Table 4.

Effect of sub-MICs of methanolic extract of Psoralea corylifolia (seed) on inhibition of quorum sensing-regulated virulence factors in Aeromonas hydrophila WAF-38.

Concentration (μg/ml)	Total proteasea	EPS productionb
Control	0.589 ± 0.051	0.748 ± 0.021
100	0.356 ± 0.016 (39.5)	0.530 ± 0.039 (29.1)
200	0.298 ± 0.029 (49.4)*	0.364 ± 0.026(51.3)*
400	0.278 ± 0.010 (52.8)*	0.29 ± 0.013 (61.2)**
800	0.203 ± 0.004 (65.5)**	0.255 ± 0.013 (69.9)**

^aTotal protease activity is expressed as the absorbance at OD₆₀₀.

^bEPS production is expressed as absorbance at OD₄₈₀.

All the data are presented as mean ± SD.

^*significance at p ≤ 0.05,

^**, significance at p ≤ 0.005.

Values in the parentheses indicate percent reduction over control.