Applied Agriculture - Research Publications

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Subject: search.filters.subject.Gelatinization

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    Structural and functional properties of amaranth starches from residue obtained during protein extraction
    (Springer, 2021-07-26T00:00:00) Shevkani, Khetan; Singh, Narpinder; Isono, Naoto; Noda, Takahiro
    The present study evaluated Amaranthus caudatus (AC) and A. hypochondriacus (AH) starches obtained as coproduct during protein extraction for composition, granule size, amylopectin fine structure, thermal, retrogradation, pasting and dynamic rheological-properties to elucidate structure-function relationships. The starches exhibited unimodal particle size distribution with mean granule size of 1.26�3.12�?m. AC starch with larger granules (mean granule size 3.12�?m) than AH starches (1.26�1.59�?m) gelatinized at lower temperatures (lower DSC transition and pasting temperatures), showed higher paste viscosities and produced more elastic gels (lower tan ? and higher G?). Starch granule size related positively with the proportion of amylopectin chains with DP < 12, paste viscosities and dynamic rheological moduli while negatively with non-starch components, gel tan ? and the proportion of amylopectin chains with DP > 12. Starches with greater proportion of amylopectin chains with DP > 12 showed higher gelatinization temperatures, while shorter chains (DP < 12), lipids and proteins contributed to reduced retrogradation tendencies (lower percent retrogradation). � 2021, The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.
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    Structural and functional properties of amaranth starches from residue obtained during protein extraction
    (Springer, 2021-07-26T00:00:00) Shevkani, Khetan; Singh, Narpinder; Isono, Naoto; Noda, Takahiro
    The present study evaluated Amaranthus caudatus (AC) and A. hypochondriacus (AH) starches obtained as coproduct during protein extraction for composition, granule size, amylopectin fine structure, thermal, retrogradation, pasting and dynamic rheological-properties to elucidate structure-function relationships. The starches exhibited unimodal particle size distribution with mean granule size of 1.26�3.12�?m. AC starch with larger granules (mean granule size 3.12�?m) than AH starches (1.26�1.59�?m) gelatinized at lower temperatures (lower DSC transition and pasting temperatures), showed higher paste viscosities and produced more elastic gels (lower tan ? and higher G?). Starch granule size related positively with the proportion of amylopectin chains with DP < 12, paste viscosities and dynamic rheological moduli while negatively with non-starch components, gel tan ? and the proportion of amylopectin chains with DP > 12. Starches with greater proportion of amylopectin chains with DP > 12 showed higher gelatinization temperatures, while shorter chains (DP < 12), lipids and proteins contributed to reduced retrogradation tendencies (lower percent retrogradation). � 2021, The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.
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    Wheat starch production, structure, functionality and applications :a review
    (Blackwell Publishing Ltd, 2017) Shevkani, Khetan; Singh, 2 Narpinder; Bajaj, Ritika; Kaur, Amritpal
    Starch is the main component of wheat having a number of food and industrial applications. Thousands of cultivars/varieties of different wheat types and species differing in starch functionality (thermal, retrogradation, pasting and nutritional properties) are grown throughout the world. These properties are related to starch composition, morphology and structure, which vary with genetics, agronomic and environmental conditions. Starches from soft wheat contain high amounts of surface lipids and proteins and exhibit lower paste viscosity, whereas that from hard cultivars contain high proportion of small granules and amylose content but lower gelatinization temperature and enthalpy. Waxy starches exhibit higher-percentage crystallinity, gelatinization temperatures, swelling power, paste viscosities and digestibility, but lower-setback viscosity, rate of retrogradation and levels of starch lipids and proteins than normal and high-amylose starches. Starches with high levels of lipids are less susceptible towards gelatinization, swelling and retrogradation and are good source of resistant starch, while that with high proportion of long amylopectin chains are more crystalline, gelatinize at high temperatures, increase paste viscosity, retrograde to a greater extent and decrease starch digestibility (high resistant and slowly digestible starch and low rapidly digestible starch). ? 2016 Institute of Food Science and Technology