Xiaoqi Chen,Wei Wang,Cheng Wang,Zijia Liu,Qi Sun,Dongmei Wang
Zanthoxylum bungeanum leaves (ZBL) have rich flavonoids with a variety of bioactivities, which has great values of development and utilization. In this paper, the quality of thirteen varieties of ZBL collected from a common garden was evaluated based on flavonoids compositions, bioactivity and reversed-phase high performance liquid chromatography (RP-HPLC) fingerprint coupled with chemometrics analysis. The values revealed that You Huajiao (S13) exhibited the highest contents of flavonoids compounds and strongest bioactivity, followed by Hancheng Dangcun stingless (S1). Among different varieties HPLC-fingerprint, eight common characteristic peaks were selected and the similarity lay within the range of 0.502-0.999. Meanwhile, thirteen varieties were divided into four groups (G1-G4) and two discriminant functions with the discriminant rate of 100% were constructed. Additionally, quercitrin and afzelin were found to be key compounds of quality evaluation. In conclusion, G4 (You Huajiao, S13) was selected as the best variety, followed by G1 (S1, S3, S5, S6, S7, S10, S12) and G2 (S4, S8, S9, S11), respectively, and G3 (Fugu late-maturing, S2) was at the last level. Consequently, this study screened for fine varieties of ZBL and provided a basis for the development and utilization of high-quality resources of Z. bungeanum .
The phenolic components in Zanthoxylum bungeanum leaves have been shown to contribute significantly to their antioxidant activity. However, the specific contribution of individual monomeric components to this activity remains unclear. This study employed two-dimensional liquid chromatography with electrochemical detection and tandem mass spectrometry (2D-LC-ECD-MS/MS) to rapidly screen and identify these components. A total of 31 antioxidant components were identified, including proanthocyanidins, chlorogenic acids, and flavonoids. The fractions collected from the first-dimension showed significant radical scavenging capacity, with a strong correlation between the response of ECD and antioxidant activity. Eleven compounds were quantitatively analyzed in 24 batches of samples using LC-ECD. While the chemical composition of samples across regions was highly similar, significant differences in content were observed. Quercitrin was the most abundant compound (0.076–3.547 mg/g), significantly higher than other phenolic compounds (p < .05). Samples from the Yuci region of Shanxi exhibited a 75% higher concentration of proanthocyanidins than those from Qianxinan, Guizhou (p < .05), highlighting significant regional variations. This study screened and identified antioxidant components in Zanthoxylum bungeanum leaves and evaluated the quality of samples across origins. The methodology also provides a reference for investigating antioxidants in other edible and medicinal plants.
In recent years, the frequent occurrence of algal blooms has posed continuous threats to aquatic ecosystems and social safety. Environmentally friendly algae-inhibiting methods utilizing allelopathic substances offer advantages such as convenient application and low costs, presenting a bright application prospect in the fields of water and ecological restoration. This study aimed to investigate the procedure for extracting total flavonoids from Zanthoxylum bungeanum leaves and assess allelopathic mechanism of Z. bungeanum leaf extracts on Microcystis aeruginosa . The optimal extraction conditions were determined as follows: solvent-to-material ratio = 10 mL/g; extraction time = 55 min; ethanol volume fraction = 80%; and ultrasonic temperature = 80 °C. Antioxidant activity tests revealed that Z. bungeanum leaf extracts exhibit superior capacity compared to Butylated hydroxytoluene (BHT) but inferior to Vitamin C (VC). Moreover, high-concentration Z. bungeanum leaf extracts can disrupt the structures of oxygen-evolving complexes at the donor sides of photosystem II (PSII) reaction center and influence energy distribution at PSII reaction centers, thereby inhibiting electron transmission activities at both donor and receptor sides of the PSII reaction center. The elucidated allelopathic mechanism of Z. bungeanum leaf extracts provides theoretical evidence for the algal-bloom control and the development of allelopathic algae-inhibiting agents, offering a reference for the further comprehensive development and utilization of Z. bungeanum . Graphical High-concentration Z. bungeanum leaf extracts can disrupt the structures of oxygen-evolving complexes at the donor sides of photosystem II (PSII) reaction center and influence energy distribution at PSII reaction centers, thereby inhibiting electron transmission activities at both donor and receptor sides of the PSII reaction center.
危险品化学品经营许可证（带存储）