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Citation: SONG Zhi-Gang, WANG Jian-Hua, WANG Han-Zhong, ZHAO Ai-Hong, LIU Chun-Xiao, TIAN Ji-Chun. Properties of Starch from Radix Pueraria Thomsonii[J]. Chinese Journal of Applied Chemistry, ;2006, 23(9): 974-977. shu

Properties of Starch from Radix Pueraria Thomsonii

1.
Shandong Key Laboratory of Crop Biology/Shandong Agricultural University, College of Agronomy, College of Life Science, Taian 271018

Corresponding author: WANG Jian-Hua,
Received Date: 16 September 2005
Available Online: 25 February 2006
Fund Project: 山东省优秀中青年科学家奖励基金(03BS049) (03BS049)

The physicochemical properties of Radix Pueraria thomsonii starch were investigated and compared with that of potato starch.The results show that Radix Pueraria thomsonii starch contains an apparent amylose content of 35.7%,much higher than that of potato starch(23.6%),and has a granule size between 5~20 μm with round,and polygonal shapes.Radix Pueraria thomsonii starch shows a strong 2θ intensity at 15°,17° and 23°,and medium intensity at 22°.It displays A type X-ray diffraction pattern,different from that of potato.The peak and cold viscosity of Radix Pueraria thomsonii starch were higher than the corresponding ones of potato starch.Radix Pueraria thomsonii starch also has lower breakdown and higher setback.It's pasting temperature is 75℃,higher than the one determined for potato starch,64.3℃.At 25℃,4% Radix Pueraria thomsonii and potato starch pastes both behaved as pseudoplastic characteristics.The flow index of Radix Pueraria thomsonii and potato starch pastes were 0.62 and 0.52.The shear stress and apparent viscosity of Radix Pueraria thomsonii starch pastes were lower than the corresponding ones of potato starch pastes at low shear rate,but were higher at high shear rate,showing higher resistance to shear-thinning.
- Radix Pueraria thomsonii starch,
- pasting properties,
- X-ray diffraction,
- rheology
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