Hasil (
Bahasa Indonesia) 1:
[Salinan]Disalin!
that enzyme susceptibility is influenced by several factors, including the ratio of amylose/amylopectin, the crystalline structure andthe size of the particles. Amongst these factors, the crystallinegranular structure is the most important.The high-, medium- and low-amylose rice starches treated bythe HMT 25% had a higher concentration of reducing sugars at alltimes during the hydrolysis, as compared to HMT 15% and HMT20% and their respective native starches. These results are similarto those ofKweon, Haynes, Slade, and Levine (2000), who observeda trend toward increased digestibility of the starches with an increase in the moisture content of the HMT.Lorenz and Kulp (1982)reported that the changes in the HMTprobably occur in the amorphous regions of the granules that aremore accessible to the hydrolysis. According toGunaratne andHoover (2002), the HMT promotes a crystalline disruption and dissociation of double helical structures in the amorphous region.These authors studied the hydrothermal treatment (30% moisture/100C/10 h) of taro, cassava and potato starches, and concluded that there was an increase in the enzyme susceptibility ofheat-moisture treated starch. The possible disruption of the crystals near the surface of the granule can facilitate the attack of thea-amylase within the granule.The HMT 25% starches had a higher enzymatic susceptibility inthe first two hours of digestion as compared to the native starches.As reported by some authors (Jacobs, Eerlingen, Spaepen, Grobet, &Delcour, 1998), the amorphous areas of the starch granules aremore rapidly degraded by bacterial and pancreatica-amylase thanthe crystalline areas. The rearrangement caused by the hydrothermal treatment facilitated the accessibility of the amorphous areasby the enzyme. This may explain the fact that HMT 25% starchesshow a high concentration of reducing sugars in the first two hoursof hydrolysis as compared to the native starches
Sedang diterjemahkan, harap tunggu..
