Objective To understand the drug resistance phenotypes,, carriage of drug resistance genes and virulence genes, serotypes and sequence type (ST) classification of Campylobacter jejuni in Xuzhou from 2023 to 2024. Methods Whole genome sequencing was conducted on Campylobacter jejuni isolated from Xuzhou City in 2023—2024 to understand the molecular characteristics such as virulence genes, drug resistance genes, and multilocus sequence typing. The serotypes related to Guillain-Barré syndrome were identified by real-time fluorescent quantitative polymerase chain reaction (PCR), and the drug resistance phenotypes were determined by agar dilution method. Results Forty-eight strains of Campylobacter jejuni were classified into 24 ST types. ST137 was the most numerous, accounted for 18.75% (9/48). Fifteen strains were found to have serotypes related to Guillain-Barré syndrome. A total of 24 drug resistance genes and 121 virulence genes were detected. The top 3 antibiotics with the highest resistance rates were nalidixic acid (100.00%), ciprofloxacin (100.00%), and tetracycline (97.92%). They were 100.0% sensitive to erythromycin, and the multi-drug resistance rate reached 62.50% (30/48). Conclusion Campylobacter jejuni in Xuzhou area is characterized by a high rate of multi-drug resistance, a relatively high carrying rate of some drug resistance genes, a high carrying rate of virulence genes, a large number of sequence types (ST types), and shows relatively high genetic diversity.

Objective To establish a high-throughput sequencing method for detecting cereal allergen species based on next-generation sequencing technology. Methods Taking Hordeum vulgare, Triticum aestivum, Fagopyrum esculentum and Fagopyrum tataricum as research objects, next-generation sequencing technology was used for the high-throughput identification of cereal allergen samples with different proportions and mixing methods and commercially available samples were collected to verify the method’s applicability. Results In different proportions of simulated samples, Hordeum vulgare, Triticum aestivum, Fagopyrum esculentum and Fagopyrum tataricum were detected, the limit of detection was as low as 0.1%, but the measured relative abundance of species and the actual amount of different additives; in different mixing methods but the same proportion of simulated samples, cereal allergens had been detected; the relative abundance of DNA mixing and mixing of raw materials and raw material mixing methods were different from the actual amount of species, and raw material mixing methods of species relative abundance closer to the exact amount of additives; commercial samples contained varying degrees of grain allergens, while a small number of samples with the ingredient list or label. Conclusion The detection method established in this study enables specific and simultaneous identification of 4 cereal allergens (Triticum aestivum, Hordeum vulgare, Fagopyrum esculentum and Fagopyrum tataricum). By conducting relative quantitative analysis of species abundance, the method can effectively determine the content of cereal allergens in samples.

Objective To study the effects of different concentrations of 1-methylcyclopropene (1-MCP) and phytic acid (PA) on the physiology and storage quality of Lycopersicon esculentum Mill.. Methods Based on the optimal concentration of 1-MCP and PA alone, the study was carried out under the conditions of room temperature (20±1) ℃ and relative humidity (80%-90%), and Lycopersicon esculentum Mill. without preservative treatment were used as the control, the full factorial composite experiments of 0.8 μL/L and 1 μL/L 1-MCP and 0.05% and 0.1% PA were carried out, and measured the mass loss rate, hardness, soluble solids content (SSC), ethylene release, peroxidase (POD) activity, 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging rate, and sensory evaluation of Lycopersicon esculentum Mill. during the storage period. Results The 1 μL/L 1-MCP+0.1% PA treatment group had a sensory evaluation score of 85.6 after 12 d of storage, with a weight loss of 0.93%, hardness of 5.04 kg/cm², SSC content of 8.4%, ethylene release of 0.4398 μL/(kg·h), and POD vigour and DPPH radical scavenging rates of 96.9 U/g FW and 82.60%. Conclusion This study show that 1 μL/L 1-MCP+0.1% PA compound treatment is more helpful for the improvement of POD activity and DPPH radical scavenging rate, which in turn delayed the loss of quality, hardness and SSC, low ethylene release, and the overall maintenance of higher sensory scores, which effectively maintained a better storage quality and prolonged the freshness period of Lycopersicon esculentum Mill., and provided technical references for the freshness preservation of more categories of fruits and vegetables. It provides a technical reference for more categories of fruits and vegetables.

Objective To establish a method for the simultaneous determination of 16 kinds of anesthetics and metabolites residual amount in aquatic products by multi-plug filtration cleanup (m-PFC)-liquid chromatography-tandem mass spectrometry (LC-MS/MS). Methods Samples were extracted with acetonitrile containing 1% formic acid, separated by salting-out, and the upper acetonitrile was purified by m-PFC column packed with anhydrous magnesium sulfate, primary secondary amine (PSA), and enhanced matrix removal-lipid (EMR-Lipid). The targets were separated by C₁₈ column using methanol-2 mmol/L ammonium formate containing 0.1% formic acid as mobile phase for gradient elution, detected by positive or negative electrospray ionization-tandem mass spectrometry under multiple reaction monitoring mode, and quantified with matrix external standard method. Results The 16 kinds of anesthetcs and metabolites showed good linear relationships in their respective concentration ranges (r²>0.996). The limits of detection (S/N=3) and limits of quantitation (S/N=10) were 0.03-0.30 μg/kg and 0.10-1.00 μg/kg. The average recoveries at low, medium and high concentration levels in the blank sample matrix were 79.3%-113.8%, and the relative standard deviations were 1.3%-7.2% (n=6). Conclusion This method is simple to operate, sensitive and good in stability, which can be applied to the rapid detection of 16 kinds of anesthetics and metabolites in aquatic products.

Objective To understand the quality of Triticum aestivum L. in Henan Province from 2020 to 2024. Methods A comparative analysis was conducted on the quality data of Triticum aestivum L. in Henan Province from 2020 to 2024. Results The quality of Triticum aestivum L. in Henan Province showed a fluctuating upward trend from 2020 to 2024. Due to weather conditions, the Triticum aestivum L. quality in 2023 was the worst, with an average test weight of 755 g/L. The proportion of third grade or above (including third grade) was 64.4%, and the average of defected kernel was as high as 34.6%. The overall quality of Triticum aestivum L. in 2022 was the best, with an average test weight of 801 g/L. The proportion of third grade or above (including third grade) was 99.6%, and the average of defected kernel was 2.9%. Through the analysis of Triticum aestivum L. quality over the past 5 years, it was found that Triticum aestivum L. in Henan Province was mainly composed of medium gluten varieties, strong gluten varieties had been effectively promoted throughout the province, and weak gluten Triticum aestivum L. had been well promoted in some areas of Southern Henan. Henan Province had a wide variety of Triticum aestivum L. planting varieties, and the number of Triticum aestivum L. varieties had been increasing year by year in the past 5 years. Conclusion The quality of Triticum aestivum L. in Henan Province is relatively good, mainly consisting of medium gluten varieties, which are suitable for the processing of various flour products. But there are problems such as a wide variety of varieties and a low proportion of large-scale planting.

Objective To explore the antioxidant activity and stability of peptides from the visceral of Todarodes pacificus. Methods Free radical scavenging capacities of peptides from the visceral of Todarodes pacificus were determined, while the effects of temperature, pH and gastrointestinal digestion on the antioxidant activity of peptides from the visceral of Todarodes pacificus were also evaluated. Results The peptides from the visceral of Todarodes pacificus exhibited excellent free radical scavenging abilities, with half maximal inhibition concentration (IC₅₀) values of 1.38, 15.26, 0.90 and 2.21 mg/mL for scavenging 1,1-diphenyl-2-picrylhydrazyl radical (DPPH), 2,2’-azino-bis(3- ethylbenzothiazoline-6-sulfonic acid) diammonium salt (ABTS) cationic radicals, hydroxyl radicals, and superoxide anion radicals, respectively. The antioxidant activity of the peptides remained relatively stable within a temperature range of 25-100 °C. Under pH conditions of 7.0-8.0, their antioxidant activity showed no significant change (P>0.05), but it significantly decreased under strongly acidic or alkaline conditions (P<0.05). After in vitro simulated gastrointestinal digestion, the peptides still maintained strong antioxidant activity. Conclusion The peptides from the visceral of Todarodes pacificus has good antioxidant activity and stability, but it shall be noted that the processing and storage of its related products avoid the influence of high temperature and extreme acid-base conditions. The present research will open up new ways for the high-value utilization of the visceral of Todarodes pacificus resources and provide scientific guidance for the innovative development of natural antioxidant peptides.

Objective To develop Maillard reaction flavors combined with caramelized syrup using natural plants as raw materials. Methods Using tamarind as a raw material, it was treated with composite enzymes and mixed with caramelized syrup for Maillard reaction. The optimal preparation process was determined according to the comprehensive sensory score standard for Maillard flavors. The aroma differences between the Maillard reaction flavors with and without caramelized syrup were analyzed, and volatile aroma compounds were detected using headspace solid-phase microextraction (HS-SPME) coupled with gas chromatography-mass spectrometry (GC-MS). The reasons for the aroma differences were analyzed, and its antioxidant activity was studied using 1,1-diphenyl-2-picrylhydrazyl (DPPH). Results The optimal conditions for tamarind enzymatic hydrolysis were: Temperature 45 ℃, time 4.0 hours, and a composite enzyme ratio of 1:1:1 (m:m:m) for pectinase, cellulase, and papain, with an enzyme dosage of 0.5% of the tamarind amount. At a temperature of 120 ℃, reaction time of 80 minutes, initial pH 8.0, and a material-to-liquid ratio of 5:1 (m:V), the Maillard reaction flavor mixed with caramelized syrup showed the highest sensory score. Under these conditions, 68 volatile compounds were detected in the flavor, with ester, heterocyclic, and ketone volatile compounds accounting for a higher proportion compared to the Maillard flavor without caramelized syrup, imparting a sweet-caramel, roasted-sweet, and rich aroma. Adding caramelized syrup enhanced the antioxidant activity of the flavor, and at a concentration of 10 mg/mL, the DPPH scavenging rate reached 70.8%. Conclusion This study provides a new method for preparing edible flavors through the Maillard reaction with tamarind as the raw material combined with caramelized syrup.

Objective To study the effects of two kinds of processing techniques, ultrafine grinding and spray drying, on the metabolites of apple powder. Methods Liquid chromatography-tandem mass spectrometry was used to compare the effects of ultrafine grinding and spray drying technologies on the types of metabolites, expression abundance, correlation analysis, and kyoto encyclopedia of genes and genomes (KEGG) pathways of apple powder. Results The results indicated that compared with ultrafine grinding, spray-dried apple powder had reduced particle size D[50] 3.91 μm, D[3,2] 2.62 μm, D[4,3] 5.52 μm, increased specific surface area (850.10 m²/kg), and decreased span value (2.51). Principal component analysis showed that the cumulative variance contribution rate of apple powder under these two processing technologies was 82.7%, suggesting that the processing methods had a significant influence on the metabolite composition. A total of 244 metabolites were identified, including lipids, phenylpropanoids, and benzenoids. Abundance expression showed that ultrafine grinding outperformed spray drying in retaining natural nutritional components. The sample correlation analysis and heatmaps indicated that metabolite expression in spray-dried apple powder had higher uniformity and stability. Univariate statistical analysis revealed that, compared with ultrafine grinding, spray-dried apple powder had 1172 kinds of substances upregulated and 2550 kinds of substances downregulated. Differential metabolite correlation analysis showed that different processing techniques were positively correlated with specific metabolites in apple powder, such as ginsenoside F1 and N-fructosyl pyroglutamate, and negatively correlated with salicylic acid and aspartic acid, among others. KEGG pathway enrichment analysis highlighted the most active pathway as the biosynthesis of unsaturated fatty acids. Conclusion It has been demonstrated that ultrafine grinding is suitable for the production of healthy and special nutritional food products, while spray drying is more appropriate for quick-service foods and the baking industry, laying a theoretical foundation for ensuring food safety and quality control.

Objective To investigate the effects of enzymatic hydrolysis combined with ultrasonication extraction conditions on the yield, antioxidant and hypoglycemic activities of Mori fructus polysaccharides. Methods Using Mori fructus pomace as the raw material and the yield of Mori fructus polysaccharide as the index, the extraction conditions was optimized through single-factor experiments. Then the 1,1-diphenyl-2-picrylhydrazine (DPPH) radical scavenging capacity, 2,2’-azino-bis (3-ethylbenzothiazoline-6-sulfonic acid) diammonium salt (ABTS⁺) radical scavenging capacity, and the inhibitory effects on α-amylase and α-glucosidase activity of hot water extracting polysaccharide (HWP), enzyme-assisted extracting polysaccharide (EWP), ultrasound-assisted extracting polysaccharide (UWP), enzymatic hydrolysis combined with ultrasonication extracting polysaccharide (EUP) were investigated. Results The optimal conditions for polysaccharide extraction by enzymatic hydrolysis combined with ultrasonication was obtained. Mori fructus pomace powder was mixed with water at ratio of 1:80 (g:mL), and 2.0% composite enzyme (cellulase and pectinase at a ratio of 1:1, V:V) was added in the mixture which was maintained at 50 ℃ for 2 h with stirring. Then the mixture was treated by ultrasonication at 400 W and 60 ℃ for 50 min, and the final yield of EUP was 4.81%, increased by 7.6%, 17.5% and 21.6% compared with HWP, EWP and UWP. EUP also exhibited an improvement in the scavenging activity of both ABTS⁺ radical and DPPH radical. Compared with HWP, EWP and UWP, the semi-inhibitory concentration (IC₅₀) of α-amylase activity of EUP was 1.18 mg/mL, reduced by 40.1%, 18.6% and 30.6%, respectively, and the IC₅₀ of α-glucosidase activity of EUP was 0.31 mg/mL, reduced by 16.8%, 8.0% and 39.4%, respectively. Conclusion The enzymatic hydrolysis combined with ultrasonication extraction can not only improve the Mori fructus polysaccharide yield, but also enhance the antioxidant power and hypoglycemic activity of Mori fructus polysaccharide, which has a potential application prospect in the industry.

Objective To analyze the content characteristics of copper (Cu), zinc (Zn), mercury (Hg), lead (Pb), cadmium (Cd) and arsenic (As) in the dorsal and abdominal muscles of wild and farmed Larimichthys crocea, and carry out the food health threat and risk assessment. Methods The content of 6 kinds of heavy metals were determined by inductively coupled plasma mass spectrometry and atomic fluorescence spectrometry in the dorsal and abdominal parts of wild [(35.16±4.62) cm in length and (510.68±33.74) g in weight] and farmed [(32.90±1.11) cm in length and (454.19±20.03) g in weight] Larimichthys crocea. The pollution index method and health risk assessment were used for analysis. Results The average content of Hg, As, Cu and Zn in the dorsal and abdominal of wild and farmed Larimichthys crocea were 0.128, 0.032, 4.179 and 5.526 mg/kg, and 0.023, 0.195, 4.106 and 5.389 mg/kg, respectively. Pb and Cd were not detected. Based on the single heavy metal pollution index, Cu, Zn, Pb, Cd in the dorsal and abdominal of wild and farmed Larimichthys crocea and Hg in the dorsal and abdominal of farmed Larimichthys crocea were pollution-free levels. There was slight pollution of Hg and As in the abdomen part of wild Larimichthys crocea, and mild pollution of Hg in the dorsal of wild Larimichthys crocea. Serious pollution level of As was found in the dorsal and abdominal of the farmed Larimichthys crocea. The comprehensive pollution index value of 6 kinds of heavy metals in the muscle of wild Larimichthys crocea was less than 1, which were pollution-free. And comprehensive pollution index value in the muscle tissue of farmed Larimichthys crocea was between 1.0<PI≤2.0, which were mildly polluted. Conclusion The content of heavy metals in the dorsal and abdominal muscles of wild Larimichthy crocea don’t exceed the detection standard, and the As element in the dorsal and abdominal muscles of farmed Larimichthys crocea exceeds the standard. There is no obvious health risk for the wild and farmed Larimichthys crocea muscles. This study systematically reveals the problem of As enrichment in farmed Larimichthys crocea, and early warning of feed or environmental risks; through the two-dimensional assessment of pollution index and health risk, the safety evaluation model of aquatic products is constructed. The research results have practical guiding significance for improving China’s aquaculture standards and improving the quality and safety supervision level of aquatic products.