directed at the quality management process of an organisation. The purpose of this paper is to discuss the differences and similarities between HACCP and ISO 9000. Both HACCP and ISO 9000 are fundamental to a process and focus on preventing rather than detecting or correcting a problem. ISO relates to the system, not the product. Food industries should not try to choose either one or the other. Individually they are both exellent programs. Integration of these two can bring the best of both and much more.

Pemakaian Hasil Analisis Harmonik Hasil Sedimen (Sediment Yield) Untuk Pemantauan dan Evaluasi Manajemen Daerah Aliran Sungai (DAS) (Studi Kasus Di Sub DAS Tapan) Sigit Supadmo Arif
agriTECH Vol 16, No 1 (1996)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Departemen Kehutanan sebagai instansi pemerintah yang bertanggung jawab atas kelestarian hutan dan lahan atasan di suatu Daerah Aliran Sungai (DAS) telah melaksanakan beberapa program beserta tindakan pemantauan dan evalualinya (monitoring and evaluation), meskipun belum mempunyai prosedur dan metode yang baku. Tujuan utama tulisan ini ialah melakukan evaluasi manajemen DAS dengan memakai analisis harmonik hasil sedimen sebagai salah satu peubah (variable) pemantauan (monitoring) usaha perbaikan manajemen lahan yang telah dilakukan, dengan mengasumsikan bahwa proses perubahan watak DAS dalam kurun waktu yang ditinjau berlangsung dalam keadaan tunak. Lokasi penelitian dilakukan di Sub DAS Tapan yang merupakan bagian DAS Bengawan Solo. Analisis dilakukan terhadap data hasil sedimen untuk kurun waktu 1974 - 1979, 1983 -1988 dan 1986 - 1990. Hasil analisis menunjukkan bahwa pemakaian analisis harmonik memberikan akurasi nisbi tinggi pada kurun-kurun waktu awal dan semakin lama semakin mengecil untuk kurun-kurun waktu setelahnya. Hal ini dapat disimpulkan bahwa perubahan watak DAS dalam keadaan tunak berlangsung pada kurun waktu awal untuk kemudian berangsur-angsur berubah menjadi proses tak lunak sesuai dengan proses perubahan tata guna lahan. Proses tak tunak juga ditunjukkan oleh perubahan harga koelisien limpasan, fo, dalam kurun waktu yang ditinjau.

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Contact Name
Fiametta Ayu Purwandari

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fiametta@ugm.ac.id

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+6285712601130

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agritech@ugm.ac.id

Editorial Address
Faculty of Agricultural Technology, Universitas Gadjah Mada, Jl. Flora No. 1, Bulaksumur, Yogyakarta 55281, Indonesia

Location
Kab. sleman,

Daerah istimewa yogyakarta

INDONESIA

Abstract

Abstract

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Abstract

Abstract

Abstract

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Abstract

Home Page

OAI Link

Editorial Team

Contact

Reviewer

Google Scholar

Contact Name Fiametta Ayu Purwandari

Contact Email fiametta@ugm.ac.id

Phone +6285712601130

Journal Mail Official agritech@ugm.ac.id

Editorial Address Faculty of Agricultural Technology, Universitas Gadjah Mada, Jl. Flora No. 1, Bulaksumur, Yogyakarta 55281, Indonesia

Location Kab. sleman, Daerah istimewa yogyakarta INDONESIA

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Contact Name
Fiametta Ayu Purwandari

Contact Email
fiametta@ugm.ac.id

Phone
+6285712601130

Journal Mail Official
agritech@ugm.ac.id

Editorial Address
Faculty of Agricultural Technology, Universitas Gadjah Mada, Jl. Flora No. 1, Bulaksumur, Yogyakarta 55281, Indonesia

Location
Kab. sleman,

Daerah istimewa yogyakarta

INDONESIA