Enzymic extraction of native starch from sago (Metroxylon sagu) wasteresidue

摘要

Residual native starch was extracted from sago pith residue using two types of commercial cell-wall degrading enzymes, Pectinex Ultra SP-L and Ultrazyme 100G. The first increased starch yield with a shorter incubation period than the second. The superior effect of Pectinex Ultra SP-L was observed already at 0.5 h, where a wide granule size distribution (8-87 mum) was obtained. A slight increase in the release of granules ranging from 30-60 mum was noted within a 2 h incubation period. However, upon further incubation, the distribution pattern was similar to that of untreated samples. Samples treated with Ultrazyme 100G exhibited a unimodal distribution pattern, with larger granules, ranging from 40-70 mum, being released upon further incubation within a 2 h incubation period. However, all samples exhibited a bimodal distribution upon further incubation.