Abstract
The impact of hydrothermal treatment on functional, rheological, thermal and morphological properties of pearl millet starch was investigated. Starch was modified by heat-moisture treatment (HMT) at 110 °C for 4 h at varying moisture content, i.e. 20 % (HMT-20), 25 % (HMT-25) and 30 % (HMT-30). Resistant starch (RS) content increased significantly (p < 0.05) due to HMT with maximum (6.14 %) for HMT-30. Dextrose equivalent (DE) value also increased due to HMT and ranged between 3.97 and 7.35 %. Solubility of the starch decreased, whereas swelling power and oil absorption capacity increased due to HMT. The pasting temperature increased while peak, breakdown, setback and final viscosity decreased after HMT. The G′ (storage modulus) of starch paste (5 %) from treated samples was lower as compared to native (33.5 Pa). The gelatinization temperature (Tp) increased significantly (p < 0.05) due to HMT. Pearl millet starch granules were mainly round/oval, irregular and polygonal shape with 3–12 µm size. HMT at higher moisture level (30 %) caused cavity on starch granules. This study indicated that HMT increased RS content. The gels of modified starches were softer, having higher self-levelling properties (G′–G″).
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Abbreviations
- AICRP:
-
All India coordinated research project
- BSR:
-
Blanket state recommendations
- FFP:
-
Farmers’ fertilizer practices
- IBSR:
-
Improved blanket state recommendation
- IGP:
-
Indo-Gangetic plain
- INS:
-
indigenous nutrient supply
- MSP:
-
Minimum support price
- NHI:
-
Nutrient harvest index
- RIE:
-
Reciprocal Internal Efficiency
- SREY:
-
System rice equivalent yield
- SSNM:
-
Site-specific nutrient management
- STLR:
-
Soil testing laboratory recommendation
- UGP:
-
Upper Gangetic Plain
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Acknowledgments
The authors would like to gratefully acknowledge Director, NDRI, Karnal, India for extending Scanning Electron Microscope facilities and CCS Haryana Agriculture University, Hisar, India for providing the pearl millet variety.
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Sharma, M., Yadav, D.N., Singh, A.K. et al. Effect of Heat-Moisture Treatment on Resistant Starch Content as well as Heat and Shear Stability of Pearl Millet Starch. Agric Res 4, 411–419 (2015). https://doi.org/10.1007/s40003-015-0177-3
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DOI: https://doi.org/10.1007/s40003-015-0177-3