微生物含量对瓜尔胶水溶液黏度的影响研究

Study on influences of microbial contents on viscosity of guar gum aqueous solution

对(不同微生物含量)瓜尔胶粉水溶液的黏度随时间而降低的规律、杀菌剂的种类和用量对抑制胶液黏度降低的效果进行了研究。结果表明:瓜尔胶中含有的微生物会导致其水溶液久置后黏度降低,瓜尔胶水溶液放置时间越长(或微生物含量越高),黏度降低幅度越大;当w(D581杀菌剂)=0.3%时(相对于瓜尔胶粉质量而言),其抑制微生物生长的效果较好,表现为48 h内胶液(微生物含量为6×104 CFU/g)黏度降幅较低(仅为0.5%)。

The debasing rule of viscosity with extension of placed time, the restraining effect of antiseptics types or contents on debasing viscosity were investigated for gnar gum aqueous solution with different microbial contents. The results showed that the placed time was longer, the debasing speed of viscosity was faster for guar gum aqueous solution because microbial contents were increased with extension of placed time. The restraining effect of antiseptic of D581 on microbe was better because the viscosity after 48 h was only 0.5% less than after 0 h when mass fraction of D581 was 0.3% in guar gum powder for guar gum aqueous solution （namely microbial contents at 6×10^4 CFU/g）.