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Carbohydrate content and composition of product from subcritical water treatment of coconut meal
Pramote Khuwijitjaru,Kumutakan Watsanit,Shuji Adachi 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.1
Coconut meal, a by-product from coconut milk production, was treated with subcritical water at 100–200 8C for 30–240 min in a batch-type reactor. The analysis focused on the content and constituent neutral sugar of the soluble carbohydrate in the liquid products. The carbohydrate is composed of both monosaccharides and oligosaccharides. Treatments at 100–150 8C gave a small amount of a carbohydrate (3.5–5.1 g/100 g dry coconut meal). At 175 8C, the carbohydrate content increased from 4.9 to 9.6 g/100 g dry coconut meal (p < 0.05) for 30–240 min of treatment, but the value decreased from 10.6 to 6.1 g/100 g dry coconut meal for 30–240 min of treatment at 200 8C. The soluble carbohydrate contained mannose, glucose, galactose and arabinose. A response surface methodology study indicated that 13.9 g/100 g dry coconut meal of mannose in the soluble carbohydrate could be produced at 227 8C in 3 min.