Publications by authors named "Dingxiang He"
The incorporation of rare earth oxides and nano-silica has been found to significantly enhance the mechanical and tribological characteristics of phenolic-based hybrid nanocomposites. In this work, the impact of these additives was investigated through single-factor experiments. The study revealed that cerium oxide and yttrium oxide were the primary factors influencing changes in the impact strength, shear strength, coefficient of friction, and wear rate.
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- Bletilla Tuber, derived from the dried tuber of Bletilla striata, is utilized in traditional Chinese medicine for its astringent and hemostatic properties, helping treat ulcers, bleeding, and burns.
- A study compared two types of Bletilla Tuber, one that underwent extensive heat processing (BT1) and another that was normally processed (BT2), analyzing their chemical constituents and NO inhibitory activities.
- The analysis revealed that while heat processing altered some compounds (specifically glucosyloxybenzyl 2-isobutylmalates), the key compounds responsible for suppressing NO activity (phenanthrenes and bibenzyls) remained unchanged, indicating that the medicinal qualities of B
[Chemical constituents from tuber of Cremastra appendiculata].
Zhongguo Zhong Yao Za Zhi
December 2005
Objective: To investigate the chemical constituents from the tuber of the planted Cremastra appendiculata.
Method: The compounds were isolated by column chromatography over silica gel, Sephadex LH-20 and RP-HPLC, and their structures were elucidated on the basis of spectroscopic analysis.
Result: Eight compounds were isolated, and identified as cirrhopetalanthrin (I), 7-hydroxy-4-methoxyphenanthrene-2-O-beta-D-glucoside (II), 4-(2-hydroxyethyl)-2-methoxyphenyl-1-O-beta-D-glucopyranoside (III), tyrosol 8-O-beta-D-gluco-pyranoside (IV), vanilloloside (V), p-hydroxybenzaldehyde (VI), sucrose (VII), adenosine (VIII).
[Studies on chemical constituents from the corm of Cremastra appendiculata].
Zhongguo Zhong Yao Za Zhi
April 2005
Objective: To study the chemical constituents of the corm of the planted Cremastra appendiculata.
Method: The compounds were isolated by column chromatography with silica gel and Sephadex LH-20, and their structures were elucidated by means of spectroscopic methods including 2D NMR techniques.
Result: Six compounds were isolated, and identified as isohircinol (I), flavanthrinin (II), p-hydroxyphenylethyl alcohol (III), 3,4-dihydroxyphenylethyl alcohol (IV), daucosterol (V), beta-sitosterol (VI).