Preparative Isolation and Purification of Linderalactone and Lindenenol from Radix linderae by HSCCC

Chemical characteristics of the sesquiterpenes and diterpenes from Lauraceae family and their multifaceted health benefits: A review

Lauraceae is a large family with significant economic and medicinal value. Bioactive ingredients from Lauraceae plants have contributed greatly to medicines, food nutrients and fine chemical products. In recent years, quite a few sesquiterpenes and diterpenes with unique structures have been achieved from Lauraceae and their potential benefits are embodied in a wide range of health areas. To our knowledge, there is no review to summarizes these constituents and their biological effects systematically. This current work aims to classify and ascribe the structural types and bioactivities of the identified sesquiterpenes and diterpenes. Herein, a total of 362 sesquiterpenes and 69 diterpenes were comprehensively complied. The various bioactivities could be recognized as cytotoxicity, anti-proliferation and/or anti-apoptosis, anti-inflammation, anti-oxidation, anti-bacterium, etc. This updated data could serve as a catalysis of these sesquiterpenes and diterpenes for the future medical and industrial applications.

Linderolide U, a new sesquiterpene from Lindera aggregata root

A new sesquiterpene, namely linderolide U (1), was isolated from the root of Lindera aggregata (Sims) Kosterm along with five known sesquiterpenes (2-6). The structures of the obtained compounds were identified by spectroscopic methods, specifically nuclear magnetic resonance (NMR) spectroscopy and mass spectrometry (MS). The acquired data were compared with those previously reported in the literature. The anticancer effects of the isolated natural products were studied using the HCT116 human colon cancer cell line. Compound 5 was found to significantly suppress cell proliferation, which was associated with induction of apoptosis and cell cycle arrest (G2/M and S phase). The findings of the present study suggest derivative 5 as a potential agent for the treatment of colon cancer.

Sesquiterpene lactones from the roots of Lindera strychnifolia

Phytochemical investigation of the roots of Lindera strychnifolia resulted in the isolation of seven sesquiterpene lactones named linderolide G-M (1-7), together with twelve known sesquiterpenes. The structures and relative configurations of 1-7 were determined through spectroscopic observations, and the absolute configurations were defined by CD analysis. Linderolide G (1) and lindestrene (16) showed cytotoxicity against HSC-T6 hepatic stellate cells.

Rapid isolation and purification of inotodiol and trametenolic acid from Inonotus obliquus by high-speed counter-current chromatography with evaporative light scatting detection

INTRODUCTION

In Eastern Europe, especially Russia, the fruiting body of Inonotus obliquus has been used as a folk medicine for cancer since the sixteenth or seventeenth century. Inotodiol and trametenolic acid are considered to be the main bioactive compounds of the fruiting body of the mushroom. These compounds show various biological activities, including anti-tumour, anti-viral, hypoglycaemic, anti-oxidant and cyto-protective. However, effective methods for isolating and purifying inotodiol and trametenolic acid from the fruiting body of Inonotus obliquus are not currently available.

OBJECTIVE

To develop a suitable preparative method in order to isolate inotodiol and trametenolic acid from a complex Inonotus obliquus extract by preparative high-speed counter-current chromatography (HSCCC).

METHODOLOGY

Inotodiol and trametenolic acid were rapidly isolated and purified from the chloroform extract of Inonotus obliquus (Fr.) by HSCCC with evaporative light scatting detection (ELSD). The purity of the obtained target compounds was analysed by high-performance liquid chromatography (HPLC) with ELSD. The structures of the two compounds were identified by ¹H NMR and ¹³C NMR.

RESULT

The target compounds were finally isolated and purified with a solvent system of hexane:ethyl acetate:methanol:water (1:0.4:1:0.4, v/v/v/v). In a single operation, 100 mg of the I. obliquus extracts yielded 13.0 mg of inotodiol and 7.0 mg of trametenolic acid. The entire separation and purification process took less than 5 h. The purities of obtained inotodiol and trametenolic acid were 97.51 and 94.04%, respectively.

CONCLUSION

HSCCC-ELSD was an efficient and rapid method for the separation and purification of inotodiol and trametenolic acid from I. obliquus.

Two-Step Purification of Cordycepin from Cordyceps Millitaris by High-Speed Countercurrent Chromatography

Cordycepin is successfully isolated and purified from Cordyceps millitaris in two-step purification by high-speed countercurrent chromatography. Two solvent systems, ethyl acetate-1-butanol-water (3:2:5, v/v/v) and trichloromethane-methanol-1-butanol-water (2:1:0.25:1, v/v/v/v), were used for the two-step purification. The purity of the prepared cordycepin was 98.1% according to the high-performance liquid chromatography analysis.

Natural product isolation

Since the 1990s, interest in natural product research has increased considerably. Following several outstanding developments in the areas of separation methods, spectroscopic techniques, and sensitive bioassays, natural product research has gained new attention for providing novel chemical entities. This updated review deals with sample preparation and purification, recent extraction techniques used for natural product separation, liquid-solid and liquid-liquid isolation techniques, as well as multi-step chromatographic operations. It covers examples of papers published since the NPR review 'Modern separation methods' by Marston and Hostettmann,1 with major emphasis on methods developed and the research undertaken since 2000.