RT Journal T1 DYNAMIC EFFECTS OF ANAEROBIC FERMENTATION ON PROTEIN, FLAVONOIDS, NITRATE, AND NITRITE CONTENT AND BIOACTIVITIES OF MATURE LEAVES OF TOONA SINENSIS A1 Shang Su A1 Yonghang Geng A1 Jianwei Ni A1 Wei Wang A1 Xinqiao Xu JF Journal of Animal and Plant Sciences JO JAPS SN 1018-7081 VO 34 IS 4 SP 862 OP 874 YR 2024 FD 2024/08/25 DO DOI https://doi.org/10.36899/JAPS.2024.4.0771 AB

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 ≤ 0.05) from 4523.36 to 1102.20 mg/kg. The mean content of nutritional components, including crude protein (17.88 ± 0.49%), flavonoids (792.24 ± 50.78 mg/100 g), and antioxidant activity (317.62 ± 44.70 mg/100 g for DPPH, 400.44 ± 25.87 mg/100 g for FRAP, 473.74 ± 37.17 μM/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 furtherimprove TS feed quality.

K1 Feed, Fermentation, Nitrate, Flavonoid, Antioxidant activity PB Pakistan Agricultural Scientists Forum LK https://thejaps.org.pk/AbstractView.aspx?mid=2022-JAPS-555