Ảnh hưởng của thời gian ủ đến tỷ lệ nảy mầm và thời gian sinh trưởng đến chất lượng cỏ lúa mạch, nếp ngự và nếp than

Abstract

This study aims to investigate the optimal sprouting duration for achieving high germination rates, the variations in water, polyphenol and chlorophyll contents over time from day 3 to day 8 in rice grass, as well as the GABA content and antioxidant capacity of three rice varieties: barley, nep ngu, and nep than. The results show that the optimal incubation times for achieving high germination rates were 18 hours for barley, 40 hours for nep ngu, and 48 hours for nep than. The optimal harvest time for the grasses to achieve the highest polyphenol and chlorophyll content was as followed: barley on the 7^th day after sprouting (polyphenol: 3.41 mg GAE/g, chlorophyll: 19.75 mg/g), nep ngu on the 6^th day after sprouting (polyphenol: 3.68 mg GAE/g, chlorophyll: 19.07 mg/g), and nep than on the 5^th day after sprouting (polyphenol: 2.50 mg GAE/g, chlorophyll: 9.79 mg/g). The highest GABA content was recorded in barley grass (4.79 mg/g), followed by nep ngu grass (4.22 mg/g), and nep than grass (2.39 mg/g). Additionally, all grasses demonstrated antioxidant activity, with nep than grass exhibiting the strongest activity, with an IC₅₀ value of 319.20 µg/mL.