title: MoS2/Ag nanohybrid: A novel matrix with synergistic effect for small molecule drugs analysis by negative-ion matrix-assisted laser desorption/ionization time-of-flight mass spectrometry.
abstract: This paper reports a facile synthesis of molybdenum disulfide nanosheets/silver nanoparticles (MoS2/Ag) hybrid and its use as an effective matrix in negative ion matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS). The nanohybrid exerts a strong synergistic effect, leading to high performance detection of small molecule analytes including amino acids, peptides, fatty acids and drugs. The enhancement of laser desorption/ionization (LDI) efficiency is largely attributed to the high surface roughness and large surface area for analyte adsorption, better dispersibility, increased thermal conductivity and enhanced UV energy absorption as compared to pure MoS2. Moreover, both Ag nanoparticles and the edge of the MoS2 layers function as deprotonation sites for proton capture, facilitating the charging process in negative ion mode and promoting formation of negative ions. As a result, the MoS2/Ag nanohybrid proves to be a highly attractive matrix in MALDI-TOF MS, with desired features such as high desorption/ionization efficiency, low fragmentation interference, high salt tolerance, and no sweet-spots for mass signal. These characteristic properties allowed for simultaneous analysis of eight different drugs and quantification of acetylsalicylic acid in the spiked human serum. This work demonstrates for the first time the fabrication and application of a novel MoS2/Ag hybrid, and provides a new platform for use in the rapid and high throughput analysis of small molecules by mass spectrometry.
authors: State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, PR China. Electronic address: daisy19900911@hotmail.com.
authors: Yaju
authors: Y
authors: Zhao
authors: Department of Polymer Science and Engineering, Nanjing University, Nanjing, 210023, PR China. Electronic address: denggqq@sina.com.
authors: Guoqing
authors: G
authors: Deng
authors: State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, PR China. Electronic address: lcswyh@126.com.
authors: Xiaohui
authors: X
authors: Liu
authors: State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, PR China. Electronic address: sunliang@nju.edu.cn.
authors: Liang
authors: L
authors: Sun
authors: State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, PR China. Electronic address: lihui@nju.edu.cn.
authors: Hui
authors: H
authors: Li
authors: Department of Chemistry, University of California, Riverside, CA, 92521, United States. Electronic address: quan.cheng@ucr.edu.
authors: Quan
authors: Q
authors: Cheng
authors: Department of Polymer Science and Engineering, Nanjing University, Nanjing, 210023, PR China. Electronic address: xikai@nju.edu.cn.
authors: Kai
authors: K
authors: Xi
authors: State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, PR China. Electronic address: xudanke@nju.edu.cn.
authors: Danke
authors: D
authors: Xu
mesh_terms: D000658:Amoxicillin / Q000032:analysis*; D000667:Ampicillin / Q000032:analysis*; D001241:Aspirin / Q000097:blood; D004220:Disulfides / Q000138:chemical synthesis / Q000737:chemistry; D006801:Humans; D008982:Molybdenum / Q000737:chemistry; D053758:Nanoparticles / Q000737:chemistry*; D010316:Particle Size; D012834:Silver / Q000737:chemistry; D054852:Small Molecule Libraries / Q000032:analysis*; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization; D013418:Sulfamethazine / Q000032:analysis*; D013420:Sulfamethoxazole / Q000032:analysis*
chemical_list: D004220:Disulfides; D054852:Small Molecule Libraries; D012834:Silver; D013418:Sulfamethazine; D000667:Ampicillin; D000658:Amoxicillin; D008982:Molybdenum; D013420:Sulfamethoxazole; D001241:Aspirin; C082964:molybdenum disulfide
keywords: Matrix; Matrix-assisted laser desorption/ionization time-of-flight mass spectrometry; MoS(2)/Ag; Small molecule drugs; Synergistic effect