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Citation: LIN Li-jing, TONG Zhang-Fa, ZHAO Yi-Ling, LIAO Dan-Kui, ZHANG You-Quan. Properties and Structures of Cassava Starch Phosphate Monoesters[J]. Chinese Journal of Applied Chemistry, ;2006, 23(3): 294-298. shu

Properties and Structures of Cassava Starch Phosphate Monoesters

1.
School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004

Corresponding author: TONG Zhang-Fa,
Received Date: 19 June 2005
Available Online: 8 October 2005
Fund Project: 国家教育部优秀青年教师基金资助项目(教人2002-40) (教人2002-40)

The cassawa starch phosphate monoesters with a high degree of substitution(CSP-HDS) were prepared via the dry process with sodium tripolyphosphate(STP) as esterifying agent.The physicochemical properties of CSP-HDS were investigated and the structures were characterized.CSP-HDS with a DS of 0.073 had a maximum apparent viscosity of 2.656 Pa·s,CSP-HDS with a DS of 0.055 had the highest transparency of 85.6%,and CSP-HDS with a DS of 0.073 had the best stability of freeze-thaw and no water was separated from the gel after freeze-thaw for 5 times.Compared with native starch,CSP-HDS shows higher viscosity,its gelation temperature is lower and gelation time is shorter.CSP-HDS with DS>0.064 dissolves in water at room temperature,its paste transparency and freeze-thaw stability are improved.The FTIR results show that the peak at 1 016 cm^-1 is enhanced,indicating the group of phosphate has been induced in starch molecule.The XRD results indicate that the esterification of starch mainly occurs in the amorphous region and less in the crystalline region.The absorbency of the starch-iodine composite is decreased,indicating that the helix structure of cassawa starch has been partly destroyed.
- cassawa starch phosphate monoester,
- physicochemical property,
- structure characterization
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