Extraction of biologically active substances from raw walnut (Juglans regia L.) materials: current approaches

DOI: https://doi.org/10.29296/25419218-2019-01-01
Issue: 
1
Year: 
2019

V.V. Vernikovsky(1), Zh.V. Daironas(1), I.N. Zilfikarov(2), Z.D. Khadzhieva(1) 1-Pyatigorsk Medical Pharmaceutical Institute, Branch, Volgograd State Medical University, 11, Kalinin Prospect, Pyatigorsk 357532, Russian Federation 2-All-Russian Research Institute of Medicinal and Aromatic Plants, 7, Grin St., Build. 1, Moscow 117216, Russia

The biologically active substances of walnut (Juglans regia L.) have antioxidant, anthelmintic, antimicrobial, antifungal, cytotoxic, and antidiabetic activities. The main group of its chemical composition are phenolic compounds including naphthoquinones (juglone and its derivatives), flavonoids (juglanin, avicularin, hyperoside), phenolic acids (caffeic, gallic, rosmarinic, chlorogenic, ferulic, etc.), linear or the macrocyclic diarylheptanoids of the biarylic (juglanin B) and diaryl ester (juglanin A and rhoiptelol) types, and tannins. A traditional approach, such as extraction, is used to prepare common and individual herbal medicines from walnut in order to study its chemical composition and pharmacological activity. The most commonly used raw materials are green parts of the plant, primarily leaves and fruits. In doing so, a variety of extraction methods (preference is given to different techniques of maceration) and different solvents, mainly methyl and ethyl alcohols, are applied. The resultant extracts are converted into a dry extract, by using rotary vacuum evaporators, which is due to the greater compactness and convenient storage of this formulation.

Keywords: 
walnut
Juglans regia L.
extraction

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