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Using PVP/SDS Complex as a Probe to Study the Inclusion Complex of β-cyclodextrin with SDS in Aqueous Solution
Xiao-ming Chen,Hai-yang Yang*,Ping-sheng He
Author NameAffiliationE-mail
Xiao-ming Chen Department of Polymer Science and Engineering,University of Science and Technology of China,Hefei 230026, China  
Hai-yang Yang* Department of Polymer Science and Engineering,University of Science and Technology of China,Hefei 230026, China yhy@ustc.edu.cn 
Ping-sheng He Department of Polymer Science and Engineering,University of Science and Technology of China,Hefei 230026, China  
Abstract:
PVP/SDS complex was applied as a probe to study the interaction between β-cyclodextrin (β-CD) and sodium dodecyl sulfate (SDS) in aqueous solution. It has been found that a critical concentration, namely cs, exists in the relative viscosity of solution containingPVP/SDS complex versus β-CD concentration plot. As the β-CD concentration is lessthan cs, the relative viscosity of solution decreases sharply by adding β-CD into solution successively. On the other hand, as the β-CD concentration is greater than cs, the relative viscosity of solution increases gradually by adding β-CD into solution. The decrease of the relative viscosity of solution containing PVP/SDS in the presence of β-CD is just due to the inclusion complex of β-CD with the guest molecule SDS. And, this inclusion interaction takes down SDS from the PVP chains in solution. The ratio of the host molecule β-CD to the guest molecule SDS can be calculated from cs. In our experiment the inclusion ratio of β-CD to SDS is 1/1. The further experimental results indicate that cs is associated with SDS but free from PVP in PVP/SDS complex. However, the inclusion ratio of β-CD to SDS has proved to be independent of either SDS or PVP in PVP/SDS complex.
Key words:  PVP/SDS complex, β-cyclodextrin, Relative viscosity, Inclusion ratio
FundProject:
Using PVP/SDS Complex as a Probe to Study the Inclusion Complex of β-cyclodextrin with SDS in Aqueous Solution
陈晓明,杨海洋*,何平笙
摘要:
利用PVP/SDS聚集体作为探针研究了水溶液中β-环糊精与SDS之间的包合作用,结果表明在含有PVP/SDS聚集体溶液的相对粘度对β-环糊精浓度作图中存在着特征浓度cs,当β-环糊精的浓度低于cs时,随着β-环糊精浓度的增加,溶液的相对粘度迅速下降;与此相反,当β-环糊精浓度高于cs时,随着β-环糊精浓度的增加,溶液的相对粘度逐渐增加. 含有PVP/SDS聚集体溶液相对粘度随着β-环糊精浓度增加而迅速下降是由于β-环糊精包合了客体分子SDS,该包合作用将导致SDS分子从高分子链中脱落. β-环糊精和SDS包合比例可以由cs计算得出,实验结果是1比1. 进一步的实验结果表明,cs与PVP/SDS聚集体中SDS的含量有关、和PVP的含量无关,但是β-环糊精和SDS的包合比与PVP/SDS聚集体中SDS和PVP的含量皆无关.
关键词:  PVP/SDS聚集体,β-环糊精,相对粘度,包合比
DOI:10.1088/1674-0068/22/05/541-544
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