The CI-TOFMS of ketoprofen (KP), β-cyclodextrin (CD) and their inclusion complex (KP-CD) have been reported. There are no [M+H]^+ peaks of both KP-CD and CD in their spectra due to the samples involatile and thermal ...The CI-TOFMS of ketoprofen (KP), β-cyclodextrin (CD) and their inclusion complex (KP-CD) have been reported. There are no [M+H]^+ peaks of both KP-CD and CD in their spectra due to the samples involatile and thermal instable. A base peak at m/z 255 in the spectra of both KP and KP-CD was found, which can be assigned to [M+H]^+of KP or inclusive KP (KPi). Three fragment ions a, b and c were formed in the spectra of both KP and KPi with different abundances for the same ions. All the fragment ions of CD and inclusive CD (CDi) have been assigned.展开更多
采用液液萃取(liquid-liquid extraction,LLE)和顶空固相微萃取(headspace solid-phase microextraction,HS-SPME)结合全二维气相色谱-飞行时间质谱(comprehensive two-dimensional gas chromatography/time-of-flight mass spectrometr...采用液液萃取(liquid-liquid extraction,LLE)和顶空固相微萃取(headspace solid-phase microextraction,HS-SPME)结合全二维气相色谱-飞行时间质谱(comprehensive two-dimensional gas chromatography/time-of-flight mass spectrometry,GC×GC-TOFMS)技术解析了天龙泉米香型白酒挥发性组分特征。采用该技术并结合多种检索比对方式在天龙泉米香型白酒中鉴定出挥发性化合物505种,其中339种为天龙泉米香型白酒的潜在香气活性组分,包括86种酯类、50种芳香族、42种醇类、40种醛类、32种含氧杂环化合物、30种酮类、25种萜烯类、19种有机酸类、11种含硫化合物和4种含氮杂环化合物,表明了米香型白酒中香气成分的多样性和复杂性。在挥发性香气化合物含量角度上,不同贮存期的米香型白酒样品呈现明显差异,在时间维度上具有一定规律。其中,变化较大的化合物是醇类化合物、酯类化合物和醛类化合物,可能是受到了企业生产工艺的调整和陈化过程中发生的化学反应共同影响。该研究更深入地认识了米香型白酒的挥发性风味物质,丰富了米香型白酒风味化学的研究体系。展开更多
为了明确依达拉奉注射液的杂质,优化其生产工艺,采用高效液相色谱-四极杆飞行时间质谱(high performance liquid chromatography-quadrupole time-of-flight tandem mass spectrometry,HPLC-Q-TOF-MS)联用技术对依达拉奉注射液及其强制...为了明确依达拉奉注射液的杂质,优化其生产工艺,采用高效液相色谱-四极杆飞行时间质谱(high performance liquid chromatography-quadrupole time-of-flight tandem mass spectrometry,HPLC-Q-TOF-MS)联用技术对依达拉奉注射液及其强制降解实验样品中的杂质结构进行鉴定.结果显示:①HPLC-Q-TOF-MS对依达拉奉及其杂质分离能力良好;②依达拉奉注射液及其强制降解实验样品中共检出8个主要杂质,其中3个为已知杂质,分别为杂质4(依达拉奉杂质Ⅳ)、杂质6(依达拉奉杂质Ⅰ)和杂质8(依达拉奉杂质Ⅲ);③依达拉奉易被氧化,依达拉奉杂质Ⅰ和依达拉奉杂质Ⅲ为氧化降解杂质.展开更多
文摘The CI-TOFMS of ketoprofen (KP), β-cyclodextrin (CD) and their inclusion complex (KP-CD) have been reported. There are no [M+H]^+ peaks of both KP-CD and CD in their spectra due to the samples involatile and thermal instable. A base peak at m/z 255 in the spectra of both KP and KP-CD was found, which can be assigned to [M+H]^+of KP or inclusive KP (KPi). Three fragment ions a, b and c were formed in the spectra of both KP and KPi with different abundances for the same ions. All the fragment ions of CD and inclusive CD (CDi) have been assigned.
文摘采用液液萃取(liquid-liquid extraction,LLE)和顶空固相微萃取(headspace solid-phase microextraction,HS-SPME)结合全二维气相色谱-飞行时间质谱(comprehensive two-dimensional gas chromatography/time-of-flight mass spectrometry,GC×GC-TOFMS)技术解析了天龙泉米香型白酒挥发性组分特征。采用该技术并结合多种检索比对方式在天龙泉米香型白酒中鉴定出挥发性化合物505种,其中339种为天龙泉米香型白酒的潜在香气活性组分,包括86种酯类、50种芳香族、42种醇类、40种醛类、32种含氧杂环化合物、30种酮类、25种萜烯类、19种有机酸类、11种含硫化合物和4种含氮杂环化合物,表明了米香型白酒中香气成分的多样性和复杂性。在挥发性香气化合物含量角度上,不同贮存期的米香型白酒样品呈现明显差异,在时间维度上具有一定规律。其中,变化较大的化合物是醇类化合物、酯类化合物和醛类化合物,可能是受到了企业生产工艺的调整和陈化过程中发生的化学反应共同影响。该研究更深入地认识了米香型白酒的挥发性风味物质,丰富了米香型白酒风味化学的研究体系。
文摘为了明确依达拉奉注射液的杂质,优化其生产工艺,采用高效液相色谱-四极杆飞行时间质谱(high performance liquid chromatography-quadrupole time-of-flight tandem mass spectrometry,HPLC-Q-TOF-MS)联用技术对依达拉奉注射液及其强制降解实验样品中的杂质结构进行鉴定.结果显示:①HPLC-Q-TOF-MS对依达拉奉及其杂质分离能力良好;②依达拉奉注射液及其强制降解实验样品中共检出8个主要杂质,其中3个为已知杂质,分别为杂质4(依达拉奉杂质Ⅳ)、杂质6(依达拉奉杂质Ⅰ)和杂质8(依达拉奉杂质Ⅲ);③依达拉奉易被氧化,依达拉奉杂质Ⅰ和依达拉奉杂质Ⅲ为氧化降解杂质.
