The Ability of Acid-Based Natural Deep Eutectic Solvents to Co-Extract Elements from the Roots of Glycyrrhiza glabra L. and Associated Health Risks.

The roots of licorice (Glycyrrhiza glabra L.) have been widely used in traditional and officinal medicines for the treatment of different diseases. Natural deep eutectic solvents (NADES) have become popular for the extraction of active principles from medicinal plants. However, the ability of NADES to co-extract trace elements during the isolation of target active compounds is rarely investigated. The aim of this study was to analyze the content of trace elements in acid-based NADES extracts from the roots of G. glabra and the health risks associated with them. In this study, we have tested for the first time the ability of several acid-based NADES to co-extract glycyrrhizic acid (GA) and trace elements from the roots of G. glabra. GA has been identified as the dominant phytochemical in G. glabra NADES extracts (0.145-0.495 mg/g). Due to the close pKa of lactic acid and GA, the yield of GA in lactic acid-based NADES was higher in comparison with other tested NADES. The yield of GA in NADES3-NADES5 was statistically significant and surpassed the yield of GA in water. The recovery of all elements (except Li) by all tested NADES was low (less than 6%). According to an ANOVA test, the hydrogen bond donor type plays a decisive role in the extraction of elements. A strong positive correlation between the recovery of GA and MPI was noted. The metal pollution index, hazard quotient, hazard index, and chronic daily intake were calculated and suggest that all tested NADES extracts of G. glabra roots were nontoxic and possess no health risk for both ingestion and topical application.

Findings of Russian literature on the clinical application of Eleutherococcus senticosus (Rupr. & Maxim.): A narrative review.

ETHNOPHARMACOLOGICAL RELEVANCE: Eleutherococcus senticosus (Rupr. et Maxim.) Maxim (ES) (syn. Acanthopanax senticosus (Rupr. & Maxim.) Harms) is a medicinal plant used in traditional medicine of Russian Far East and East Asia and known as an adaptogen - a category of herbal medicinal products which have non-specific inter-system anti-stress effects throughout the human body. ES was first established as a medicinal plant officially in the pharmacopeia of the Union of Soviet Socialist Republics (USSR) in 1962, and is currently recommended by the European Medicines Agency (EMA) to be prescribed to treat symptoms of asthenia such as fatigue and weakness. AIM OF THE REVIEW: During the time of the USSR, a distinct research directive was undertaken on ES to examine substances which improve stamina and endurance, with over 1000 studies published. Due to security measures within the former USSR these papers were not accessible to the public and were never translated into English. This is the first study to make findings of the USSR studies on ES available to the international research and scientific community. METHODS: This study was an archival retrieval. References for studies were sought from printed journal and conference preceding's publications, then located within library catalogues of three libraries in St Petersburg Russia. Eligibility criteria included human clinical trials examining the efficacy of ES in any condition, published in the Russian language in the Soviet Union. RESULTS: A total of 46 studies published between 1962 and 1986 in the USSR were sourced. Of the retrieved articles, 29 were reported as placebo-controlled trials, 11 were reported as controlled trials and six studies did not report the study design. Trends in studies were those reporting on healthy volunteers (n=21) at a dose of 2 ml extract/day (n=14) examining outcomes such as physical and mental stamina under varying conditions, normal work conditions, high temperatures and high altitudes, incidence or prophylaxis of colds and influenza (n=5), effects on color perception and vision (n=2), work capacity (n=1), cognitive effects (n=1), prophylaxis of hearing loss (n=3), effects on blood cell counts (n=2) and sensitivity to UV radiation (n=1). CONCLUSIONS: ES appears to exhibit benefits for cognitive function and physical and mental endurance and its effect as a respiratory system infection prophylaxis treatment are promising. This study is the first to publish the findings of clinical trials on ES from the USSR, which supports the traditional use and offers a valuable contribution to the body of evidence on medicinal uses of ES when the data is applied within the context of its limitations.