Patent ID: 8603552

Claim:
A method for producing a food product from Bacillus natto culture, said food product containing nattokinase and about 1 μg or less of vitamin K2/g dry weight, comprising: treating a Bacillus natto culture or culture supernatant with an inorganic coagulant in combination with a phosphorus-containing coagulant, wherein the inorganic coagulant is calcium chloride and the phosphorus-containing coagulant is at least one selected from the group consisting of disodium hydrogenphosphate, sodium dihydrogenphosphate, potassium dihydrogenphosphate and tripotassium phosphate, and filtrating the Bacillus natto culture or culture supernatant and the inorganic coagulant in combination with the phosphorus-containing coagulant, thereby removing vitamin K2 from the Bacillus natto culture or culture supernatant while nattokinase is retained in the Bacillus natto culture or culture supernatant.