Abstract
The ability of Rhodococcus fascians cells to degrade limonin and limonin species (limonoate, limonoate-D-ring lactone and limonoate-A-ring lactone) was checked against pH. These studies showed a marked effect of pH on cell growth mainly due to substrate availability (limonin species). Evolution of limonin and its species within the medium were followed at different pH values. The best substrate for Rhodococcus fascians at pH 7.0 was limonoate whereas at pH 4.0 to 5.5 it appeared to be limonin. Results suggest that the citrus juice debittering process start only once the natural precursor of limonin (limonoate A ring lactone) has been transformed into limonin, the equilibrium displacement being governed by the citrus juice pH.
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