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Jurnal Teknologi Pertanian
Published by Universitas Brawijaya
ISSN : 14115131     EISSN : 25282794     DOI : -
Core Subject : Science, Agriculture,
Agriculture, Biological Sciences & Forestry Computer Science & IT
Jurnal Teknologi Pertanian diterbitkan oleh Fakultas Teknologi Pertanian Universitas Brawijaya untuk penyebarluasan hasil penelitian yang dilakukan oleh para peneliti dari dalam dan luar Fakultas Teknologi Pertanian Universitas Brawijaya. Jurnal Teknologi Pertanian terbit tiga kali dalam setahun, memuat tulisan hasil penelitian yang termasuk dalam lingkup disiplin ilmu pengetahuan yang terkait dengan Ilmu-ilmu Teknologi Pertanian guna menunjang pengembangan ilmu pengetahuan dan teknologi serta pembangunan nasional.
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Articles 578 Documents
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Kinetics Model of Tomato Quality Changes During Storage Masithoh, Rudiati Evi; Rahardjo, Budi; Sutiarso, Lilik; Harjoko, Agus
Jurnal Teknologi Pertanian Vol 14, No 1 (2013)
Publisher : Fakultas Teknologi Pertanian Universitas Brawijaya

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Abstract

This study aims at developing a kinetics model of changes in tomatoes quality during storage. Samples were stored at temperature of 6, 15, and 28 °C. Quality parameters measured were total carotene, citric acid, and vitamin C. On the development of kinetic models of quality parameter changes the k values of total carotenoids, citric acid, and vitamin C were 0.075, -0.008, and 0.042 at 6 °C, 0.056, -0.029, and 0.049 at 28 °C, as well as 0.125, -0.039, dan 0.044 at 28 °C, respectively. Activation energy of the decrease of citric acid was 47.91 kJ/mol, whereas for total carotene and vitamin C were 17.83 kJ/mol dan 0.96 kJ/mol. The coefficient of determination (R2) of the quality content between observation and prediction were 0.70-0.96. Keywords: Kinetics, total carotene, citric acid, vitamin C, tomato
Degradation of the oxirane ring of epoxidized oleic acid in a liquid catalyzed reaction system Wibowo, Tri Yogo; Rusmandana, Bayu; astuti, Astuti
Jurnal Teknologi Pertanian Vol 14, No 1 (2013)
Publisher : Fakultas Teknologi Pertanian Universitas Brawijaya

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Abstract

Epoxidized oleic acid was produced using acetic acid as a carrier of oxygen in liquid organic media. The attack on the oxirane ring by nucleophilic ion takes place in the epoxidation process with liquid catalyst, so decreased the yield of the epoxy. We report a study of degradation of oxirane ring influenced by the amount of sulfuric acid catalyst and addition time of hexane on the epoxidation reaction of oleic acid with hydrogen peroxide. The results show that increasing amount of sulfuric acid catalyst not only can increase rate of reaction but also can affect degradation of epoxide increased. On the process conditions: temperature of 50-55 ºC; mole ratio of oleic acid: acetic acid: hydrogen peroxide = 1 : 0.4 : 1.5; and stirrer speed of 1200 rpm, the amount obtained by sulfuric acid catalyst is best at 3.5% which can result in a number epoksid oxirane and iodine numbers are 3.15 and 4.66, respectively. Meanwhile, the hexane addition did not influence on the reaction rate of double bond cleavage, however the hexane addition at the right time can decrease the degradation of oxirane ring. The addition of a 125 g hexane at the first hour gave the degradation oxirane low at 50%. Keywords: oleic acid, epoxide, oxirane ring, degradation
The Green Betel Leaves for Inhibiting Fat Oxidation of Smoked Seasoned Catfish Fillets Wulandari, Dwi Retno; Ekantari, Nurfitri; Husni, Amir
Jurnal Teknologi Pertanian Vol 14, No 1 (2013)
Publisher : Fakultas Teknologi Pertanian Universitas Brawijaya

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Abstract

The aim of this study was to determine the effect of added betel leaves towards fat oxidation on smoked seasoned catfish fillets during storage. This study consisted of seven treatments, there were control (without added of spices, liquid smoke, and betel leaves powder), the added spices, liquid smoke, and also the combination of added spices, liquid smoke, betel leaves powder at various concentration of betel leaves powder (0.05, 1, 5, and 10%). The spices and soy sauce were dissolved in water and used to dissolve betel leaves powder. The order of smoked seasoned catfish fillets were soaked in a spice solution and betel leaves powder for 2 hours and then drained for 5 hours at 5 °C, and dipped in liquid smoke 10% (v/v) for 1 minute, then cooked in oven at 75 °C for 6 hours, cooled and packed (0.8 mm polypropylene plastic). The result showed that the betel leaves powder and spices interacted synergistically to inhibit fat oxidation and increased shelf life of smoked seasoned catfish fillets until the six days of storage. Added betel leaves powder could inhibit fat oxidation, peroxide value content varied 12.16 to 14.14 mgeq/1000 g, lower than control (13.53 to 14.09 mgeq/1000 g). Added 1% betel leaves powder was the most preferred smoked seasoned catfish fillets by consumers test, however it induced darker color, harder texture, and could covered up the smell of smoked on product. Keywords: shelf life, betel leaves, smoked seasoned catfish fillets, oxidation
Purification of Phage Cocktail and its Inhibition Spectrum to Foodborne Disease Bacteria Nindita, Lia Oriana; Wardani, Agustin Krisna
Jurnal Teknologi Pertanian Vol 14, No 1 (2013)
Publisher : Fakultas Teknologi Pertanian Universitas Brawijaya

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Abstract

The aim of this research is to purify a phage cocktail to obtain a single phage and evaluate the broad host range of a single phage. The obtained single phage (ФLA-1), was found to attack strains of Shigella flexneri, Shigella dysentri, Eschericia coli, Salmonella thypi, and Listeria monocytogenes, but not members of the strains Staphylococcus aureus, Bacillus cereus and Lactobacillus plantarum. The data showed that ФLA-1 is more  effective to attack the Shigella flexneri than other strain with the burst size of 1.37.108 PFU/ml. It  can reduced the cell numbers of their positive bacteria targets after 8 hr. The complete nucleotide sequence of the genome 21226 basepairs of фLA-1 was determined. Keywords: purification, phage cocktail, plaque, pathogen bacteria, foofdborne disease
The Evaluation of Occupational Safety and Health Based on Employee Behavior Aspect in Production Process at Pabrik Gondorukem and Terpentin Rejowinangun – Trenggalek Lutfi, Musthofa; Nugroho, Wahyunanto Agung; Prasetyo, Ary Drajad
Jurnal Teknologi Pertanian Vol 14, No 1 (2013)
Publisher : Fakultas Teknologi Pertanian Universitas Brawijaya

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Abstract

Occupational health and safety is important to avoid accident in production process. Pabrik Gondorukem and Terpentin (PGT) Rejowinangun is a factory that processes pine latex to produce gondorukem and terpentin that have high levels of workplace accidents. In this study, occupational health and safety evaluation performed by evaluate facility, workroom, working condition, and health and working safety implement at sectioned production process corresponds to behaviour aspect and employ safety default then give remedial recommendation proposal job on work area of that evaluation result. Study result show that amelioration of working location in Pabrik Gondorukem and Terpentin is required to improve occupational health and safety. Dangerous employee behavior such as the employee awareness to wear safety equipment, cleanliness of the area and company safety and health management is need to be improved. Keywords: ergonomic, gondorukem, occupational health and safety
Utilization of Nypa (Nypa fruticans) Bark for Making Biocharcoal Briquette as Alternative of Energy Sources Mulyadi, Arie Febrianto; Dewi, Ika Atsari; Deoranto, Panji
Jurnal Teknologi Pertanian Vol 14, No 1 (2013)
Publisher : Fakultas Teknologi Pertanian Universitas Brawijaya

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Abstract

This research aim are to get combination of the best treatment between the amount of tapioca glue and lime as additional material to be able to produce charcoal briquette which is able to be taken the beneficial  as alternative energy source, and to know production price which needed in making leaf sugarcane biocharcoal briquette.  The experiment for this research is Completely Randomized Block Design with 2 factors;, they are concentration of Tapioca glue (P) and Concentration of lime as additional material (K). Each of the factors has three levels, they are: P1 (20 %), P2 (30 %), and P3 (40 %); K1 (1%), K2 (3%), K3 (5%) which are repeated twice. Product yield, water content, endurance press, heat value, and ash content are analysed on this reserach. The best treatment is on biocharcoal briquette with the tapioca glue is 20% and lime is 5% with product yield is 78.04%, water content is 4.10%, the endurance press is 157.57 kg/cm2, heat value  is 2753.71 cal/g, and ash content is 22.35%. The result of production analysis show the base price of the product is Rp. 1120.00/ kilogram. The price of product sold is Rp. 1700/ kilogram with profit expectation is 40 so that the BEP value (unit) is 11986.03 kilograms or Rp.18224978.07. Keywords: biocharcoal, briquette, lime, nypa bark, tapioca.
Extraction and Characterization of the Water Soluble Polysaccharides from Coffee Pulp of Arabica (Coffea arabica) and Robusta (Coffea canephora) Variety Diniyah, Nurud; nafi', Ahmad; Sulistia, Demi; Subagio, Achmad
Jurnal Teknologi Pertanian Vol 14, No 2 (2013)
Publisher : Fakultas Teknologi Pertanian Universitas Brawijaya

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Abstract

The research was aimed to extract and characterize water soluble polysaccharides (WSP) from coffee pulp of arabica and robusta variety. The effect of extraction temperature i.e 80 and 90 °C on properties of WSP was investigated. The results showed that WSP produced from coffea robusta in combination with 90 °C of extraction temperature was the best treatment. It yielded WSP of 10.98%, brigthness (L*) of 61.52. This WSP contained water, protein, ash, total sugar and pectin of 8.92%, 16.07%, 13.01%;  13.54%, and  57.24% respectively.
Antioxidan activity of Sargassum duplicatum seaweed extract Septiana, Aisyah Tri; Asnani, Ari
Jurnal Teknologi Pertanian Vol 14, No 2 (2013)
Publisher : Fakultas Teknologi Pertanian Universitas Brawijaya

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Abstract

Sargassum duplicatum contains bioactive compounds that potential as antioxidants. The aims of the research were to study the antioxidant activity of S. duplicatum’s extract obtained from solvent extraction by one-step extraction and multi-step extraction methods. Solvents used were hexanes, ethyl acetate, methanol, ethanol, and water. Antioxidant activity of extract was measured by analyzing the peroxide value, malonaldehide (MDA) from linoleic acid dan 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenger capacity. The result showed that the extract of S. duplicatum could inhibit linoleic acid oxidation and scavenge free radical. Antioxidant activity on linoleic acid of methanol extract from one-step extraction method was the highest, whereas antioxidant activity of ethanol and ethyl acetate extracts was not significantly different. Methanol extract from one step extraction could inhibit peroxide formation by 86.4%, and MDA formation by 77.5%. As reference, α tocopherol inhibited peroxide formation by 89.1% and MDA formation by 60.6%. The DPPH radical scavenger capacity of all extracts of S. duplicatum was lower than α tocopherol.  Activity of antioxidant of those extracts was closely related to their total phenolic content.Key words: Extraction, antioxidant, Sargassum duplicatum
Modification and Performance Test of A Tube Type Pressure Stove using Jatropha curcas Oil Fuel Fatah, Gatot Suharto Abdul; Hastono, Abi D.; soebandi, Soebandi
Jurnal Teknologi Pertanian Vol 14, No 2 (2013)
Publisher : Fakultas Teknologi Pertanian Universitas Brawijaya

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Abstract

Energy crisis is a problem that still has not been fully resolved. Kerosene as one of the main source of energy for daily cooking is relatively expensive. It can cost up to Rp. 8000,-/L. Although energy conversion from kerosene to LPG has been carried out by the government of Indonesia, but some users still prefer kerosene for security reasons. Until now, pressure stove or kerosene-fueled stoves commonly called tube type are still used by users to fry fried foods. By modifying mainly on the part of the wind shield tube it is spected that presure stove tube type can be used bio oil. Some bio-oil which come from jatropha curcas, cottonseed oil and kapok oil have potential to be used as bio fuel. The aim of the research and modification was to get pressure stoves prototype by using bio-oil by modification of pressure stoves as a substition of kerosene pressure stoves. The result of modification and engineering of pressure stoves, could be got some prototypes pressure stoves that was pressure stove tube type. The result performance test is done using jatropha oil as follows : fuel consumption 1250 mL/ hour; pre-heating 17 minutes; boiling time of 2 litre of water 5 minutes; the noise levels was 88.2 dB and the flame colour was reddish blue.Keywords: modification, pressure stove, Jatropha curcas, fuel oil.
Analysis of the Occupational Health and Safety Effects on Productivity of Employees using Partial Least Squares Methods Ukhisia, Bella Gloria; Astuti, Retno; Hidayat, Arief
Jurnal Teknologi Pertanian Vol 14, No 2 (2013)
Publisher : Fakultas Teknologi Pertanian Universitas Brawijaya

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Abstract

Occupational safety and health is one of the important factors that can affect employees’ productivity. Risk of accidents and occupational diseases often occur because the occupational safety and health program is not performing properly which can have an impact on the level of employees’ productivity. The aims of the research were to determine the effect of occupational safety variable and occupational health variable on employees’ productivity, and occupational safety on occupational health at installation division of PG Krebet Baru II Malang. The study was conducted at the installation division of the PG Krebet Baru II Malang using sample size of 60 people. Variables used in this study consisted of two types, i.e. latent variables and indicator variables. Data were collected using a questionnaire which was consisted of questions include all research variables and the response was measured using a Likert scale. The data then were analyzed by partial least squares method using software SmartPLS ver 2 for windows. The results showed that the occupational safety variable with regression coefficient 0.137 did not give a significant impact on employees’ productivity. Occupational health variable with regression coefficient 0.258 gave a significant impact on employees’ productivity. Safety variable with regression coefficient 0.587 gave a significant impact on occupational health. It can be concluded that occupational safety did not give a directly significant effect on employees’ productivity, occupational safety indirectly affect employees’ productivity through occupational health, occupational health directly gave a significant impact on productivity of employees.Keywords: Occupational health and safety, Partial Least Squares, Productivity

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