[A comparative study of phenoloxidase activity between Cipangopaludina chinensis and Oncomelania hupensis ].

Objective: To study the differences of the phenoloxidase (PO) relative activity among ribbed shelled Oncomelania hupensis , smooth shelled O. hupensis and Cipangopaludina chinensis .
Methods: The crude PO fluid was extracted from the soft tissue of O. hupensis and C. chinensis by homogenation and centrifugation. The PO activity was detected with catechol as the substrate in the reaction systems.
Results: The PO relative activities in the ribbed shelled O. hupensis , smooth shelled O. hupensis and C. chinensis were (25.72 ± 2.27), (14.56 ± 1.24) U / mL and (13.72 ± 1.06) U / mL. The PO relative activity in the smooth shelled O. hupensis was higher than that in the ribbed shelled O. hupensis ( q = 21.46, P < 0.05) and C. chinensis ( q = 12.00, P < 0.05), while the difference between the PO relative activities of the latter two was not statistically significant ( q = 1.62, P > 0.05) .
Conclusions: There is a difference in the relative PO activity between O. hupensis and C. chinensis , which may be related to the living environment of snails.