esides,
no γ -PGA was produced in the absence of K+ or Mg2+ in the Bacillus sp. RKY3 [8]. The results of our previous studies showed that
the K+ phenomenon was also present in B. subtilis GXA-28. However, the relationships between K+ and cell growth, γ -PGA yield,
stereochemical composition, molecular weight and broth viscosity
have not been investigated in γ -PGA producing strain.