Highly Efficient Adsorption of Phenylethanoid Glycosides on Mesoporous Carbon.

Helin Xu,Jinli Zhang,Wenjing Pei,Xueqin Li

doi:10.3389/fchem.2019.00781

Abstract

PhGs are the major active compounds of Cistanche tubulosa, and it is extremely desirable for obtaining high purification of PhGs by adsorption from their extracts. To explore highly efficient adsorption of PhGs, a novel adsorption material for the efficient separation and purification of phenylethanoid glycosides (PhGs) from Cistanche tubulosa was explored. The three mesoporous carbons of ordered mesoporous carbon (CMK-3), disordered mesoporous carbon (DMC), and three-dimensional cubic mesoporous carbon (CMK-8) were compared for adsorption of PhGs. Meanwhile, adsorption isotherms, adsorption kinetics, and the optimization of adsorption conditions were investigated. The results indicated that CMK-3 showed the highest adsorption capacity of 358.09 ± 4.13 mg/g due to its high specific surface area, large pore volume and oxygen-containing functional groups. The experimental data can be accurately described using the Langmuir model and pseudo-second-order model. The intra-particle diffusion model suggested that the rate-limiting steps of adsorption were intra-particle diffusion.

Highlights

Cistanche tubulosa was an Orobanchaceae parasitic plant (Li et al, 2016; Wang X. et al, 2017), and it mainly grown on the roots of Tamarix plants and Calotropis species (Zhang W. et al, 2016; Yan et al, 2017)
The results showed that CMK-3 had a largest specific surface area and pore volume among the three adsorbents (CMK3, disordered mesoporous carbon (DMC), and CMK-8), and it can adsorb phenylethanoid glycosides (PhGs) molecules more effective than DMC and CMK-8 from the extracts of Cistanche tubulosa
Because the oxygen-containing functional groups on the surface of CMK-3 can provide a large number of active adsorption sites for the PhGs molecules

Summary

Introduction

Cistanche tubulosa was an Orobanchaceae parasitic plant (Li et al, 2016; Wang X. et al, 2017), and it mainly grown on the roots of Tamarix plants and Calotropis species (Zhang W. et al, 2016; Yan et al, 2017). Cistanche tubulosa was originally recorded in Shen Nong’s Chinese Materia Medica in ca. Cistanche tubulosa was a precious Chinese tonic herb which had the functions of nourish the kidney, anti-aging, boosts the essence of blood, and moistens the large intestines to free stool (Gu et al, 2016; Shimada et al, 2017; Cui et al, 2018), and it has been reputation as “Ginseng of the Deserts” (Song et al, 2016; Wang et al, 2018). The structures of PhGs were mainly composed of cinnamic acid and phenylethyl alcohol that were attached to a β-glucopyranose through ester and glycosidic linkages (Luo et al, 2010), and PhGs have been regarded as the major active

Methods

Results

Conclusion