Enzymatic activity of Lactobacillus reuteri grown in a sweet potato based medium with the addition of metal ions

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Table 3 Effect of metal ions on β -glucosidase activity (Glu U/mL) produced by L. reuteri

	β-Glucosidase activity (Glu U/mL)*
*L. reuteri*	Control	Fe²⁺	Ca²⁺	Na⁺	K⁺	Mg²⁺	Mn²⁺
MF14-C	6.94	11.46	9.66	11.18	13.71	10.15	12.30
MF14-C	±1.29^cC	±1.66^abC	±2.17^bC	±1.60^abC	±1.70^aBC	±1.74^bD	±1.29^aB
CF2-7F	10.11	18.02	21.93	16.86	10.52	13.60	16.71
CF2-7F	±1.58^cB	±2.21^aAB	±2.05^aA	±1.12^abB	±1.30^cD	±1.13^bC	±1.93^abA
DSM20016	12.04	21.05	22.45	18.24	26.22	20.57	16.87
DSM20016	±1.05^dB	±2.23^bA	±1.70^bA	±1.75^bcB	±1.09^aA	±1.28^bAB	±1.08^cdA
SD2112	7.59	17.21	17.44	10.46	15.59	17.50	13.28
SD2112	±1.20^cdC	±1.94^aAB	±1.90^aB	±1.69^cC	±1.11^abB	±1.72^aBC	±1.50^bcB
MM7	7.92	19.32	17.57	12.37	12.59	14.28	9.82
MM7	±0.88^cC	±2.94^aAB	±1.70^aB	±1.75^bC	±1.83^bCD	±1.60^abC	±1.68^cC
MM2-3	17.82	23.60	22.70	23.48	24.79	22.57	17.52
MM2-3	±1.45^bA	±2.27^aA	±3.27^aA	±3.21^aA	±2.60^aA	±3.24^aA	±2.06^bA

*Data points with different lower case letters in the same row are significantly (p < 0.05) different. Data points with different upper case letters in the same column are significantly (p < 0.05) different.