Trace amounts of poly‐β‐cyclodextrin wrapped carbon nanotubes for the microextraction of flavonoids in honey samples by capillary electrophoresis with light‐emitting diode induced fluorescence detection

Abstract

A novel dispersive micro-SPE method with trace poly-β-CD wrapped multiwalled carbon nanotubes as sorbents was applied to extract flavonoids in honey samples. The analytes were then determined by CE with LED-induced fluorescence detection. The influencing parameters, such as the sorbent concentration, extraction time, and eluent type, were properly optimized. The established method had the advantages of simplicity, low consumption of sorbent amount (0.009 mg) and organic solvent (100 μL), and high sensitivity, meeting the principle of green chemistry. Under the optimum conditions, the sorbents allowed the extraction and preconcentration of the flavonoids with enrichment factors in the range from 78 to 166. The recovery study performed at two different fortification levels provided an average recovery >91%. LODs for all the compounds ranged from 0.07 to 17.99 ng/mL. These results demonstrated that the proposed method could be used as a convenient and efficient extraction technique for analysis of flavonoids in different honey matrices.

Biopolymer Hydrogel-Based Salt-Resistant Evaporator for Solar-Energy-Driven Desalination and Water Purification

“…It was found that the PCD@CNTs exhibited some typical absorption features of the PCD, such as vibrations of glucose units at 1023 cm –1 (C–O stretching) and 1151 cm –1 (C–O–C stretching). A strong band was seen at 3417 cm –1 (O–H stretching), which confirmed the presence of hydroxyl groups in PCD@CNTs . These results demonstrated that all of the main functional groups in CNTs and PCD were presented in PCD@CNTs.…”

Recent advances in the application of capillary electromigration methods for food analysis and Foodomics

“…Another application of a sample pretreatment method followed by CE analysis was developed by Xu et al. , they used trace amounts of poly‐β‐cyclodextrin wrapped carbon nanotubes (poly‐β‐CD‐MWCNT) for the extraction of flavonoids in honey samples. After this extraction, the analytes were separated and determined by CE with light‐emitting diode induced fluorescence detection (LED‐IF).…”

Modern microextraction techniques for natural products

“…Recently, DMSPE has been widely applied in the extraction and preconcentration of active compounds in natural products due to its unique advantages. Several selected applications involving the use of DMSPE in the analysis of TCMs are shown in Table 4 [93][94][95][96][97][98]. Among them, a schematic procedure for graphite oxide-assisted DMSPE is shown in Fig.…”

“…Relatively low LODs ranged from 0.22 to 16.19 ng/mL, and satisfactory recovery in the range of 89-106% was obtained under the optimum conditions. Xu et al prepared poly-β-cyclodextrin-wrapped carbon nanotubes as an adsorbent in DMSPE for the extraction of flavonoids in honey samples[97]. The poly-β-cyclodextrin-wrapped carbon nanotubes improved the dispersibility of MWCNTs in aqueous solutions and provided high extraction efficiency of the target analytes with enrichment factors in the range of 78-166 due to the existence of van der Waals forces, π-π stacking, hydrophobic, and hydrogen bonding interactions between sorbent and target analytes.…”