Compositions and methods for producing starch with novel functionality
AssigneeCorn Products Development, Inc.
InventorsHongxin Jiang, Brad Ostrander, Chris Lane
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Abstract
This invention disclosure relates to novel maize starch. The starch can be made from the newly developed waxy sugary-2 double-mutant maize that has low activity of Granule Bound Starch Synthase I (GBSSI), which results in low amylose level. The starch from newly developed waxy sugary-2 double-mutant is freeze-thaw stable and has high viscosity. In comparison with the starch of the existing waxy sugary-2 double-mutant maize, the new waxy sugary-2 double-mutant maize starch showed, inter alia, improved pasting profile, starch granule integrity, larger starch granule size, and higher viscosity.
Claims15
A starch comprising:
- an amylose content of from about 2 wt % to about 20 wt % as measured using an amylose/amylopectin assay kit;
- and
- an aqueous starch pasting temperature that is at least about 5% greater than the starch pasting temperature of a control starch as measured using RVA analysis,
- wherein, the starch is derived from a waxy-sugary 2 corn plant comprising at least one wxS allele in the endosperm.
A method for improving at least one characteristics in a pasting profile of a starch comprising introducing at least one wxS allele into the endosperm of a waxy corn plant, wherein the resultant starch derived from the waxy corn plant comprising at least one wxS allele in the endosperm comprises an aqueous starch pasting temperature which is at least about 5% greater than a starch pasting temperature of a control starch as measured using RVA analysis, thereby improving at least one characteristic of the pasting profile of the starch compared a control starch.
A double-mutant corn plant, wherein the corn plant is homozygous recessive for the starch synthase IIa (su2) gene, and either homozygous or heterozygous for a mutated Granule-bound starch synthase I (GBSSI) gene, wherein the mutated GBSSI gene has less GBSSI activity than the wild type GBSSI gene (Wx), but has higher GBSSI activity than the recessive, loss-of-function GBSSI gene (wx).
Dependencies are inferred from the claim text.