期刊：
European Food Research and Technology,2021年247(8):1975-1985 ISSN：1438-2377
通讯作者：
Zhang, X.-H.;Qing, X.-D.
作者机构：
[Zhang, Xiao-Hua; Wang, Deguo; Zhang, Ai-Li; Liu, Xue-Jiao; Xiao, Fu-Gang; Guo, Wei-Yun] Xuchang Univ, Henan Key Lab Biomarker Based Rapid Detect Techno, Food & Pharm Coll, Xuchang 461000, Peoples R China.;[Qing, Xiang-Dong] Hunan City Univ, Coll Mat & Chem Engn, Hunan Prov Key Lab Dark Tea & Jin Hua, Yiyang 413049, Peoples R China.;[Liu, Yanhong] ARS, Mol Characterizat Foodborne Pathogens Res Unit, Eastern Reg Res Ctr, USDA, Wyndmoor, PA 19038 USA.
通讯机构：
[Zhang, X.-H.; Qing, X.-D.] H;Henan Key Laboratory of Biomarker Based Rapid-Detection Technology for Food Safety, Food and Pharmacy College, Xuchang University, Xuchang, People’s Republic of China
摘要：
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
摘要：
For the first time, alternating trilinear decomposition-assisted multivariate curve resolution (ATLD-MCR) was applied to analyse complex gas chromatography-mass spectrometric (GC-MS) data with severe baseline drifts, serious co-elution peaks and slight retention time shifts for the simultaneous identification and quantification of polycyclic aromatic hydrocarbons (PAHs) in aerosols. It was also compared with the classic multivariate curve resolution-alternating least-squares (MCR-ALS) and the GC-MS-based external standard method. In validation samples, average recoveries of five PAHs were within the range from (96.2 +/- 6.8)% to (106.5 +/- 4.1)% for ATLD-MCR, near to the results of MCR-ALS ((98.0 +/- 1.5)% to (106.7 +/- 4.3)%). In aerosol samples, the concentrations of pyrene provided by ATLD-MCR were not significantly different from those of MCR-ALS. The other four PAHs including chrysene, benzo[a]anthracene, fluoranthene and benzo[b]fluoranthene were not detected by ATLD-MCR and the GC-MS-based external standard method. The results of figures of merit further demonstrated that ATLD-MCR achieved high sensitivities (8.9 x 10(4) to 1.7 x 10(6) mAU ml mu g(-1)) and low limits of detection (0.003 to 0.087 mu g ml(-1)), which were better than or similar to MCR-ALS, presenting a great choice to deal with complex GC-MS data for the simultaneous determination of targeted PAHs in aerosols.
期刊：
JOURNAL OF ORGANIC CHEMISTRY,2021年86(21):15658-15664 ISSN：0022-3263
通讯作者：
Chen, Shanping;Deng, Guo-Jun
作者机构：
[Fang, Fang; Jiang, Shuxin; Chen, Shanping; Deng, Guo-Jun; Chen, SP; Deng, GJ; Lei, Hanwen] Xiangtan Univ, Coll Chem, Minist Educ,Key Lab Green Organ Synth & Applicat, Key Lab Environm Friendly Chem & Applicat, Xiangtan 411105, Peoples R China.;[Fang, Fang] Hunan City Univ, Coll Mat & Chem Engn, Yiyang 413000, Peoples R China.
通讯机构：
[Chen, SP; Deng, GJ] X;Xiangtan Univ, Coll Chem, Minist Educ,Key Lab Green Organ Synth & Applicat, Key Lab Environm Friendly Chem & Applicat, Xiangtan 411105, Peoples R China.
摘要：
A convenient and efficient strategy for the synthesis of dibenzoxazepinamines and dibenzothiazepinamines has been developed. This three-component approach started from 2-nitrobenzaldehydes, 2-aminophenols, and methoxyammonium chlorides under metal-free conditions. The protocol has the advantages of readily available starting materials, simple and facile conditions, gram-scale synthesis, and broad substrate scope, providing an efficient and practical strategy for the preparation of potential drug-active dibenzoxazepinamines and dibenzothiazepinamines in one pot.
摘要：
Abstract: In this study, ramie fiber is used as raw materials and modified by sodium hydroxide with different mass concentration. It was found that the surface of modified ramie fiber became rough and had a lot of pore structure, and the number of hydroxyl groups on the surface of ramie fiber decreased and the hydrophobicity and lipophilicity of ramie fiber increased, which is beneficial to improve oil absorption. Oil absorbency and oil retention of ramie modified by NaOH solution with different concentrations for peanut oil adsorption were studied. It was found that ramie fiber modified by 8 wt% NaOH solution has the best adsorption effect, and by 8 wt% NaOH solution the best oil retention.#@#@#摘要: 本文采用苎麻纤维为原料，配制不同质量浓度的氢氧化钠对其改性。对改性前后苎麻纤维的化学结构和微观形貌进行了表征，发现苎麻纤维表面羟基变少，疏水亲油性能增强，改性后苎麻纤维表面变得粗糙，孔结构增多，有利于吸油。论文考察其对花生油的吸油效果和保油性能，研究发现8%的氢氧化钠溶液改性后的苎麻纤维的吸附效果最好，4%的氢氧化钠溶液改性后的苎麻纤维的保油效果最好。
作者机构：
[杨泛明; 黎丽君; 肖浪; 廖敏; 张可意; 贺国文] College of Materials and Chemical Engineering, Hunan City University, Yiyang;413000, China;[谭伟石] All-Solid-State Energy Storage Materials and Devices Key Laboratory of Hunan Province, Hunan City University, Yiyang;[杨泛明; 黎丽君; 肖浪; 廖敏; 张可意; 谭伟石; 贺国文] 413000, China
通讯机构：
[He, G.-W.] C;College of Materials and Chemical Engineering, China
期刊：
Materials Research Express,2021年8(5):055303 ISSN：2053-1591
作者机构：
[Yang, Haiyang; Lang, Feng; Song, Ling; Li, Duxin; Shangguan, Jinfei] Cent South Univ, State Key Lab Powder Met, Changsha 410083, Peoples R China.;[Yang, Haiyang; Song, Ling; Wang, Jin; Shangguan, Jinfei; Jiang, Qibin] Zhuzhou Times New Mat Technol Co Ltd, Zhuzhou 413000, Peoples R China.;[You, Yilan] Hunan City Univ, Coll Mat & Chem Engn, Yiyang 413000, Peoples R China.
关键词：
MC nylon;polydimethylsiloxane;MoS2;friction performance
摘要：
MoS2 reinforced PDMS/MC nylon composites had been fabricated by in situ polymerization to further enhance the comprehensive properties of nylon material. Polydimethylsiloxane was pre-sythesized as the activator of the system and MoS2 was compounded as the wear-resisting agent. The thermal stability, mechanical properties, friction and wear properties of composites with different MoS2 contents were tested. The results showed that the crystallization and thermal stability of nylon matrix were increased with the addition of MoS2, while the tensile strength and impact strength were slightly reduced. The composites finally presented excellent friction properties with 3 wt% MoS2, whose friction coefficient was reduced to 0.75 (18.48% decrease) corresponding to the wear rate of 0.4145 x 10(-8) g Nm(-1).
