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| Application of Modified Chitosan as Bacteriostatic Agent in White Water |
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| DOI：10.11980/j.issn.0254-508X.2016.04.004 |
| Key Words:quaternary ammonium salt of chitosan isopropyl alcohol papermaking white water bacteriostatic effect compounding |
| Fund Project:“十二五”国家科技支撑计划项目(2013BAC01B03)。 |
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| Abstract:Natural chitosan (CTS) was first dissolved in acetic acid and fully swelled up with sodium hydroxide, then dehydrated by organic solvents. Subsequently the quatemary ammonium chitosan (QCS) with different substitution degrees were synthesized by the reaction of chitosan 2,3-epoxypropyl trimethyl ammonium chloride(ETA) in different ratio. Two strains including Gram negative E. coli and Gram positive S. aureus were selected for antibacterial tests because they are commonly found in papermaking white water. The antibacterial activities of QCS， isothiazolinone and their mixture were also investigated. Result indicated that isopropyl alcohol was better than ethyl alcohol using for dehydration, the yield of dehydrating chitosan with isopropyl alcohol reached to 60.3%, and 14.3 percentage points higher than the control sample. From the point of view of actual bacteriostatic effect and the production costs, the best n(CTS)∶n(ETA)was 1∶6. Chitosan quaternary ammonium salt was a broad-spectrum antibacterial agent, the best bacteriostatic performance was achieved by adding 20% quaternary ammonium salt of chitosan to isothiazolinone. |
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