S. Joni Munarso
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Perubahan Sifat Fisikokimia dan Fungsional Tepung Beras Akibat Proses Modiflkasi Ikat-Silang S. Joni Munarso; D. Muchtadi; D. Fardiaz; R. Syarief
Jurnal Penelitian Pascapanen Pertanian Vol 1, No 1 (2004): Jurnal Penelitian Pascapanen Pertanian
Publisher : Balai Besar Penelitian dan Pengembangan Pascapanen Pertanian

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21082/jpasca.v1n1.2004.22-28

Abstract

Penelitian ini dilakukan untuk mengevaluasi perubahan sifat fisik, kimia dan fungsional tepung beras akibat proses modifikasi ikat-silang. Sebanyak 4 jenis beras, yaitu IR64B, IR64J, IR42B, dan IR42J yang beragam dalam hal mutu dan kadar amilosanya direaksikan dengan fosfor-oksiklorida (POCI,) dengan konsentrasi yang bervariasi, yi. 0, I; 0,2 dan 0,3% pada pH 10,5. Hasil penelitian menunjukkan bahwa tepung beras terfosforilasi atau terikat-silang terbukti mengalami perubahan, yakni kenaikan derajad putih, dan berbagai perubahan sifat kimia maupun fungsional lain. Kadar pati tepung beras makin menurun akibat penggunaan POCI3 dengan konsentrasi yang makin tinggi. Akibat penurunan kadar pati ini, kadar komponen kimia lain, seperti protein, lemak, serat, abu dan fosfor mengalami peningkatan. Pada tepung beras terikat-silang juga diperoleh sifat pasta yang meningkat baik pada viskositas puncak, viskositas pasta, maupun viskositas balik. Changes of physicochemical and functional properties of rice flour as affected by cross link modification processAn experiment to evaluate the changes of physical, chemical and functional properties of rice flour as affected by cross-linked modification process has been executed. Four rice samples, namely IR64B. IR64J, IR42B. and lR42J, which differrent quality and amylose content, were reacted with phosphor-oxychloride (POCl,) at various concentrations, i.e. 0.1 ; 0.2 and 0.3%, at the pH of 10.5. The result shows that phosphorilated or cross-linked rice flour had been identified to have higher whiteness degree. and some' changes in chemical and functional properties. Starch content of rice decreased as higher concentration of POCl, is applied. Meanwhile, the content of other chemical compounds, such as protein, fat, fiber, ash and phosphorous, increased as starch content decreased. Higher peak, paste, and set back viscosities were also observed in cross-linked rice flour.
PENGARUH PENAMBAHAN STARTER MIKROBA SERTA PEMERASAN PULP TERHADAP KONDISI FERMENTASI DAN MUTU BIJI KAKAO (Theobroma cacao L.) S. Joni Munarso; Kun Tanti Dewandari; Zahra Haifa
Jurnal Penelitian Pascapanen Pertanian Vol 13, No 3 (2016): Jurnal Penelitian Pascapanen Pertanian
Publisher : Balai Besar Penelitian dan Pengembangan Pascapanen Pertanian

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21082/jpasca.v13n3.2016.156-166

Abstract

Telah dilakukan penelitian yang bertujuan untuk mengetahui pengaruh penambahan starter mikroba (Acetobacter aceti, Lactobacillus plantarum dan Saccharomyces cereviceae) serta pemerasan pulp terhadap fermentasi dan mutu biji kakao. Penelitian menggunakan metode Rancangan Acak Lengkap (RAL) pola faktorial 3x5 dengan dua kali ulangan. Faktor pertama adalah fermentasi yaitu fermentasi biji kakao secara spontan (F1), Fermentasi biji kakao dengan penambahan A. aceti, L. plantarum dan S. cereviciae (F2), Fermentasi biji kakao dengan perlakuan pemerasan pulp serta penambahan A. aceti, L. plantarum dan S. cereviciae (F3). Sedangkan faktor kedua adalah lama fermentasi (H1, H2, H3, H4 dan H5). Hasil penelitian menunjukkan bahwa penambahan starter meningkatkan konsentrasi etanol pada saat fermentasi dan meningkatkan kadar asam asetat, tetapi menurunkan konsentrasi asam oksalat pada biji kakao. Penambahan starter disertai pemerasan pulp menghasilkan biji kakao dengan kadar asam asetat sebesar 0,47%, sedangkan biji kakao tanpa pemerasan kadar asam asetat 0,49%. Penambahan starter disertai pemerasan pulp menghasilkan mutu biji kakao terbaik dengan karakteristik sebagai berikut: skor nilai uji belah tertinggi (379 dari 400), mutu fisik (Golongan mutu A) serta memenuhi persyaratan mutu SNI 2008 No. 2323 tentang biji kakao dengan rasio jumlah per berat biji sebanyak 88 biji/100g; nilai pH 4,93; kadar asam asetat 0,47%, kadar lemak 34,90%, kadar air 4,47%, kadar serat kasar 3,66% dan kadar abu 4,82% dengan waktu fermentasi selama 5 hari.English Version AbstractEffect of Starter Culture Addition and Depulping on The Fermentation and Quality of Cocoa Beans (Theobroma cacao L.)S Joni Munarso, Kun Tanti Dewandari, and Zahra Haifa. 2016. Effect of Starter Culture Addition and Depulping on The Fermentation and Quality of Cocoa Beans (Theobroma cacao L.). The aimed of this study was to investigate the effect of starter culture addition (Acetobacter aceti, Lactobacillus plantarum, and Saccharomyces cerevisiae) with depulping on the fermentation and quality of cocoa beans. The experimental design of this study was conducted using a 3×5 factorial Completely Randomized Design (CRD) with duplicate replication. The first factor was fermentation condition included spontaneously fermented cocoa beans (F1), fermentation of cocoa beans with the addition of A. aceti, L. plantarum and S. cereviciae (F2), Fermented cocoa beans with depulping and addition of A. aceti, L. plantarum and S. Cereviciae (F3). The second factor was time of fermentation. The result revealed that starter addition increased ethanol concentration on the fermentation process, increased acetate acid, and citric acid concentratio, meanwhile oxalic acid decreased on cocoa beans during 5 days of fermentation. Depulping caused a slight decrease in acetic acid concentration at the end of fermentation with value of 0,47%, meanwhile the sample of cocoa beans without depulping treatment had acetic acid concentration of 0,49%. Starter culture addition and depulping treatment resulted the best characteristic of cocoa beans which visualized by the largest amounts of cut test score (379 of 400), physical quality (Grade A) and completed SNI No. 2323-2008 requirements with total beans/100 g ratio of 88 beans/100g; pH values of 4,93; acetic acid concentrations of 0,47%, content of fat 15,12%, moisture 4,47%, crudefiber 3,66% and total ash 4,82% after 5 days fermentation.
Effect of Surfactant Addition on The Physico-Chemical Properties and Stability of Virgin Coconut Oil Nanoemulsions Linda Trivana; Nugraha E. Suyatma; Dase Hunaefi; S. Joni Munarso
Buletin Palma Vol 22, No 1 (2021): Juni 2021
Publisher : Pusat Penelitian dan Pengembangan Perkebunan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21082/bp.v22n1.2021.31-42

Abstract

Virgin coconut oil (VCO) is high quality coconut oil and categorized as the healthiest oil and functional foods. Based on these benefits, the development of a VCO in emulsion product might increase the human consumption of coconut oil because consumers dislike the only taste of pure VCO. The aim of this study was to develop the water compatible form of VCO through nano-emulsification. The effect of different types and amounts of surfactants (Tween 80 and Span 80) on the physio-chemical characteristic of emulsion containing VCO was investigated. VCO based emulsions were prepared with the aid of Ultra-Turrax homogenizer. Emulsions were developed by adding and mixing VCO with surfactants. The ratio of Tween 80 and Span 80 used were 0:10, 2.5:7.5, 5:5, 7.5:2.5, and 10:0. The droplet size of nanoemulsions consisting of Tween 80:Span 80 (0:10, 2.5:7.5, 5:5, 7.5:2.5, and 10:0) were 1.343, 0.606, 0.829, 1.439, and 2.506µm, respectively. Based on the TEM analysis and polydispersity index (PDI) >0.5 showed the oil droplets are in not uniform shape, indicating a unstable emulsion. VCO emulsion with ratio Tween 80:Span 80 (0:10) obtained a homogeneous emulsion (stable) compare than that of others and w/o type emulsion. The stability of emulsion is evaluated by turbidity measurement using UV-VIS spectrophotometer with wavelength 502 nm. A combination of  treatments (ambient condition, thermal treatmeant (40°C)), and centrifuge) of VCO emulsion has resulted on thermal treat, the turbidity measured from the emulsion was higher than the other emulsion, reflecting the presence of the smaller droplets in this emulsion.