摘要
利用甘油磷酸钠(GP)为交联剂,通过羟丙基壳聚糖(HPCS)与脱氢枞酸缩水甘油酯(GDHA)间的接枝反应,制得GDHA接枝HPCS(GDHA-g-HPCS);用FT-IR、^(1)H NMR和UV表征中间体和产物结构,元素分析法测定HPCS的取代度(D_(S))和GDHA-g-HPCS的接枝度(D_(G)),表面张力法探讨GDHA-g-HPCS的表面活性,苯-水乳液稳定时间法评价GDHA-g-HPCS的乳化能力,倒瓶法确定GDHA-g-HPCS交联产物的凝胶形成时间。研究结果表明:对于D_(S)为110.6%的HPCS,当D_(G)从0.72%增至10.54%时,对应的GDHA-g-HPCS的临界胶束浓度从761.9 mg/L降至189.4 mg/L,但最小表面张力(γ_(min))都在45 mN/m左右;GDHA-g-HPCS对苯-水的乳化能力随D_(G)的增加呈先增后减的趋势;2 g/L的GDHA-g-HPCS(D_(G)为2.81%)为稳定剂得到的苯-水乳液稳定时间为18063 s,远大于单硬脂酸甘油脂(单甘脂)、蔗糖脂肪酸酯(蔗糖酯)和脂肪醇聚氧乙烯醚(AEO-9)等为稳定剂时形成的乳液;30 g/L的GDHA-g-HPCS(D_(G)为2.81%)水溶液用GP交联后,在37℃下经26 min即可形成凝胶,且该凝胶具有温敏性,将其置于4.0℃的环境中经42 min又重新转化为溶胶。
Glycidyl dehydroabietate grafted hydroxypropyl chitosan(GDHA-g-HPCS)was obtained through the grafting reaction between hydroxypropyl chitosan(HPCS)and glycidyl dehydroabietate(GDHA),and the GDHA-g-HPCS was cross-linked with sodium glycerophosphate as cross-linking agent.The structures of intermediates and products were characterized by FT-IR,^(1)H NMR and UV.The degree of substitution(D_(S))of HPCS and the grafting degree(D_(G))of the GDHA-g-HPCS were determined by elemental analysis.The surface activities of GDHA-g-HPCSs were investigated by surface tension method.The emulsifying abilities of GDHA-g-HPCSs were evaluated according to the stabilization time of emulsion composed of benzene and water with GDHA-g-HPCS as emulsifier.The gel formation time of cross-linked GDHA-g-HPCS was studied by inverted bottle method.When the D_(S) of HPCS was 110.6%and the D_(G) increased from 0.72%to 10.54%,the results showed the critical micelle concentration of GDHA-g-HPCSs decreased from 761.9 mg/L to 189.4 mg/L while the minimum surface tension(γ_(min))was maintained about 45 mN/m,and the emulsifying ability of GDHA-g-HPCS increased at first and then decreased with the increase of D_(G).When the 2 g/L GDHA-g-HPCS with the D_(G) of 2.81%was utilized as emulsifier,the stabilization time of benzene-water emulsion was 18063 s much better than that of the emulsion formed by stabilizer,such as monoglyceride,sucrose ester or AEO-9.When the 30 g/L aqueous solution of GDHA-g-HPCS cross-linked by GP,a gel could be formed in 26 minutes at 37℃,and could be converted into a sol again in 42 minutes at 4℃.
作者
杨欣欣
郭伟
蔡照胜
黄旭娟
王婷
丁正青
YANG Xinxin;GUO Wei;CAI Zhaosheng;HUANG Xujuan;WANG Ting;DING Zhengqing(School of Chemistry and Chemical Engineering,Yancheng Institute of Technology,Yancheng 224051,China;Institute of Chemical Industry of Forest Products,CAF,Nanjing 210042,China;School of Chemistry and Chemical Engineering,Jiangsu University,Zhenjiang 212000,China)
出处
《林产化学与工业》
CAS
CSCD
北大核心
2021年第6期51-56,共6页
Chemistry and Industry of Forest Products
基金
国家自然科学基金资助项目(32071706)
江苏省生物质能源与材料重点实验室开放基金项目(JSBEM201909)。
关键词
羟丙基壳聚糖
表面活性
乳化性能
温敏凝胶
hydroxypropyl chitosan
surface activity
emulsifying property
temperature-sensitive gel
