可再分散甲壳素纳米纤维的制备及其在稳定Pickering乳液中的应用

Preparation of Redispersible Chitin Nanofibers and Its Application in Stabilizing Pickering Emulsion

利用氯乙酸对部分脱乙酰化甲壳素进行羧甲基化处理,获得同时带有氨基和羧基的甲壳素纳米纤维(chitin nanofibers,ChNFs),所得ChNFs经干燥除去分散介质后可再次分散在超纯水中,再分散前后ChNFs的长径比变化不大。ChNFs还可以有效稳定Pickering乳液,流变学结果显示乳液类型为O/W型乳液,当ChNFs质量分数大于0.5%时,所稳定的乳液(油相质量分数为10%)在90 d贮藏期内均表现出良好的稳定性。此外,ChNFs能在较大pH值范围(3~11)内稳定乳液。总体来看,ChNFs可作为一种新型Pickering稳定剂应用于食品生物领域保护和递送对pH值敏感的活性物质。

Chitin nanofibers(ChNFs)with both amino and carboxyl groups were obtained by carboxymethylation of partially deacetylated chitin(DE-chitin)with chloroacetic acid.ChNFs could be dispersed again in deionized water after drying and removing the dispersing medium.The aspect ratio of ChNFs had little change before and after dispersion.Further,ChNFs could effectively stabilize oil-in-water(O/W)Pickering emulsions.The emulsion(comprising 10%oil)stabilized with ChNFs at concentrations greater than 0.5%was stabile for 90 days.In addition,ChNFs could stabilize the emulsion in a wide pH range(3–11).Overall,ChNFs is expected to be used as a novel Pickering stabilizer to protect and deliver pH-sensitive active substances in the field of food biology.