【摘 要】
：
A high performance liquid chromatography coupled with electrospray ionization-tandem mass spectrometry(HPLC-ESI-MS/MS) method was developed for the analysis and
【机 构】
：
Changchun Center of Mass Spectrometry, Central Laboratory
【基金项目】
：
Supported by the Key Project of Jilin Provincial Science and Technology Department,China;the Project ofChangchun Science and Technology Bureau,China;the Special Cooperative Project for Hi-tech Industr
论文部分内容阅读
A high performance liquid chromatography coupled with electrospray ionization-tandem mass spectrometry(HPLC-ESI-MS/MS) method was developed for the analysis and identification of ginsenosides in the extracts of raw Panax ginseng(RPG) and steamed Panax ginseng at high temperatures(SPGHT).A total of 25 ginsenosides were extracted include of which 10 low-polar ginsenosides,such as ginsenosides F4,Rk3,Rh4,20S-Rg3,20R-Rg3 and so on,were identified according to their HPLC retention time and MS/MS data.The results indicated that the low polar ginsenosides were seldom found in RPG.For the exploration of the transformation pattern of the ginsenosides in steam processing,the standards of ginsenosides Re,Rgl,Rbl,Rc,Rb2,Rb3 and Rd were selected and hydrolyzed at a temperature of 120 ℃.The results show that these polar ginsenosides can be converted to low-polar ginsenosides such as Rg2,Rg6,F4,Rk3 and Rg5 by hydrolyzing the sugar chains.
其他文献
A series of catalysts of 12-Phosphotungstic acid (PW) and its cesium salts immobilized on dealuminated ultra-stable Y zeolite (DUSY) were prepared. Their specif
The constitutive equation under the low-cycle fatigue (LCF) was discussed,and a two-dimensional (2-D) model for simulating fatigue crack extension was put forwa
A series of poly{2,5-bis[(4-butoxyphenyl)-oxycarbonyl]styrenes} (PBPCS) with low molecular weight distribution was synthesized by atom transfer radical polymeri
Theoretically, the constant stress patch test is not rigorous. Also, either the patch test of non-zero constant shear for Mindlin plate problem or non-zero stra
Several imidazolium ionic liquid (IL)-supported sulfonic acids with different anions,[C3SO3Hmim]HSO4,[C3SO3Hmim]BF4,[C3SO3Hmim]PF6,and [C3SO3Hmim]CF3SO3,were sy
Polyaniline film was prepared by electrochemical method in an acidic solution of aniline.The micromorphology of the polyaniline film was transformed to three-di
In search of environmentally benign insecticides with high activity,low toxicity and low resistance,a series of novel anthranilic(isophthalic) acid esters was d
A series of Ce-doped MnOx/TiO2 catalysts were prepared by impregnation method and used for catalytic oxidation of NO in the presence of excess O2.The sample wit
The rock permeability is an important parameter in the studies of seepage and stress coupling.The micro-cracks and pores can initiate and grow on a small scale
This paper deals with a coupled system of fourth-order parabolic inequalities ｜u｜ ≥ -△2u + ｜v｜q,｜v｜t ≥ -△2v + ｜u｜P in S =Rn × R+ with p,q ＞ 1,n ≥ 1.A FujitaLiouvil