三聚氰胺对嗜热链球菌生长影响的研究

Study on the effect of melamine on the growth of Streptococcus thermophilus

通过在MRS液体培养基里分别添加0‰、0.25‰、0.5‰、1‰、2‰、3‰及饱和的三聚氰胺,接种嗜热链球菌,在42℃下培养48h,通过测定培养液的pH变化和计数细菌总数来考察三聚氰胺对嗜热链球菌生长的影响。结果表明:嗜热链球菌不能以三聚氰胺为氮源物质而加以降解利用,三聚氰胺在水溶解度范围内对嗜热链球菌的生长没有促进作用,只有微弱的抑制效果。

MRS liquid mediums added respectively with 0‰,0.25‰,0.5‰,1‰,2‰,3‰ and saturation concentration melamine were used to cultivate Streptococcus thermophilus.After 48h at 42℃ in the culture medium,the impaction of melamine on the growth of Streptococcus thermophilus was tested through measuring the pH of the medium and calculating the final total number of bacteria.The experimental results showed that melamine couldn＇t be used and degraded by Streptococcus thermophilus as a nitrogen and melamine within the water solubility couldn＇t promote the growth of Streptococcus thermophilus while it had a little inhibition effect on the growth of it.