Abstract: Objective: To study absorption value of macromolecular substances in liquid culture medium of four monomer in
Geranium strictipes on three kinds of cariogenic bacteria. Methods: The Streptococcus mutans, Actinomyces viscosus, Lactobacillus
acidophilus were tested as microbe to determinate absorption value of macromolecular substances in liquid culture medium of the four
monomer in Geranium strictipes on three kinds of cariogenic bacterias with different concentrations. Results: The Gallic acid, the
Methyl ester of Gallic acid, catechins, ellagic acid have an enhanced role to external leakage of macromolecular substances in liquid
culture medium to three kinds of cariogenic bacteria. With the time and drug concentration, the absorption value of substances in liquid
culture medium increases gradually, the growth rate was more obvious in 2~8 h, and the effect of most groups was better than that of the
positive control group. Conclusion: Four Monomers in Geranium strictipes have an enhanced role to external leakage of
macromolecular substances in liquid culture medium, which can destroy the integrity of bacterial cell membranes.

Key words: Geranium strictipes, cariogenic bacteria, absorption value, monomer