|ชื่อเรื่อง:||Busakorn Sajaroen, Piyachat Chai-uer and Doungjai Thirathumthavorn. 2015. Effect of alpha-amylase hydrolysis on reducing sugar and viscosity of two brown rice flours. Journal of Food Science and Agricultural Technology 1(1): 79-82. Full Text
|Busakorn Sajaroen, Piyachat Chai-uer and Doungjai Thirathumthavorn. 2015. Effect of alpha-amylase hydrolysis on reducing sugar and viscosity of two brown rice flours. Journal of Food Science and Agricultural Technology 1(1): 79-82.
|บทคัดย่อ:||Brown rice flour is very attractive as an ingredient for functional food. The high viscosity
of starch component can be reduced by enzymatic hydrolysis. However, there is limited
information about enzyme treatment on brown rice flour. The objective was to investigate
the effect of alpha-amylase hydrolysis on two varieties of brown rice flours (Sinlek rice and
Jasmine rice). Both of them contain the same level of amylose content. In addition, Sinlek
rice (a crossbred of Jasmine rice and Hom Nil rice) is nutritious and presents high amount
of iron. Brown rice flour was prepared by milling with pin mill and then sieving (14 mesh
sieve). Proximate composition and pasting profile measured by Rapid Visco Analyzer were
determined to characterize the material. Alpha-amylase (Termamyl SC, 1.80 U/g and 4.40
U/g) was introduced in 20% (w/v) brown rice flour at a temperature of 90±2 oC and hold for
90 min. Reducing sugar and Brookfield viscosity of the hydrolyzed products were measured.
The results showed that the unhydrolyzed Jasmine brown rice flour presented higher peak,
breakdown and final viscosity than another sample. On the contrary, the hydrolyzed brown
Jasmine rice exhibited less viscous when comparing at the same level of α-amylase. The
viscosity of the hydrolyzed product was found to have a statistically significant difference
between a couple of rice varieties as well as two levels of enzyme activity. In term of reducing
sugar, it was only found a significant difference in enzyme level. The present study could
provide guidance for food applications i.e. beverage and instant mixes.
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