cover
Contact Name
Rachma Wikandari
Contact Email
rachma_wikandari@mail.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
agriTECH
ISSN : 02160455     EISSN : 25273825     DOI : 10.22146/agritech
Core Subject : Agriculture,
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).
Articles 15 Documents
Search results for , issue "Vol 36, No 1 (2016)" : 15 Documents clear
Karakteristik Fisikokimia Tepung Koro Pedang (Canavalia ensiformis) Termodifikasi dengan Variasi Konsentrasi Asam Laktat dan Lama Perendaman Achmad Ridwan Ariyantoro; Dian Rachmawanti; Imro'ah Ikarini
agriTECH Vol 36, No 1 (2016)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (408.139 KB) | DOI: 10.22146/agritech.10675

Abstract

This study was aimed to investigated physicochemical characteristic of modified jack bean flour (Canavalia ensiformis) with  various lactic acid concentration and soaking time. This study used factorial random design with two factors: lactic acid concentration (0.5%, 1%, 1.5%) and soaking time (30 and 60 minutes) with three sample repetition and two analysis repetition. The result of study showed that increased lactic acid concentration and soaking time could increased amylose content, water absorption capacity, solubility, swelling pawer, and whiteness degree of jack bean flour modified, but decereased the moisture content and protein content of jack bean flour modified.ABSTRAKPenelitian  ini  bertujuan  untuk  mengetahui  karakteristik fisikokimia tepung  koro  pedang  (Canavalia  ensifarmis) termodifikasi yang dihasilkan dari pemberian perlakuan asam laktat berbagai konsentrasi dan lama perendaman. Penelitian ini menggunakan  rancangan  acak  faktorial  dengan  dua  faktor yaitu konsentrasi asam laktat (0,5%, 1%, 1,5%) dan lama perendaman (30 menit dan 60 menit) dengan 3 kali ulangan sampel dan 2 kali ulangan analisis. Hasil penelitian menyatakan bahwa semakin besar konsentrasi asam laktat dan semakin lama waktu perendaman cenderung meningkatkan kandungan amilosa, daya serap air, kelarutan, swelling pawer, dan derajat putih tepung koro pedang termodifikasi, namun menurunkan kadar air dan kadar protein tepung koro pedang termodifikasi.            
Potensi Probiotik Indigenus Lactobacillus plantarum Dad 13 pada Yogurt dengan Suplementasi Ekstrak Ubi Jalar Ungu untuk Penurun Diare dan Radikal Bebas Agustina Intan Niken Tari; Catur Budi Handayani; Sudarmi Sudarmi
agriTECH Vol 36, No 1 (2016)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (419.312 KB) | DOI: 10.22146/agritech.10677

Abstract

The purpose of this study was studying the effectiveness of selected indigenous probiotic strains (Lactobacillus plantarum Dad 13) in yoghurt with purple sweet potato extract suplementation as reducing diarrhea and free radicals on white rats albino Norway rats (Rattus novergicus) Sprague dawley strain. The study was designed using factorial completely randomized design, with treatment of purple sweet potato extract yogurt without probiotics (P0), purple sweet potato extract yogurt with probiotic (P1) to 2 groups of male Sprague dawley rats were treated without Enteropathogenik Escherichia coli (EPEC) ATCC 35218 (E0) and with Enteropathogenik Escherichia coli (EPEC) ATCC 35218 (E1). Probiotic treatment was conducted using the sonde at day 1st to 21st at a dose of 1 ml / 120 g weight or average 109 CFU/ ml. While the treatment of EPEC ATCC 35218 was conducted using the sonde at dose of 106 CFU/ml on day 7th to 14th. The observed parameters include fecal water content, water content of cecum, malonaldehide levels (MDA) blood and liver. The results showed that (1) There was interaction between the treatment of indigenous probiotic yogurt purple sweet potato extract and EPEC ATCC 35218 on water content of faecal, water content of cecum, MDA levels blood and liver (2).Culture of Lactobacillus plantarum Dad 13 was able to provide health effects as reducing of diarrhea and free radicals.ABSTRAKPenelitian bertujuan mempelajari efektivitas strain probiotik indigenus terpilih (Lactobacillus plantarum Dad 13) pada yogurt dengan suplementasi ekstrak ubi jalar ungu sebagai penurun diare dan radikal bebas pada tikus putih albino Norway rats (Rattus novergicus) galur Sprague dawley. Penelitian dirancang menggunakan rancangan acak lengkap faktorial, dengan perlakuan yogurt ekstrak ubi jalar ungu tanpa probiotik (P0), yogurt ekstrak ubi jalar ungu dengan probiotik (P1) terhadap 2 kelompok tikus Sprague dawley jantan yang diberi perlakuan tanpa enteropathogenik Escherichia coli (EPEC) ATCC 35218 (E0) maupun dengan enteropathogenik Escherichia coli (EPEC) ATCC 35218 (E1). Pemberian probiotik dilakukan dengan metode sonde pada hari ke-1 sampai 21 dengan dosis 1 ml/ 120 g BB tikus percobaan atau rata-rata 109 CFU/ml. Sedangkan perlakuan EPEC ATCC 35218 dilakukan dengan metode sonde sebanyak 106  CFU/ml pada hari ke 7 sampai ke 14. Parameter yang diamati meliputi kadar air feses, kadar air sekum, kadar malonaldehide (MDA) darah dan hati. Hasil penelitian menunjukkan bahwa (1). Terdapat interaksi perlakuan antara pemberian EPEC ATCC 35218 dan probiotik indigenous pada yogurt ekstrak ubi jalar ungu terhadap kadar air feses, kadar air sekum, kadar MDA darah dan kadar MDA hati tikus uji. (2). Kultur Lactobacillus plantarum Dad 13 yang ditambahkan pada yogurt ekstrak ubi jalar ungu mampu memberi efek kesehatan sebagai penurun diare dan radikal bebas.
Optimasi Formula dan Struktur Mikroskopik Pasta Bebas Gluten Berbahan Dasar Puree Ubi Jalar Ungu dan Tepung Kacang Hijau Ira Mulyawanti; Slamet Budijanto; Sedarnawati Yasni
agriTECH Vol 36, No 1 (2016)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1031.124 KB) | DOI: 10.22146/agritech.10678

Abstract

The aim of this study was to optimize gluten free pasta formula made from purple sweet potato puree and mung bean flour. Aplication of a mixture design allowed to find the optimal composition to achieve the desirable characteristic. The results showed that the optimal formula was mixture of 45.25% purple sweet potato puree and 51.75% mung bean flour. The characteristics of the chosen formula were springiness of 2.29 mm, 0.38 cohesiveness, cooking loss 17.62%,333.48 ͼHue, Ie   20.59%, and 42.42 mg/L anthocyanin content. Microscopic structure showed that cooked pasta with purple sweet potato puree composition below 50% in the formula had a solid texture appearance.ABSTRAKPenelitian bertujuan untuk mengoptimasi formula pasta bebas gluten berbahan dasar puree ubi jalar ungu dan tepung kacang hijau. Aplikasi mixture design dalam optimasi formula dapat menghasilkan formula yang optimal dengan karakteristik produk sesuai dengan yang diinginkan. Hasil penelitian menunjukkan bahwa komposisi optimal puree ubi jalar ungu dengan tepung kacang hijau dalam formula adalah 45,25% puree ubi jalar ungu dan 51,75% tepung kacang hijau. Pada komposisi tersebut dihasilkan pasta ubi jalar ungu dengan karakteristik yaitu kekenyalan 2,29 mm, cohesiveness 0,38, KKP 17,62%, warna 333,48, Ie   20,59%, dan kandungan antosianin 42,42 mg/L. Dari segi mikroskopik, pasta ubi jalar ungu matang dengan rasio puree ubi jalar ungu dengan formula di bawah 50% sudah menunjukkan adanya struktur yang kompak.
Formulasi Pangan Darurat Berbentuk Food Bars Berbasis Tepung Millet Putih (Panicum milliaceum L.) dan Tepung Kacang Merah (Phaseolus vulgaris L.) Raden Baskara Katri Anandito; Siswanti Siswanti; Edhi Nurhartadi; Rini Hapsari
agriTECH Vol 36, No 1 (2016)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (499.899 KB) | DOI: 10.22146/agritech.10680

Abstract

This study aimed to obtain a formula emergency food in the form food bars made from white millet flour and red bean flour. Foodbars made with Intermediate Moisture Food (IMF) technology with wet dyeing technique. This study used completely randomized design (CRD), which consists of a single factor, namely the variation formula white millet flour and red bean flour. The results showed that the formula food bars with the highest level of consumer acceptance in the composition of 15 g of white millet flour, red bean flour 10 g, 2 g sugar, 10 g margarine, milk full cream 13 g, 6.043 g and the addition of water. In 100 g of food bars contained water, ash, protein, fat, carbohydrate, and caloric value a respectively of 16.45%, 1.45%, 10.99%, 35.39%, 42.26%, 0 , 81 and 233.80 kcallbar.ABSTRAKPenelitian ini bertujuan untuk memperoleh formula pangan darurat berbentuk food bars berbahan dasar tepung millet putih dan tepung kacang merah. Food bars dibuat dengan teknologi Intermediate Moisture Food (IMF) dengan teknik pencelupan basah. Penelitian ini menggunakan Rancangan Acak Lengkap (RAL) yang terdiri dari satu faktor yaitu variasi formula tepung millet putih dan tepung kacang merah (15:10; 12,5:12,5; 10:15). Hasil penelitian menunjukkan bahwa formula food bars dengan tingkat penerimaan konsumen tertinggi pada komposisi tepung millet putih 15 g, tepung kacang merah 10 g, gula halus 2 g, margarine 10 g, susu full cream 13 g, dan penambahan air 6,043 g. Dalam 100 g food bars terkandung air, abu, protein, lemak, karbohidrat nilai a  dan kalori berturut-turut sebesar 16,45%,1,45%, 10,99%, 35,39%, 42,26%, 0,81 dan 233,80 kkallbar.
Aktivitas Antioksidan Ekstrak Biji Duwet (Syzygium cumini Linn.) pada Peroksidasi Lipida Secara In Vitro Rohadi Rohadi; Sri Rahadjo; Iip Izul Falah; Umar Santoso
agriTECH Vol 36, No 1 (2016)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (428.064 KB) | DOI: 10.22146/agritech.10681

Abstract

All parts of Syzygium cumini Linn. (duwet) were widely used for medicinal plant in the treatment of various deseases. The seed extract was used to lower blood glucose. Cumini's seed had higher phenolic fractions than others. It were prepared by extracted of duwet seed "Genthong" varieties, using various extractants such as 85% ethyl acetate, 50% methanol and 50% ethanol. Duwet seed extract collected then was determined of phenolics compound and antioxidant activity assayed by measuring 2,2-diphenyl-1-picrylhydrazylradical (DPPH) scavenging activity, reducing Ferric ion (Fe3+) power and inhibition of linoleic acid oxidation. The objective was to select one of the extractant which gave highest yield and polyphenolic content and its stronger antioxidant activity. Extractant 50% methanol gave highest the extract yields was 16.29 % (db.) and phenolics compounds of extract was composed: total phenolic 45.99±0.25 g-GAE/100 g-extract; total flavonoid 2.28±0.07 g-QE/100 g-extract and total tannin 26.9±0.07 g-TAE/100 g-extract. All of extract exhibited strong on behalf of RSA-DPPH assay 87-95% (100  g-mL-l) and reducing power, nevertheless in inhibition of linoleic acid oxidation was moderate 49-55% (400  g-mL-l).ABSTRAKTanaman duwet (Syzygium cumini Linn.) pada semua kompartemennya dimanfaatkan masyarakat untuk pengobatan suatu penyakit. Ekstrak bijinya dimanfaatkan untuk penurun gula darah. Bijinya merupakan bagian tanaman yang kaya senyawa polifenol. Fraksi kaya senyawa fenolik dipreparasi dengan mengekstraksi biji duwet varietas "Genthong", dengan tiga jenis ekstraktan; etil acetat 85%, metanol 50% dan etanol 50%. Ekstrak biji duwet (EBD) yang diperoleh dianalisis kelompok senyawa fenolik dan aktivitas antioksidan menggunakan metode uji penangkapan radikal DPPH (2,2-diphenil 1-picrylhydrazyl), uji reduksi ion Feri (ferric reduction antioxidant power-FRAP) dan uji penghambatan peroksidasi asam lemak linoleat. Tujuan penelitian adalah memilih satu dari tiga ekstraktan yang menghasilkaan ekstrak, dengan yield dan kadar senyawa polifenolik terbesar serta sifat antioksidatif terkuat. Yield dengan ekstraktan Met-OH-50%, sebesar 16,29% (db), senyawa fenoliknya sebesar 45,99 ±0,25 g-GAE/100 g-EBD; 2,28±0,07 g-QE/100 g-EBD dan 26,9±0,07 g-TAE/100 g-EBD. Ketiga ekstrak kuat dalam uji penangkapan radikal DPPH antara 87-95 % (100 g-mL-l) dan uji reduksi ion Feri (Fe3+), moderat pada uji penghambatan peroksidasi lipid, 49-52 % pada 400  g- mL-l.
Pengaruh Rasio Mol Reaktan dan Lama Sulfonasi terhadap Karakteristik Methyl Ester Sulfonic (MES) dari Metil Ester Minyak Sawit Sri Hidayati; Pudji Permadi; Hestuti Eni
agriTECH Vol 36, No 1 (2016)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (445.96 KB) | DOI: 10.22146/agritech.10682

Abstract

An experiment of sulfonation process of methyl ester to produce methyl ester sulfonates (MES) was caried out using methyl ester palm oil in factorial design and NaHSO as sulfonating agent with variation of ratio mol NaHSO : methyl ester (1:1.25, 1:1.5, 1:1.75 and 1:2 ) and sulfonation time (3 hour (L1), 4.5 hour (L2) and 6 hour (L3). The result showed that the best sulfonation condition present in 1:1,5 mol ratio and sulfonation time of 4,5 hour. The best characteristic of MES was produced emulsion stability of 68.25%, acid value of 2.57 mg KOH/g, iod value 10.91 g 1od/100 g sample, interfacial tension of 1.806 dyne/cm at MES concentration of 1% (w/w). The optimal salinity occured at concentration of 20.000 ppm which 1FT value of 0.0055 dyne/cm. Heating at a temperature of 800 C for 30 days with the addition of 2 3.ABSTRAKSebuah penelitian tentang proses produksi metil ester sulfonat menggunakan bahan baku metil ester minyak kelapa sawit dilakukan secara faktorial menggunakan NaHSO sebagai agen pensulfonasi dengan variasi rasio mol NaHSO 1:1,25, 1:1,5, 1:1,75 dan 1:2 dan lama sulfonasi.dengan variasi 3; 45; dan 6 jam. Hasil penelitian menunjukkan bahwa kondisi proses sulfonasi terbaik terdapat pada rasio metil ester dan mol reaktan 1:1,5 dan  lama reaksi  4,5 jam dan suhu reaksi lOOoC yang menghasilkan nilai stabilitas emulsi 68,25%, bilangan asam 2,57 mg KOH/g sampel, bilangan iod 10,91 g 1od/100 g sampel. Konsentrasi metil ester sulfonat MES terbaik untuk menghasilkan 1FT terendah adalah 1% (b/b) yaitu 1,806 dyne/cm, salinitas optimal terjadi pada 20.000 ppm NaCl dengan nilai 1FT 0,0055 dyne/cm. 0,098 dyne/cm.
Kandungan Gizi, Rendemen Tepung, dan Kadar Fenol Total Alpukat (Persea americana, Mill) Varietas Ijo Panjang dan Ijo Bundar Wuri Marsigit; Mary Astuti; Sri Anggrahini; Sri Naruki
agriTECH Vol 36, No 1 (2016)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (743.269 KB) | DOI: 10.22146/agritech.10683

Abstract

The aims of the study were to determine pulp proportion, dried pulp rendement, nutrient dan  total phenolic content avocado variety of Ijo Panjang dan Ijo Bundar. Variety of Ijo Panjang and Ijo Bundar were selected because both of varieties were categorized as excelent varities and recomendedto develop in Indonesia. Water, carbohydrate, protein, fat dan ash content were determined by using proxymate analysis (AOAC), vitamin A dan E using spectrophotometry method, vitamin C using titration method, dan minerals using AAS method. Total phenolic content were determined by using Follin-Cialcetau method. The result of the studies found that pulp portion Ijo Bundar Variety higher than Ijo Panjang. Water content dan zinc of Ijo Panjang variety higher than Ijo Bundar. Dried pulp rendement of Ijo Bundar higher than Ijo Panjang. Protein, fat,  ash, minerals (Fe, Na, K dan P) avocado variety of Ijo Bundar higher than Ijo Panjang. Magnesium dan mangan content of both varieties have not significant different. Total phenolic content of pulp dan dried pulp were higher in Ijo Bundar than Ijo Bundar.ABSTRAKPenelitian ini bertujuan untuk mengetahui proporsi daging buah, rendemen tepung, kandungan gizi dan fenol total alpukat varietas Ijo Panjang dan Ijo Bundar. Pemilihan kedua varietas tersebut karena merupakan varietas unggul dan direkomendasikan untuk dikembangkan di Indonesia. Kandungan, air, karbohidat, protein, lemak dan abu dilakukan dengan analisis proksimat (AOAC), kandungan vitamin A dan E dengan metode spektrofotometri dan vitamin C dengan metode titrasi, analisis mineral dengan metode AAS. Total fenol dianalisis dengan metode Folin-Ciocalteu. Hasil penelitian menunjukan bahwa proporsi daging buah, kadar air, seng varietas Ijo Panjang lebih tinggi dibandingkan Ijo Bundar. Rendemen tepung alpukat lebih tinggi pada varietas Ijo Bundar. Kandungan protein, lemak, abu, vitamin (A,E dan C), mineral (Fe, Na, K, P) lebih tinggi pada varietas Ijo Bundar. Kandungan magnesium dan mangan tidak terdapat perbedaan signifikan kedua varietas.  Fenol total daging buah dan tepung alpukat lebih tinggi pada varietas Ijo Bundar dibandingkan Ijo Panjang.
Pengaruh Fermentasi terhadap Kandungan Protein dan Asam Amino pada Tepung Gaplek yang Difortifikasi Tepung Kedelai (Glycine max (L)) Yohanes Martono; Lucia Devi Danriani; Sri Hartini
agriTECH Vol 36, No 1 (2016)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (830.085 KB) | DOI: 10.22146/agritech.10684

Abstract

Enhancement of proteins and enrichment of amino acids of dried cassava flour can be carried out by fermentation of dried cassava and soy-flour mixture. The purposes of this study were to compare soluble protein's content and to identify amino acids in fortified dried-cassava flour. The methods involved were making fortified dried-cassava flour with ratio of 25 g (soy-flour) and 5 g (yeasts) of 100 grams dried-cassava and fermentation of the mixture for 40 h, measuring soluble protein's content by biuret assay and identifying amino acids using Thin Layer Chromatography (TLC) and High Performance Liquid Chromatography (HPLC). Research design used Randomized Completely Block Design (RCBD). Treatments applied were unfortified dried cassava flour at 0 hour (G0); 20 hour (G20); 40 hour (G40) and fortified dried cassava flour at 0 hour (GF0); 20 hour (GF20) and 40 hour (GF40). As group was analyisis time. Data of soluble protein content were analyzed using ANNOVA. The Honestly Significant Differences (HSD) test at 5% level of significance was used to compare the treatments mean. The results showed that the soluble protein's content of 40 hours fermentation was higher than of 20 hours fermentation and the latter was higher than 0 hour fermentation, with values of 22.86%, 20.96%, and 18.70%, respectively. Based on TLC and HPLC identification, the amino acids in fortified dried-cassava flour, were aspartate, glumatate, serine, histidine, glicine, arginine, alanine, tyrosine, methionine, valine, isoleusine, leusine, and lysine.ABSTRAKPeningkatan kadar protein dan pengayaan asam amino dalam tepung gaplek dapat dilakukan dengan cara fortifikasi tepung gaplek dengan tepung kedelai melalui fermentasi. Tujuan dari penelitian ini adalah membandingkan kandungan protein  terlarut  antara  tepung  gaplek  tidak  terfortifikasi dan  terfortifikasi tepung  kedelai  pada  beberapa  waktu fermentasi dan mengidentifikasi asam amino yang terkandung dalam tepung gaplek dan tepung gaplek terfortifikasi. Metode penelitian meliputi pembuatan tepung gaplek terfortifikasi secara fermentasi dengan rasio penambahan tepung kedelai 25 g dan kapang 5 g dari 100 g gaplek yang kemudian difermentasi selama 40 jam. Kadar protein ditentukan menggunakan metode Biuret sedangkan identifikasi asam amino menggunakan metode Kromatografi Lapis Tipis (KLT) dan Kromatografi Cair Kinerja Tinggi (KCKT). Rancangan percobaan penelitian menggunakan Rancangan Acak Kelompok (RAK). Sebagai perlakuan adalah gaplek kontrol (tidak terfortifikasi tepung kedelai) pada jam ke-0 (G0); 20 jam (G20); 40 jam (G40) dan gaplek terfortifikasi pada jam ke-0 (GF0); 20 jam (GF20); dan 40 jam (GF40). Sebagai kelompok adalah waktu analisis. Data rata-rata kadar protein terlarut dibandingkan dengan uji Beda Nyata Jujur (BNJ) dengan tingkat kebermaknaan 5%. Hasil penelitian ini menunjukkan bahwa kadar protein terlarut pada fermentasi selama 40 jam lebih tinggi dibandingkan 20 jam dan 0 jam, dengan nilai 22,68%, 20,96%, dan 18,70% secara berurutan. Berdasarkan hasil identifikasi KLT dan KCKT, asam amino dalam tepung gaplek terfortifikasi adalah aspartat, glutamat, serin, histidin, glisin, arginin, alanin, tirosin, metionin, valin, isoleusin, dan lisin.
Analisis Distribusi Suhu dan Kelembaban Udara dalam Rumah Jamur (Kumbung) Menggunakan Computational Fluid Dynamics (CFD) Anisum Anisum; Nursigit Bintoro; Sunarto Goenadi
agriTECH Vol 36, No 1 (2016)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1132.86 KB) | DOI: 10.22146/agritech.10686

Abstract

One effort to optimize the temperature and humidity in the mushroom house during the dry season using evaporative cooler. This research was conducted two treatment variation which were assessed about distribution of temperature and humidity of air inside a mushroom house using Computational Fluid Dynamics (CFD) is the condition of building using natural ventilation and condition of building with water used evaporative cooler. Computational Fluid Dynamics (CFD) analysis was able to model the distributions of temperature and humidity, and air movement pattern inside of a mushroom house. The validation point of temperature distribution and humidity in the mushroom house has an error 0.70-2.62%. The results CFD analysis of temperature and humidity were able to reduced by about ±loC and ±5.1% for building with evaporative cooler used water. The indicated that buildings evaporative cooler used water able to reduced air temperature and increasing humidity in the mushroom houses.ABSTRAKSalah satu upaya untuk mengoptimalkan suhu dan kelembaban udara dalam rumah jamur pada musim kemarau dengan menggunakan evaporative cooler (pendingin penguap). Pada penelitian ini ada dua variasi perlakuan yang dikaji pendistribusian suhu dan kelembaban udara dalam rumah jamur dengan menggunakan Computational Fluid Dynamics (CFD), yaitu kondisi bangunan menggunakan ventilasi alamiah dan kondisi bangunan dengan pendingin penguap (evaporative cooler) menggunakan air. Analisis dengan Computational Fluid Dynamics (CFD) mampu memodelkan distribusi suhu dan kelembaban udara, serta pola pergerakan udara dalam rumah jamur. Nilai validasi distribusi suhu dan kelembaban udara dalam rumah jamur menunjukkan error 0,70 - 2,62%. Dari hasil analisis CFD suhu dan kelembaban udara mampu diturunkan sebesar ±1oC dan ±5,1% untuk bangunan dengan evaporative cooler menggunakan air. Hal ini menunjukkan bahwa bangunan dengan evaporative cooler menggunakan air mampu menurunkan suhu udara dan meningkatkan kelembaban udara dalam rumah jamur.
Aplikasi Thermal Pre-Treatment Limbah Tanaman Jagung (Zea mays) sebagai Co·Substrat pada Proses Anaerobik Digesti untuk Produksi Biogas Darwin Darwin; Yusmanizar Yusmanizar; Muhammad Ilham; Afrizal Fazil; Satria Purwanto; Sarbaini Sarbaini; Fatwa Dhiauddin
agriTECH Vol 36, No 1 (2016)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (470.159 KB) | DOI: 10.22146/agritech.10687

Abstract

Thermal pre-treatment was given on corn stover in the purpose of breaking the lignin content; thus, it may help anaerobic microorganisms to convert polymer including cellulose and hemicelluloses into biogas. This study aimed to investigate the effects of thermal pre-treatment on corn stover in anaerobic digestion process related to the production of biogas as well as digestion process efficiency. This research was carried out by utilizing batch reactors where the temperature was maintained at mesophilic conditions above room temperature (33 ± 2 oC). Based on the result, it was known that thermal pre-treatment given on the corn stover may enhance anaerobic digestion process for biogas production at the first 10 days. This condition reduced the time of lag phase during anaerobic digestion. The biogas production of corn stover given thermal pre-treatment was slow at 26 days where their average total production were 12,412.5 mL,12,310 mL at 15 and 25 minutes thermal pre-treatment, respectively while biogas production of non pre-treated corn stover was 12,557 mL. The highest daily biogas production was accomplished by corn stover that was given thermal pre-treatment at 25 minutes (915 mL). Corn stover given with 15 minutes thermal pre-treatment also generated higher daily biogas production at day 9 (772.5 mL) compared with corn stover that was not pre-treated (405 mL). This research also revealed that corn stover given thermal pre-treatment reached higher biogas yield compared with non pre-treated corn stover where their biogas yield were 670.39, 690.65 mL/g volatile solids added at 15 and 25 minutes thermal pre- treatment respectively, and 456.37 mL/g volatile solids added of non pre-treated corn stover.ABSTRAKThermal pre-treatment diberikan pada limbah tanaman jagung dengan tujuan untuk memecahkan kandungan lignin yang terdapat pada limbah tanaman jagung sehingga memudahkan mikroorganisme anaerobik untuk mengkonversi polimer yang berupa selulosa dan hemiselulosa menjadi biogas. Tujuan dari penelitian ini adalah untuk melakukan kajian mengenai penerapan thermal pre-treatment pada limbah tanaman jagung terhadap proses anaerobik digesi yang meliputi efisiensi proses digesi dan produksi biogas yang dihasilkan. Penelitian ini dilakukan dengan menggunakan reaktor tipe batch yang suhunya dipertahankan pada kondisi mesophilic atau di atas rata-rata suhu kamar (33 ± 2 oC). Hasil penelitian diperoleh bahwa thermal pre-treatment yang diberikan pada limbah tanaman jagung mampu mempercepat proses produksi biogas pada 10 hari pertama sehingga dapat mengurangi lag-phase pada proses anaerobik digesi. Limbah tanaman jagung yang diberikan thermal pre-treatment mengalami perlambatan produksi biogas pada hari ke 26 dengan rata-rata total produksi 12.412,5 mL untuk limbah tanaman jagung yang diberikan thermal pre- treatment selama 15 menit, dan 12.310 mL untuk limbah tanaman jagung yang diberikan thermal pre-treatment selama 25 menit, sedangkan limbah tanaman jagung yang tidak diberikan pre-treatment menghasilkan produksi biogas sebesar 12.557 mL pada hari ke 26. Produksi biogas harian tertinggi terjadi pada substrat yang diberikan thermal pre-treatment 25 menit, dengan produksi biogas tertinggi pada hari ke 9 dengan rata-rata produksi sebesar 915 mL. Substrat yang diberikan thermal pre-treatment 15 menit juga memproduksi biogas jauh lebih tinggi (772,5 mL) pada hari ke 9 jika dibandingkan dengan substrat tanpa diberikan pre-treatment yang hanya memproduksi biogas sebesar 405 mL. Data hasil penelitian menunjukkan bahwa limbah tanaman jagung yang diberikan thermal pre-treatment memperoleh biogas yield lebih tinggi dari pada yang tidak diberikan pre-treatment dimana 670,39 mL/g volatile solids untuk thermal pre- treatment 15 menit, 690,65 mL/g volatile solids untuk thermal pre-treatment 25 menit dan 456,37 mL/g volatile solids untuk limbah tanaman jagung yang tidak diberikan pre-treatment.

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