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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

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Analisis Kapasitas Kerja dan Kebutuhan Bahan Bakar Traktor Tangan Berdasarkan Variasi Pola Pengolahan Tanah, Kedalaman Pembajakan dan Kecepatan Kerja Zulias Mardinata; Zulkifli Zulkifli
agriTECH Vol 34, No 3 (2014)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Hand tractor is a type of tractor that is widely used especially in land cultivation by farmers in an effort to increase productivity. The result of land cultivation is inﬂ uenced by plowing depth and working speed, meanwhile the plowing depth and working speed inﬂ uence working capasity and fuel consumption. The aim of this research is to calculate need of fuel consumption and work capasity of hand tractor with single moldboard plow cultivate in various of tillage patterns, plowing depths, working speeds. The tillage patterns used in this research are returned closing and circle methods. This study uses a randomized block design (RBD) factorial. The ﬁ rst factor is the depth of plow consisting of 3 (three) standard treatments, namely: plowing depth 10 cm (D1), 15 cm (D2), 20 cm (D3). The second factor is the speed of the tractor consists of three (3) level of treatment that is: tractor forward speed of 0.83 m/s (V1), 1.25 m/s (V2), and 1, 67 m/s (V3). The parameters of this research are calculate fuel consumption and work capasity of each method with returned closing and circle method.The result showed that in plowing depth 10-20 cm and working capasity 0,83-1,67 m/s for cultivating an area of 1 ha with returned closing method is 2.066 l/hour, while the circle method is around 1,107 l/hour, and the interaction factor of working speed and plowing depth is 1,205 – 3,059 l/hours. The average of working capasity is 2,492 hours/ha, in circle method is 4,651 hours/ha, and interaction factor of working speed and plowing depth is 0,868–1,787 hours/ha. Working speed and plowing depth are liniear with fuel consumption and working capasity. The best method in order to efﬁ cient fuel consumption and maximum working capasity is the circle method.ABSTRAKTraktor tangan merupakan jenis traktor yang banyak digunakan khususnya dalam pengolahan tanah oleh para petani sebagai usaha untuk meningkatkan produktivitas. Hasil pengolahan tanah dipengaruhi oleh kedalaman pembajakan dan kecepatan kerja traktor, sementara kedalaman pembajakan dan kecepatan kerja berpengaruh terhadap kapasitas kerja dan kebutuhan bahan bakar. Tujuan dari penelitian ini adalah untuk menghitung besarnya kebutuhan bahan bakar dan kapasitas kerja traktor tangan dengan alat pengolah tanah bajak singkal tunggal dengan variasi pola pengolahan tanah, kedalaman pembajakan dan kecepatan kerja. Pola pengolahan yang digunakan adalah pola bolak-balik rapat dan pola berkeliling. Penelitian menggunakan Rancangan Acak Kelompok (RAK) faktorial. Faktor pertama adalah kedalaman bajak singkal yang terdiri dari 3 (tiga) taraf perlakuan yaitu : kedalaman bajak 10 cm (D1), 15 cm (D2), dan 20 cm (D3). Faktor kedua adalah kecepatan traktor terdiri dari 3 (tiga) taraf perlakuan yaitu: kecepatan maju traktor 0,83 m/s (V1), 1,25 m/s (V2), dan 1,67 m/s (V3). Adapun parameter diukur adalah konsumsi bahan bakar dan kapasitas kerja traktor tangan untuk masing-masing pola pengolahan tanah. Hasil penelitian diperoleh bahwa pada kedalaman pembajakan 10-20 cm dan kecepatan kerja 0,83-1,67 m/s untuk penyiapan lahan seluas 1 ha dengan pola bolak-balik rapat, kebutuhan bahan bakar rata-rata adalah 2,066 l/jam, pada pola berkeliling adalah 1,107 l/jam, dan dengan interaksi faktor kecepatan dengan kedalaman pembajakan adalah 1,205 – 3,059 l/jam. Kapasitas kerja rata-rata adalah 2,492 jam/ha, pada pola berkeliling adalah 4,651 jam/ha, dan interaksinya adalah 0,868 – 1,787 l/jam. Kecepatan dan kedalaman pembajakan berbanding lurus dengan konsumsi bahan bakar dan kapasitas kerja. Pola pengolahan tanah terbaik agar konsumsi bahan bakar eﬁ sien dan kapasitas kerja maksimal adalah pola berkeliling.

Sintetis secara Semi Kontinyu Biosurfaktan Ester Sorbitol Oleat Menggunakan Lipase Getah Pepaya Imobil Suhardi Suhardi; Tranggono Tranggono; Pudji Hastuti; M. Muchalal
agriTECH Vol 26, No 1 (2006)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Study on synthesis of sorbitol oleiate ester biosurfactan using Carica papaya latex immobilized-hpase as catalyst was caned out using oleic acid as a raw material. In the first step, process optimization for biosurfactan production was done with Carica papaya latex immobilized-lipase as acatalyst using a semi continuous methods. Lipase from Carica papaya latex was extracted using phosphate buffer pH 7.3 containing NaCI 0.1M then precipitated with addition of ammonium sulphate. Furthermore, the precipitated enzyme was solubilized in phosphate buffer pH 7.3, immobilized on Na-alginat (3%) and dried in freeze drier. Some variables for reaction were studied consisting of water concentration (20, 40, 60%), silica gel (0, 60, 120%) and reaction time (24,48,72 hours) with lipase concentration of 10%, and incubated at 45Â°C for those determined times and the acid value was monitored. In the second step, production of biosurfactant was also carried out using the semi-continuous methods, oleic acid and sorbitol were used as reactans and immobilzed-lipase of Carica papaya latex as a catalyst. Product fungsional properties were also determined including hydroxyl value, refraction index, melting point, fatty acid composition and HLB ( hydrophylic-lipophylic balance) value, surface tension and emulsifier characteristics. Result showed that : semi continuous production of sorbitol fatty acid ester with feed rate 0.1 ml per minute, temperature 45Â°C, 10% immobilized-lipse of Carica papaya latex, water: sorbitol ratio (40.16%), silica gel: water ratio (63.66%), sorbitol : oleic acid ratio (1:3 mol), incubation time 41.37 hours, resulted 54.96% product. The product characteristics were as follows : sorbitol oleiate acid ester content 70%, rendement 60%, hydroxil value 57 mg KOH/g, melting point 165Â°C, refractive index 1.4590, HLB value 7.5, surface tension 31.83 dyne/cm, capacity to keep emulsion (W/O) stability 140 minutes.

Biosintetis Etilen Luka pada Irisan Mesokarp Labu Kuning Murdijati Gardjito; Mochamad Adnan; Tranggono Tranggono
agriTECH Vol 26, No 1 (2006)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

The objectives of this study w to obtain new informations to complete the pathway in wounded ethylene biosynthesis and metabolism in the wound tissue of the mesocarp of the winter squash fruit. The samples were in the term of mesocarp cylinder showing the ratio of wound area and the tissue weight of 4.5 cm2/g and mesocarp disk for the ratio of 15.5 cne/g respectively. Experiments in this study were conducted in continuous phase of 44 hours using flowthrough system at 25Â°C. Analyses and measuremets were done for ethylene, 1 amino cyclopropane- 1 -carboxylic acid (ACC), malonil-ACC (MACC), HCN, phenolics, 1 amino cyclopropane-1 -carboxylic acid oxidase (ACC-oxidase), and a cyano alanine sythase (b-CAS) enzymes at certain time interval. The extent of ethylene production was directly related to the availability of its precusor (ACC) and ethylene-forming enzyme or ACC-oxidase. It was also found that no malonization of ACC occured during biosynthesis of wound ethylene. The result also indicated that the formation of wound ethylene was followed by the formation of cyanide-containing compounds with the similar pattern and an incrase in b-CAS activity suggesting cyanide detoxification in the tissue. Larger wound surface area ratio made the b-CAS activity was higher.

Etilen Luka, Aktivitas Enzim Peroksidase, Polifenol Oksidase, dan Fenil Alanin Liasepada Irisan Mesokarp Labu Kuning Murdijati Gardjito; Mochamad Adnan; Tranggono Tranggono
agriTECH Vol 26, No 1 (2006)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Winter squash fruit is a non-climateric fruit which produced very low ethylene as intact fruit but peeled or sliced mesocarp produced a considerably high wound-ethylene. In certain level of concentration, ethylene could induce various reaction in the wound tissue. This study has objectives of obtaining informations on the influence of wound ethylene on the activities of peroxidase (POD), polyphenol oxidase (PPO), and phenyl alanine ammonia lyase (PAL) which catalyze some physiological process related with the changes in colour, flavour, and taste in the wound fruit tissue or its products. Experiments in this study were conducted in continous phase of 44 hours using flowlhrough system at 25 Â°C. Analysis and measuremets were done for ethylene, POD, PPO, and PAL enzymes at certain time interval. The sample used were disks of 9 mm in deameter and 2 mm thickness and cylinders of 14 mm in deameter and 2 cm in heihgt. The Results of this study indicated that the presence of wound combined with the certain level of wound ethylene formation induced the POD enzyme activity. The PPO activity increased proportionally with the increased surface area ratio to the fresh weight of wounded tissue. PAL activity was only evident 3 hours after wounding. The PAL activity increased following the same pattern of wound ethylene formation. The larger the woundsurface area ratio to the fresh weight of the tissue, the more ethylene were produced, and the higher the activities of those enzymes. Various pretreatments could effectively suppress the formation of wound ethylene and lowered activities of those enzymes.

Karakteristik dan Studi Kasus Penerimaan Mi Sagu oleh Masyarakat di Sulawesi Selatan (Characteristics and Case Study of Sago Noodle's Acceptability by Consumer in South Sulawesi) Endang Y. Purwani; Y. Setiawaty; H. Setianto; Widaningrum Widaningrum
agriTECH Vol 26, No 1 (2006)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Noodle is the most popular product for the Indonesian people. It could be served conveniently without inferior image. Development of transparent noodle would promote consumption of saga Therefore, sago image as staple food would increase as superior as rice grain or wheat. The objectives of the research were to evaluate transparent noodle quality made from two types of sago starches and their acceptability by consumer (case: South Sulawesi). Noodle was prepared by mixing the thy sago starch with "binder" (completely gelatinized starch and additive) into dough. The dough was pressed manually through a container with holes in the base. Wet noodle was boiled in water and taken out of the water as soon as the strand floated, and were immediately transferred into cold water, and held before draining. Vegetable oil was added to avoid sticking. Sago (Metroxylon sago) starch were obtained from Pancasan Bogor and Palopo South Sulawesi, respectively. Noodle was then analyzed for quality and introduced to the consumers in South Sulawesi. They were represented by elementary school students (n=40), adults (n=40) and housewife (n=28). The result indicated that the physical characteristics of sago starch originated from Pancasan Bogor and Palopo were alike. However, they were different in term of starch pasting characteristics. Based on its raw material, Palopo starch showed the highest yield. Consumer's acceptability study indicated that transparent sago noodle was well accepted by more than 70% of consumers. The product contributed approximately of 7% of the daily calory intake (based on 2000 kkal RDI for Indonesian).

The Effect of Extraction Methods of White Saffron (Curcuma mangga Val.) on The Antioxidant Activity Dwiyati Pujimulyani; Agung Wazyka; Sri Anggrahini; Umar Santoso
agriTECH Vol 26, No 1 (2006)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

A study on the effect of white saffron to distilled water ratio on the antioxidant activity ofwhite saffron extract has been conducted. White saffron rhizome was blanched in the 0.5% citric acid solution at 100Cfor 5 min, and grated. The grated rhizome was extracted with distilled water at the ratio of 1: 1, 1:2, 1:3 and 1:4, respectively. The antioxidant activity of white saffron extract was assayed with Ferry Thyo Cyanate (FTC) and Thio Barbituric Acid (TBA) methods and compared with standard of BHA. The antioxidant activity ofwhite saffron extract expressed as % .inhibition, and the control (without added white saffron extract) was considered as having 0 % activity. Higher decrease of antioxidant activity was found with higher ratio of white saffi-on to distilled water. The highest antioxidant activity of white saffron extract (MC method 20.17% and TBA method 32.15%) was found in 1:1 ratio.

A Tofu Wastewater Treatment with A Combination of Anaerobic Baffled Reactor and Activated Sludge System Wagiman Wagiman; Ag. Suryandono
agriTECH Vol 26, No 1 (2006)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Tofu wastewater contained high organic matters and relatively fluctuated in Chemical Oxygen Demand (COD) of about 5.000 to 8.000 mg/L. A Combination of Anaerobic Baffled Reactor (ABR) and Activated Sludge System was very useful to reduce organic matter and produce higher quality effluent. The continuous operation mode was effective in treating the tofu wastewater at COD below 5.000 mg/L, while efficiency improvement was needed for COD 5.000 mg/L or more. The Batch operation mode might be applied but it should take 11 days hydraulic retention time to match the standard condition. The result also showed that at COD standard point of 100 mg/L, the nitrogen concentration decreased with 80-95 %. The nitrogen removal in the aerobic condition was observed most among other removals, because microorganisms took it as their matrix. In addition, there was an increase in pH from 5,0-6,0 to 7,0 â€“ 7,5 meaning thet there would be an improvement in effluent safety.

Pengaruh Gaya Pengepresan terhadap Perubahan Suhu Badan pada Pembuatan Tablet Effervescent Buah Markisa Ansar Ansar; Budi Rahardjo; Zuheid Noor; Suyitno Suyitno
agriTECH Vol 26, No 1 (2006)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Research about effect of compression force on material temperature change in the markisa fruit effervescent tablet has not been properly. So that the objectives of the research are (1) to the develop a mathematical models to predict change of material temperature and (2) to study variables influences to material temperatures during compression. The investigation was done by varying six variables are the high of material in punch, punch diameter, particles diameter, moisture contents, compress force, and test speed. The result of the research showed that change of material temperature during compression can be predict with mathematical equation of dimension analysis. To prove whether the sixth independent variables influence to dependent variable together, with used analysis of variants and the research showed that the F value (35.33) is greater than the F table (2.51). This indicated that the sixth independent variables more influences to change of material temperature during compression.

Pengaruh Spesies Zingiberaceae (Jahe, Temulawak, Kunyit, dan Kunyit Putih) dan Keetbalan Isiran Sebelum Pengeringan terhadap Kadar dan Aktivitas Antioksidan Ekstrak Aseton yang Dihasilkan Aisyah Tri Septiana; Mustaufik Mustaufik; Hidayah Dwiyanti; Deddy Muchtadi; Fransiska Zakaria; Maria Menu Ola
agriTECH Vol 26, No 2 (2006)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

This research was aimed to determine the influence ofzingiberaceae species and the influence ofslice thickness before drying process by using cabinet dryer to the antioxidant content (total phenolics and curcumin) and antioxidant activity (absorbance of peroxide and malonaldehide ). The results of the research showed that total phenolics of turmeric extract (216.57 ppm) and temulawak (190.41 ppm) > ginger (127,97 ppm) > white turmeric extract (31,13 ppm), where as curcumin content of turmeric (55,93 ppm) and temulawak extract (48,95 ppm) > white turmeric (6,51 ppm) and ginger extract (4,67 ppm). The antioxidant activity that is indicated peroxide and malonaldehide forming from 1 inoleic acid which is supplemented to temulawak extract, turmeric, and ginger extract > white turmeric extract. Turmeric, temulawak, and ginger extract had the antioxidant activity higher than tocopherol, where as white turmeric had lower antioxidant activity than a tocopherol. The slicing sample with slice size of 4 mm before drying process with cabinet dryer had rate and antioxidant activity better than that of 2 mm. The total phenolics of zingiberaceae extract with slice size of 4 mm (161,86 ppm) > 2 mm (121,18 ppm), and the curcumin content of zingiberaceae extract with slice of 4 mm (34,58 ppm) > 2 mm (23,45 ppm). The slice of 4 mm had a relatff higher value than the slice of 2 mm to the antioxidant activity zingiberaceae extract that is indicated peroxide and malonaldehide formation.

Mekanisme dan Kinetika Kuesing Aloe Emodin terhadap Fotooksida Asan Linoleat Yohana S. Kusuma Dewi; Tranggono Tranggono; Sri Raharjo; Pudji Hastuti
agriTECH Vol 26, No 2 (2006)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

To study the effects of methylene blue and aloe emodin on the photosensitized oxidation were prepared in methylene chloride systems. The oxidation of linoleic acid was determined by measuring the peroxide value. The quenching mechanism and kinetics of aloe emodin in methylene blue-sensitized photooxidation of linoleic acid were studied by the steady-state kinetic methods. The methylene blue consentration was produced signicantly increased of peroxide value on singlet oxygen oxydation of linoleic acid The effect of aloe emodin concentration on singlet oxygen oxidation of linoleic acid was produced signicantly decreased of peroxide value of linoleic acid.. The calculated quenching rate of aloe emodin was 4.68 x 109 11I1 S -1. Aloe emodin both of quenched singlet oxygen and sensitizer to reduce photosensitized oxidation of linoleic acid by the singlet oxygen quenching mechanism and the excited triplet oxygen sensitizer quenching mechanism. The ability of antiphotooxidant activity of aloe emodin was affected by concentration.

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Fiametta Ayu Purwandari

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agritech@ugm.ac.id

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

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Abstract

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Home Page

OAI Link

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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