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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 15 Documents
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Search results for , issue "Vol 38, No 1 (2018)" : 15 Documents clear
Kondisi Penyimpanan Kacang Tanah dan Potensi Cemaran Aspergillus flavus pada Pedagang Pengecer Pasar Tradisional di Wilayah Jakarta Widya Eka Prayitno; Harsi Dewantari Kusumaningrum; Hanifah Nuryani Lioe
agriTECH Vol 38, No 1 (2018)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (3811.375 KB) | DOI: 10.22146/agritech.26113

Abstract

Factors affecting contamination on peanut kernel marketed in Jakarta has not been investigated yet. The purpose of the research was to investigate and evaluate the storage condition and the behavior of retailers on the way of peanuts storage and also to investigate the presence of Aspergillus flavus infection in the peanuts. The research was conducted at traditional market with 15 peanut retailers as respondents (n=15). The research stages included survey at retailer area including interview, observation, temperature and relative humidity measurements as well as peanuts analysis including moisture content, defective seeds and presence of A. flavus. The results of research revealed that the average temperature of peanut storage area at retail stalls range from 29.6 to 31.2 °C which is not in accordance with the Codex Alimentarius Commission (CAC) recommendation, while the average of storage room RH ranged between 53.6–73.1% and moisture content of peanuts of 6.23–7.86% were mostly in accordance to CAC recommendation. The percentage of damage, shrivelled and splitted seeds ranged between 3.9–19.1%, 5.4–32.3% and 0.2–8.8%, respectively. The range of mean of total molds and A. flavus were 2.5–5.6 log cfu/g and 1.3–4.0 log cfu/g, respectively. Total molds had a strong correlation to damage kernels (r = 0.74), and had a moderate correlation to the temperature (r = 0.41), moisture content (r = 0.42) and behavior of retailers, especially in cleaning the ceiling (r = 0.44) and placing the storage container (r = 0.44). The presence of A. flavus had a slight correlation to relative humidity on storage (r = 0.26), and had no significant correlation to peanuts damage and all storage conditions. ABSTRAKFaktor-faktor yang mempengaruhi cemaran aflatoksin pada biji kacang tanah atau ose di wilayah Jakarta belum pernah dilaporkan. Penelitian ini dilakukan di pasar tradisional dengan 15 pedagang pengecer kacang tanah sebagai responden (n=15). Tujuan penelitian adalah mengidentifikasi dan mengevaluasi kondisi penyimpanan dan perilaku pengecer dalam menyimpan kacang tanah serta mengidentifikasi potensi cemaran Aspergillus flavus pada kacang tanah. Tahap penelitian meliputi survei di area pengecer (wawancara, pengamatan langsung dan pengukuran suhu serta kelembaban relatif (RH) di area penyimpanan) serta analisis kacang tanah (kadar air, biji cacat, dan keberadaan A. flavus). Hasil studi menunjukkan rata-rata kisaran suhu area penyimpanan kacang tanah di kios pengecer berkisar antara 29,6–31,2 °C. Hal ini tidak sesuai dengan rekomendasi Codex Alimentarius Commission (CAC), meskipun sebagian besar rata-rata kisaran RH area penyimpanan berkisar antara 53,6–73,1% dan kadar air kacang tanah sebesar 6,23–7,86% yang sesuai dengan rekomendasi CAC. Rata-rata biji rusak, biji keriput dan biji belah ditemukan pada kisaran, berturut-turut, 3,9-19,1%, 5,4–32,3% dan 0,2–8,8%. Rata-rata total kapang dan A. flavus pada sampel kacang tanah, masing-masing, ditemukan berkisar antara 2,5–5,6 log cfu/g dan 1,3–4,0 log cfu/g. Total kapang pada sampel kacang tanah memiliki korelasi positif yang kuat dengan biji rusak (r = 0,74), dan berkorelasi positif pada tingkat sedang dengan suhu (r = 0,41), kadar air (r = 0,42) dan perilaku pengecer dalam pembersihan langit-langit kios (r = 0,44) serta penempatan wadah simpan kacang tanah (r = 0,44). Studi ini menunjukkan bahwa keberadaan A. flavus pada sampel kacang tanah berkorelasi positif lemah dengan kelembaban relatif di area penyimpanan (r = 0,26) dan tidak memiliki korelasi secara signifikan dengan biji rusak maupun semua kondisi penyimpanan lainnya.  
Kinetika Reaksi Penurunan Kafein dan Asam Klorogenat Biji Kopi Robusta melalui Pengukusan Sistem Tertutup Sapto Kuncoro; Lilik Sutiarso; Joko Nugroho Wahyu Karyadi; Rudiati Evi Masithoh
agriTECH Vol 38, No 1 (2018)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (353.29 KB) | DOI: 10.22146/agritech.26469

Abstract

This study was aimed to examine the correlation between temperature and duration of steaming on caffeine and chlorogenic acid reduction as well as to determine energy activation (Ea) according to Arrhenius equation. About 750 g of Robusta coffee was steamed by autoclaving at 100, 110, 120 °C for 1, 2, 3, 4, 5, 6 and 7 hours. The study was conducted in 3 replications. Analyses of caffeine and chlorogenic acid were performed using HPLC.  Steaming coffee beans at 100, 110 and 120 °C resulted in the highest decrease of caffeine and chlorogenic acids content for 7 hours by 13%, 18% and 25% for caffeine; and by 37%, 50% and 59% for chlorogenic acids. At all temperatures investigated, decaffeination and chlorogenic acid reduction followed first order reaction. The decaffeination equation at 100 °C, 110 °C and  120 °C followed equation of  y = -0.019x + 0.862, y = -0.023x + 0.820, and y = -0.033x + 0.759, respectively. Meanwhile, the chlorogenic acid reduction at 100 °C, 110 °C,  and 120 °C followed equation of y = -0.071x + 1.421, y = -0.089x + 1.271, and y = -0.120x + 1.201. Activation energies of decaffeination and chlorogenic acid reduction were 33,543.66 kJ/mol K and 31,934.91 kJ/mol K, respectively. ABSTRAKPenelitian ini bertujuan untuk mengkaji hubungan antara suhu dan lama pengukusan terhadap penurunan kandungan kafein dan asam klorogenat serta menentukan energi aktivasi (Ea) dengan pendekatan persamaan Arrhenius. Biji kopi Robusta masing-masing seberat 750 g dikukus dalam autoklaf (sistem tertutup) pada suhu 100, 110, dan 120 °C masing-masing selama 1, 2, 3, 4, 5, 6, dan 7 jam. Penelitian dilakukan dengan 3 kali ulangan. Analisis kafein dan asam klorogenat dilakukan menggunakan HPLC. Pengukusan biji kopi pada suhu 100, 110, dan 120 °C, menghasilkan penurunan kandungan kafein dan asam klorogenat tertinggi pada pengukusan selama 7 jam. Penurunan kandungan kafein selama 7 jam pada suhu pengukusan 100, 110, dan 120 °C berturut-turut 13%, 18%, dan 25%. Kandungan asam klorogenat mengalami penurunan 37%, 50%, dan 59% berturut-turut pada suhu 100, 110, dan 120 °C.  Pada semua suhu yang diuji, penurunan kafein dan asam klorogenat mengikuti reaksi orde satu. Penurunan kafein mengikuti persamaan y = -0,019x + 0,862,  y = -0,023x + 0,820, dan y = -0,033x + 0,759, sedangkan untuk asam klorogenat mengikuti persamaan y = -0,071x + 1,421,  y = -0,089x + 1,271, dan y = -0,120x + 1,201. Besarnya energi aktivasi penurunan kafein dan asam klorogenat berturut turut adalah 33.543,66 kJ/molK dan 31.934,91 kJ/Mok.
Study of Beef Availability Potential in Yogyakarta Special Province (DIY) through Multi Criteria Analysis (MCA) Model by Spatial Geographic Information System Dwi Aulia Puspitaningrum; Masyhuri Masyhuri; Slamet Hartono; Jamhari Jamhari
agriTECH Vol 38, No 1 (2018)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (536.728 KB) | DOI: 10.22146/agritech.28888

Abstract

The increasing human population and income per capita in Indonesia have many impacts to the demand of food, not only staple food but also the secondary food too, including meat and beef demand. Based on data from Central Statistics Bureau of 1995–2016, beef demand in Indonesia has been increasing. This condition must be anticipated by preparing the supply, especially the availability of beef in Daerah Istimewa Yogyakarta province. In Yogyakarta city, one of the regencies of DIY, the demand rate grows by 3.2%/year, higher than the supply growth rate by 2.08 %/year.  This gap needs to be thought through the case of scarcity of beef on the market. This study aimed to identify the potential of supply in five parameters i.e.: beef population, the availability of semen for artificial insemination (IB), the availability of livestock feed plants (HMT), the number of cows that enter DIY, and the number of cows that exit from DIY. A model Spatial Geographic Information Systems (SGIS) has been used in this study. The study revealed the most potential area for the development of beef agribusiness, based on the availability side, was Gunung Kidul Regency, and the less potential was Yogyakarta municipality.
Karakterisasi dan Uji Stabilitas Digestif Nanoemulsi β-Karoten yang Dibuat dengan Metode Emulsifikasi Spontan Setyaningrum Ariviani; Windi Atmaka; Sri Raharjo
agriTECH Vol 38, No 1 (2018)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (32.172 KB) | DOI: 10.22146/agritech.29087

Abstract

β-Carotene exhibits a wide range of health benefits, but its application in food formulation is very limited because of its instability and susceptibility to degradation. The stability of β-carotene can be improved by incorporation into an oil-in-water (o/w) emulsions. The objective of this research was to characterize β-carotene loaded nanoemulsions prepared with spontaneous emulsification method using ternary food-grade surfactants (Tween 80, Span 40, Span 80) and palm oil or VCO (virgin coconut oil) as oil phase with the surfactant-oil ratio of 4. The physicochemical stability of β-carotene loaded nanoemulsions during simulated digestions, which consist of the mouth, stomach, and intestine phases, was also evaluated using in-vitro digestion model. The results showed that β-carotene loaded nanoemulsions, prepared either using VCO or palm oil as the oil phase, had neutral pH (6.8±0.1), mean particle diameter of 129 -159 nm, showed monomodal particle size distribution with low polydispersity index (PdI) values  (0.214 - 0.266), and were not significantly different in zeta potential values ([-6,59]–[-8,9]). The β-carotene loaded nanoemulsions with VCO as the oil phase had a smaller mean particle diameter than that of palm oil. The physical stability of the β-carotene loaded nanoemulsions against digestive simulation in the mouth, stomach or intestine phases was not influenced by the oil phase type.  Both nanoemulsions were stable against simulated digestion in the mouth and stomach phases. After passing through the intestinal phase, the mean particle diameter increased and the particle size distribution changed from monomodal to bimodal. The β-carotene retention after passing through the mouth, stomach and intestinal phases of the β-carotene loaded nanoemulsion prepared using VCO were not significantly different from the palm oil. ABSTRAKβ-Karoten mempunyai berbagai manfaat kesehatan, namun aplikasinya dalam formulasi pangan sangat terbatas karena tidak stabil dan mudah mengalami degradasi. Stabilitas β-karoten dapat ditingkatkan dengan menggabungkannya dalam sistem penghantaran berbasis emulsi minyak dalam air (o/w). Penelitian ini bertujuan untuk melakukan karakterisasi nanoemulsi β-karoten yang dibuat dengan metode emulsifikasi spontan menggunakan kombinasi tiga surfaktan food grade (Tween 80, Span 40, Span 80), minyak sawit maupun VCO (virgin coconut oil) sebagai fase minyak dengan rasio surfaktan-fase minyak 4.. Penelitian ini juga mengkaji stabilitas fisikokimiawi nanoemulsi β-karoten selama pencernaan di mulut, lambung dan usus dengan menggunakan model digesti in vitro. Hasil penelitian memperlihatkan bahwa nanoemulsi β-karoten yang dibuat dengan fase minyak VCO maupun minyak sawit memiliki pH netral (6,8±0,1), rerata diameter partikel 129–159 nm, distribusi ukuran partikel monomodal dengan nilai indeks polidispersitas (polydispersity index, PdI) rendah (0,214–0,266) dan zeta potensial yang tidak berbeda nyata ([-6,59]–[-8,9]). Nanoemulsi β-karoten dengan fase minyak VCO memiliki rerata diameter partikel yang lebih kecil dibanding minyak sawit sebagai fase minyak. Jenis fase minyak tidak berpengaruh terhadap stabilitas fisik nanoemulsi β-karoten selama simulasi pencernaan di mulut, lambung maupun usus. Nanoemulsi β-karoten dengan fase minyak VCO maupun minyak sawit stabil terhadap pencernaan di mulut maupun lambung. Setelah melewati fase usus, terjadi peningkatan diameter partikel rerata dan perubahan distribusi ukuran partikel dari monomodal menjadi bimodal. Retensi β-karoten dalam nanoemulsi VCO setelah melewati simulasi pencernaan mulut, lambung dilanjutkan fase usus tidak berbeda nyata dengan retensi β-karoten dalam nanoemulsi minyak sawit.
Karakteristik Fisikokimia Gelatin Tulang Ikan Patin (Pangasius sutchi) Hasil Ekstraksi Menggunakan Limbah Buah Nanas (Ananas comosus) Yoni Atma; Hisworo Ramdhani; Apon Zaenal Mustopa; Mega Pertiwi; Rizkia Maisarah
agriTECH Vol 38, No 1 (2018)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (289.597 KB) | DOI: 10.22146/agritech.29821

Abstract

Fish bones are the most potential as an alternative source for gelatin production. Pangasius catfish bone is the one of the most promising source due to its high yield of gelatin. It has similar gel strength with the commercial gelatin and has a low ash content. The aim of this research was to determine the physical and chemical characteristics of Pangasius catfish bone gelatin extracted using pineapple waste. Pineapple waste has a low pH and contains citric acid. The research was conducted in two stages i.e. gelatin extraction and physicochemical characterization. Gelatin extraction was done by pre-treatment and main extraction. Pre-treatment was done by soaking the fish bone into pineapple waste for 32, 48, and 56 hours. The main extraction was carried out by soaking fish ossein in warm water for 5 hours at 75 °C.  The sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) was used to analyze the gelatin existence. Fish bone gelatin has molecular weight ranging from 100-150 kDa and > 225 kDa. The hydroxyproline content of gelatin was 10.9–16.3 mg/g. Gelatin of Pangasius catfish bone extracted with pineapple waste has gel strength of 64.83 g.bloom g, hardness of 4.96 N, cohesiveness of 0.88, springiness of 1.03 mm, gumminess of 4.36 N, and chewiness of 2.78 N. Viscosity and pH of gelatin solution obtained were 3.17 cP and 4.52 respectively. The proximate characteristics obtained were moisture 8.59%, ash 0.95%, crude protein 47.60% and fat 7.71%. Some physicochemical parameters of gelatin resemble commercial gelatin and other fish bone gelatin. ABSTRAKTulang ikan merupakan salah satu sumber alternatif untuk produksi gelatin yang sangat potensial. Gelatin dari tulang ikan patin yang diekstrak dengan asam diketahui memiliki hasil ekstraksi yang tertinggi, kekuatan gel yang menyerupai gelatin komersial dan kadar abu yang rendah. Penelitian ini dilakukan untuk mengetahui karakteristik fisik dan kimiawi gelatin tulang ikan patin yang diekstrak dengan limbah buah nanas. Limbah buah nanas diketahui mengandung asam sitrat cukup tinggi. Penelitian dilakukan dengan dua tahap yakni ekstraksi gelatin dan analisis karakteristik fisikokimianya. Ekstraksi gelatin dilakukan dengan dua tahap yakni pre-treatment dan ekstraksi utama. Pre-treatment dilakukan dengan perendaman tulang ikan dalam limbah buah nanas selama 32, 48, dan 56 jam. Ekstraksi utama dilakukan dengan perendaman dalam air hangat selama 5 jam suhu 75 °C. Analisis keberadaan gelatin dengan metode SDS-PAGE diketahui gelatin berada pada kisaran berat molekul 100–150 kDa dan > 225 kDa. Kadar hidroksiprolin gelatin yakni 10,9–16,3 mg/g. Gelatin tulang ikan patin yang diekstrak dengan limbah buah nanas memiliki kekuatan gel 64,83 g.bloom, kekerasan (hardness) 4,96 g, kohesivitas (cohesiveness) 0,88, elastisitas (springiness) 1,03, kekenyalan (gumminess) 4,36, daya kunyah (chewiness) 2,78. Viskositas dan pH larutan gelatin yang diperoleh masing-masing 3,17 cP dan 4,52. Karakteristik kimiawi gelatin yang diperoleh antara lain meliputi kadar air 8,59%, abu 0,95%, protein kasar 47,60% dan lemak 7,71%. Beberapa karakteristik fisikokimia gelatin tulang ikan pada penelitian ini dapat dibandingkan dengan gelatin komersial dan gelatin tulang ikan yang lain.

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