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The separation of structural analogues in natural products has always been one of the challenges in separation science, where supercritical fluid chromatography (SFC) with chiral stationary phases (CSPs) is an unconventional but potential solution. In this study, a preparative two-dimensional chiral SFC (2D cSFC) method that was established with two kinds of CSPs was applied in the isolation of the aliphatic acid derivatives in Piper kadsura (P. kadsura). The RPLC unseparated peaks of two samples A and B of P. kadsura were evenly scattered on the CSP-1 column while they clustered into two groups on the CSP-2 column by SFC. There was impressively complementary selectivity between CSP-1 and CSP-2, which were used for construction of 2D cSFC. The first dimension (D) separation with CSP-1 fractionated the sample A into six parts by a heart-cutting method and the sample B into nine parts for a comprehensive 2D analysis; then 29 and 71 peaks were respectively found in these parts in the second dimension (D) separation with CSP-2. Further through D preparative separation, 19 high purity components were obtained, and the chemical structures of two of them were confirmed, including a novel unsaturated aliphatic acid compound (8Z,10Z)-12-methoxyheptadeca-8,10-dienoic acid and a known octadecadienoic acid lactone Lactariolide. The 2D cSFC method presented the superiority of separating the achiral compounds of complex samples.
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http://dx.doi.org/10.1016/j.jchromb.2021.123079 | DOI Listing |
Angew Chem Int Ed Engl
December 2024
Jilin University College of Chemistry, State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, 2699 Qianjin Street, 130012, Changchun, CHINA.
Developing a simple and efficient catalyst system for closed-loop recycling of polymers to monomers is an essentially important but challenging task for the recycle of polymer wastes and preventing the downcycle of plastic products. Herein, we employ inexpensive, commercially available Lewis acids (LAs) to achieve closed-loop recycling in bulk through the catalytic depolymerization of aliphatic polyesters and polycarbonates. The scope of LAs is screened by thermogravimetric analysis experiments and distillation experiments.
View Article and Find Full Text PDFAntonie Van Leeuwenhoek
December 2024
All-Russian Collection of Microorganisms (VKM), Pushchino Scientific Center for Biological Research, Russian Academy of Sciences, Pushchino, 142290, Russia.
Four salt-tolerant and aromatics degrading strains used in this study were isolated from polluted technogenic soil on the territory of the Verkhnekamsk potash deposit (Russia). The strains were aerobic, Gram-stain-positive, non-motile, non-endospore-forming irregular rods, exhibiting a marked rod-coccus growth cycle. They contained lysine-based peptidoglycan, teichulosonic acid and poly(glycosyl phosphate) polymers in the cell walls.
View Article and Find Full Text PDFAntonie Van Leeuwenhoek
December 2024
GIPhy - Genome Informatics and Phylogenetics, Biological Resource Center of Institut Pasteur, Institut Pasteur, Université de Paris, 75015, Paris, France.
A Gram-staining-positive, aerobic bacterium, designated strain JJ-181, was isolated from the root surface of soybean. Based on the 16S rRNA gene sequence similarities, strain JJ-181 was grouped into the genus Cohnella, most closely related to Cohnella hashimotonis F6_2S_P_1 (98.85%) and C.
View Article and Find Full Text PDFAntonie Van Leeuwenhoek
December 2024
Department of Systems Biotechnology, Chung-Ang University, Anseong, 17546, South Korea.
A Gram-stain-negative, aerobic, non-spore-forming, non-motile, coccus-shaped, and red-pigmented bacterial strain designated as CJ14 was isolated from lettuce cultivation soil in Yong-In, South Korea. Strain CJ14 grew optimally on Luria-Bertani agar at 37 ℃ and pH 7.0 in the absence of NaCl.
View Article and Find Full Text PDFAmino Acids
December 2024
Department of Gastroenterology and Hepatology, Kohnodai Hospital, National Center for Global Health and Medicine, 1-7-1 Kohnodai, Ichikawa, Chiba, 272-8516, Japan.
Little is known about how blood free amino acids (FAAs) change in metabolic dysfunction-associated steatotic liver disease (MASLD). This study aims to identify the imbalance of FAAs in MASLD and explore its correction as a potential therapeutic target. We analyzed plasma FAAs data from 23,036 individuals with steatosis information from a biobank in Japan, and 310 patients with MASLD were enrolled.
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