noted that as a calculation method of the percent recovery of non polymer catechins in other words the percent residue of catechins by the ethanol immersion a calculation was made under the assumption that the concentration of catechins in a tea extract composition with non polymer catechins contained therein said composition having been obtained by adding hot water of 85 u00b0 c 22 500 g to a stainless steel container with tea leaves 1 500 g not subjected to ethanol immersion contained therein conducting extraction for 10 minutes filtering the mixture through a 150 mesh screen cooling the filtrate down to 25 u00b0 c and then removing fine powder at 10 000 rpm in a de laval centrifugal separator was 100 wt next hot water of 85 u00b0 c 22 500 g was charged into a stainless steel container the tea leaves recovered after the ethanol immersion were charged in their entirety into the stainless steel container and extraction was conducted for 10 minutes the mixture was filtered through a 150 mesh screen the filtrate was cooled down to 25 u00b0 c fine powder was then removed at 10 000 rpm in a de laval centrifugal separator to obtain as an example product a tea extract composition 1 with non polymer catechins contained therein the brix degree and catechin concentration of the extract composition were 3 51 and 773 4 mg 100 ml respectively the.