Cassava pulp, the side product of tapioca industry consists of starch and fiber as the major component. Acid treatment was employed in the conversion process of cassava pulp into dietary fiber to remove the starch component, to increase fiber content, and to modify the structure of fiber. This study purposed to obtain optimum process conditions (acid concentration, temperature, and reaction time) in the production of dietary fiber from cassava pulp. Process optimization was conducted using Response Surface Methodology (RSM) for maximizing Total Dietary Fiber (TDF), Water Holding Capacity (WHC) and Oil Holding Capacity (OHC) as the responses. The optimum process was gained at 6% H2SO4 concentration, 127°C, and 45 mins. Prediction values of TDF, WHC, and OHC were 100%, 10.47 g/g, and 3.60 g/g, respectively. Validation was carried out and resulted in TDF 96.95%, WHC 10.47 g/g, and OHC 3.55 g/g. Physicochemical properties of the resulting dietary fiber were significantly improved. The fiber structure has modified which characterized by the changes in morphology and crystallinity.
Ketersediaan onggok yang melimpah di Indonesia serta tingginya kandungan pati dan serat merupakan potensi onggok yang belum dimanfaatkan secara optimal. Proses konversi onggok menjadi dietary fiber dan sirup gula dapat meningkatkan nilai tambah secara signifikan. Tujuan dari penelitian ini adalah mengetahui karakteristik produk dietary fiber dan sirup gula yang dihasilkan dari proses konversi onggok, serta mengetahui pengaruh ukuran partikel dietary fiber terhadap karakteristik sifat fisikokimianya. Konversi onggok dilakukan dengan perlakuan asam dan panas. Dietary fiber yang dihasilkan mempunyai komposisi kimia yang terdiri dari total dietary fiber 96-97%, kadar pati 2,7%, kadar abu 1,3% serta nilai water holding capacity 10,68-11,52 g/g dan oil holding capacity 3,44-3,72 g/g. Semakin kecil ukuran partikel dietary fiber, semakin besar nilai water holding capacity dan oil holding capacity. Sirup gula yang dihasilkan mempunyai reducing sugar 5,6%,total sugar 18,7%, dextrose equivalent 30 dan derajat polimerisasi 3,32. Jenis gula yang dihasilkan terdiri dari dekstrin 7,2%, maltosa 2,43%, glukosa 5,24%, dan arabinosa 0,79%. Dietary fiber yang dihasilkan dapat diaplikasikan sebagai pangan fungsional aditif dalam industri pangan (roti, sosis, dan pengganti lemak), sedangkan sirup gula dapat diaplikasikan untuk industri confectionary
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