Pub Date : 2023-09-27DOI: 10.47866/2615-9252/vjfc.4123
Quy Vu Thi
Regular use of alcohol and coffee may be harmful to human health. Previous studies showed that students who consumed alcohol may consume coffee as well. We conducted a cross-sectional study with 212 final–year undergraduate students of Hanoi Medical University to describe their knowledge and practice in alcohol and coffee use The results show that over 70% of students had knowledge of alcohol and coffee. Approximately 87% and 41% of students thought that alcohol and coffee are both beneficial and harmful to health, respectively. Regarding the actual practice in the use of alcohol and coffee, 93.4% of students had ever drunk alcohol; while 84.9% of those had ever drunk coffee. The frequency of alcohol and coffee use is mostly less than 4 days per month. We found a high percentage of students had knowledge of alcohol and coffee, and they had been using alcohol and/or coffee, however, they occasionally used those drinks with a monthly frequency. It is necessary to strengthen communication activities about alcohol use and its health effects, especially recommending that alcohol use should be limited to less than 2 units/day in men, below 1 unit/day in women, and no more than 5 days/week [1].
{"title":"Knowledge and practice on the use of alcohol and coffee among final-year undergraduate students of Hanoi Medical University in 2023","authors":"Quy Vu Thi","doi":"10.47866/2615-9252/vjfc.4123","DOIUrl":"https://doi.org/10.47866/2615-9252/vjfc.4123","url":null,"abstract":"Regular use of alcohol and coffee may be harmful to human health. Previous studies showed that students who consumed alcohol may consume coffee as well. We conducted a cross-sectional study with 212 final–year undergraduate students of Hanoi Medical University to describe their knowledge and practice in alcohol and coffee use The results show that over 70% of students had knowledge of alcohol and coffee. Approximately 87% and 41% of students thought that alcohol and coffee are both beneficial and harmful to health, respectively. Regarding the actual practice in the use of alcohol and coffee, 93.4% of students had ever drunk alcohol; while 84.9% of those had ever drunk coffee. The frequency of alcohol and coffee use is mostly less than 4 days per month. We found a high percentage of students had knowledge of alcohol and coffee, and they had been using alcohol and/or coffee, however, they occasionally used those drinks with a monthly frequency. It is necessary to strengthen communication activities about alcohol use and its health effects, especially recommending that alcohol use should be limited to less than 2 units/day in men, below 1 unit/day in women, and no more than 5 days/week [1].","PeriodicalId":498772,"journal":{"name":"Tạp chí Kiểm nghiệm và An toàn thực phẩm","volume":"86 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135586794","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-22DOI: 10.47866/2615-9252/vjfc.4122
Huy Dinh Dang
Currently, there are thousands of plant protection chemicals being allowed for use in agriculture. Abuse or improper use of pesticides lead to increase residues in products, exceeding the maximum residue limit according to the regulations. Therefore, the need for developing methods, which can monitor, detect, and identify many pesticides simultaneously is necessary. The liquid chromatography quadrupole-time-of-flight mass spectrometry (LC-QTOF-MS) method has advantage of being able to simultaneously quantify and screen many compounds at once, are being a trend in analytical techniques for analyzing and screening pesticide residues in foods. In this study, the LC-QTOF-MS method was used to quantify 186 pesticides in fruit and vegetable samples. The limit of detection (LOD) for all compounds is 3.0 µg/kg. The recovery is in the ranged of 74.4 -118%, relative standard deviation (RSD) <20%. At the same time, the method was initial researched for nontarget screening by reprocessing previously acquired data without re-injection of the samples. The list of pesticides can be screening, which are up to 500 chemicals, by comparison results with the available high resolution mass spectral library. The screening detection limit of the method (SDL) is 100 µg/kg. The method has been applied to quantify 186 pesticides, and nontarget screening analyse in 160 fruit and vegetable samples in the first 06 months of 2023.
{"title":"Initial research on the application of the liquid chromatography - quadrupole time-of-flight mass spectrometry (LC-QTOF-MS) method for monitoring pesticide residues in fruits and vegetables","authors":"Huy Dinh Dang","doi":"10.47866/2615-9252/vjfc.4122","DOIUrl":"https://doi.org/10.47866/2615-9252/vjfc.4122","url":null,"abstract":"Currently, there are thousands of plant protection chemicals being allowed for use in&nbsp;agriculture. Abuse or improper use of pesticides lead to increase residues in products,&nbsp;exceeding the maximum residue limit according to the regulations. Therefore, the need for&nbsp;developing methods, which can monitor, detect, and identify many pesticides&nbsp;simultaneously is necessary. The liquid chromatography quadrupole-time-of-flight mass&nbsp;spectrometry (LC-QTOF-MS) method has advantage of being able to simultaneously&nbsp;quantify and screen many compounds at once, are being a trend in analytical techniques for&nbsp;analyzing and screening pesticide residues in foods. In this study, the LC-QTOF-MS method&nbsp;was used to quantify 186 pesticides in fruit and vegetable samples. The limit of detection&nbsp;(LOD) for all compounds is 3.0 &micro;g/kg. The recovery is in the ranged of 74.4 -118%, relative&nbsp;standard deviation (RSD) &lt;20%. At the same time, the method was initial researched for&nbsp;nontarget screening by reprocessing previously acquired data without re-injection of the&nbsp;samples. The list of pesticides can be screening, which are up to 500 chemicals, by&nbsp;comparison results with the available high resolution mass spectral library. The screening&nbsp;detection limit of the method (SDL) is 100 &micro;g/kg. The method has been applied to quantify&nbsp;186 pesticides, and nontarget screening analyse in 160 fruit and vegetable samples in the first 06 months of 2023.","PeriodicalId":498772,"journal":{"name":"Tạp chí Kiểm nghiệm và An toàn thực phẩm","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136100824","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-13DOI: 10.47866/2615-9252/vjfc.4121
Thuy Do Thi Hong
Crocin and crocetin are two bioactive compounds found in saffron and gardenia. In the food industry, due to their natural yellow or orange color, they are used as food colouring. The study was carried out to optimize the high-performance liquid chromatography combined with a photodiode detector (HPLC-PDA) to simultaneously determine the crocin and crocetin content in food. Analytical samples were ultrasonicated with ACN:H2O (1:1, v/v) solvent for 30 minutes. The sample solution was determined by HPLC – PDA with the following conditions: Sunfire C18 column (250 mm x 4.6 mm; 5 µm) mobile phase consisting of 0.1% formic acid and ACN using gradient program. The method has good specificity, the standard curves of crocin and crocetin have correlation coefficients R2 > 0.999, respectively, repeatability and recovery meet AOAC requirements. The limit of detection (LOD) for crocin and crocetin were 0.5 mg/kg and 0.25 mg/kg, respectively. The method has been applied to simultaneously determine crocin and crocetin in 15 real samples and results in 13 out of 15 samples detecting crocin content, 11 out of 15 samples detecting crocetin content, and in 2 out out of 15 samples. neither crocin nor crocetin was detected. The gardenia powder group contained the highest content of crocin and crocetin (23.5 g/100g – 24.4 g/100g) and dried lychee samples - sun-dried or dried gardenia contains the second highest concentrations of crocin and crocetin in the food group.
藏红花素和藏红花素是在藏红花和栀子花中发现的两种生物活性化合物。在食品工业中，由于其天然的黄色或橙色，被用作食品着色剂。本研究优化了高效液相色谱法结合光电二极管检测器(HPLC-PDA)同时测定食品中藏红花素和藏红花素含量的方法。分析样品用ACN:H2O (1:1, v/v)溶剂超声处理30分钟。采用高效液相色谱法测定样品溶液;PDA与以下条件:Sunfire C18柱(250 mm x 4.6 mm;5微米)流动相组成的0.1%甲酸和ACN使用梯度程序。方法特异性好，藏红花素与藏红花素标准曲线的相关系数为R2 >重复性和回收率分别为0.999，符合AOAC要求。检出限(LOD)藏红花素和藏红花素分别为0.5 mg/kg和0.25 mg/kg。应用该方法同时测定了15个实际样品中的藏红花素和藏红花素，15个样品中有13个样品检测到藏红花素含量，15个样品中有11个样品检测到藏红花素含量，15个样品中有2个样品检测到藏红花素含量。藏红花素和藏红花素均未检出。栀子粉组藏红花素和藏红花素含量最高(23.5 g/100g;24.4 g/100g)和晒干的荔枝样品-晒干或晒干的栀子花在食物组中含有第二高的藏红花素和藏红花素浓度。
{"title":"Simultaneous determination of crocin and crocetin in food samples by highperformance liquid chromatography (HPLC-PDA)","authors":"Thuy Do Thi Hong","doi":"10.47866/2615-9252/vjfc.4121","DOIUrl":"https://doi.org/10.47866/2615-9252/vjfc.4121","url":null,"abstract":"Crocin and crocetin are two bioactive compounds found in saffron and gardenia. In the&nbsp;food industry, due to their natural yellow or orange color, they are used as food colouring.&nbsp;The study was carried out to optimize the high-performance liquid chromatography&nbsp;combined with a photodiode detector (HPLC-PDA) to simultaneously determine the crocin&nbsp;and crocetin content in food. Analytical samples were ultrasonicated with ACN:H2O (1:1, v/v) solvent for 30 minutes. The sample solution was determined by HPLC &ndash; PDA with the&nbsp;following conditions: Sunfire C18 column (250 mm x 4.6 mm; 5 &micro;m) mobile phase consisting&nbsp;of 0.1% formic acid and ACN using gradient program. The method has good specificity, the&nbsp;standard curves of crocin and crocetin have correlation coefficients R2 &gt; 0.999, respectively,&nbsp;repeatability and recovery meet AOAC requirements. The limit of detection (LOD) for&nbsp; crocin and crocetin were 0.5 mg/kg and 0.25 mg/kg, respectively. The method has been applied to simultaneously determine crocin and crocetin in 15 real samples and results in 13&nbsp;out of 15 samples detecting crocin content, 11 out of 15 samples detecting crocetin content,&nbsp;and in 2 out out of 15 samples. neither crocin nor crocetin was detected. The gardenia powder&nbsp;group contained the highest content of crocin and crocetin (23.5 g/100g &ndash; 24.4 g/100g) and&nbsp;dried lychee samples - sun-dried or dried gardenia contains the second highest&nbsp;concentrations of crocin and crocetin in the food group.","PeriodicalId":498772,"journal":{"name":"Tạp chí Kiểm nghiệm và An toàn thực phẩm","volume":"90 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135786699","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-08-28DOI: 10.47866/2615-9252/vjfc.4119
Phong Le Quoc
The finished water filling tap is the final contact point of filtered drinking water before bottling. Therefore, microbial contamination at this site may result in cross-contamination into the finished water in the bottle. This study was conducted to evaluate microbiological contamination on the inner surface of the finished water filling tap at the bottled drinking water producers in Khanh Hoa in 2022. A total of 93 swab samples of the inside surface of the tap at 93 producers were subjected to a test for ATP (Adenosine Triphosphate), total plate count (TPC), coliform, Escherichia coli, Pseudomonas aeruginosa, Streptococci feacal, and Clostridia. There were 72/93 (77.4%) samples with ATP values higher than 300 RLU/cm2. The geometric mean of ATP and TPC were 3.1±0.8 log (RLU/cm2) and 3.5±1.2 log (CFU/cm2), respectively. The ATP and TPC were linear correlated, indicating that the surface ATP value inside the finished water filling tap was mainly formed by microorganisms. In addition, 6/93 (6.5%) samples were found to be positive for coliform, including 3 strains of Enterobacter cloacae, 2 strains of Klebsiella pneumoniae and 1 strain of Enterobacter aerogenes. Moreover, 1/93 (1.1%) samples were infected with P. aeruginosa. All 7 strains of these bacteria were biofilm producers under laboratory conditions. Our results demonstrated that the cleaning and decontamination of finished water filling taps were not properly processed, thereby increasing the risk of microbial contamination into finished bottled water.
{"title":"Microbiological contamination of the inner surface of finished water filling taps at bottled drinking water producers in Khanh Hoa province","authors":"Phong Le Quoc","doi":"10.47866/2615-9252/vjfc.4119","DOIUrl":"https://doi.org/10.47866/2615-9252/vjfc.4119","url":null,"abstract":"The finished water filling tap is the final contact point of filtered drinking water before&nbsp;bottling. Therefore, microbial contamination at this site may result in cross-contamination&nbsp;into the finished water in the bottle. This study was conducted to evaluate microbiological&nbsp;contamination on the inner surface of the finished water filling tap at the bottled drinking&nbsp;water producers in Khanh Hoa in 2022. A total of 93 swab samples of the inside surface of&nbsp;the tap at 93 producers were subjected to a test for ATP (Adenosine Triphosphate), total&nbsp;plate count (TPC), coliform, Escherichia coli, Pseudomonas aeruginosa, Streptococci&nbsp;feacal, and Clostridia. There were 72/93 (77.4%) samples with ATP values higher than 300&nbsp;RLU/cm2. The geometric mean of ATP and TPC were 3.1&plusmn;0.8 log (RLU/cm2) and 3.5&plusmn;1.2&nbsp;log (CFU/cm2), respectively. The ATP and TPC were linear correlated, indicating that the&nbsp;surface ATP value inside the finished water filling tap was mainly formed by&nbsp;microorganisms. In addition, 6/93 (6.5%) samples were found to be positive for coliform,&nbsp;including 3 strains of Enterobacter cloacae, 2 strains of Klebsiella pneumoniae and 1 strain&nbsp;of Enterobacter aerogenes. Moreover, 1/93 (1.1%) samples were infected with P.&nbsp;aeruginosa. All 7 strains of these bacteria were biofilm producers under laboratory&nbsp;conditions. Our results demonstrated that the cleaning and decontamination of finished water&nbsp;filling taps were not properly processed, thereby increasing the risk of microbial&nbsp;contamination into finished bottled water.","PeriodicalId":498772,"journal":{"name":"Tạp chí Kiểm nghiệm và An toàn thực phẩm","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135135569","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-08-24DOI: 10.47866/2615-9252/vjfc.4114
Anh Hoang Quoc
Polycyclic aromatic hydrocarbons (PAHs) are a common class of organic pollutants in the environment and are of great research interest because of their high toxicity, including carcinogenicity and mutagenicity. Food is an important source of PAHs exposure in humans, so analysis of PAHs in food is an essential task of food safety testing. This review article gathers information about the analysis methods of PAHs that has been applied in previous studies on food and beverage samples in Vietnam, including steps of extraction, purification of extracts, and quantitative analysis on a chromatographic system. PAHs are extracted from the sample matrix into less polar organic solvents with different techniques such as liquidliquid, liquid-solid, ultrasonic extraction, and pressurized liquid extraction. Interferences in sample extracts can be removed by various techniques: acid and alkali treatment, gel permeation chromatography, solid phase extraction, and dispersive solid phase extraction. PAHs are separated and quantified on gas chromatography-mass spectrometry systems (GCMS, GC-MS/MS, GC×GC-ToFMS) or liquid chromatograph with fluorescence detector (HPLC-FLD). Analytical procedures are all quality controlled by results with blank samples, limits of detection/quantification, recovery standards, and replicate samples. Overall studies to evaluate the content of PAHs in a variety of food samples need to continue to be performed to establish safe consumption thresholds for this group of pollutants in Vietnam.
{"title":"A mini-review on analytical methods for polycyclic aromatic hydrocarbons in Vietnamese food and beverage samples","authors":"Anh Hoang Quoc","doi":"10.47866/2615-9252/vjfc.4114","DOIUrl":"https://doi.org/10.47866/2615-9252/vjfc.4114","url":null,"abstract":"Polycyclic aromatic hydrocarbons (PAHs) are a common class of organic pollutants&nbsp;in the environment and are of great research interest because of their high toxicity, including&nbsp;carcinogenicity and mutagenicity. Food is an important source of PAHs exposure in humans,&nbsp;so analysis of PAHs in food is an essential task of food safety testing. This review article&nbsp;gathers information about the analysis methods of PAHs that has been applied in previous&nbsp;studies on food and beverage samples in Vietnam, including steps of extraction, purification&nbsp;of extracts, and quantitative analysis on a chromatographic system. PAHs are extracted from&nbsp;the sample matrix into less polar organic solvents with different techniques such as liquidliquid, liquid-solid, ultrasonic extraction, and pressurized liquid extraction. Interferences in&nbsp;sample extracts can be removed by various techniques: acid and alkali treatment, gel&nbsp;permeation chromatography, solid phase extraction, and dispersive solid phase extraction.&nbsp;PAHs are separated and quantified on gas chromatography-mass spectrometry systems (GCMS, GC-MS/MS, GC&times;GC-ToFMS) or liquid chromatograph with fluorescence detector&nbsp;(HPLC-FLD). Analytical procedures are all quality controlled by results with blank samples,&nbsp;limits of detection/quantification, recovery standards, and replicate samples. Overall studies&nbsp;to evaluate the content of PAHs in a variety of food samples need to continue to be performed&nbsp;to establish safe consumption thresholds for this group of pollutants in Vietnam.","PeriodicalId":498772,"journal":{"name":"Tạp chí Kiểm nghiệm và An toàn thực phẩm","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135472321","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-08-24DOI: 10.47866/2615-9252/vjfc.4117
Giang Tran Hoang
The inductively coupled plasma mass spectrometry (ICP-MS) method is applied to determine the content of heavy metals (Pb, Cd, As, Hg) in food and animal feed samples at the National Institute for Food Control due to its high accuracy and quick response time. These samples were digested in a microwave using a mixture of nitric acid and hydrogen peroxide, with the yttrium internal standard added initially to control the analysis. The efficiency of the method was evaluated to meet the requirements of AOAC with reasonable specificity, working standard curve for elements in the range from 0.4 to 20 µg/L, the relative standard deviation of repeatability RSDr < 3,55%, and the recoveries (R%) ranged from 92.2 to 103.1%. The method has been validated by participating in international proficiency testing programs in 2021 and 2022 with a value of |z-score| ≤ 2. Therefore, the results affirm the laboratory's competency meets the requirements for the validity of test results ISO/IEC 17025 requirements, reliability for customers and authorities.
{"title":"Determination performance of ICP-MS heavy metals in food and feed test method through participation of proficiency testing programs","authors":"Giang Tran Hoang","doi":"10.47866/2615-9252/vjfc.4117","DOIUrl":"https://doi.org/10.47866/2615-9252/vjfc.4117","url":null,"abstract":"The inductively coupled plasma mass spectrometry (ICP-MS) method is applied to&nbsp;determine the content of heavy metals (Pb, Cd, As, Hg) in food and animal feed samples at&nbsp;the National Institute for Food Control due to its high accuracy and quick response time.&nbsp;These samples were digested in a microwave using a mixture of nitric acid and hydrogen&nbsp;peroxide, with the yttrium internal standard added initially to control the analysis. The&nbsp;efficiency of the method was evaluated to meet the requirements of AOAC with reasonable&nbsp;specificity, working standard curve for elements in the range from 0.4 to 20 &micro;g/L, the relative&nbsp;standard deviation of repeatability RSDr &lt; 3,55%, and the recoveries (R%) ranged from 92.2&nbsp;to 103.1%. The method has been validated by participating in international proficiency&nbsp;testing programs in 2021 and 2022 with a value of |z-score| &le; 2. Therefore, the results affirm&nbsp;the laboratory's competency meets the requirements for the validity of test results ISO/IEC&nbsp;17025 requirements, reliability for customers and authorities.","PeriodicalId":498772,"journal":{"name":"Tạp chí Kiểm nghiệm và An toàn thực phẩm","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135472322","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-07-28DOI: 10.47866/2615-9252/vjfc.4120
Thy Vuong Bao
Food safety affects to physical and mental development of human. This article observed the knowledge, attitude and practice of students on food safety to survey students' knowledge, attitude and practice on food safety. A cross sectional description study was performed on 309 students in Cuu Long university in the Mekong Delta region. SPSS 16.0 was used to analyze the data. The results showed that in term of knowledge of food safety: 68.28% of students had knowledge of food poisoning, 75.73% could detect the risk of food poisoning, 80.58% described the clinical symptoms of food poisoning, and 62.46% knew the World Health Organization's golden rule of food safety. Regarding the knowledge of food preservation: 69.26%-75,73% had knowledge of egg preservation and of processed foods. For knowledge of solving food poisoning: 80.26% had knowledge of solving food poisoning cases. Attitude of food safety: 83.82% knew choosing the place to buy food safely. Practice of food safety: 68.93%-81.55% had good practiced in choosing safe fresh food and processed food.
{"title":"Students' knowledge, attitude, and practice on food safety in Mekong University from July 2022 to December 2022","authors":"Thy Vuong Bao","doi":"10.47866/2615-9252/vjfc.4120","DOIUrl":"https://doi.org/10.47866/2615-9252/vjfc.4120","url":null,"abstract":"Food safety affects to physical and mental development of human. This article&nbsp;observed the knowledge, attitude and practice of students on food safety to survey students'&nbsp;knowledge, attitude and practice on food safety. A cross sectional description study was&nbsp;performed on 309 students in Cuu Long university in the Mekong Delta region. SPSS 16.0&nbsp;was used to analyze the data. The results showed that in term of knowledge of food safety:&nbsp;68.28% of students had knowledge of food poisoning, 75.73% could detect the risk of food&nbsp;poisoning, 80.58% described the clinical symptoms of food poisoning, and 62.46% knew&nbsp;the World Health Organization's golden rule of food safety. Regarding the knowledge of&nbsp;food preservation: 69.26%-75,73% had knowledge of egg preservation and of processed&nbsp;foods. For knowledge of solving food poisoning: 80.26% had knowledge of solving food&nbsp;poisoning cases. Attitude of food safety: 83.82% knew choosing the place to buy food safely.&nbsp;Practice of food safety: 68.93%-81.55% had good practiced in choosing safe fresh food and&nbsp;processed food.","PeriodicalId":498772,"journal":{"name":"Tạp chí Kiểm nghiệm và An toàn thực phẩm","volume":"87 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135607758","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-28DOI: 10.47866/2615-9252/vjfc.4116
Tam Tran Mong To
In recent years, the use of natural herbal remedies in disease treatment in Vietnam has been significantly considered. Research on the chemical composition, microscopic characteristics, and extraction of active components from herbal materials play an important role in medicinal applications. This study aims to describe the microscopic features of fresh Bishopwood leaves using a dual staining method, examine leaf powder under a microscope, determine the components using chemical reactions, and investigate the influence of factors such as ethanol concentration, time, temperature, and the ratio of raw materials to solvents on the process of extracting flavonoids from Bishopwood leaves. Through unique chemical reactions, the components of Bishopwood leaves were identified to include flavonoids, phenolics, tannins, steroids, proteins, carbohydrates, and anthranoids. Microscopic examination of fresh Bishopwood leaves and leaf powder under a microscope revealed characteristic structural components including epidermis, stomata, parenchyma, sclerenchyma, fiber bundles, and vascular bundles. The appropriate conditions for extracting flavonoids from Bishopwood leaves were using 50% ethanol as the extraction solvent, a 3-hour extraction time, a temperature of 60 °C, and a raw material-to-solvent ratio of 1 : 30 (g/mL). The research findings serve as valuable information contributing to the identification, standardization, and development of new drugs from local medicinal materials.
{"title":"Studying microscopic characteristics and examination of the factors effect flavonoid contents extracted from Bishop wood (Bischofia javanica Blume) leaves at Lam Dong province","authors":"Tam Tran Mong To","doi":"10.47866/2615-9252/vjfc.4116","DOIUrl":"https://doi.org/10.47866/2615-9252/vjfc.4116","url":null,"abstract":"In recent years, the use of natural herbal remedies in disease treatment in Vietnam has&nbsp;been significantly considered. Research on the chemical composition, microscopic&nbsp;characteristics, and extraction of active components from herbal materials play an important&nbsp;role in medicinal applications. This study aims to describe the microscopic features of fresh&nbsp;Bishopwood leaves using a dual staining method, examine leaf powder under a microscope,&nbsp;determine the components using chemical reactions, and investigate the influence of factors&nbsp;such as ethanol concentration, time, temperature, and the ratio of raw materials to solvents&nbsp;on the process of extracting flavonoids from Bishopwood leaves. Through unique chemical&nbsp;reactions, the&nbsp;components of Bishopwood leaves were identified to include flavonoids,&nbsp;phenolics, tannins, steroids, proteins, carbohydrates, and anthranoids. Microscopic&nbsp;examination of fresh Bishopwood leaves and leaf powder under a microscope revealed&nbsp;characteristic structural components including epidermis, stomata, parenchyma, sclerenchyma, fiber bundles, and vascular bundles. The appropriate conditions for extracting&nbsp;flavonoids from Bishopwood leaves were using 50% ethanol as the extraction solvent, a 3-hour extraction time, a temperature of 60 &deg;C, and a raw material-to-solvent ratio of 1 : 30&nbsp;(g/mL). The research findings serve as valuable information contributing to the&nbsp;identification, standardization, and development of new drugs from local medicinal&nbsp;materials.","PeriodicalId":498772,"journal":{"name":"Tạp chí Kiểm nghiệm và An toàn thực phẩm","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135359215","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-28DOI: 10.47866/2615-9252/vjfc.4115
Chien Dinh Viet, Anh Huong Nguyen Thi
Benzyldimethyloctylammonium chloride (BAC-C8) and Benzyldimethyldodecyl ammonium chloride (BAC-C12) are bactericidal surfactants which widely used in the pharmaceutical industry as anti-microbial disinfectants in skin antiseptic solution. According to current international regulations, the standard of finished antiseptic solution must have regulations on the limit of preservatives when used in the formulation. In this study, simultaneous determination of BAC-C8 and BAC-C12 was performed by capillary electrophoresis using capacitively coupled contactless conductivity detection (CE-C4D) with analytical conditions including: fused silica capillary (50 µm ID.) with effective length of 40 cm, background electrolyte solution of 100 mM acetic acid (Ace) added 30% acetonitril (ACN); hydrodynamic sample injection at height of 10 cm in 20 s; separation voltage of +15 kV. The detection limit of BAC-C8 and BAC-C12 were 1.5 mg/L and 3.5 mg/L, respectively. This method has been applied to determine the content of BAC-C8 and BACC12 in the disinfectant solution samples.
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