Objective To establish a quantitative analysis of multi-components by single marker (QAMS) method for the simultaneous determination of 9 kinds of components in Andrographis paniculata. Method The relative calibration factors of andrographolide with forsythitin, oleanolic acid, caffeic acid, andrographolide, dehydrated andrographolide, andrographolide, deoxyandrographolide, dehydrated andrographolide half succinate and sodium bisulfite were established by ultra performance liquid chromatographolide-tandem mass spectrometry. The relative correction factor was used to calculate the content of each component, and the calculated results of QAMS method were compared with the measured values of external standard method. Results The relative correction factors showed good reproducibility, and there was no significant difference between the results obtained by the QAMS method and the external standard method. Conclusion The QAMS method is suitable for the simultaneous determination of 9 kinds of components in Andrographis paniculata, ensuring the reliability of quality.

Objective To optimize the decolorization process of Cistanche deserticola polysaccharides and explore their antioxidant activity. Methods Using activated carbon as a decolorizing agent, the effects of 4 factors including activated carbon dosage, decolorization temperature, decolorization time, and pH on decolorization rate and polysaccharide recovery rate were investigated. Based on single factor experiments, the decolorization process of Cistanche deserticola polysaccharide extract was optimized using response surface methodology. Using an in vitro antioxidant activity evaluation method, the free radical scavenging ability of 1,1-diphenyl-2-picrylhydrazine (DPPH), total reducing ability, hydroxyl radical scavenging ability, and 2,2'-azino bis(3-ethylbenzothiazole- 6-sulfonic acid) diammonium salt (ABTS) cation free radical scavenging ability of the polysaccharides from Cistanche deserticola were determined. Results The optimal decolorization process conditions for the extract of polysaccharides from Cistanche deserticola were as follows: Active carbon dosage 20%, decolorization temperature 37 ℃, decolorization time 49 min, pH 5.03. Under these optimal conditions, the decoloizration rate and polysaccharide recovery rate were 62.66% and 96.16%, respectively. After decolorization, the capabilities of scavenging DPPH radical and hydroxyl free radical was significantly increased, while the capabilities of scavenging ABTS anion radical was significantly decreased. Conclusion The decolorization process is easy to operate, with good decolorization effects and polysaccharide recovery rate. It has important application value and provides basis for the later research and development of Cistanche deserticola polysaccharide.

Objective To prepare colloidal gold immunochromatographic test strips for the rapid detection of acetamiprid residues in vegetables. Methods The immunogen was obtained through hapten synthesis, and a highly sensitive and specific monoclonal antibody against acetamiprid was developed using animal immunization and hybridoma technology. Based on this antibody, parameters such as membrane-coating conditions were optimized to prepare immunocolloidal gold test strips. These test strips, combined with colorimetric analysis, were applied for the quantitative detection of acetamiprid residues in various vegetables. Results Under optimal working conditions, the established method achieved a limit of detection of 0.23 μg/kg for acetamiprid, with a linear range of 0.42-18.38 μg/kg. The recovery rates for actual sample detection ranged from 70.0% to 88.3%, and the coefficients of variation (CV) for intra-batch and inter-batch experiments were below 12.00% and 11.03%, respectively. Conclusion The rapid test strips can be directly applied for high-throughput on-site screening of acetamiprid residues in vegetables. Additionally, with the assistance of a colorimetric analyzer, quantitative acetamiprid detection can also be achieved.

Objective To establish a method for the simultaneous determination of functional components in extracts from 7 kinds of medicinal and food homologous substances: Pueraria lobata, Sophora japonica, Lonicera japonica, Cistanche deserticola, Siraitia grosvenorii, Panax ginseng and Hovenia dulcis by high performance liquid chromatography (HPLC). Methods The analysis was conducted using an Agilent Eclipse XDB-C₁₈ column (4.6 mm× 250 mm, 5 μm) with a mobile phase gradient elution of acetonitrile-0.1% phosphoric acid at a flow rate of 0.6 mL/min, a column temperature of 30 ℃, a detection wavelength of 210 nm, and an injection volume of 5 μL. This method was employed to quantify the content of puerarin, rutin, chlorogenic acid, echinacoside, verbascoside, mogroside V, ginsenoside Re and dihydromyricetin. Results The results demonstrated that 8 kinds of functional components exhibited excellent linear relationships within their respective concentration ranges, with correlation coefficients (r²) exceeding 0.999. The limits of detection ranged from 0.02 to 1.88 mg/L, and the limits of quantification ranged from 0.08 to 3.62 mg/L. The precision experiment results showed that the relative standard deviation (RSD) was less than 3%, the average recoveries of spiked samples ranged from 95.49% to 109.87%. Conclusion This method is simple, rapid and highly accurate, making it suitable for the qualitative and quantitative analysis of the functional components in the aforementioned 7 kinds of medicinal and food homologous substances.

Objective To establish a specific identification method for Ganoderma lucidum extract, and achieve the synchronous determination of a variety of monosaccharides. Methods The analysis of monosaccharide composition in Ganoderma lucidum extracts was conducted using a pre-column derivatization reversed-phase liquid chromatography method. A quantitative analysis of multi-components by single-marker method was established to determine the monosaccharide content in Ganoderma lucidum extracts. Results Ganoderma lucidum extract from 3 manufacturers contained mannose, glucose and galactose, but the proportion of monosaccharides in 4 batches was significantly different. The content of mannose, glucose and galactose could be determined by one test and multiple evaluation method at the same time. The relative deviation from external standard method was less than 5%, and there was no significant difference, which was feasible. Conclusion This study analyzes the monosaccharide composition and monosaccharide ratio in Ganoderma lucidum extract, which can serve as an auxiliary means for identifying the quality of Ganoderma lucidum polysaccharides in Ganoderma lucidum extract. It provides a reference for enterprises to monitor the quality of extracts.

Objective To explore the dose effects and molecular mechanism of B-type proanthocyanidins trimer, the main active component of Litchi chinensis Sonn pulp phenolics, on hepatocyte triglyceride (TG) deposition. Methods HepG2 cell steatosis model induced by oleic acid (OA) was treated with different mass concentrations (0.5-10.0 μg/mL) of B-type proanthocyanidins trimer. The content of TG and the expressions of genes related to lipid absorption, transport and oxidation, together with apoptosis of hepatocytes, were detected in oleic acid loaded hepatocytes. Results B-type proanthocyanidins trimer (0.5-10.0 μg/mL) all significantly inhibited TG accumulation in oleic acid-loaded hepatocytes, while no dose dependence was observed. Low-dose (1.0 μg/mL) B-type proanthocyanidins trimer inhibited hepatocyte apoptosis by increasing the relative expression ratio of Bcl-2 to Bax, thereby reducing TG accumulation in hepatocytes. In addition to the above-mentioned pathway, medium/high-dose (5.0 μg/mL, 10.0 μg/mL) B-type proanthocyanidins trimer also inhibited lipid absorption in hepatocytes by down-regulating CD36 and FATP2 expression, and promoted hepatocytes lipolysis by up-regulating ACSL1 and CPT1α expression, hence reducing TG accumulation in hepatocytes. Conclusion B-type proanthocyanidins trimer of Litchi chinensis Sonn pulp can inhibit lipid absorption, promote β-oxidation of fatty acids and inhibit excessive apoptosis of liver tissue cells, thereby improving lipid metabolism and preventing fatty liver.

At present, the demand for acaricides in agricultural production in China ranks second only to insecticides. As an important chemical pollutant affecting the safety of agricultural products, acaricides, represented by heterocyclic compounds, have relatively stable structures, long half lives, are not easily degraded, and are more likely to remain on the surface or inside of food, causing serious food safety problems. The development of economically effective detection methods for heterocyclic acaricides has become a current research trend, which is of great significance for ensuring the safety of public vegetable baskets, promoting green ecological agriculture, and advancing high-quality agricultural development. Immunoassay methods are widely used in the field of pesticide residue detection due to their fast, simple, efficient, and sensitive characteristics. This paper reviewed the research progress of immunological analysis methods for heterocyclic acaricides pesticides from the aspects of synthesis of haptens, preparation of antibodies, and their detection applications in agricultural product matrices, analyzed the challenges and future development prospects of immunoassay methods, which have certain reference value for the detection of heterocyclic acaricides residues.

Objective To study the Morchella eohespera mycelium extracellular polysaccharides (MEP), purify MEP-H and MEP-N by DEAE Sepharose Fast Flow column chromatography, and analyze their physicochemical properties, hypoglycemic activities, and antioxidant activities in vitro. Methods The physicochemical properties of MEP-H and MEP-N were studied by carbohydrate content determination, analysis of ultraviolet scanning, Fourier transform infrared spectroscopy analysis, and scanning electron microscopy. The hypoglycemic activities and antioxidant activities of MEP-H and MEP-N were evaluated by α-amylase inhibition rate, α-glucosidase inhibition rate, 1,1-diphenyl-2-picrylhydrazyl (DPPH) free radical scavenging ability, 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) ammonium salt (ABTS) cationic free radical scavenging ability, reducing power and superoxide anion scavenging ability. Results The carbohydrate content of MEP-H and MEP-N was (78.12±0.14)% and (77.37±0.03)%, respectively. Hypoglycemic studies showed that at a mass concentration of 0.75 mg/mL, MEP-H and MEP-N had the highest α-amylase inhibition rates, which were (8.06±1.93)% and (11.08±1.05)%, respectively; at a mass concentration of 0.50 mg/mL, MEP-H and MEP-N had the highest α-glucosidase inhibition rates, which were (74.93±2.72)% and (69.48±2.97)%, respectively. Antioxidant studies showed that MEP-H and MEP-N achieved the best DPPH free radical scavenging activity at mass concentrations of 4 mg/mL and 2 mg/mL, with scavenging rates of (47.54±10.88)% and (47.16±6.91)%, respectively; at a mass concentration of 8 mg/mL, the maximum ABTS cationic free radical scavenging rates of MEP-H and MEP-N were (8.67±0.53)% and (17.00±4.21)%, respectively, the maximum reducing power absorbance values were 0.13±0.004 and 0.17±0.008 respectively, and the maximum superoxide anion scavenging rates were (40.95±6.02)% and (29.87±3.18)%, respectively. Conclusion Both MEP-H and MEP-N, the extracellular polysaccharides from the mycelium of Morchella eohespera, exhibit hypoglycemic and antioxidant activities. This study provides a theoretical basis for further research on liquid fermentation of Morchella eohespera.

Objective To establish an analytical method for the determination of 6 kinds of Sudan dyes in Capsicum annuum powder based on liquid-liquid microextraction with deep eutectic solvents (DES) combined with high performance liquid chromatography. Methods Sudan red I, Sudan red II, Sudan red III, Sudan red IV, Sudan red 7B and Sudan red G in Capsicum annuum powder were extracted by liquid-liquid microextraction. The extract was filtered through a microporous membrane and then determined by high performance liquid chromatography with external standard method for quantification. The effects of DES dilution ratio, DES molar ratio, DES addition amount, extraction time, and extraction method on the extraction efficiency of 6 kinds of Sudan dyes were investigated. Results The results showed that the optimal method conditions were: Dilution ratio of DES 5 times, molar ratio of DES 1:2.5, addition amount of DES 600 μL, extraction time 50 s, and extraction method was vortex extraction. Under these conditions, the established equation had a good linear relationship in the range of mass concentration 0.1-50.0 mg/L, the correlation coefficients were all greater than 0.999, the limits of detection were 0.03-0.20 mg/kg, and the limits of quantitative were 0.10-1.00 mg/kg. The recovery rates of Sudan red G, Sudan red I, and Sudan red II were higher, ranging from 71.6% to 117.5%, with relative standard deviations of 0.6% to 4.7%. Conclusion The established method is simple, efficient, and environmentally friendly, and can be used for rapid detection of 6 kinds of Sudan dyes in Capsicum annuum.

Objective To establish a method for the determination of 11 kinds of residues of benzimidazole drugs in freshwater fish and shrimp by ultra performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS). Methods The samples were first extracted by acetonitrile twice, purified by mixed strong cationic solid phase extraction column, then separated by Waters C₁₈ column, detected by UPLC-MS/MS, and the internal standard method was adopted for quantitative analysis. Results The 11 kinds of benzimidazole drugs showed good linear relationships at 1.0-50.0 μg/L, with correlation coefficients (r²) greater than 0.99. The ranges of spiked recovery rates for 3 concentrations of blank fish samples were between 78.4% and 104.3%, and the relative standard deviations of the recovery rates for 3 concentrations were between 2.0% and 8.8%; the recovery rates of 3 concentrations of shrimp meat blank samples ranged from 73.3% to 107.5%, with relative standard deviations between 1.5% and 8.7%. The limit of detection of the method in this study was 0.5 μg/kg, and the limit of quantification of the method was 2.0 μg/kg. Conclusion The method has good purification effect, stable reproducibility and recovery, and is suitable for the determination of 11 kinds of benzimidazole residues in freshwater fish and shrimp.