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Herein, a novel carboxyl-functionalized porous organic polymer (COOH-POP) was prepared as sorbent. Due to multiple hydrogen bonds and π-π interactions between COOH-POP and phenols, COOH-POP shows good enrichment ability and very fast adsorption rate for phenols. Then, an analytical method was developed for determination of five phenols (2-chlorophenol, bisphenol A, 2,6-dichlorophenol, 2,4-dichlorophenol and p-tert-butylphenol) in bottled water, lemon juice, peach juice and honey samples using COOH-POP as solid phase extraction sorbent in combination with high performance liquid chromatography. Under optimal conditions, the COOH-POP based method gave the detection limits (S/N = 3) of 0.02-0.10 ng mL -1 for bottled water, 0.03-0.12 ng mL -1 for lemon juice, 0.03-0.25 ng mL -1 for peach juice and 0.7-1.5 ng g -1 for honey samples. The recoveries for spiked samples ranged from 84.0 % to 119.0 % with relative standard deviation less than 7.6 %. This study provides a new yet effective method for enrichment of phenols by designing carboxyl-functionalized porous organic polymer as sorbent., Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2023. Published by Elsevier B.V.)

In this work, a novel knitting aromatic polymer (KAP) was fabricated for the first time by knitting ferrocene with 1,3,5-tris(bromomethyl)-2,4,6-trimethylbenzene via Friedel-Crafts reaction, and then the KAP was magnetically functionalized with Fe 3 O 4 nanoparticles to produce a magnetic KAP (M-KAP). Combining M-KAP based magnetic solid-phase extraction with high performance liquid chromatography-ultraviolet detection, a simple and sensitive method was developed for simultaneous determination of six benzoylurea insecticides (BUs) in honey and apple juice samples. In the optimized conditions, a good linearity for the BUs existed in the range of 1.67-1000 ng g -1 for honey sample and 0.500-100.0 ng mL -1 for apple juice sample. The limits of detection were 0.500-1.50 ng g -1 and 0.150-0.400 ng mL -1 for honey and apple juice sample, respectively. Satisfactory recoveries were in the range of 85.5-105.5% with RSDs ≤ 8.3%. The developed method demonstrated an excellent practicability for sensitive analysis of the BUs., (Copyright © 2022 Elsevier Ltd. All rights reserved.)

Design and fabrication of functionalized hypercrosslinked polymers (HCPs) for enhancing their performance by using green renewable monomers has attracted considerable research interest. In this study, hydroxyl‑functional HCP (labeled as OHHCP) was prepared via the knitting method by applying natural naringenin as a monomer for the first time. Due to the good hydrophilicity and strong H-bonding ability, the OHHCP showed high extraction capacity for nitroimidazoles. Thus, it was successfully applied as a potent adsorbent for solid phase extraction of five nitroimidazoles in water, honey and chicken meat, followed by high-performance liquid chromatography-diode array detector analysis. At the optimized conditions, the limit of detections (S/N = 3) of the proposed method for water, honey and chicken samples were 0.02 - 0.06 ng mL -1 , 0.5 - 1.0 ng g - 1 and 0.8 - 1.0 ng g - 1 , respectively. The recoveries were 80.0 - 110%, and the relative standard deviations were below 10.0%. The OHHCP also displayed good application prospects for other organic compounds with H-bonding capability. This study highlights the facile preparation of OH-functionalized HCPs from renewable and natural resources as potent adsorbents for polar compounds., Competing Interests: Declaration of competing interest The authors declare no conflict of interest. The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2022 Elsevier B.V. All rights reserved.)

The preparation of tyrosine-functional novel hypercrosslinked polymer (HCP@Tyr) was achieved by knitting 1,3,5-triphenylbenzene with l-tyrosine via simple Friedel-Crafts reaction. The HCP@Tyr displayed large surface area (1220 m 2 g -1 ) and high adsorption capacity (30 mg g -1 ) for nitroimidazoles (NDZs). With HCP@Tyr as potent sorbent, an efficient extraction method was developed to simultaneously extract five NDZs from honey and chicken muscle samples before high performance liquid chromatography-diode array detection. Under optimized conditions, the proposed method provided a good linearity in the range of 0.75-200.0 ng g -1 for honey and 1.5-100.0 ng g -1 for chicken muscle sample. Low detection limits (S/N = 3) were obtained to be 0.10-0.24 ng g -1 for honey and 0.15-0.30 ng g -1 for chicken muscle. The method recovery was 80.7-120% with relative standard deviations below 9.2%. The HCP@Tyr based method can serve as a reliable and sensitive tool for detection of NDZs in honey and chicken muscle samples., (Copyright © 2022 Elsevier Ltd. All rights reserved.)

In this study, a novel nitrogen-rich magnetic hypercrosslinked polymer (Fe 3 O 4 @Ph-HCP) was fabricated via a facile one-pot reaction of 1,3,5-triphenylbenzene, 2,4-dichloropyrimidine and phenyl-functionalized magnetic Fe 3 O 4 nanoparticles. The Fe 3 O 4 @Ph-HCP possessed high specific surface, abundant nanopores and good stability. Especially, Fe 3 O 4 @Ph-HCP exhibited excellent adsorption capability with fast adsorption rate to neonicotinoid insecticides. It was applied as a superior magnetic adsorbent for rapid enrichment and isolation of four neonicotinoid insecticides (thiamethoxam, imidacloprid, acetamiprid and thiacloprid) from honey, tomato, lettuce and Chinese cabbage samples prior to high performance liquid chromatography-diode array detection. Under the optimized conditions, the good linearity was obtained in the range of 1-1000 ng g -1 for honey, tomato, lettuce and Chinese cabbage samples, and the detection limits (S/N = 3) were 0.30-0.67 ng g -1 for honey, 1-1.5 ng g -1 for tomato, lettuce and Chinese cabbage. The spiked recoveries were 80.1-111%, and relative standard deviations were less than 10.0%. These results demonstrate that the developed method can be used as a good alternative method for sensitive determination of neonicotinoid insecticides in complex samples., Competing Interests: Declaration of Competing Interest The authors declare no conflict of interest. The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2022. Published by Elsevier B.V.)

Natural rutin with abundant hydroxyl groups was used as a green monomer to synthesize hydroxyl-functional magnetic porous organic polymer (named Rut-MOP) through environmentally-benign diazo-coupling reaction for the first time. The Rut-MOP displayed high extraction capability for neonicotinoid insecticides (thiamethoxam, imidacloprid, acetamiprid and thiacloprid). Thus, a Rut-MOP based magnetic solid-phase extraction method combined with high performance liquid chromatography was established for sensitive determination of neonicotinoid insecticides in lemon juice and honey samples. Under optimized conditions, the linear response of neonicotinoids was 0.1-100.0 ng mL -1 for lemon juice and 8.0-1000.0 ng g -1 for honey. The limits of detection (S/N = 3) were 0.03-0.04 ng mL -1 and 2.5-3.0 ng g -1 for lemon juice and honey, respectively. The method recoveries were 82-118% with the relative standard deviations of 1.9-7.6%. The results demonstrate that the Rut-MOP based method can be served as a good alternative for the sensitive analysis of neonicotinoid insecticides in lemon juice and honey., (Copyright © 2022 Elsevier Ltd. All rights reserved.)