| abstract |
The present invention is directed to a fermentation medium and fermentation method using said fermentation medium, wherein the fermentation medium comprises a basal medium and a chelating agent having the formula (i) r1ch (coox1) -n (ch2coox1) 2 wherein r1 is selected from hydrogen, linear or branched C1 -C4 alkyl, phenyl, benzyl, ch2oh and ch2ch2coox1, x1 is (mxh1-x), m being a monovalent cation, preferably selected from ammonium or alkali metal or combinations of at least two of the above, x is in the range from zero to 1, where x is an average value. |