Production method for useful substance

Abstract

The present invention provides a method, of producing a useful substance, including secreting and producing a useful substance in broth by yeast contained in the broth, the yeast being a Saccharomyces strain, the broth containing a compound (A) represented by a formula (1), the compound (A) having an HLB value of 0.1 to 16 and a number average molecular weight of 200 to 30000, the weight percentage of the compound (A) based on the weight of the broth being 0.0001 to 10 wt %: HO—(A1O)m1-(A2O)m2-(A3O) m3—H   (1) wherein A1O, A2O, and A3O each independently represent a C2-C4 oxyalkylene group; A1O and A2O have different structural formulas, A2O and A3O have different structural formulas; and m1, m2, and m3 each respectively represent the average number of moles of A1O, A2O, and A3O added, and are each independently a number in the range of 1 to 600.

Dependencies are inferred from the claim text.