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Int. J. Mol. Sci. 2010, 11(8), 3002-3015; doi:10.3390/ijms11083002

Impact of the Soak and the Malt on the Physicochemical Properties of the Sorghum Starches

1
State Key Laboratory of Food Science and Technology, Jiangnan University, Lihu Road 1800, Wuxi 214122, China
2
School of Food Science and Technology, Jiangnan University, 1800 Lihu, Wuxi 214122, China
3
Université du Burundi, Institut Supérieur d’Agriculture, Département de TIAA. BP. 35 Gitega, Burundi
*
Author to whom correspondence should be addressed.
Received: 22 June 2010 / Revised: 25 July 2010 / Accepted: 26 July 2010 / Published: 16 August 2010
(This article belongs to the Section Physical Chemistry, Theoretical and Computational Chemistry)
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Abstract

Starches were isolated from soaked and malted sorghum and studied to understand their physicochemical and functional properties. The swelling power (SP) and the water solubility index (WSI) of both starches were nearly similar at temperatures below 50 °C, but at more than 50 °C, the starch isolated from malted sorghum showed lower SP and high WSI than those isolated from raw and soaked sorghum. The pasting properties of starches determined by rapid visco-analyzer (RVA) showed that malted sorghum starch had a lower viscosity peak value (86 BU/RVU) than raw sorghum starch (454 BU/RVU). For both sorghum, X-ray diffractograms exhibited an A-type diffraction pattern, typical of cereal starches and the relative degrees of crystallinity ranged from 9.62 to 15.50%. Differential scanning calorimetry (DSC) revealed that raw sorghum starch showed an endotherm with a peak temperature (Tp) at 78.06 °C and gelatinization enthalpies of 2.83 J/g whereas five-day malted sorghum starch had a Tp at 47.22 °C and gelatinization enthalpies of 2.06 J/g. Storage modulus (G′) and loss modulus (G″) of all starch suspensions increased steeply to a maximum at 70 °C and then decreased with continuous heating. The structural analysis of malted sorghum starch showed porosity on the granule’s surface susceptible to the amylolysis. The results showed that physicochemical and functional properties of sorghum starches are influenced by soaking and malting methods. View Full-Text
Keywords: sorghum; malt; soak; starch; X-ray diffractograms; RVA; DSC; crystallinity sorghum; malt; soak; starch; X-ray diffractograms; RVA; DSC; crystallinity
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MDPI and ACS Style

Claver, I.P.; Zhang, H.; Li, Q.; Zhu, K.; Zhou, H. Impact of the Soak and the Malt on the Physicochemical Properties of the Sorghum Starches. Int. J. Mol. Sci. 2010, 11, 3002-3015.

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