Field test for apparent amylose type for milled rice quality classification
2009
Tuaño, A.P.P. | Roferos, L.T. | Juliano, JB.O., Philippine Rice Research Inst., Los Baños, College, Laguna (Philippines)
A field test for apparent amylose content (AC) type is a promising tool for use by rice quality inspector, institutions and restaurants that purchase milled rice in bulk to classify rice quality into three clusters based on AC and gelatinization temperature (GT) combination. The field test for AC type based on the iodine staining method of Kongseree et al. (2002) was adapted to Philippine rice to identify low-AC, intermediate-AC and high-AC milled rice. Milled rice was surface-defatted with 70% 2-propanol or ethanol and stained with 0.01% iodine in 0.1% potassium iodide in distilled water. The degree of stain was reduced by oxidants in tap water and 70% alcohol, pH of tap water, degree of milling and freshly milled rice. A comparison GT test based on the alkali test of Little et al. (1958) was also tested on row milled rice to distinguished low GT from intermediate-high GT within 15-20 min. Since the rapid method was inferior to the standard 23 hr soak in 1.7% KOH, the latter method is recommended.
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