Objective To explore the effects of curcumin and vitamin C supplementation on harmful substances heterocyclic amines (HAAs) and advanced glycation end products advanced glycation end products (AGEs) in Salmon salar roasting process inhibition and the effect of exogenous additives on the flavor of grilled Salmon salar. Methods The concentrations of HAAs and AGEs were determined by high performance liquid chromatography-tandem mass spectrometry, and the inhibitory mechanism of reducing sugar, creatine, creatinine, glyoxal and other precursors and lipid oxidation levels were further determined. The changes of volatile flavor of Salmon salar during baking were analyzed by gas chromatography and ion migration spectrometry. Results Compared with the control group, curcumin and vitamin C showed significant inhibitory effects on HAAs and AGEs (P˂0.05), and the total HAAs inhibition rates were 75.21% and 59.52%, respectively. The inhibition rates of N^ε-carboxymethyl-lysine in AGEs were 90.56% and 90.87%, respectively. The inhibition rates of N^ε-carboxymethl-lysine were 94.57% and 94.80%. The concentrations of precursors such as reducing sugar, creatine, creatinine and glyoxal were highly correlated with the content of HAAs and AGEs. In addition, volatile flavor analysis showed that the addition of curcumin and vitamin C had a certain effect on the flavor of grilled Salmon salar, and increased the concentration of aroma compounds such as 3-hydroxy-2-butanone, 2,6-dimethyl- 7-octene-2-ol and menthol, which contributed to the overall smell of Salmon salar. Conclusion Curcumin and vitamin C affect the key precursors and intermediates in the formation of HAAs and AGEs, and have a significant inhibitory effect. The development of this study provides theoretical guidance for the control of harmful substances in hot processing of fish products, and provides reference for optimizing the processing technology of fish products.

Objective To optimize two kinds of detection methods in GB/T 37514—2019 Animal and vegetable fats and oils-Determination of mineral oils. Methods The saponification time was extended from 5 min to 10 min; a turbidimeter was introduced to measure the turbidity value of the saponified sample solution; a commercially available aluminum foil plate was used instead of the homemade alumina thin-layer plate; and 3 kinds of mineral oils were added to compare with the liquid paraffin in the standard. Results The turbidity values of some edible oils decreased to different degrees after prolonging the saponification time; the lowest limits of detection of diesel and liquid paraffin could reach 0.2% after replacing the aluminum foil plate; the limits of detection of different mineral oils by different methods were all different. Although the sensitivity of the optimized method was improved, it still did not fully meet the ideal standard for the detection of very small amounts of mineral oil residues in food safety regulation. Conclusion We call on the relevant departments to accelerate the improvement of the standardization system for the detection of mineral oil in food, and to promote the establishment of a more sensitive and scientific standard for the detection of mineral oil, so as to ensure the safety and quality of the edible oil market and to safeguard public health.

Objective To compare the detection results of aflatoxin B₁ (AFB₁) content in various matrices such as rice, wheat products, and peanut products using 2 kinds of different pretreatment methods: Fully automated immunomagentic bead purification and immunoaffinity column pretreatment method. Methods After extraction with methanol:water (70:30, V:V), a portion of the extract was purified using the immunoaffinity column method with an AFB₁-specific immunoaffinity column, while another portion of the extract was processed by a fully automated immunomagnetic bead purification system paired with an immunomagnetic bead kit. Finally, both purified extracts were analyzed using high performance liquid chromatography coupled with post-column derivatization for detection. Results The efficacy of the immunomagetic bead purification kit and the column efficiency of the immunoaffinity column were both greater than 95%, which could meet the experimental requirements. Within mass concentration range of 1.00-50.00 ng/mL, the linear correlation coefficient (r) was 0.99993, indicating a good linear relationship. The 3 level spiked recovery experiments were conducted in rice matrix (n=6), and the recovery rates of the 2 kinds of pretreatment methods ranged from 98.2%-106.0%, with a relative standard deviation range of 1.0%-5.0%; single level spiked recovery experiments were conducted in wheat products (n=6), with a recovery rate exceeding 80% and a relative standard deviation of 3.7%-7.2%. Meanwhile, the 2 kinds of methods were used to detected AFB₁ positive peanut products and the quality control sample of corn flour matrix, their results were subjected to t-test, which showed no significant difference. Further, Bland-Altman statistical analysis was carried out on the results obtained from the quality control samples of corn flour matrix after 2 kinds of pretreatment methods were used. The results showed that the 2 kinds of methods could replace each other in the detection of AFB₁ in this matrix. The purification step of the immunoaffinity column method was time-consuming, 20 batches of samples take about 3-4 hours. And could only be manually operated, which generated about 1000 mL waste liquid; while the immunomagetic bead method used a fully automatic magnetic bead purifier, which automatically completed 20 batches of samples in 40 minutes at one time, with almost no waste liquid generated. Conclusion The fully automated immunomagnetic bead purification method and the immunoaffinity column method both can achieve good results in detecting AFB₁ in various matrices. Also, the immunomagnetic bead purification method is more efficient, easy to handle, generates less waste liquid, and the cost can be reduced by about 50%.

Food mycotoxins (aflatoxin, ochratoxin, zearalenone, deoxynivalenol, etc.) are contaminants that pose a serious threat to food safety and public health. With the increasing global demand for food and the complexity of the supply chain, rapid and sensitive detection of contaminants is essential to maintain public health and well-being. In recent years, the rapid development of nanotechnology has provided new ideas for the detection of mycotoxins in food. Among them, quantum dots, as a new type of fluorescent nanomaterials, are favored in the field of biosensing due to their excellent optical properties and high sensitivity. Taking quantum dots as a starting point, this paper briefly reviewed the basic properties, synthesis, modification and functionalization of quantum dots, focused on their application in the detection of food mycotoxins, discussed the advantages and challenges of quantum dots in food mycotoxins detection, with the aim of providing new ideas for food safety detection and on-site real-time detection, and safeguarding food safety and human health.

The microbiota in the gastrointestinal tract of humans and animals exhibite diverse characteristics, with microbial communities residing in different ecological niches displaying distinct spatial differences, often characterize by high host specificity. In addition to the compositional differences observe along the longitudinal axis of the gastrointestinal tract, microbes also form discrete characteristic communities within specific microenvironments. This review explored how the physical environment of the gastrointestinal tract affaceded the spatial formation and maintenance of microbial communities, the role of diet in shaping the spatial distribution of gut microbiota, and the importance of this spatial heterogeneity in maintaining organismal health. Focusing on the spatial heterogeneity of gastrointestinal microbiota enables a more comprehensive understanding of the adaptive strategies and biological functions of microbes in different locations and local environments in the gastrointestinal tract. This approach contributed to a better understanding of the role of the gut microbiota in health and disease, providing new theoretical foundations for maintaining gut health, preventing and treating diseases, and developing personalized medical strategies.

Mycotoxins are secondary metabolites produced by fungi. Food is highly susceptible to fungal contamination, leading to the production of various mycotoxins, which pose significant threats to food safety and human health. Given the diversity of food types and the complexity of their matrices, direct detection of mycotoxins in food is often affected by matrix effects. Therefore, establishing rapid and sensitive detection methods to monitor and control mycotoxin levels in food is of great importance. Covalent organic frameworks (COFs) are a type of porous organic material characterized by their large specific surface area, excellent stability, adjustable pore size and ease of functionalization, making them superior adsorbent materials. In recent years, COFs have become a popular material in the research of mycotoxin detection. This article categorized the synthesis methods of COFs materials and reviewed their research progress in the field of mycotoxin detection, aiming to provide a reference for the application of covalent organic framework materials in mycotoxin detection research.

Objective To investigate the pollution of 5 kinds of heavy metals in 4 types of food in Hubei Province from 2022 to 2023, and to assess the health risks caused by heavy metal intake in the population. Methods From 2022 to 2023, a total of 316 samples of 4 types 6 kinds of food (soybean, peanut, mushroom, dictyophora, rice and wheat) were randomly collected in Hubei Province. The content of 5 kinds of heavy metals were detected by inductively coupled plasma-mass spectrometry (ICP-MS), and the contamination of food was analyzed by single factor pollution index (P_i) and comprehensive factor pollution index (P_M). According to the health risk assessment model recommended by U.S. Environmental Protection Agency, the target hazard quotient (THQ) and target cancer risk assessment (TCR) were used to assess the non-carcinogenic and carcinogenic health risks caused by heavy metal exposure in the population. Results The overall qualified rate of food was close to 95%, the detection rate of Cd in heavy metals was the highest (100.0%, 14.2%). There were statistically significant differences in the detection rate and excess rate of the 5 kinds of heavy metals (χ²=179.320, 21.849, P<0.001). The 6 kinds of food contamination levels were dictyophora(severe), shiitake mushroom (mild), soybean (safe), peanut (safe), rice (safe), and wheat (safe). The individual heavy metal THQ of different regions and different genders was less than 1, but the comprehensive heavy metal THQ was greater than 1, and the carcinogenic risk of heavy metal in different regions and different genders was greater than 10^-4. In Hubei, the non-carcinogenic and carcinogenic health risks caused by dietary heavy metals intake were higher in rural areas than in urban areas, and higher in women than in men. Non-carcinogenic health risks mainly come from Cd and Cr, while carcinogenic health risks mainly come from Cr. Conclusion There is a certain degree of contamination of edible fungi in the four types of food sold in Hubei Province from 2022 to 2023, especially the heavy pollution of dictyophora. The non-carcinogenic health risk caused by the intake of heavy metals through dietary means is high, and the carcinogenic risk is within the acceptable range. Relevant departments should strengthen supervision and pay attention to the health risks of Cd and Cr exposure.

Objective To study the accuracy and feasibility of colloidal gold immunochromatography for the detection of animal-derived components in meat products. Methods The rapid detection kit was used to detect the animal-derived components in meat products. The sensitivity, specificity, adulteration simulation, false positive rate and false negative rate of 8 kinds of animal-derived components were tested, and quantitative real-time polymerase chain reaction (QPCR) was used as a reference. Results The limits of detection of the rapid detection kit could reach 0.1% for cattle, chicken, duck and goose, and 0.01% for pig, sheep, horse and donkey. The limits of detection of pig, cattle, sheep, chicken, duck, goose, horse and donkey in the adulterated simulation could reach 0.5%, and there was no cross-reaction with other non-species channel detection, and the specificity was good. Conclusion The colloidal gold immunochromatography method established in this study is suitable for the rapid screening and detection of animal origin in meat products.

Objective To establish a method for the simultaneous determination of 10 kinds of phytotoxins, including tripterygium wilfordii and aconite in honey by ultra performance liquid chromatography-tandem mass spectrometry. Methods The samples were extracted by vortexing with 1% formic acid water-70% acetonitrile water solution. After high-speed centrifuged, added appropriate amount of primary secondary amine (PSA) to the supernatant, and shaked and mixed evenly, passed through 0.22 μm filter membrane, then determined and analyzed by the instrument. The matrix working curve was used for quantification by the external standard method. Results The limits of detection of 10 kinds of phytotoxins were 0.03-1.90 μg/kg. The 10 kinds of phytotoxins showed good linearity in a certain range of mass concentration with the correlation coefficients were all greater than 0.999. The average recovery rates of toxins ranged from 89.5% to 113.8% at 3 kinds of different concentration spiked levels, and the relative standard deviations of 0.5%-8.7%. Conclusion The method is convenient, sensitive and accurate, and provides technical support for rapid screening of phytotoxins in emergencies. It is suitable for simultaneous determination of various phytotoxins in honey samples, especially in batch samples.

Objective To investigate the effects of low-temperature plasma-activated water (PAW) with varying treatment durations (5, 10, 15 minutes) on the quality of cold fresh Siniperca chuatsi slices. Methods This article used 0.15% lactic acid solution as the sterilization medium to soak cold fresh Siniperca chuatsi slices in PAW for 5, 10 and 15 minutes. The untreated samples served as the control group, refrigerated at 4 ℃. The pH, total bacterial count, total volatile base nitrogen (TVB-N), cooking loss, texture and sensory quality of the sample were measured every 2 days to evaluate the preservation effect of PAW. Results The results showed that after PAW treatment, the total bacterial count and TVB-N value of the sample were significantly inhibited, the pH decreased, the texture characteristics were maintained well, and the sensory quality of the sample were improved. PAW treatment could lead to an increase in cooking loss rate, and increase chewing ability of cold fresh Siniperca chuatsi slices. Conclusion The 15 minutes treatment group has the best preservation effect on cold fresh Siniperca chuatsi slices, maintaining good storage quality and prolonging the shelf life of cold fresh Siniperca chuatsi slices by 4 days.