搜搜考试网求高手帮忙翻译一下,急啊!
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求高手帮忙翻译一下,急啊!
Mass spectrometry
An Agilent XCT Plus ion trap mass spectrometer
(ITMS)(AgilentTechnology,US)wasusedtoanalyze
the fractions, Fr. 1–10, obtained from ethyl acetate
extracts. Atmospheric pressure chemical ionization
(APCI) MS was performed in the positive mode. The
dry gas and vaporiser temperatures were 350 and
4008C, respectively.
For the analysis of CP1, Electrospray-Ionization
Mass Spectrometry (ESI-MS) was performed using a
Waters Micromass Q-Tof micro mass spectrometer
(Waters,USA).Samplewasdirectlyinfusedataspeed
of 10ml/min for acquiring mass spectra. The capillary
and sample cone voltages were maintained at 3.0kV
and 50V, respectively. The source and desolvation
temperatures were 80 and 2508C, respectively. The
mass spectra were acquired from m/z 100 to 5000 in
the positive ion mode.
Nuclear magnetic resonance spectrometry (NMR)
The NMR spectra of compound 1, CP1 and CP2
were recorded on a Bruker Advance AMX500 NMR
spectrometer(Rheinstetten, Germany) at500.13MHz
1 13
( H)and125.75MHz( C),respectively.Tetramethyl-
silane (TMS) was used as an internal standard.
Compound 1 was dissolved in methanol-d4; CP1 and
CP2weredissolvedinD2O.
Statistical analysis
The mean values were calculated from data taken
from at least three separate experiments. Where
significance testing was performed, a Student’s t-test
was used; P-values of ,0.05 were considered to be
statistically significant.
Results
No significant differences in TEAC value or HPLC
profile were detected between different bottles of the
same commercial batch. The antioxidant components
in DSS were found to be stable during 1–2 months
storage, based on the TEAC value and their HPLC
profile.
Separation and characterization of low molecular mass
components
DSS was extracted with methanol, and the methanol
extract was further partitioned with ethyl acetate as
described in Material and Methods. The three
fractions of DSS, MeOH-R, EtOAc-extract and
EtOAc-R were subjected to the ABTS assay. The
MeOH-Rfraction contributed about 60%of the TAA
of DSS. However, the EtOAc-extract showed the
Mass spectrometry
An Agilent XCT Plus ion trap mass spectrometer
(ITMS)(AgilentTechnology,US)wasusedtoanalyze
the fractions, Fr. 1–10, obtained from ethyl acetate
extracts. Atmospheric pressure chemical ionization
(APCI) MS was performed in the positive mode. The
dry gas and vaporiser temperatures were 350 and
4008C, respectively.
For the analysis of CP1, Electrospray-Ionization
Mass Spectrometry (ESI-MS) was performed using a
Waters Micromass Q-Tof micro mass spectrometer
(Waters,USA).Samplewasdirectlyinfusedataspeed
of 10ml/min for acquiring mass spectra. The capillary
and sample cone voltages were maintained at 3.0kV
and 50V, respectively. The source and desolvation
temperatures were 80 and 2508C, respectively. The
mass spectra were acquired from m/z 100 to 5000 in
the positive ion mode.
Nuclear magnetic resonance spectrometry (NMR)
The NMR spectra of compound 1, CP1 and CP2
were recorded on a Bruker Advance AMX500 NMR
spectrometer(Rheinstetten, Germany) at500.13MHz
1 13
( H)and125.75MHz( C),respectively.Tetramethyl-
silane (TMS) was used as an internal standard.
Compound 1 was dissolved in methanol-d4; CP1 and
CP2weredissolvedinD2O.
Statistical analysis
The mean values were calculated from data taken
from at least three separate experiments. Where
significance testing was performed, a Student’s t-test
was used; P-values of ,0.05 were considered to be
statistically significant.
Results
No significant differences in TEAC value or HPLC
profile were detected between different bottles of the
same commercial batch. The antioxidant components
in DSS were found to be stable during 1–2 months
storage, based on the TEAC value and their HPLC
profile.
Separation and characterization of low molecular mass
components
DSS was extracted with methanol, and the methanol
extract was further partitioned with ethyl acetate as
described in Material and Methods. The three
fractions of DSS, MeOH-R, EtOAc-extract and
EtOAc-R were subjected to the ABTS assay. The
MeOH-Rfraction contributed about 60%of the TAA
of DSS. However, the EtOAc-extract showed the
质谱分析法
美国安捷伦科技公司添加了XCT离子捕获迁移质谱,被用于分析片段,从乙酸乙酯提淬物中获得1-10的频率,大气压化学电离的毫秒在其过程中得以正确体现.干气以及蒸发器的温度分别达到350和4008摄氏度.
美国安捷伦科技公司添加了XCT离子捕获迁移质谱,被用于分析片段,从乙酸乙酯提淬物中获得1-10的频率,大气压化学电离的毫秒在其过程中得以正确体现.干气以及蒸发器的温度分别达到350和4008摄氏度.