Broad Spectrum Anti-Quorum Sensing Activity of Tannin-Rich Crude Extracts of Indian Medicinal Plants

Table 1

Quantitative studies of anti-quorum sensing activity detected as pigmentation in C. violaceum ATCC 12472 in the presence of subinhibitory concentrations of plant extracts.

Plant	% pigmentation with respect to untreated control ( = MIC in mg/mL)
	P. emblica	7.29 ± 12.36	29.58 ± 8.66	41.70 ± 6.19	66.50 ± 2.82	102.84 ± 8.94
T. bellirica	0.57 ± 1.00	19.66 ± 8.79	28.54 ± 8.9	56.63 ± 6.01	68.39 ± 12.13
T. chebula	0.00	2.02 ± 2.93	21.22 ± 4.61	47.85 ± 5.40	72.18 ± 9.45
P. granatum	20.08 ± 6.78	23.21 ± 7.86	25.75 ± 8.54	32.17 ± 3.49	72.05 ± 11.26
S. cumini	0.72 ± 0.66	5.64 ± 5.32	12.88 ± 7.72	28.70 ± 6.86	78.53 ± 19.27
M. indica (flower)	6.48 ± 0.42	28.59 ± 12.61	34.19 ± 12.08	72.33 ± 6.49	87.05 ± 8.43
E. ribes	13.34 ± 6.21	30.60 ± 6.02	51.19 ± 3.83	89.49 ± 14.54	90.18 ± 4.00
A. arabica	5.56 ± 3.52	42.50 ± 7.11	56.68 ± 2.25	109.21 ± 31.91	119.58 ± 13.93
M. indica (seed)	4.83 ± 1.76	47.05 ± 3.20	61.47 ± 8.58	76.55 ± 17.50	87.87 ± 4.97
T. arjuna	3.20 ± 2.86	46.26 ± 4.52	71.40 ± 15.54	88.89 ± 15.45	96.54 ± 3.83
C. equisetifolia	6.93 ± 2.54	16.85 ± 3.72	59.94 ± 10.98	89.43 ± 11.55	86.55 ± 13.10
T. populnea	0.01 ± 0.01	10.14 ± 9.74	56.16 ± 9.55	68.72 ± 11.66	80.09 ± 8.92