Adsorption separation of terpene lactones fromGinkgo biloba L. extract using glass fiber membranes modified with octadecyltrichlorosilane

Abstract

In this study porous glass fiber membranes were modified by reaction with octadecyl-trichlorosilane to form C18 hydrophobic membranes. The contact angle and the CH2 vibration bands at 2855 and 2920 cm(-1) found by FTIR measurements verified the successful immobilization of C18 groups on the glass fiber membranes. The resulting C18 hydrophobic membranes were used to adsorb terpene lactones from crude Ginkgo biloba L. extracts. In batch adsorption processes, the modified C18 membranes exhibited a better adsorption performance than commercial C18 solid phase extraction adsorbents. Different desorption solvents were tested and ethyl acetate was found to preferentially desorb terpene lactones from the modified C18 membranes. In flow adsorption experiments at 1 mL/min, terpene lactone contents higher than 6 wt% (the standardized content) could be achieved in the elution step using ethyl acetate.

Nanocoating on alkali-resistant glass fibers by octadecyltrichlorosilane to improve the mechanical strength of fibers and fibers/epoxy composites

“…22,[25][26][27]29 Figure 5 shows the FTIR result of ARG and OTS-treated ARG, the untreated ARG having a characteristic Si-O-Si band at 889 cm À1 and the Si-O group vibrations appearing at $675 cm À1 . 17 The main bands formed due to OTS treatment are at $2844 and $2915 cm À1 for the terminal methyl (CH 3 and CH 2 ) group with different intensities. 19,25,27 Mechanical property Figure 6 and Table 1 present the tensile property results of ARG, ARG/epoxy and epoxy samples.…”

“…13 After the OTS monolayer deposition, the water contact angle was higher in comparison to untreated ARG (insert image in Figure 3b). According to the literature, the OTS created very hydrophobized surfaces with contact angles between 140 and 150 o , such as on wood, 25 wood fibers, 26 glass fiber membranes, 17 polyvinyl alcohol (PVA)/ SiO 2 nanofibrous membranes 27 and fiberglass cloths. 18…”

“…Su et al. 17 prepared the porous glass fiber membranes and modified them with OTS surfactant to form the C18 hydrophobic membranes. The membrane was used to absorb separation of terpene lactones from Ginkgo biloba L. extract.…”

“…Sauer and Carney 16 investigated the wetting properties of glass fibers via dynamic contact angle measurement treated with silane (octadecyltrichlorosilane (OTS)) and fluorocarbon monolayers. Su et al 17 prepared the porous glass fiber membranes and modified them with OTS surfactant to form the C18 hydrophobic membranes. The membrane was used to absorb separation of terpene lactones from Ginkgo biloba L. extract.…”

Isolation and enrichment of Ginkgo biloba extract by a continuous chromatography system

“…In recent years, a variety of methods have been reported for the isolation and enrichment of GBE [11][12][13][14][15][16]. The most typical method is traditional resin technology, which plays an irreplaceable role in the isolation and enrichment of natural product [17][18][19] due to good selectivity, fast adsorption speed, and easy regeneration process.…”