World Journal of Food Science and Engineering is an international, peer-reviewed open access journal dedicated to advancing research the field of food science and engineering. The journal provides a rapid publication process to ensure wide dissemination of high-quality articles to scientists, professionals, and interested individuals worldwide. Our goal is to serve as an efficient, reliable, and trusted platform for scholars and readers, publishing cutting-edge research in the field.
Abstract: To explore the effects of pressure, temperature, precooling and use of plastic bags on the preservation effect of mixed fresh-cut fruits and vegetables. In this Paper, apples, strawberries and potatoes are taken as the research objects. After fresh cutting, an appropriate amount of them is mixed, and the near-freezing point is set as -1°C. Seven control groups are set up: group A (normal pressure, normal temperature); Group B (atmospheric pressure, 4°C); Group C (10 kPa, -1°C); Group D (vacuum precooling, 10 kPa, -1°C); Group E (10 kPa, 4°C); Group F (vacuum precooling, 10 kPa, 4°C); Group G (without fresh bag, normal pressure, normal temperature) studied its preservation effect under different storage conditions within 9 days. Through the analysis and comprehensive evaluation of various indicators, the suitable storage and preservation methods of mixed fresh-cut fruits and vegetables are obtained. The results show that the preservation effect is more obvious at the later stage of the storage experiment, the final sensory score is the highest, the weight loss rate is the lowest, and the weight loss rate is reduced by 4.91% compared with the low pressure environment at 4°C. The use of plastic bags have the greatest impact on the weight loss rate and appearance of fruits and vegetables. Using plastic bags can reduce the weight loss by 48.48% on average compared with the same period, and the sensory score increases by 1 to 3 points. In the low pressure and high humidity environment, the weight of apple increases, and the final weight increases by 0.46% to 1.55%. The weight loss rate of strawberry is the highest, which can reach 22.54%. The vacuum pre-cooling process can reduce the weight of fruits and vegetables by 0.76% to 1.15%. When the low-pressure near-ice temperature storage is adopted to avoid the surge of weight loss rate, the average weight loss rate will be reduced by 7.8%.Abstract: To explore the effects of pressure, temperature, precooling and use of plastic bags on the preservation effect of mixed fresh-cut fruits and vegetables. In this Paper, apples, strawberries and potatoes are taken as the research objects. After fresh cutting, an appropriate amount of them is mixed, and the near-freezing point is set as -1°C. Seven co...Learn More
Abstract: Objective: To improve the counting efficiency and realize the traceability of raw data. The applicability, accuracy, precision and repeatability of the automatic colony counter were verified by experiments, Determine the applicability of colony count in the detection of dairy products and raw and auxiliary materials. Methods: The plate pouring method and test piece method are selected for verification test, including psychrophilic bacteria, aerobic spores, thermophilic aerobic spores, lactic acid bacteria count, total number of colonies, coliform, mold, yeast, Staphylococcus aureus and other items. The manual count is compared with the automatic colony counter to determine its feasibility, applicability and accuracy. Results: The colony count of normal Petri dish without background interference was compared with that of 3M test piece. The paired t-test was carried out by visual method and instrument method, P = 0.17, greater than 0.05. There was no significant difference in statistical results, and the colored medium had no significant effect on automatic counting. The counting effect of the instrument is poor when there are needle shaped colonies, the color of colonies is close to that of the culture medium, the contour of colonies is not obvious, the colonies spread greatly and the edges of colonies are irregular, there are food particles and colonies in the culture medium at the same time, or the color of colonies is close to that of food particles, which can not meet the accuracy requirements. Conclusion: For samples with uniform texture, the accuracy and precision of automatic colony counting are relatively good, the work efficiency is high, the operation time of experimental personnel is saved, and the original experimental data and images can be stored in the instrument for a long time. It is a counting method worthy of popularization in the laboratory. However, for the samples and culture medium with interference in the test verification, appropriate measures can be taken to change the counting conditions and manually correct the counting results of the instrument, but the counting efficiency will be reduced, and the laboratory can choose to use it according to the situation.Abstract: Objective: To improve the counting efficiency and realize the traceability of raw data. The applicability, accuracy, precision and repeatability of the automatic colony counter were verified by experiments, Determine the applicability of colony count in the detection of dairy products and raw and auxiliary materials. Methods: The plate pouring meth...Learn More
Abstract: In the field of food safety inspection, researchers should fully consider the impact of measurement uncertainty to ensure the accuracy of the results, Especially when it affects the determination of detection results.This study is to establish the mathematical model of uncertainty, Synthesize and expand each uncertainty component .Finally, the uncertainty evaluation method for the determination of lead in milk and dairy products by atomic absorption spectrometry was established. Take milk powder as an example, the uncertainty of graphite furnace atomic absorption spectrometry method 1 in GB 5009.12-2017 National Food Aafety Standard Determination of Lead in Foods was evaluated by referring to JJF 1059.1-2012 Evaluation and Expression of Measurement Uncertainty. When the standard result of lead content in milk was 0.095 mg/kg, the synthetic standard uncertainty of the determination result was 0.0022 mg/kg, k=2, and the extended uncertainty was 0.005 mg/kg, and the result could be expressed as (0.095±0.005) mg/kg. The uncertainty of measurement results is mainly due to the uncertainty component introduced by test repeatability and standard solution concentration. Therefore, in the actual testing work, the accuracy and reliability of the results can be ensured by increasing the number of standard working fluid, using glass instruments with higher accuracy, and increasing the number of parallel samples.Abstract: In the field of food safety inspection, researchers should fully consider the impact of measurement uncertainty to ensure the accuracy of the results, Especially when it affects the determination of detection results.This study is to establish the mathematical model of uncertainty, Synthesize and expand each uncertainty component .Finally, the unce...Learn More
Abstract: The uncertainty assessment of melamine in frozen drinks by high-performance liquid chromatography, According to the basic methods and procedures stipulated in the Assessment and presentation of Measurement Uncertainties and the Guidelines for the Assessment of Uncertainty in Chemical Analysis, The main sources of influence uncertainty were analyzed, and the assessment method for determining melamine uncertainty in frozen drinks was established. The results show that the results of (0.661 mg/kg ± 0.03, k=2) affect the determination of melamine uncertainty in frozen drinks, Uncertainty introduced by the fitted curve, the standard curve preparation process, the measurement repeatability, the Sample volume, the standard purity, Standard weighing and the sample amount. The model provides a reference for the uncertainty assessment of melamine in frozen drinks According to it, At the same time, in the daily detection and weighing, the measurement activities can be used to control the fitting curve and the standard solution preparation process, in order to reduce the measurement uncertainty, improve the accuracy of the test results, the compliance of the measurement results is important.Abstract: The uncertainty assessment of melamine in frozen drinks by high-performance liquid chromatography, According to the basic methods and procedures stipulated in the Assessment and presentation of Measurement Uncertainties and the Guidelines for the Assessment of Uncertainty in Chemical Analysis, The main sources of influence uncertainty were analyzed...Learn More
Abstract: With the increase of people's attention to nutrition and health, food quality and safety have also become the focus of people's daily attention, among which mercury and its compounds are widely distributed in nature, with high volatility, high toxicity and harmful accumulation. In this paper, the first method of atomic fluorescence spectroscopy in GB5009.17-2021 "National Food Safety Standard - Determination of Total Mercury and Organic Mercury in Food" was comprehensively analyzed in the detection of total mercury in food, and the key points of sample pretreatment, the on-machine detection process and the detection experiment were comprehensively analyzed. The analysis of key points of pretreatment mainly includes: sample weighing, cleaning and use of detection instruments, amount of acid in microwave digestion process, optimization and setting of microwave digestion program, and analysis and research on the elimination method of excess nitric acid after microwave digestion is completed. The analysis of the key parameters of the atomic fluorescence photometer of the detection equipment during the sample testing on the machine includes: the setting and optimization of the instrument parameters, the daily maintenance method of the key components of the instrument, etc.; Through the analysis and study of all aspects of the entire detection process, the main factors affecting the accuracy of the detection results are identified for improvement and solidification implementation, so as to more effectively improve the accuracy of the measurement results.Abstract: With the increase of people's attention to nutrition and health, food quality and safety have also become the focus of people's daily attention, among which mercury and its compounds are widely distributed in nature, with high volatility, high toxicity and harmful accumulation. In this paper, the first method of atomic fluorescence spectroscopy in ...Learn More
