Hydrogenolytic depolymerization of procyanidin polymers from hi-tannin sorghum bran

作者：Li, Zheng; Zeng, Jijiao; Tong, Zhaohui; Qi, Yajing; Gu, Liwei^*

来源：Food Chemistry, 2015, 188: 337-342.

DOI：10.1016/j.foodchem.2015.05.021

• Catechin
• Epicatechin
• Procyanidins
• Depolymerization
• Hydrogenolysis

Depolymerization of procyanidin polymers into oligomers enhances their bioavailability and bioactivity because oligomers are bioavailable. Hydrogenolysis was applied in this study to depolymerize hi-tannin sorghum bran procyanidin polymers into oligomers. The yield and composition of oligomers under different hydrogenolysis conditions was investigated. Results showed that raising temperature from 50 to 100 degrees C significantly increased total yield of oligomers. Higher temperatures (150 and 200 degrees C) produced monomers with lower yield. The highest yield of oligomers (38.8%) was obtained using 1 MPa hydrogen whereas 3 MPa hydrogen in reaction vessel decreased yield. Total yield of oligomers reached the highest at 1-3 h and then decreased with prolonged reaction time. Yield increased with palladium-on-carbon (Pd/C, a catalyst) amount from 0.5 to 3 mg and plateaued with Pd/C amount from 3 to 10 mg. The maximum yield of produced oligomers was achieved under 100 degrees C, 1 MPa hydrogen pressure, 1-3 h, and 3-10 mg Pd/C.

• 出版日期2015-12-1
• 单位江南大学