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To analyze the chemical components of the tender leaves of Cyclocarya paliurus, a rapid qualitative analysis of the chemical components of the percolation extracts of the tender leaves of Cyclocarya paliurus was carried out by ultrahigh-performance liquid chromatography coupled with quadrupole-time-of-flight tandem mass spectrometry (UHPLC-Q-TOF-MS/MS). Mass spectrum data were collected in the positive and negative ion modes, and MassHunter qualitative analysis software was used, according to the retention time and mass spectrum information of each compound, combined with existing literature and mass spectrum databases, the compounds were analyzed for the fragmentation rule, 94 compounds were identified from Cyclocarya paliurus, including 29 flavonoids, 16 triterpenes, 25 organic acids, 24 other compounds. The analysis results showed that the percolation extract of Cyclocarya paliurus contained flavonoids, organic acids, triterpenoids, coumarins, amino acids, and other compounds, and malic acid, hesperidin, rosin, 6,7-dihydroxycoumarin, 6-methylcoumarin, 5,7-dimethoxycoumarin are found in Cyclocarya paliurus for the first time. This study can lay a foundation for further clarifying the material basis of Cyclocarya paliurus. It provides a theoretical basis for the development of relevant products of Cyclocarya paliurus.

Two chitooligosaccharides, Ch1100 (average molecule weight: 1,100; average degree of polymer: 7) and Ch500 (average molecule weight: 500; average degree of polymer: 3), were obtained by partial hydrolysis of chitosan. Their antioxidant activities were investigated with scavenging activity of chitooligosaccharide against superoxide radical using phenazin methosulphate (PMS)–β-nicotinamide adenine dinucleotide (NADH)–nitroblue tetrazolium (NBT) system, scavenging activity of chitooligosaccharide against carcinogen-induced active oxygen species and scavenging activity of chitooligosaccharide against hydrogen peroxide released from polymorphonuclear leukocytes stimulated by phorbol-12-myristate-13-acetate (PMA). By the aforementioned three measurements, the radical scavenging activity (Inhibition%) of Ch1100 was determined to 54.8, 35.3 and 38.9%, respectively, at the concentration of 100 μmol/L, while that of Ch500 was 40.1, 13.9 and 18.2%, respectively, at the same concentration. These results clearly suggest that Ch1100 is a potent radical scavenger, which has the high radical scavenging activity. [ABSTRACT FROM AUTHOR]