Electronic Theses and Dissertation

Umbi janeng (dioscorea hispida dennst) merupakan sumber karbohidrat. penelitian ini bertujuan untuk menentukan komponen monosakarida, disakarida dan polisakarida pada umbi janeng. komposisi karbohidrat umbi janeng (gula pereduksi, gula total, pati, amilosa, amilopektin, serat kasar, dan serat pangan) dianalisis dengan metode luff schoorl, gravimetri dan spektrofotometri, sedangkan komposisi gula (glukosa, fruktosa, sukrosa, dan maltosa) dianalisis dengan instrumen hplc. morfologi, derajat kristalinitas umbi janeng dianalisis dengan instrumen sem dan xrd. hasil penelitian menunjukkan komposisi karbohidrat umbi janeng meliputi kadar gula pereduksi, gula total, pati, amilosa, amilopektin, serat kasar dan serat pangan berturut-turut adalah 0,345%, 0,472%, 40,48%, 3,28%, 37,2%, 2,12% dan 10,4% berat kering (bk). komposisi gula umbi janeng meliputi glukosa, fruktosa, sukrosa, dan maltosa berturut-turut adalah 0,15%, 0,20%, 4,81% dan

Janeng (Dioscorea hispida Dennst) tuber is a source of carbohydrate. This study aims to determine the components of monosaccharides, disaccharides, and polysaccharides in janeng tuber. The carbohydrate composition of janeng tuber (reducing sugar, total sugar, starch, amylose, amylopectin, crude fiber, and dietary fiber) was analyzed using Luff Schoorl, gravimetric, and spectrophotometric methods, while the sugar composition (glucose, fructose, sucrose, and maltose) was analyzed using HPLC. The morphology and crystallinity degree of janeng tuber were analyzed using SEM and XRD. The results of the study showed that the carbohydrate composition of janeng tuber, including reducing sugar content, total sugar, starch, amylose, amylopectin, crude fiber, and dietary fiber, were 0.345%, 0.472%, 40.48%, 3.28%, 37.2%, 2.12%, and 10.4% dry weight (dw) respectively. The sugar composition of janeng tuber, including glucose, fructose, sucrose, and maltose, were 0.15%, 0.20%, 4.81%, and