赤藓糖醇和木糖醇对变异链球菌生长和产酸作用的对比研究

目的对比相同浓度下赤藓糖醇和木糖醇对变异链球菌生长和产酸的影响。方法分别用含0.5%、1%、2%、4%、8%、12%、16%赤藓糖醇和木糖醇的TPY培养基在厌氧条件下培养变异链球菌，分别于0、2、4、6、8、10、12、18、24 h测量液体培养基的光密度值（A值）和pH值，运用SPSS描绘其变化曲线图。结果在0.5%、1%、2%浓度下，赤藓糖醇培养基的A值较木糖醇培养基高，pH值较木糖醇培养基低，说明变异链球菌在含0.5%、1%、2%赤藓糖醇的培养基内的生长和产酸能力明显较相同浓度木糖醇培养基高。在8%、12%、16%浓度下，赤藓糖醇培养基的A值较木糖醇培养基低，pH值较木糖醇培养基高，说明变异链球菌在含8%、12%、16%赤藓糖醇的培养基内的生长和产酸能力明显较相同浓度木糖醇培养基低。结论对比木糖醇，低浓度下赤藓糖醇对变异链球菌生长和产酸的抑制作用较弱，高浓度下赤藓糖醇的抑菌效果更强。

Contrasting study of erythritol and xylitol on Streptococcus mutans

Objective To study the inhibitory effect of erythritol by contrast to xylitol on growth and acid production of Streptococcus mutans(S.mutans).Methods S.mutans were incubated respectively in 0.5%,1%,2%,4%,8%,12%,16% erythritol or xylitol culture medium under anaerobic conditions.The A and pH value of the mediums were measured at 0,2,4,6,8,10,12,18,24 hours, following the profile plots by SPSS.Results The data of A were higher in 0.5%,1%,2% erythritol culture medium than in xylitol culture medium at the same concentration, while lower in 8%,12%,16% erythritol culture medium than in xylitol culture medium at the same concentration.The data of pH were lower in 0.5%,1%,2% erythritol culture medium than in xylitol culture medium at the same concentration, while higer in 8%,12%,16% erythritol culture medium than in xylitol culture medium at the same concentration.It indicated that the growth and acid production of S.mutans were higer in 0.5%,1%,2% erythritol culture medium than in xylitol culture medium at the same concentration, while lower in 8%,12%,16% erythritol culture medium than in xylitol culture medium at the same concentration.Conclusion Compared with xylitol,erythritol in low concentration has weaker effort on the growth and acid production of S.mutans,while having stronger effort in high concentration.