Related Experiment Video
Updated: Jan 28, 2026

Extraction and Analysis of Taiwanese Green Propolis
Published on: January 7, 2019
Five novel diarylheptanoids from green walnut husks (Juglans regia L.)
Hong Yang1, Yan Ma1, Changjiu Gao2
1Department of Medicinal Chemistry and Natural Medicine Chemistry, College of Pharmacy, Harbin Medical University, Baojian Road 157, Nangang District, Harbin 150081, PR China.
Abstract:
A ethanol extract of green walnut husks (Juglans regia L.) was isolated by various chromatographic techniques yielding 5 previously unknown diarylheptanoids, namely Juglanin F (1), Juglanin G (2), Juglanin H (3), Juglanin I (4) and Juglanin J (5), respectively, together with 12 known diarylheptanoids. The structures of these 17 compounds were elucidation on the basis of spectroscopic analysis. Upon evaluation of compounds 1-5 on the human hepatoma cells HepG2, compound 3 exhibited moderate inhibitory activity with IC50 27.72 μM.
Related Concept Videos
Green Algae
Monohybrid Crosses
What is Natural Selection?
Dihybrid Crosses
Light as Energy
Photons
A photon is a discrete electromagnetic particle or bundle of energy. Photons are characterized by their frequency, wavelength, and amplitude, similar to the properties of a wave. Waves with higher frequencies transmit more energy and have shorter wavelengths than longer wavelengths that transmit...
Colors and Magnetism
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...

