Method for producing vitamin K2 from culture of

1. A method for producing vitamin K2, comprising:

culturing Bacillus natto in a liquid medium to obtain a Bacillus natto culture or culture supernatant thereof, wherein the culture or culture supernatant contains vitamin K2;

treating the 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, so as to form a coagulant to which vitamin K2 from the Bacillus natto culture or culture supernatant is absorbed or aggregated;

separating the coagulant to which vitamin K2 is absorbed or aggregated from the treated culture or culture supernatant;

treating the coagulant to which vitamin K2 is absorbed or aggregated with an organic solvent for extraction;

collecting an organic solvent extract;

removing the organic solvent from the organic solvent extract; and

obtaining an oily product that contains vitamin K2 from the extract from which the organic solvent has been removed.

2. The method of claim 1 , wherein the separation is performed by filtration so as to obtain the coagulant to which vitamin K2 is absorbed or aggregated as a filtration residue.