1.Synthesis and Characterization of Methylsulfonium Salt in Diesel Fraction Using Electrospray Ionization Fourier Transform Ion Cyclotron Resonance Mass Spectrometry
Na PAN ; Quan SHI ; Chunming XU ; Peng LIU ; Yahe ZHANG ; Junhui HE ; Suoqi ZHAO
Chinese Journal of Analytical Chemistry 2010;38(3):413-416
Sulfur compounds in the diesel were selectively derived into methylsulfonium salts by reacting with iodomethane in the presence of silver tetrafluoroborate, and characterized by positive-ion electrospray ionization (ESI) fourier transform ion cyclotron resonance (FT-ICR MS). The conversion ratios and react selectivities of the methylation for various sulfur compounds were investigated by gas chromatograph coupled with pulse flame photometric detector (GC-PFPD). Result shows that the sulfur compounds in the diesel can react with iodomethane easily at room temperature, the most of sulfur compound derived into methylsulfonium salts;the homologue of benzothiophene get the higher conversion ratio and react selectivity than the homologue of dibenzothiophene (DBT). It is found that primarily sterically hindered alkylated DBT, for example, 4- or 4-, 6- DBT, is recalcitrant to be methylated. Other than benzothiophenes and dibenzothiophenes, one- and two-ring sulfides, as well as other sulfur compounds with a double bond equivalent (DBE) value ranged from 1 to 12 are identified in the diesel.
2.Correlation of DAT-positive hemolytic anemia with gender, age and ABO serological indicators
Junhui QUAN ; Xiang SHAO ; Minggang ZHANG
Chinese Journal of Blood Transfusion 2021;34(8):847-850
【Objective】 To explore the correlation of DAT-positive hemolytic anemia(HA) with gender, age, and ABO serological indicators (anti-A, anti-B, anti-AB, anti-D; Ac, Bc, Oc), so as to provide references for clinical diagnosis. 【Methods】 2 832 HA patients who had underwent DAT tests in the Second Affiliated Hospital of Xi′an Jiaotong University in recent years were divided into the positive-DAT patients ( n=382 )and negative-DAT patients (n=2 450 ) according to the testing results. The correlation between the positive-DAT patients and the sex, age and ABO serological indicators was analyzed using SPSS 25.0 statistical software. 【Results】 DAT-positive HA risk in women were significantly higher than men (OR=1.712, CI