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Determination of Ceftazidime-Avibactam Content Employing Green Analytical Chemistry Principles Combined with Response Surface Methodology
摘要: [Objectives] To quantify the content of ceftazidime-avibactam (CAZ-AVI) employing green analytical chemistry principles and assess the environmental sustainability of the proposed method. [Methods] The concentrations of disodium hydrogen phosphate and potassium dihydrogen phosphate, as well as the pH of the buffer solution, were optimized using a Box-Behnken design. The evaluation method's performance was validated through methodological assessment, and its environmental sustainability was appraised employing the AGREE, BAGI, and Complex GAPI tools. [Results] The optimal conditions were determined to be 27.79 mmol/L disodium hydrogen phosphate, 20.27 mmol/L potassium dihydrogen phosphate, and a pH of 3.52. The linear ranges for ceftazidime (CAZ) and avibactam (AVI) were 0.09–2.25 and 0.1–3 μg/mL, respectively, with correlation coefficients exceeding 0.999. The respective contents were 87.61% and 9.90%. Recovery rates were 98.56% for CAZ and 97.57% for AVI, while the detection limits were as low as 0.44 and 0.75 ng/mL, respectively. The green chemistry evaluation yielded a favorable result, with an AGREE score of 0.85. [Conclusions] The method is sensitive, accurate, and environmentally sustainable, making it suitable for the quality inspection of CAZ-AVI.
关键词: Ceftazidime-avibactam (CAZ-AVI), Response surface methodology, Green analytical chemistry (GAC), Content determination, High performance liquid chromatography (HPLC)
Evaluation of Nardosinone Accumulation in Nardostachys jatamansi Based on Expression of Key Leaf Genes
摘要: [Objectives] To analyze the gene expression networks across distinct tissues of Nardostachys jatamansi and elucidate the correlation between key gene expression levels in leaves and nardosinone accumulation in medicinal rhizomes, providing a technical foundation for rapid monitoring of bioactive compound accumulation.[Methods] Transcriptome sequencing coupled with Weighted Gene  Co-expression Network Analysis (WGCNA) was employed to construct gene co-expression networks, Ultra-performance Liquid Chromatography (UPLC) was utilized to quantify nardosinone content across various growth stages. Real-Time Quantitative Polymerase Chain Reaction (RT-qPCR) was integrated to validate spatiotemporal relationships between key gene expression profiles and nardosinone accumulation patterns. [Results] Among seven co-expression modules, the blue module demonstrated an exceptionally strong correlation with nardosinone content (r=0.993, p=1.2×10⁻¹⁵). This module encompassed pivotal genes such as NjDXS3 and NjTPS22. Three-year-old N. jatamansi plants reached peak nardosinone accumulation in September, with leaf expression levels of NjDXS3 closely mirroring this accumulation trend, whereas NjTPS22 expression exhibited minimal temporal variation. A critical threshold ratio exceeding 4.5 for NjDXS3/NjTPS22 expression in leaves signaled peak nardosinone concentrations. [Conclusions] By monitoring the expression ratio of NjDXS3 to NjTPS22 in leaves, the accumulation status of bioactive compounds in medicinal organs can be non-invasively assessed, offering a novel methodology for quality evaluation of N. jatamansi crude drugs.
关键词: Nardostachys jatamansi, Gene expression level, Bioactive compound accumulation, Nardosinone, Evaluation method
Optimization of the Extraction Process and Establishment of the Preparation Method for Guichen Xuanfei Mixture
摘要: [Objectives] To optimize the extraction and preparation processes of Guichen Xuanfei Mixture and establish a foundation for its industrial-scale production. [Methods] Using the dry paste rate as the evaluation index, a single-factor experiment was conducted to examine the effects of soaking time, volume of water added, and extraction duration. Subsequently, orthogonal experiments were employed to optimize the volume of water added, extraction duration, and extraction frequency. Following the determination of the optimal extraction process, process validation tests and pilot-scale production were performed. [Results] The optimal extraction process involved soaking the medicinal materials in water for 30 min, followed by two successive boiling steps. During the first extraction, 8 times the volume of water relative to the material was used, and 6 times the volume was applied during the second extraction. Each extraction was conducted for 1 h. The average dry paste rate obtained from the verification test was 24.25%, while the yield rates for the three batches of pilot-scale production were 93.6%, 93.9%, and 93.6%, respectively. [Conclusions] The optimized extraction and preparation method is rational, stable, and demonstrates excellent reproducibility, making it well-suited for the industrial-scale production of Guichen Xuanfei Mixture. 
关键词: Guichen Xuanfei Mixture, Extraction process, Preparation method
Characteristic Chromatogram of Yao Medicine Kadsura longipedunculata and the Analysis of Its Anwulignan Content and Anti-inflammatory Activity
摘要: [Objectives] To establish a characteristic chromatogram of the traditional Yao medicine Kadsura longipedunculata, develop a method for quantifying its primary component, anwulignan, and evaluate the anti-inflammatory activity of anwulignan. [Methods] Gradient elution was performed using high-performance liquid chromatography (HPLC) with a mobile phase consisting of acetonitrile and 0.5% phosphoric acid solution. A characteristic chromatogram of K. longipedunculata was established, and its similarity was assessed using the Similarity Evaluation System for Chromatographic Fingerprint of Traditional Chinese Medicine (2012 edition). Additionally, the content of anwulignan in K. longipedunculata was quantified. Lipopolysaccharide-induced RAW264.7 macrophages were employed as an inflammatory cell model to investigate the effects of anwulignan on the levels of tumor necrosis factor-α (TNF-α), interleukin-1β (IL-1β), and interleukin-6 (IL-6) in the cell culture supernatant. [Results] The similarity indices of characteristic chromatograms for 10 batches of K. longipedunculata ranged from 0.901 to 0.994, with 9 common peaks identified. Among these, three components were characterized, including changnan schisantherin E, kadsulactone A, and anwulignan. The content of anwulignan was quantified as ranging from (0.72 ± 0.05) to (1.21 ± 0.03) mg/g (n = 3). Furthermore, anwulignan at concentrations of 0.125–0.5 μg/mL significantly reduced the levels of TNF-α, IL-1β, and IL-6 in the supernatant of inflammatory model cells (P < 0.05 or P < 0.01). [Conclusions] HPLC characteristic chromatogram of K. longipedunculata and the method for determining the content of anwulignan have been established. Anwulignan may represent the active ingredient responsible for the anti-inflammatory effects observed in K. longipedunculata.
关键词: Yao medicine Kadsura longipedunculata, HPLC, Characteristic chromatogram, Quality control, Anwulignan, Anti-inflammatory action
Research and Efficacy Analysis of High-Efficiency Intelligent Facility Cultivation Techniques for Hericium erinaceus in Changshan County
摘要: [Objectives] To systematically investigate the high-efficiency intelligent facility cultivation techniques for Hericium erinaceus. [Methods] A three-layer intelligent regulation system encompassing "perception–execution–control" was established to enable precise monitoring and stage-specific automatic adjustment of key environmental parameters, including temperature, humidity, CO2 concentration, and light intensity. Combined with integrated green pest management practices, the effects of intelligent cultivation on mycelial growth, yield, marketable product rate, contamination rate, and overall economic benefits were systematically evaluated. [Results] Compared with traditional facility cultivation, the intelligent cultivation system shortened the time to full mycelial colonization of the substrate bag by 2–3 days, increased the average yield per artificial log by over 30%, achieved a marketable product rate of 92%, reduced the contamination rate to 2.23%, and significantly decreased labor input, resulting in an overall economic benefit increase exceeding 30%. [Conclusions] This technical system effectively addresses the production bottlenecks posed by high humidity and large temperature fluctuations during spring in the Changshan region, thereby achieving stable, high-quality, and efficient cultivation of H. erinaceus. The system demonstrates considerable feasibility for extension and application in regions with similar climatic conditions across the South Yangtze River area and provides a technical reference for the digital and intelligent transformation of the traditional edible mushroom industry.
关键词: Hericium erinaceus, Intelligent facility cultivation, Internet of things (IoT), Precise control