Optimum conditions for the water extraction of L-theanine from green tea. - PubMed - NCBI
temperature, extraction time, ratio of water-to-tea and tea particle sizes had significant impacts on the extraction yield of theanine. The optimal conditions for extracting theanine from green tea using water were found to be extraction at ‘‘‘80 °C for 30 min with a water-to-tea ratio of 20:1 mL/g ‘‘‘and a tea particle size of 0.5-1 mm.