Effect of grain morphology on degree of milling and iron loss in rice

ABSTRACT Grain morphological characteristics were thought to play a significant role in genotypic variation in Fe concentration in white rice. Comparing 17 rice cultivars representing six major grain morphological categories, the present study systematically investigated the relationship between grain morphology, the degree of milling (DOM), and the loss of Fe during the polishing process. The relative importance of key morphological parameters in this relationship was also investigated. The grain morphological characteristics of different rice cultivars significantly affected the degree of Fe loss during polishing to produce white rice. This variation in Fe loss from polishing among the six categories of rice cultivars is mainly due to their difference in DOM (r = 0.73**) and this loss in Fe was the primary factor determining the level of Fe concentration in the white rice. Among the morphological parameters investigated, grain length and length-to-width ratios played the most significant role in determi...

[1]  T. Siebenmorgen,et al.  Milling Characteristics of Rice Cultivars and Hybrids , 2006 .

[2]  M. Vasconcelos,et al.  Enhanced iron and zinc accumulation in transgenic rice with the ferritin gene , 2003 .

[3]  S. Geng,et al.  Non‐Uniformity of Grain Characteristics and Milling Quality of California Rice (Oryza sativa L.) of Different Maturities , 2002 .

[4]  Ingo Potrykus,et al.  Fighting Iron Deficiency Anemia with Iron-Rich Rice , 2002, Journal of the American College of Nutrition.

[5]  G. Gregorio.  Progress in breeding for trace minerals in staple crops. , 2002, The Journal of nutrition.

[6]  J. Humphries,et al.  Nutritionally enhanced cereals: A sustainable foundation for a balanced diet. , 2000, Asia Pacific journal of clinical nutrition.

[7]  S. Toki,et al.  Iron fortification of rice seed by the soybean ferritin gene , 1999, Nature Biotechnology.

[8]  R. Graham,et al.  Breeding for micronutrient density in edible portions of staple food crops: conventional approaches , 1999 .

[9]  J. D. Reid,et al.  Factors affecting the slope of head rice yield vs. degree of milling , 1998 .

[10]  H. Bouis.  Enrichment of food staples through plant breeding: a new strategy for fighting micronutrient malnutrition. , 2009, SCN news.

[11]  T. Siebenmorgen,et al.  Milling characteristics of various rough rice kernel thickness fractions , 1993 .

[12]  R. Rao,et al.  Effect of Grain Type and Milled Rice Kernel Hardness on the Head Rice Yields , 1985 .

[13]  T. Srinivas,et al.  Varietal Difference in the Topography of Rice Grain and Its Influence on Milling Quality , 1984 .

[14]  B. O. Juliano,et al.  Nutrient content and distribution in milling fractions of rice grain. , 1979, Journal of the science of food and agriculture.

[15]  B. Belavady.,et al.  Effect of milling on mineral and trace element composition of raw and parboiled rice. , 1979, Journal of the science of food and agriculture.