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Abstract
This study investigated the effects of increase in temperature and in pH of Coca-Cola,
Afri-Cola, Pepsi-Cola and Krest bitter lemon drinks (“soft drinks”) produced in Nigeria
on the in vitro motility of spermatozoa. Semen was collected from 7 men, average age 28 years, of
proven fertility, after 5 days' abstinence from sexual intercourse. The temperature
and pH of the drinks were adjusted from 22 °C (room) to 37 °C, and pH 2.4 (acid) to
7.5 (alkaline), respectively. The mean % motility of spermatozoa in the adjusted and
in the unadjusted drinks was compared for significant differences at the 1% level
using the student's t-test. The results showed no significant differences in mean
% motility in the drinks at 22 °c and at 37 °C. The mean % motility in all the drinks,
except Coca-Cola, was significantly greater at alkaline than at acid pH; for Coca-Cola,
motility was significantly greater at acid than alkaline pH. Of the drinks, Krest
bitter lemon (unadjusted) immobilized all spermatozoa within 1 minute of addition.
Conclusion: i) alkalinity decreases the spermicidal action of all drinks except Coca-Cola,
and ii) Krest bitter lemon may achieve very high efficacy if used as post-coital douche,
especially in the impoverished, densely populated Third World.
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Article info
Publication history
Accepted:
October 13,
1992
Received:
May 28,
1992
Identification
Copyright
© 1992 Published by Elsevier Inc.
