Field test for apparent amylose type for milled rice quality classification

Issue Date

6-2009

Abstract

A field test for apparent amylose content (AC) type is a promising tool for use by rice quality inspectors, 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 companion GT test based on the alkali test of Little et al. (1958) was also tested on raw milled rice to distinguish low GT from intermediate-high GT within 15-20 min. Since the rapid method was inferior to the standard 23-h soak in 1.7% KOH, the latter method is recommended.

Source or Periodical Title

Philippine Agricultural Scientist

ISSN

317454

Volume

92

Issue

2

Page

228-232

Document Type

Article

College

College of Arts and Sciences (CAS)

Language

English

Subject

Alkali spreading value, Amylose content, Field test, Gelatinization temperature, Iodine stain, Rice cluster type

Digital Copy

None

This document is currently not available here.

Share

COinS