文献类型：期刊文献

英文题名：DYNAMIC EFFECTS OF ANAEROBIC FERMENTATION ON PROTEIN, FLAVONOIDS, NITRATE, AND NITRITE CONTENT AND BIOACTIVITIES OF MATURE LEAVES OF TOONA SINENSIS

作者：Su, S.[1] Geng, Y. H.[1] Ni, J. W.[1] Wang, W.[1] Xu, X. Q.[1]

第一作者：苏上

通信作者：Su, S[1]

机构：[1]Chinese Acad Forestry, Natl Forestry & Grassland Adm, Key Lab Tree Breeding & Cultivat, Res Inst Forestry, Beijing 100091, Peoples R China

年份：2024

卷号：34

期号：4

起止页码：862-874

外文期刊名：JOURNAL OF ANIMAL AND PLANT SCIENCES-JAPS

收录：;Scopus(收录号：2-s2.0-85202912735);WOS:【SCI-EXPANDED(收录号:WOS:001299572100004)】；

基金：Acknowledgements: This study was supported by the National Natural Science Foundation of China [grant number 31700603] , the Central Public-interest Scientific Institution Basal Research Funds [grant number CAFYBB2017QA004] and the Dazhu Forestry Research Funds [grant number C360] .

语种：英文

外文关键词：Feed; Quality; Nitrate and nitrite; Flavonoid; Antioxidant activity

摘要：Toona sinensis (TS) is a widely cultivated and economically valued tree in Asia. However, millions of tons of its nutritious mature leaves go unutilized due to excessive amount of nitrate and nitrite. In this study, the mature leaves of TS were chopped, vacuum-packed, and fermented for up to 18 weeks to evaluate their feeding potential. The dynamic effects of fermentation on quality indicators, including crude protein, flavonoids, nitrate and nitrite content, and antioxidant activity [radical 2,2-diphenyl-1-picrylhydrazyl (DPPH) scavenging activity, ferric-reducing antioxidant power (FRAP) and oxygen radical absorbance capacity (ORAC)] of mature leaves of TS were quantified every two weeks. Results showed that after fermentation for 6 weeks, the total content of nitrate and nitrite of TS leaves was significantly decreased (p p <= 0.05) from 4523.36 to 1102.20 mg/kg. The mean content of nutritional components, including crude protein (17.88 f 0.49%), flavonoids (792.24 f 50.78 mg/100 g), and antioxidant activity (317.62 f 44.70 mg/100 g for DPPH, 400.44 f 25.87 mg/100 g for FRAP, 473.74 f 37.17 mu M/g for ORAC) of TS leaves were well preserved between 6 to 14 weeks of fermentation. These results indicated that fermentation may provide a new way to utilize TS resources, and the fermented mature leaves of TS could be a novel, valuable feed supplement, especially for ruminants. Screening and inoculating TS leaves with an appropriate starter culture, such as lactic acid bacteria inoculants, during fermentation is recommended to further improve TS feed quality.