Citation: HE Wenqian, FAN Qingfei, ZHOU Lan, HUANG Fengmei, JIANG Xian, NA Zhi, HU Huabin, SONG Qishi. Preparation of brazilein from Caesalpinia sappan by high performance countercurrent chromatography[J]. Chinese Journal of Chromatography, ;2020, 38(12): 1363-1368. doi: 10.3724/SP.J.1123.2020.03016 shu

Preparation of brazilein from Caesalpinia sappan by high performance countercurrent chromatography

HE Wenqian ^1,2 ,
FAN Qingfei ^1,2 ,
ZHOU Lan ^1,2 ,
HUANG Fengmei ^1,2 ,
JIANG Xian ³ ,
NA Zhi ¹ ,
HU Huabin ^1,, ,
SONG Qishi ^1,,

1.
CAS Key Laboratory of Tropical Plant Resources and Sustainable Use, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Kunming 650223, China;
2.
University of Chinese Academy of Sciences, Beijing 100049, China;
3.
Puer University, Puer 665000, China

Corresponding author: HU Huabin, SONG Qishi,
Received Date: 18 March 2020

Fund Project: National Key Project of Science and Technology of China "Important New Drugs Innovation" (No. 2017ZX09301045)

Brazilein is among the main chemical constituents of Caesalpinia sappan. It has diverse pharmacological activities. Modern pharmacological studies have shown that the compound has antitumor, anti-inflammatory, antibacterial, antioxidant, immunomodulatory, and other pharmacological activities. Brazilein is often used as a stain in various industries. The separation of brazilein by traditional column chromatography will not only result in contamination of the chromatographic column materials, but also lead to loss of the active ingredient. Countercurrent chromatography is an advanced liquid-liquid chromatographic separation technique. It has been widely used for natural product separation and isolation as it offers several advantages, such as low solvent consumption, a highly selective solvent system, and high recoveries. Typical countercurrent chromatography techniques include centrifugal partition chromatography (CPC), high-speed countercurrent chromatography (HSCCC), and high performance countercurrent chromatography (HPCCC). It is well known that choosing a suitable solvent system is vital in countercurrent separation. Therefore, two methods were introduced for choosing a suitable solvent system. One is the generally useful estimation of solvent systems (GUESS) method, which employs thin-layer chromatography (TLC) to identify a suitable solvent system with minimal labor for the rapid purification of target compounds, and another is the Shake-Flash method. The solvent system could be determined by observing the distribution of the sample in the upper and lower phases. Two kinds of solvent systems were screened using the TLC-GUESS and Shake-Flash methods, and tested through the analysis mode of the HPCCC instrument. The results showed that chloroform-methanol-water (4:3:2, v/v/v) was the optimal solvent system for HPCCC separation. A total of 15.2 mg of brazilein and 5.7 mg of caesappanin C were obtained from an ethyl acetate extract with high purities (95.6% and 89.0%, analyzed by HPLC) in one step using the preparation mode of HPCCC, the reversed-phase liquid chromatography mode with the apparatus rotated at 1600 r/min, a flow rate of 10 mL/min, separation temperature of 25℃, and detection wavelength of 285 nm. Their structures were determined by spectroscopic and spectrometric analyses. Brazilein stained the solid packing material in the column and was difficult to elute. The results showed that the use of HPCCC for the separation of brazilein can not only prevent the loss of target active ingredients in Caesalpinia sappan, but also shorten the separation and purification times and improve the operating efficiency. Therefore, HPCCC can be used for the separation and preparation of other pigment compounds in Caesalpinia sappan and other dye plants.
- high performance countercurrent chromatography (HPCCC),
- high performance liquid chromatography (HPLC),
- brazilein,
- Caesalpinia sappan
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