Welcome to Acta Prataculturae Sinica ! Today is Share:

Acta Prataculturae Sinica ›› 2024, Vol. 33 ›› Issue (10): 159-170.DOI: 10.11686/cyxb2024016

Previous Articles    

Optimization of extraction process of Neolamarckia cadamba leaf polyphenols and its effect on Stylosanthes guianensis silage

Pei-shan HUANG(), Mei-qi ZANG, Wei-ling ZHANG, Jun-jian CHEN, Li-xuan LIU, Qing ZHANG()   

  1. College of Forestry and Landscape Architecture,South China Agricultural University,Guangdong Research Center of Woody Forage Engineering Technology,Guangzhou 510642,China
  • Received:2024-01-11 Revised:2024-02-29 Online:2024-10-20 Published:2024-07-15
  • Contact: Qing ZHANG

Abstract:

The purpose of this study was to investigate the optimal ultrasonic-assisted extraction conditions of Neolamarckia cadamba leaf polyphenols (NCLP) and its effect on Stylosanthes guianensis silage quality. The Box-Behnken design experiment in response surface analysis was used to optimize the process conditions of ultrasonic-assisted extraction ofNCLP. There were 3 treatments in the silage experiment: No addition (control, CK), 1%NCLP and 2% NCLP. After 30 days of ensiling, the nutrient composition and fermentation quality of S. guianensis silages with the above three treatments were measured. The results showed that the optimum extraction conditions were: a methanol concentration of 71%, a liquid∶solid of 30 mL·g-1, an extraction time of 37 min, and ultrasonic power of 250 W. Under the optimal conditions, the NCLP content was 136.82 mg Gallic acid equivalent(GAE)·g-1 DM. Compared with the control group, the NCLP addition treatments significantly reduced(P<0.01) the pH value, ammonia nitrogen content and rate of dry matter loss in S. guianensis silage, and significantly increased(P<0.01) lactic acid bacteria number, lactic acid and acetic acid content. Furthermore, the addition of 2% NCLP caused a significant decrease in the content of neutral detergent fiber and acid detergent fiber of the silage (P<0.05), while the contents of true protein increased significantly (P<0.05). In conclusion, the study obtained the optimum extraction process for the NCLP and found that NCLP had a positive effect on the fermentation quality of S. guianensis leaf silage, and the effect of 2% NCLP was better than that of 1% NCLP.

Key words: Neolamarckia cadamba leaf polyphenols, response surface methodology, silage quality