用高效阴离子交换色谱-脉冲安培检测法(HPAEC-PAD)测定了烤烟中的水溶性葡萄糖、果糖和蔗糖。采用水浸取及膜过滤法处理烤烟样品,以D ionex C arboPac PA-1阴离子交换柱为色谱柱,0.2m o l/L N aOH水溶液为淋洗液进行分离测定。葡萄糖、...用高效阴离子交换色谱-脉冲安培检测法(HPAEC-PAD)测定了烤烟中的水溶性葡萄糖、果糖和蔗糖。采用水浸取及膜过滤法处理烤烟样品,以D ionex C arboPac PA-1阴离子交换柱为色谱柱,0.2m o l/L N aOH水溶液为淋洗液进行分离测定。葡萄糖、果糖和蔗糖的含量与其峰面积的线性关系良好,回收率均在97%以上。方法简便易行,灵敏度高,重现性良好,可以实现对烟草中单糖的快速分离和测定。展开更多
The reactions of 18-crown-6with Na 2M(SCN)4(M=Pd,Pt )were studied and the complexNa (18-C-62 (H2O) nPd(SCN)4 n and complex2Na (18-C-6) 2 (H 2 O nPt (SCN) 4 n were characterized by ele-mental analysis,IR and X-ray diff...The reactions of 18-crown-6with Na 2M(SCN)4(M=Pd,Pt )were studied and the complexNa (18-C-62 (H2O) nPd(SCN)4 n and complex2Na (18-C-6) 2 (H 2 O nPt (SCN) 4 n were characterized by ele-mental analysis,IR and X-ray diffra ction analysis.The complexes belon g to monoclinic,space group P2 1 /n with cell dimensions,1:a=1.05734(7),b=1.42250(10),c=1.47762(10)nm,β=107.5330(10)°,V=2.1192(2)nm 3 ,Z =2,D calcd =1.460g·cm -3 ,F(000)=964,R 1 =0.0406,w R 2 =0.1264and2:a=1.05985(19),b=1.4237(3),c=1.4744(3)nm,β=107.096(3)°,V=2.1264(7)nm 3 ,Z =2,D calcd =1.690g·cm -3 ,F(000)=1028,R 1 =0.0292,w R 2 =0.0859.In the solid state,the comp lexes1and2show an one-dimensnal chain ofNa (18-C-6)狚 2 (H 2O)2+ complex cations andM(SCN) 4 2- (M=Pd,Pt )complex anions bridged by Na-N in-teractions.展开更多
A new method for determination of 3-MCPD in powder condiments was established by GC-MS method using 1,4-butanediol as an internal standard.Samples were ultrasonically extracted by ethyl acetate,and cleaned up by dispe...A new method for determination of 3-MCPD in powder condiments was established by GC-MS method using 1,4-butanediol as an internal standard.Samples were ultrasonically extracted by ethyl acetate,and cleaned up by dispersive solid-phase extraction(d-SPE) using octadecane sorbent(C18).Then the extract was derivatized with HFBI and detected by GC-MS.The detection limitation was 1.0 μg/kg,and spiked recoveries ranged from 97%-102% with RSD of 2.1%-4.1%.展开更多
文摘用高效阴离子交换色谱-脉冲安培检测法(HPAEC-PAD)测定了烤烟中的水溶性葡萄糖、果糖和蔗糖。采用水浸取及膜过滤法处理烤烟样品,以D ionex C arboPac PA-1阴离子交换柱为色谱柱,0.2m o l/L N aOH水溶液为淋洗液进行分离测定。葡萄糖、果糖和蔗糖的含量与其峰面积的线性关系良好,回收率均在97%以上。方法简便易行,灵敏度高,重现性良好,可以实现对烟草中单糖的快速分离和测定。
文摘The reactions of 18-crown-6with Na 2M(SCN)4(M=Pd,Pt )were studied and the complexNa (18-C-62 (H2O) nPd(SCN)4 n and complex2Na (18-C-6) 2 (H 2 O nPt (SCN) 4 n were characterized by ele-mental analysis,IR and X-ray diffra ction analysis.The complexes belon g to monoclinic,space group P2 1 /n with cell dimensions,1:a=1.05734(7),b=1.42250(10),c=1.47762(10)nm,β=107.5330(10)°,V=2.1192(2)nm 3 ,Z =2,D calcd =1.460g·cm -3 ,F(000)=964,R 1 =0.0406,w R 2 =0.1264and2:a=1.05985(19),b=1.4237(3),c=1.4744(3)nm,β=107.096(3)°,V=2.1264(7)nm 3 ,Z =2,D calcd =1.690g·cm -3 ,F(000)=1028,R 1 =0.0292,w R 2 =0.0859.In the solid state,the comp lexes1and2show an one-dimensnal chain ofNa (18-C-6)狚 2 (H 2O)2+ complex cations andM(SCN) 4 2- (M=Pd,Pt )complex anions bridged by Na-N in-teractions.
文摘A new method for determination of 3-MCPD in powder condiments was established by GC-MS method using 1,4-butanediol as an internal standard.Samples were ultrasonically extracted by ethyl acetate,and cleaned up by dispersive solid-phase extraction(d-SPE) using octadecane sorbent(C18).Then the extract was derivatized with HFBI and detected by GC-MS.The detection limitation was 1.0 μg/kg,and spiked recoveries ranged from 97%-102% with RSD of 2.1%-4.1%.
