Kaushal, P., Majumdar, S., Singh, K. and Agarwal, S.K. 1997. The effect of hexachlorophene on in vitro mortality and some enzyme systems of swine kidney worm Stephanurus dentatus. J. Appl. Anim. Res., 11: 49–56. Adult Stephanurus dentatus obtained from the kidney and nodulated fat found around the kidney of common Indian pig (Sus scrofa) were exposed to 10−4 and 10−5M hexachlorophene at 37 C. The mortality of the parasites was observed after an exposure of 30 minutes in 10−4 M and an hour in 10−5M hexachlorophene. The effect of compound was also studied on various enzyme systems in the homogenates of the treated worms. Hexachlorophene in the concentration of 10−4M inhibited oxaloacetate reduction by 51% and 78%, and malate oxidation by 24% and 29% whereas, 10−5 M concentration caused an inhibition of 41% and 54% oxaloacetate reduction and 11% and 17% malate oxidation in male and female S. dentatus, respectively. Acid phosphomonoesterase activity was inhibited by 28% in male and 37% in female parasites with 10−4M hexachlorophene. The same concentration reduced the alkaline phosphomonoesterase activity by 75% and 80% in males and females, respectively. 10−5M hexachlorophene also caused a significant reduction of these enzymes. However, cholinesterase activity did not show any change upon hexachlorophene administration.