Some properties of large and small granules of waxy barley (Hordeum vulgare L.) endosperm starch.

Abstract

SummaryLarge and small starch granules were isolated and character ized from mature barley kernels with waxy endosperms. The large granules of any given waxy cultivar contained more amylose than the small granules of the same cultivar.It was also found that large granules contained a greater amount of long amylopectin B chains and had a lower fraction III: fraction II ratio, one of the structural characteristics of amylopectin, than the small granules in the same cultivar. Small granules showed a wider range of gelatinization and smaller heat of gelatinization by differential scanning calorimetry.

Some Physiochemical Properties of Large, Medium and Small Granule Starches in Fractions of Wheat Grain.

“…Peng et al (1999) reported that large granules of wheat starch had higher enthalpies than small granules from six wheat cultivars. The same tendency was reported in barley starches (Kang et al, 1985;Naka et al, 1985;Vasanthan & Bhatty, 1996;Tang et al, 2000), which supports our result. The higher gelatinization temperature range of small granule starch may be due to the higher number of granules per weight of starch.…”

Starch Properties of the Sago Palm (Metroxylon sagu Rottb.) in Different Soils

“…Smaller sized granules were abundant in sago palms grown in mineral soil. The existence of two groups (or three groups) of sizes of starch granules has been studied on wheat and barley [30][31][32]. The physiological role of differentiation of group is still unclear, while Takeda et al [33] suggested that there exists genetical control for the synthesis of different size of granule.…”

Some Physicochemical Properties of Small‐, Medium‐, and Large‐Granule Starches in Fractions of Waxy Barley Grain

“…The enthalpies tended to decrease in the order of large, medium, and small granules in the same fractions. Kang et al (1985) and Naka et al (1985) indicated that large granules of barley starch had a higher enthalpy of gelatinization than small granules of the same cultivar. Vasanthan and Bhatty (1996) also reported that barley smallgranule starch had lower enthalpy than large-granule starch, which supports our results.…”

“…Barley starches have bimodal granules containing large (A-type) and small (B-type) size particles. The physicochemical properties and structural characteristics of the Aand B-type or total starch granules have been reported (Mac-Gregor et al 1971;MacGregor and Morgan 1984;Kang et al 1985;Naka et al 1985;Morrison et al 1986;Wu and Seib 1990;Morrison 1990, 1992;Inagaki and Seib 1992;Morrison et al 1993;Jenkins and Donald 1995;Schulman et al 1995;Vasanthan and Bhatty 1996;Bhatty and Rossnagel 1997;Czuchajowska et al 1998;Zheng et al 1998). However, the result obtained recently with a particle-size analyzer showed that the distribution curves of barley starch had two peaks and an intermediate curve between the peaks.…”