Open Access. Powered by Scholars. Published by Universities.®

Life Sciences Commons

Open Access. Powered by Scholars. Published by Universities.®

PDF

Food Science

Food Science and Human Nutrition Publications

1994

Articles 1 - 2 of 2

Full-Text Articles in Life Sciences

Dosage Effect At The Sugary-2 Locus On Maize Starch Structure And Function., M. R. Campbell, Pamela J. White Jan 1994

Dosage Effect At The Sugary-2 Locus On Maize Starch Structure And Function., M. R. Campbell, Pamela J. White

Food Science and Human Nutrition Publications

Structural characteristics and functional properties of starches isolated from kernels of a sugary-2 (su2) dosage series were examined to determine whether the normal allele (Su2) was completely dominant to the recessive allele (su2). Differential scanning calorimetry revealed intermediate values for gelatinization onset, gelatinization peak, range, total enthalpy, and retrogradation among genotypes possessing one and two mutant su2 alleles. No effect of gene dosage on amylose content was observed, but X-ray diffraction patterns revealed an intermediate degree of crystallinity relative to normal and mutant genotypes upon addition of two su2 alleles. Development of a peak at 19 degrees 2(theta) became ...


Effect Of Planting Date On Maize Starch Thermal Properties., M. R. Campbell, Linda M. Pollak, Pamela J. White Jan 1994

Effect Of Planting Date On Maize Starch Thermal Properties., M. R. Campbell, Linda M. Pollak, Pamela J. White

Food Science and Human Nutrition Publications

Starches isolated from kernels of two maize (Zea mays L.) inbreds and their F1 progeny, grown after four planting dates, were evaluated for differences in thermal properties. Differential scanning calorimetry (DSC) was used to compare onset (To) and peak (Tp) temperature, range (Rn), and total enthalpy ((Delta)H) values of gelatinization. Amylose content (%AM) of samples was determined colorimetrically, and image analysis was used to determine average diameters of granules. Significant (P less than or equal to 0.05) increases for Tp and (Delta)H were observed with later planting dates. Significant genotypic differences also were seen for To, Tp ...