华西口腔医学杂志

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对氨基苯甲酸对变形链球菌生长影响的体外实验

郭斌,周学东,肖晓蓉,胡涛,朱硃,李蕾   

  1. 610041 四川大学华西口腔医学院
  • 收稿日期:2001-10-25 修回日期:2001-10-25 出版日期:2001-10-20 发布日期:2001-10-20
  • 基金资助:
    本课题为国家自然科学基金资助项目(编号39670785)

Effects of Para-aminobenzoic Acid (PABA) on Growth of Streptococcus mutans

Guo Bin, Zhou Xuedong, Xiao Xiaorong, et al   

  1. College of Stomatology,West China University of Medical Sciences
  • Received:2001-10-25 Revised:2001-10-25 Online:2001-10-20 Published:2001-10-20

摘要:

目的:探讨不同浓度的对氨基苯甲酸(PABA)对变链菌生长的影响。方法:将变形链球菌ATCC25175(血清c 型)在改良Carlsson培养基中厌氧培养,实验组在其中加入不同浓度(10-10~10-3gPL)的PABA液厌氧培养48 h后采用紫外可见分光光度仪测定细菌浓度OD值(K=550 nm),并在琼脂平板上培养观察细菌生长情况,进行菌落计数。结果:菌液比浊及菌落计数结果均表明PABA确有促进变链菌生长的能力,当PABA的浓度从10-10~10-4gPL增大时,其促进变链菌生长的能力增强,但当PABA浓度增大到10-3gPL,则促进变链菌生长的能力开始下降。当PABA 浓度为10-9~10-3gPL时,实验组的细菌生长明显高于对照组(P<0105)。结论:当PABA的浓度为10-4gPL时,其促进变链菌生长的能力达最强,高于或低于此浓度,这种促生长作用均下降。

关键词: 变形链球菌, 对氨基苯甲酸, 微生态, 共生

Abstract:

Objective:The aim of this study is to examine effects of para-aminobenzoic acid (PABA) on the growth ofStreptococcus mu- tans(S.mutans).Methods:Different concentrations of PABA (10-10~10-3gPL) were separately transferred to modified Carlsson medium.S.mutans(ATCC 25175) grew in modified Carlsson mediumwith different concentrations of PABA. All cultureswere incubated at 37eanaerobically in an atmosphere of 80% of nitrogen (vPv), 10% of hydrogen (vPv) and 10% of carbon dioxide (vPv) for 48 hours. The absorbance values ofS.mutanswere measured by using a spectrometer (UV-1601). The colony forming units (CFU) were obtained by growingS.mutansinmediawith different concentrations of PABA(10-10~10-3gPL).Results:Dif- ferent concentrations of PABAhad different stimulating effects on the growth ofS.mutans(P<0.05). But this kind of stimulat- ing effects declined when the concentration of PABAwas 10-3gPL.Conclusion:This experiment indicates PABAhas stimulating ef- fects on the growth ofS.mutans, and PABA can promote growth ofS.mutans.

Key words: Streptococcus mutans, para-aminobenzoic acid, microbial ecology