Kajian Mutu Produk Glukomanan Komersial di Indonesia

Utomo, Nayaka Putra Prasetya (2025) Kajian Mutu Produk Glukomanan Komersial di Indonesia. Undergraduate thesis, Politeknik Negeri Jember.

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Abstract

Porang (Amorphophallus muelleri Blume) tubers are one source of glucomannan. Glucomannan is a hydrocolloid with gelling properties that various industries. The purpose of this study was to determine the glucomannan content and characteristics of commercial glucomannan products from four regions in Indonesia. Semarang (GK1), Surabaya (GK2), Bandung (GK3), and Sleman-Yogyakarta (GK4). Glucomannan characterization physical properties, chemical composition, rheology, morphology, molecular and feasibility study. The results showed GK1 had the highest whiteness index (80.97%) and swelling capacity (31.08 g/mL). The highest solubility is GK2 (95.93%). GK1 has a chemical composition that meets quality standards, glucomannan (82.15%), moisture (10.72%), ash (1.56%), starch (0.80%), and protein (0.89%). The highest oxalate (Ca) in GK3 was (1.14 ppm). Meanwhile, the highest calcium (Ca) in GK4 was (4.19 ppm). Heavy metal (Pb) was not detected in GK1 and GK2, but in GK1 contained 0.016 ppm and GK3 0.019 ppm. The rheological profiles of all samples showed shear-thinning behavior with the highest viscosity in GK1 (18.466 cP). The morphology, GK4 showed the presence of calcium oxalate crystals. The molecular weight distribution of glucomannan sample GK2 had a Mw value of (5.9 × 105), the highest (Mn) value in GK1 of (4.43 × 105) and PDI (Mw/Mn) (4.43 × 105). The FTIR spectra of all samples were identical to the spectra of glucomannan. Feasibility study showed that GK1 is feasible to develop with positive NPV, B/C ratio >1, and payback period 0.178 years. Variations in characteristics between glucomannan samples may be influenced by the geographical conditions of the porang plant or the extraction method used.

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