Association of Bio-energy Processing-Induced Protein Molecular Structure Changes with CNCPS-Based Protein Degradation and Digestion of Co-products in Dairy Cows

作者：Li, Xinxin; Zhang, Yonggen^*; Yu, Peiqiang^*

来源：Journal of Agricultural and Food Chemistry, 2016, 64(20): 4086-4094.

DOI：10.1021/acs.jafc.6b00688

• protein molecular structure
• CNCPS-based protein degradation and digestion
• co-products from bio-energy processing

The primary objective of this study was to develop a model to predict Cornell Net Carbohydrate Protein System (CNCPS) protein degradation and digestion based on protein molecular structure changes induced by bio-energy processing in different types of co-products (CoPR, CoPC, CoPS = co-products from bioprocessing of rapeseed, canola seed, and soybean, respectively). The results showed that the inherent structure changes induced by the processing had a close relationship with CNCPS predicted protein degradable, undegradable, and digestible contents. The amide I to II ratio and alpha-helix to beta-sheet ratio could be used to predict total degradable protein (R-2 = 0.99, RSD = 0.84, P < 0.001). Total CNCPS intestinal digestible protein could be predicted by protein structure alpha-helix to beta-sheet ratio (R-2 = 0.93, RSD = 0.33, P < 0.001). In conclusion, the processing induced protein molecular structure changes were highly linked to protein nutritive value of the co-products and could be used as predictors for CNCPS protein degradation and digestion in dairy cattle.

• 出版日期2016-5-25
• 单位东北农业大学; Saskatoon; Saskatchewan