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121 results on '"Liu, Saiwen"'

8. An electrochemical sensor based on porous heterojunction hollow NiCo-LDH/Ti3C2Tx MXenes composites for the detection of quercetin in natural plants.

Author

Zhong, Yu, Liao, Ran, He, Guowen, Liu, Saiwen, Zhang, Jin, and Chen, Chao

Subjects
ELECTROCHEMICAL sensors, LAYERED double hydroxides, ELECTRIC conductivity, FOOD chemistry, ION channels
Abstract

Cubic hollow-structured NiCo-LDH was synthesized using a solvothermal method. Subsequently, clay-like Ti3C2Tx MXenes were electrostatically self-assembled with NiCo layered double hydroxides (NiCo-LDH) to form composites featuring three-dimensional porous heterostructures. The composites were characterized using SEM, TEM, XRD, XPS, and FT-IR spectroscopy. Ti3C2Tx MXenes exhibit excellent electrical conductivity and hydrophilicity, providing abundant binding sites for NiCo-LDH, thereby promoting an increase in ion diffusion channels. The formation of three-dimensional porous heterostructural composites enhances charge transport, significantly improving sensor sensitivity and response speed. Consequently, the sensor demonstrates excellent electrochemical detection capability for quercetin (Qu), with a detection range of 0.1–20 µM and a detection limit of 23 nM. Additionally, it has been applied to the detection of Qu in natural plants such as onion, golden cypress, and chrysanthemum. The recovery ranged from 97.6 to 102.28%. [ABSTRACT FROM AUTHOR]

Published
2024
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11. A novel electrochemical sensor for detection of luteolin in food based on 3D networked electrically interconnected SiO2@GO/MXene composite.

Author

Peng, Mei, Chen, Chao, Ouyang, Qiaoling, Liu, Saiwen, Zhang, Jin, and Fei, Junjie

Subjects
ELECTROCHEMICAL sensors, PEANUT hulls, FOOD chemistry, LUTEOLIN, COMPOSITE materials
Abstract

Luteolin (Lu), a compound with various biochemical and pharmacological activities beneficial to human health, has attracted researchers' attention. This study proposes an efficient and scalable method using ultrasound to intercalate graphene oxide (GO)-coated silica spheres (SiO2) into MXenes, resulting in a 3D conductive interconnected structural composite material. Characterization of the composite material was conducted using SEM, TEM, XRD, XPS, and Raman spectroscopy. MXenes exhibit excellent electrical conductivity, and the SiO2@GO surface with abundant hydroxyl and silanol groups provides high-binding active sites that facilitate Lu molecule enrichment. The formation of the 3D conductive interconnected structural composites enhances charge transport, significantly improving sensor sensitivity. Consequently, the sensor demonstrates excellent detection capabilities (detection range 0.03–7000 nM, detection limit 12 pM). Furthermore, the sensor can be applied to quantitative determination of Lu in real samples, including chrysanthemums, Jiaduobao, honeysuckle, purple perilla, and peanut shells, achieving recoveries between 98.2 and 104.7%. [ABSTRACT FROM AUTHOR]

Published
2024
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20. Recent Advances in Sulfur-Containing Heterocycle Formation via Direct C–H Sulfuration with Elemental Sulfur.

Author

Liu, Saiwen, Deng, Guo-Jun, and Huang, Huawen

Subjects
*SULFUR, *SULFURATION, *THIADIAZOLES, *CHEMICAL stability, *THIOPHENES, *THIAZOLES, *HETEROCYCLIC compounds
Abstract

The synthesis of sulfur heterocycles via the construction of C–S bonds has received considerable attention due to their biological value and extensive pharmaceutical application. While diverse sulfurating agents have been developed over the past few decades, in this regard, elemental sulfur, with advantages of low toxicity, odorless nature and chemical stability, has great potential for the construction of diverse sulfur heterocycles through its direct incorporation into the target molecules in a concise way. Direct functionalization of inert C–H bonds can shorten the number of reaction steps and minimize the amount of waste formed. Hence, heteroannulations via direct C–H sulfuration is considered to be an attractive strategy for the synthesis of sulfur heterocycles. In the last few years, a vast array of concise systems have been reported for the synthesis of some valuable sulfur heterocycles such as thiophenes, thienoindoles, thienothiazoles, thiazoles, benzothiazoles, and thiadiazoles through direct C–H sulfuration/annulations with elemental sulfur. These are discussed in detail in this review. 1 Introduction 2 Thiophenes 3 Thienoindoles 4 Thienothiazoles 5 Other Fused Thiophenes 6 Thiazoles 7 Benzothiazoles 8 Thiadiazoles 9 Others 10 Summary and Outlook [ABSTRACT FROM AUTHOR]

Published
2021
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50. Iodine-Catalyzed Regioselective Sulfenylation of Indoles with Sodium Sulfinates.

Author

Xiao, Fuhong, Xie, Hao, Liu, Saiwen, and Deng, Guo ‐ Jun

Subjects
REGIOSELECTIVITY (Chemistry), INDOLE compounds, SODIUM sulfites, IODINE compounds, ANISOLE derivatives, HALOGENS, CHEMICAL reactions
Abstract

An iodine-catalyzed sulfenylation of free indoles with sodium sulfinates is described. The reaction selectively afforded 3-arylthioindoles in good to high yields in anisole under metal-free conditions. Functional groups such as halogens were well tolerated under the optimized reaction conditions. [ABSTRACT FROM AUTHOR]

Published
2014
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