Objective To establish an efficient method for assessing the authenticity of Citrus reticulata Blanco honey. Methods High performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS) was utilized for the qualitative and quantitative analysis of plant compounds present in Citrus reticulata Blanco honey. The authenticity of commercially available Citrus reticulata Blanco honey was evaluated by integrating characteristic components with HPLC fingerprints. Results A total of 6 kinds of components were identified in Citrus reticulata Blanco honey, namely caffeine, cis,trans-abscisic acid, 5-methoxybrevosin, pinocembrin, kaempferol and chrysin. Caffeine exhibited a relatively high concentration, with an average content of 9.45 mg/kg. Thus, it was regarded as a characteristic component of Citrus reticulata Blanco honey. The authenticity assessment of 6 kinds of Citrus reticulata Blanco honeys available on the market revealed that 4 brands exhibited superior quality, one brand might be adulterated with other components, and one brand could potentially be counterfeit Citrus reticulata Blanco honey. Conclusion This study presents a novel methodology that synergistically combines characteristic component profiling with HPLC-fingerprinting technology for authenticity assessment of Citrus reticulata Blanco honey. This study provides a theoretical foundation for grading Citrus reticulata Blanco honey and enhancing its added value.

Benzotriazole ultraviolet absorbers (BUVs) are a new class of persistent organic pollutants, which are widely used as light stabilizers in various industrial products with good ultraviolet absorbing ability and thermal stability, among which 2-(2H-benzotriazol-2-yl)-4,6-di-tert-pentylphenol (UV-328) has been listed in the Stockholm Convention. Currently, there are a large number of domestic and international studies on the exposure of BUVs in the environment and living organisms, and the concentration of BUVs in sediments and soils generally reaches hundreds of ng/g, and they are frequently detected in water bodies and fish. Humans have an exposure risk through dietary intake and respiratory tract intake, but there are few reports on the load of BUVs in human urine and blood, and it is noteworthy that the load of BUVs in human breast milk can reach up to thousands of ng/g. In view of the bioaccumulation and potential toxicity of BUVs, this paper provided a detailed overview of the exposure to BUVs in various types of environmental, biological, and human tissue samples. This paper briefly summarized the potential hazards of BUVs, such as liver and kidney target organ toxicity, endocrine disrupting effects, and immunotoxicity and neurotoxicity, aiming to provide a reference for the assessment of the health risk of BUVs in human beings.

Objective To investigate the epidemiological characteristics and drug resistance of foodborne disease cases and pathogens in Jinshan District of Shanghai. Methods The case information of foodborne diseases in 15 sentinel medical institutions in Jinshan District was monitored in 2023, and the positive bacteria in the stool samples of patients were rechecked, identified, and tested for drug sensitivity. Results In 2023, a total of 408 cases of foodborne diseases were reported in Jinshan District, the male to female ratio was 5:4, most of them were 18-34 years old, the occupation was mainly workers, migrant workers and farmers, and the incidence was high from May to September. Except for multiple and mixed foods, vegetables and fruits accounted for a relatively high proportion in suspicious exposed foods. The detection rate of pathogenic bacteria was 21.46% (47/219), diarrheagenic Escherichia coli was the main pathogen, and norovirus was 18.72% (41/219). The results of drug sensitivity showed that the proportion of multi-drug resistant strains in Salmonella was 83.33% (10/12). Conclusion In the 2023 foodborne disease surveillance in Jinshan District, norovirus and diarrheagenic Escherichia coli are the main pathogenic agents. Among the pathogenic bacteria, both Salmonella and diarrheagenic Escherichia coli shows varying degrees of drug resistance. It is necessary to continue strengthening the monitoring of foodborne diseases. Meanwhile, relevant departments shall enhance public awareness of antibiotic resistance, and strengthen the management, rational use and sensitivity testing of various antibiotics.

Objective To provide a theoretical basis and beneficial reference for the formulation of the local specialty characteristic dairy mooncake standard and the product development of the production and processing enterprises. Methods Dairy mooncakes from Xilingol League, Inner Mongolia was used as experimental samples, the sensory, nutritional, quality, and microbiological characteristics using national food safety standards were analyzed. Results Dairy mooncake samples had a strong milky aroma and high protein content. The results showed that the sensory organs, protein, moisture, sodium, peroxide value, acid value, benzoic acid, sorbic acid, saccharin sodium, lead, total bacterial count, coliform bacteria, mold, Staphylococcus aureus and Salmonella levels in the dairy mooncake samples all met the national limits set by national safety standards. Conclusion The above-mentioned indexes indicate that the local specialty dairy mooncakes exhibit good quality and safety throughout production, processing, storage and distribution. The Xilingol milk-based mooncakes are an innovative combination of dairy products and pastries, which not only broadens the variety of local specialty dairy products but also expands the fusion of milk and flour flavors. More importantly, the Xilingol milk-based mooncakes fill the GB/T 19855—2023 General rules for mooncake quality for “Mongolian-style” milk-based mooncakes with high protein content.

Objective To analyze the overall situation of national food safety supervision and sampling inspection from 2021 to 2023 and the main food safety issues. Methods The food safety supervision and sampling inspection data of the national market regulation departments from 2021 to 2023 were summarized, and the categories of food, unqualified project categories, as well as specific unqualified project were analyzed. Results In the past 3 years from 2021 to 2023, market regulation departments at all levels in China had completed a total of 34 food categories and over 20 million batches of supervision and sampling inspection, with an overall unqualified rate of 2.76%. From the sampling batches, the sampling batches for edible agricultural products and catering food were relatively high, accounting for a total of 51.50%. From the unqualified rate, catering food had the highest unqualified rate of 7.20%, mainly due to the high unqualified rate of catering utensils. The unqualified rate of edible agricultural products (3.44%), vegetable products (3.10%), roasted seeds and nuts products (2.72%) was also relatively high. The analysis results of unqualified project categories showed that in recent years, the main problems had been excessive pesticide residues, microbial contamination, and excessive use of food additives, with a total of 64.78% of unqualified samples. Pesticide residues were mainly found in edible agricultural products such as cowpeas, chives, and celery, etc. The main unqualified projects were imidacloprid, fungicide, chlorpyrifos, etc. The main food categories involved in microbial contamination were instant foods, aquatic products, pastries, fruit products, etc. The main unqualified projects were the total number of colonies, molds, and coliforms. The main food categories with the excessive use of food additives were fruit products, catering food, grain processing products, and seasonings. The main unqualified projects were pigments, aluminum containing additives, preservatives, and seasonings exceed the standard. Conclusion The state should continue to pay attention to key categories in food safety sampling, such as edible agricultural products, catering food, vegetable products, roasted seeds and nuts products, as well as issues such as excessive residues of pesticides and veterinary drugs, microbial contamination, and excessive use of food additives in key projects. The country not only needs to increase sampling efforts, but also strengthens supervision of various links such as production and sales, and strives to ensure food safety.

Objective To establish a simple and efficient method for the determination of 6 kinds of eugenols in infant formula milk powder by gas chromatography-mass spectrometry. Methods After ultrasonic extraction with acetonitrile, the sample was purified and degreased using acetonitrile saturated n-hexane. The n-hexane was discarded, and acetonitrile was extracted and concentrated to a volume of 1 mL. DB-1701 chromatographic column was used to separate without splitting the sample, with an injection volume of 1 μL. Ion monitoring mode for gas chromatography-mass spectrometry determination and external standard method for quantification was used. Results The 6 kinds of eugenols showed a good linear relationship within the range of 20-500 ng/mL, the limit of detection of the 6 kinds of eugenol compounds in this method was 0.007 mg/kg, and the limit of quantitation was 0.02 mg/kg. In 2 matrix samples of milk powder and sheep milk powder, the average recoveries of 6 kinds of eugenols at 3 different concentration levels were between 97.3% and 105.0%, the relative standard deviation (RSD) was between 0.3% and 3.7%. Conclusion The pretreatment operation of this method is simple and fast, and the detection method has high sensitivity and good stability, meeting the requirements of national standards, in order to provide reference basis for establishing national standards or methods for the detection of 6 kinds of eugenols in infant formula milk powder.

Objective To establish a method for the determination of 2-hexylpyridine content in the milk and dairy product by high performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS). Methods The sample was extracted by acetonitrile vortex extraction, and the analytical solution was purified by QuEChERS dSPE EMR Lipid degreasing tube. After centrifugation, it was tested on a membrane machine. The acetonitrile primary water as the mobile phase was used, the flow rate was set at 0.25 mL/min, the gradient elution procedure was applied, the GL Sciences InertSustain C₁₈ chromatographic column was used for separation, the electro spray positive ion (ESI⁺) mode, the multiple reaction monitoring (MRM) mode was used for detection, and the matrix matching external standard method was used for quantification. Results The methodological validation indicators were well that the calibration curves were linear in the range of 0.5-20.0 ng/mL with the correlation coefficients (r²) larger than 0.998. The average recoveries of 2-hexylpyridine were 94.45%-109.63% and the relative standard deviations were 3.93%-9.53% at 0.005, 0.010 and 0.050 mg/kg with 3 kinds of spiked levels. Conclusion The accuracy, precision, and sensitivity of the method meet the requirements for residue detection.

Objective To investigate the solvent effect differences in the extraction of substances from flower discs of Helianthus annuus L. using non-targeted metabolomics technology, and to explore the impact of different solvent extraction methods on the metabolic composition of flower disc of Helianthus annuus L.. Methods Liquid chromatography-mass spectrometer (LC-MS) combined with non-targeted metabolomics was utilized to preprocess and statistically analyze the data. Results The study revealed that lipids and lipid-like molecules constituted the largest proportion of metabolites (21.5%), followed by shikimate and phenylpropanoid metabolites (13.4%), and organic heterocyclic compound metabolites (11.1%). Further identification led to the discovery of 8407 kinds of up-regulated and 1054 kinds of down-regulated metabolites, highlighting significant differences in metabolite composition resulting from various extraction methods. The main differential metabolites between the 2 kinds of solvent extraction methods encompassed lipids, shikimate and phenylpropanoids, terpenoids, etc., involving 96 metabolic pathways, with 20 pathways exhibiting significant differences. Based on fold change (FC), using criteria of log₂(FC)>0.6 or -0.2<log₂(FC)<0, and P<0.05 to screen for significantly differential metabolites between alcohol and water extracts, only 11 substances had a log₂(FC) value less than 1, indicating that alcohol extraction significantly increased the content of bioactive components extracted from the flower disc of Helianthus annuus L.. Conclusion The research method is simple and reliable, confirming the importance of non-targeted metabolomics analysis in studying solvent effect differences in flower disc of Helianthus annuus L.. It provides a novel approach for the analysis of flower disc of Helianthus annuus L. products and offers theoretical support for the subsequent development of health foods and pharmaceuticals.

Objective To establish a method for rapid determination of chromium content in aluminum food packaging based on fiber laser induced breakdown spectroscopy. Methods The sensitivity and limit of detection of laser induced breakdown spectroscopy and flame atomic absorption spectrometry optimized by laser pulse width, energy and baseline were evaluated with reference materials, and the 2 kinds of techniques were applied to the detection of aluminum food packaging samples, and the corresponding results were compared. Results For fiber laser induced breakdown spectroscopy, the time consumption was 2 min, the limit of detection was 5.2 μg/g, and the detected Cr content of coca cola packaging, aluminum foil paper and aluminum box were 45, 22, 21 μg/g, respectively. For flame atomic absorption spectrometry, the time consumption was 4 h, limit of detection was 7.2 μg/g, and the detected Cr content of these 3 samples were 136, 16, 14 μg/g, respectively. Conclusion This method is superior to the conventional flame atomic absorption spectrometry method in terms of analyzing speed, limit of detection and cost, and its detection results of commercial samples are similar to those of flame atomic absorption spectrometry, which proves the reliability of this method and its potential applicability in analysis tasks of limited time and large sample quantity.

Objective To establish a method for rapid determination of 58 kinds of pesticide residues in animal derived foods by QuEChERS-gas chromatography-tandem mass spectrometry (GC-MS/MS). Methods After dissolving the oil and fat in n-hexane, the sample was subjected to ultrasonic extraction with a saturated acetonitrile solution (containing 1% glacial acetic acid). The extract was purified with anhydrous magnesium sulfate, octadecyl bonded silica gel (C₁₈), and N-propylethylenediamine (PSA), and then nitrogen was blown to near dryness in a water bath. An internal standard was added and dissolved in ethyl acetate. GC-MS/MS was used for determination, and the blank matrix matching standard curve internal standard method was used for quantification. Results The linear relationship between 58 kinds of pesticides was good within the mass concentration range of 0.005-0.500 mg/L, with correlation coefficients (r²) greater than 0.9945. The limits of detection and limits of quantification were 0.001-0.005 mg/kg and 0.002-0.015 mg/kg, respectively. The average recovery rates of pork, chicken, fish, eggs and milk matrices at 3 different spiked levels ranged from 71.8% to 117.4%, with relative standard deviations of 0.7% to 8.7% (n=4). Conclusion This method has high sensitivity and good accuracy, and is suitable for simultaneous determination of 58 kinds of pesticide residues in animal derived foods.