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Citation: ZHOU Xiao-Hua, LU Yao. Thermal Oxidation of Hydrolytic Collagen and the Mechanism of CaSO₄ Formation[J]. Chinese Journal of Applied Chemistry, ;2005, 22(3): 326-330. shu

Thermal Oxidation of Hydrolytic Collagen and the Mechanism of CaSO₄ Formation

ZHOU Xiao-Hua ^, ,
LU Yao

1.
College of Chemical Engineering, Chongqing University, Chongqing 400044

Corresponding author: ZHOU Xiao-Hua,
Received Date: 25 May 2004
Available Online: 18 September 2004

Thermal oxidation of hydrolytic collagen and the mechanism of CaSO₄ format ion in the presence of both L-ascorbic acid and H₂O₂ have been investigated.The results show that the SO₂ content in the protein is affected by L-ascorbic acid,H₂O₂,temperature and pH of the reaction system.In the presence of L-ascorbic acid and H₂O₂,free Met could be oxidized,giving SO₂ within 4 min when temperature is above 65℃.At a ratio of V(hydrolytic collagen):V(H₂O₂):m(L-ascorbic acid)=100:5:1 and 75℃,the concentration of SO₂ in hydrolytic collagen is decreased from 5.13×10^-3 g/mL to 0.1×10^-3 g/mL within 20 min,and is then increased to 3.46×10^-3 g/mL at 60 min.Thus,the mechanism of CaSO₄ formati on could be considered as follows.Under acid condition,H₂O₂ at first reacts with L-ascorbic acid,giving peroxy ascorbic acid,the latter then oxidizes HSO-₃,-S-S-and CH₃-S-in the hydrolytic collagen,giving SO₄^2- at last,resulting to the formation of CaSO₄ precipitate if there is Ca²⁺ in the system.
- hydrolytic collagen,
- L-ascorbic acid,
- H₂O₂,
- thermal oxidation,
- CaSO₄
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Thermal Oxidation of Hydrolytic Collagen and the Mechanism of CaSO₄ Formation