Successive Reduction Dry Milling of Normal and Waxy Corn: Grain, Grit, and Flour Properties.
Dry milling of different corn types resulted in varied proportions of germ, pericarp, grit and flour. Grit and flour produced during different reduction stages varied in particle size and chemical constituents, hence applications in food industry. In this study, recovery of different fractions and variation in physicochemical and pasting properties of grit and flour fractions obtained during 3 successive reduction dry millings of 2 normal (African tall, HQPM1) and 1 waxy corn (IC 550353) were evaluated. Waxy corn grains had the highest L*, a*, b*, ash, fat, and protein content and the lowest weight. Waxy and African tall gave the highest recovery of germ and pericarp, respectively. Waxy corn showed lower grit and flour recovery as compared to normal corn. Flour fractions showed higher L* and lower a* and b* values than grit fractions. Particle size of grit and flour fractions ranged from 840 to 982 μm and 330 to 409 μm, respectively. Fractions with larger particle size showed lower L* value. The b* value showed positive correlation with yellow pigment content. Grit and flour from the 1st reduction stage showed higher ash and fat content. Protein content was correlated positively with ash content and negatively with L* value. Grit and flour fractions with higher protein content had lower pasting viscosities. Pasting viscosities were higher for flours than their corresponding grits. Protein profiling of grit and flour fractions from different stages showed quantitative and qualitative differences in medium (22, 28, and 35 kDa) and low molecular weight (16, 17, and 19 kDa) polypeptides and were related to grit and flour yield.
Dept. of Food Science and Technology, Guru Nanak Dev Univ., Amritsar, Punjab, India.
Sheetal
S
Thakur
Dept. of Food Science and Technology, Guru Nanak Dev Univ., Amritsar, Punjab, India.
Amritpal
A
Kaur
Dept. of Food Science and Technology, Guru Nanak Dev Univ., Amritsar, Punjab, India.
Narpinder
N
Singh
Dept. of Food Science and Technology, Guru Nanak Dev Univ., Amritsar, Punjab, India.
Amardeep Singh
AS
Virdi
D003116:Color; D004032:Diet; D004041:Dietary Fats / Q000032:analysis; D004044:Dietary Proteins / Q000032:analysis; D002523:Edible Grain / Q000737:chemistry*; D005433:Flour / Q000032:analysis*; D005525:Food-Processing Industry; D006801:Humans; D010316:Particle Size; D010858:Pigmentation; D013045:Species Specificity; D014783:Viscosity; D014885:Waxes; D003313:Zea mays / Q000737:chemistry* / Q000145:classification
D004041:Dietary Fats; D004044:Dietary Proteins; D014885:Waxes
SDS-PAGE; dry milling; particle size; pasting; protein; waxy corn; yellow pigment content (YPC)