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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 7 Documents
 1 
Search results for , issue "Vol 26, No 1 (2006)" : 7 Documents clear
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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (450.46 KB) | DOI: 10.22146/agritech.9466

Abstract

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 45°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 45°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 165°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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (289.104 KB) | DOI: 10.22146/agritech.9467

Abstract

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 25°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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (330.19 KB) | DOI: 10.22146/agritech.9468

Abstract

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 °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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (173.362 KB) | DOI: 10.22146/agritech.9469

Abstract

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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1282.462 KB) | DOI: 10.22146/agritech.9470

Abstract

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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1013.694 KB) | DOI: 10.22146/agritech.9471

Abstract

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 – 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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (813.024 KB) | DOI: 10.22146/agritech.9472

Abstract

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.

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