Adsorption characteristics of rebaudioside A and stevioside on cross-linked poly(styrene-co-divinylbenzene) macroporous resins functionalized with chloromethyl, amino and phenylboronic acid groups.
The adsorptive separation of each steviol glycoside from aqueous solutions by polymeric adsorbents has attracted a lot of interest in recent years. The adsorption properties of chloromethylated cross-linked poly(styrene-co-divinylbenzene) macroporous resins, functionalised with chloromethyl, amino and phenylboronic acid groups, towards rebaudioside A and stevioside were studied. The results revealed that the resins with amino and phenylboronic acid groups preferred to adsorb stevioside rather than rebaudioside A, and their adsorption kinetics fitted a pseudo-second-order model. Isothermal equilibrium curves of rebaudioside A and stevioside showed a good fitness with the Langmuir and Freundlich models. The adsorption of rebaudioside A and stevioside onto resins was a spontaneous and exothermic process as indicated by the negative values in free energy and enthalpy. Results from the resin-packed column demonstrated that an effluent rich in rebaudioside A (purity 98%) was obtained prior to the breakthrough point of stevioside.
College of Food Science, Southwest University, Chongqing 400715, China.
Fayin
F
Ye
School of Food Science and Technology, Jiangnan University, Wuxi 214122, China. Electronic address: yrj@jiangnan.edu.cn.
Ruijin
R
Yang
School of Food Science and Technology, Jiangnan University, Wuxi 214122, China.
Xiao
X
Hua
College of Food Science, Southwest University, Chongqing 400715, China.
Guohua
G
Zhao
D000327:Adsorption; D001897:Boronic Acids / Q000737:chemistry; D045786:Diterpenes, Kaurane / Q000737:chemistry*; D005960:Glucosides / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D011137:Polystyrenes / Q000737:chemistry*; D013549:Sweetening Agents / Q000737:chemistry*
D001897:Boronic Acids; D045786:Diterpenes, Kaurane; D005960:Glucosides; D011137:Polystyrenes; D013549:Sweetening Agents; C432006:divinylbenzene-polystyrene copolymer; C012043:stevioside; C025474:rebaudioside A; C010686:benzeneboronic acid
Adsorption kinetics; Macroporous resins; Rebaudioside A; Stevioside