Heavy metals and arsenic concentrations in water, agricultural soil, and rice in Ngan Son district, Bac Kan province, Vietnam最新文献_第3页

The status of microbiological contamination of water using to produce bottled drinking water in Khanh Hoa province in 2022 2022年庆化省瓶装饮用水生产用水的微生物污染状况

Heavy metals and arsenic concentrations in water, agricultural soil, and rice in Ngan Son district, Bac Kan province, Vietnam Pub Date : 2023-03-31 DOI: 10.47866/2615-9252/vjfc.4048

Ngoc Duyen Nguyen Thi, Phong Le Quoc, Thuy Tran Thi, Van Khanh Dao Thi, Hoai Trinh Phan Thi, Hung Do Thai

{"title":"The status of microbiological contamination of water using to produce bottled drinking water in Khanh Hoa province in 2022","authors":"Ngoc Duyen Nguyen Thi, Phong Le Quoc, Thuy Tran Thi, Van Khanh Dao Thi, Hoai Trinh Phan Thi, Hung Do Thai","doi":"10.47866/2615-9252/vjfc.4048","DOIUrl":"https://doi.org/10.47866/2615-9252/vjfc.4048","url":null,"abstract":"Ninety-three samples of source water, used to produce bottled drinking water at bottled drinking water producers in Khanh Hoa province in 2022, were examined for microbiological criteria such as coliform, Escherichia coli, Pseudomonas aeruginosa, and HPC (Heterotrophic Plate Count). Results indicated that 19/93 (20.4%) of samples did not meet the microbiological requirements according to QCVN 01-1:2018/BYT. In which, the percentage of microbiological unsatisfactory well water (42.9%, 6/14) was higher than that of tap water (16.5%, 13/79). The proportion of source water samples of bottled drinking water facilities that did not meet the microbiological requirements in Cam Lam district (83.3%) was higher than those of Cam Ranh (33.3%), Dien Khanh (30%), Ninh Hoa (13.6%), Nha Trang (8%), and Van Ninh (7.7%). Unsatisfactory microbiological criteria included coliform (16.1%), P. aeruginosa (15.1%), and E. coli (1.1%). In addition, there were 8/93 (8.6%) samples with HPC higher than the recommended limit (500 CFU/mL) of the Environmental Protection Agency (EPA). The means of HPC, coliform, and P. aeruginosa were 4,2 × 102, 6,2 × 101, and 1,1 × 102 CFU/100 mL, respectively. Contaminated source water is one of the risks of microbiological contamination in finished bottled drinking water. Therefore, bottled drinking water producers in Khanh Hoa need to maintain good infection control and minimize the risk of microbial contamination from source water to finished bottled drinking water. ","PeriodicalId":12896,"journal":{"name":"Heavy metals and arsenic concentrations in water, agricultural soil, and rice in Ngan Son district, Bac Kan province, Vietnam","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79846527","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}

引用次数: 0

Prevalence of Clostridium perfringens and Clostridium difficile carrying cpa, tcdA toxin genes in raw meat and leafy vegetables 生肉和叶菜中携带cpa、tcdA毒素基因的产气荚膜梭菌和艰难梭菌的流行

Heavy metals and arsenic concentrations in water, agricultural soil, and rice in Ngan Son district, Bac Kan province, Vietnam Pub Date : 2023-03-31 DOI: 10.47866/2615-9252/vjfc.4047

Yen Ta Thi, Hanh Ninh Thi, Hai Ha Vu Thi, Q. Pham Van, T. Nguyen Thanh

引用次数: 0

Effects of the cultivation conditions on antimicrobial activity of Lactiplantibacillus sp. NCL33 isolated from Nem chua 培养条件对中华乳酸菌NCL33抗菌活性的影响

Heavy metals and arsenic concentrations in water, agricultural soil, and rice in Ngan Son district, Bac Kan province, Vietnam Pub Date : 2023-03-24 DOI: 10.47866/2615-9252/vjfc.4069

Mai Dinh Thi Ngoc, Tung Tran Son, Phong Tran Huu, T. Nguyen Thanh, Minh Nguyen Hong

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Determination of 1,3-olein-2-palmitin (OPO) content in infant formula by liquid chromatography coupled mass spectrometry LC-MS/MS 液相色谱-质谱联用LC-MS/MS法测定婴儿配方奶粉中1,3-油酸-2-棕榈素(OPO)含量

Heavy metals and arsenic concentrations in water, agricultural soil, and rice in Ngan Son district, Bac Kan province, Vietnam Pub Date : 2023-01-16 DOI: 10.47866/2615-9252/vjfc.4044

Ly Phung Cong, Tu Vu Ngoc, Hong Ngoc Nguyen Thi

{"title":"Determination of 1,3-olein-2-palmitin (OPO) content in infant formula by liquid chromatography coupled mass spectrometry LC-MS/MS","authors":"Ly Phung Cong, Tu Vu Ngoc, Hong Ngoc Nguyen Thi","doi":"10.47866/2615-9252/vjfc.4044","DOIUrl":"https://doi.org/10.47866/2615-9252/vjfc.4044","url":null,"abstract":"1,3-olein-2-palmitin (OPO - Sn2-palmitate) is a triacylglycerol found in breast milk that helps absorb nutrients in the infant’s intestine. Because of its beneficial effect on the infant's health improvement, OPO has been added by manufacturers to infant and infant formula. OPO content becomes an important criterion for milk quality. Therefore, it is necessary to develop a method to analyze OPO in formula milk products, contributing to assessing the quality of formula products being circulated in the market. In this study, OPO was determined by liquid chromatography-mass spectrometry (LC-MS/MS) using an Agilent Poroshell 120 EC-C18 chromatographic column, with an ESI (+) positive electron spray ionization source and multiple reaction monitoring (MRM) mode. The validity of the method was confirmed according to the guidelines of the Association of Official Analytical Chemists (AOAC). The results showed that the method has good specificity, the linearity range from 3.0 to 300 µg/kg, the detection limit of 1.0 µg/kg, the quantification limit of 3.0 µg/kg; precision and accuracy with relative standard deviation (RSD) less than 12% and recoveries ranging from 89.6 to 112%, meeting AOAC requirements. The method was used to analyze the OPO content in 17 infant formula products in Hanoi. ","PeriodicalId":12896,"journal":{"name":"Heavy metals and arsenic concentrations in water, agricultural soil, and rice in Ngan Son district, Bac Kan province, Vietnam","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83851023","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}

引用次数: 0

Determination of amygdalin in kernels and their products by liquid chromatography-tandem mass spectrometry 液相色谱-串联质谱法测定苦杏仁及其产物中的苦杏仁苷

Heavy metals and arsenic concentrations in water, agricultural soil, and rice in Ngan Son district, Bac Kan province, Vietnam Pub Date : 2023-01-06 DOI: 10.47866/2615-9252/vjfc.4043

Thanh Nguyen Ha, Thanh Tran Trung, Hong Ngoc Nguyen Thi, Khanh Cao Cong, Thanh Ha Pham Thi

{"title":"Determination of amygdalin in kernels and their products by liquid chromatography-tandem mass spectrometry","authors":"Thanh Nguyen Ha, Thanh Tran Trung, Hong Ngoc Nguyen Thi, Khanh Cao Cong, Thanh Ha Pham Thi","doi":"10.47866/2615-9252/vjfc.4043","DOIUrl":"https://doi.org/10.47866/2615-9252/vjfc.4043","url":null,"abstract":"Amygdalin is a cyanogenic glycoside, a natural toxicant in Rosaceae spp. such as almonds, peaches, and apricots, and may appear in products containing them. Amygdalin, after being absorbed into the body, will be hydrolyzed and release hydrocyanic acid, which is capable of causing poisoning in humans. Liquid chromatography-tandem mass spectrometry (LC-MS/MS) with negative mode electrospray ionization and multi-reaction monitoring (MRM) mode was used to develop and validate a method for determining amygdalin on food according to AOAC guidelines. Chloramphenicol was chosen as the internal standard. The mobile phase consists of two channels: channel A (formic acid 0.1%), channel B (acetonitril) and the solid phase is symmetry C18 column (3 mm × 150 mm, 3.5 μm). The method has been validated according to AOAC 2016 guidelines. The limit of detection and limit of quantitation of amygdalin in food was 15 and 50 μg/kg, respectively. The linearity ranges from 1.68 to 33.6 ng/mL. Recovery was from 86.2 to 110.0 %, and the relative standard was from 2.8 to 5.0 %. The validated method is applied to determine amygdalin content in some kernels and their products on Hanoi's market. ","PeriodicalId":12896,"journal":{"name":"Heavy metals and arsenic concentrations in water, agricultural soil, and rice in Ngan Son district, Bac Kan province, Vietnam","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82369970","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}

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Simultaneous determination of some antibiotics with coccidiosis effect in feed by LCMS/MS LCMS/MS同时测定饲料中几种有球虫作用的抗生素

Heavy metals and arsenic concentrations in water, agricultural soil, and rice in Ngan Son district, Bac Kan province, Vietnam Pub Date : 2022-12-27 DOI: 10.47866/2615-9252/vjfc.4041

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Survey on the rate of microbial infection, contaminants of heavy metals and nitrite in bird’s nest form some southerwest provinces 西南部分省份燕窝微生物感染率、重金属和亚硝酸盐污染物调查

Heavy metals and arsenic concentrations in water, agricultural soil, and rice in Ngan Son district, Bac Kan province, Vietnam Pub Date : 2022-11-25 DOI: 10.47866/2615-9252/vjfc.4042

Phong Le Hong, Hoang Bui Huy, Thi Nguyen Thi, Kim Cuc Nguyen Thi, Linh Luu Gia, Hang Bui Thi

{"title":"Survey on the rate of microbial infection, contaminants of heavy metals and nitrite in bird’s nest form some southerwest provinces","authors":"Phong Le Hong, Hoang Bui Huy, Thi Nguyen Thi, Kim Cuc Nguyen Thi, Linh Luu Gia, Hang Bui Thi","doi":"10.47866/2615-9252/vjfc.4042","DOIUrl":"https://doi.org/10.47866/2615-9252/vjfc.4042","url":null,"abstract":"This survey aimed at assessing the level of contamination with some microorganisms, some heavy metals and nitrite in semi-processed and raw bird's nest samples in a number of provinces and cities including Binh Phuoc, Binh Duong, Đong Nai, Binh Thuan, Tay Ninh, Ho Chi Minh, Kien Giang, An Giang, Bac Lieu, Can Tho, Gia Lai, Quang Nam, Quang Ngai, Phu Yen. Test results showed that E. coli, Staphylococcus aureus, Listeria monocytogenes, Bacillus cereus, arsenic, and cadmium were not detected in the collected samples; Salmonella, were detected in 03 semi-processed of total 84 samples, accounting for 3.57%. The mold infection rate accounted for 22.92% (11/48 samples); there were 14 raw bird's nest samples exceeding the permited limit of nitrite content, in 80 tested samples, accounting for 17.50% (14/80 samples); 02 semi-processed samples collected at the processing facility detected lead and mercury content exceeded the permitted limit, accounting for 2.50% (2/80 samples). ","PeriodicalId":12896,"journal":{"name":"Heavy metals and arsenic concentrations in water, agricultural soil, and rice in Ngan Son district, Bac Kan province, Vietnam","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79545742","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}

引用次数: 0

Response surface optimization of enzymatic hydrolysis of germinated brown rice for higher reducing sugar production 发芽糙米酶解提高还原糖产量的响应面优化

Heavy metals and arsenic concentrations in water, agricultural soil, and rice in Ngan Son district, Bac Kan province, Vietnam Pub Date : 2022-10-05 DOI: 10.47866/2615-9252/vjfc.4011

Hoang Vo Minh, Toan Nguyen Duc

{"title":"Response surface optimization of enzymatic hydrolysis of germinated brown rice for higher reducing sugar production","authors":"Hoang Vo Minh, Toan Nguyen Duc","doi":"10.47866/2615-9252/vjfc.4011","DOIUrl":"https://doi.org/10.47866/2615-9252/vjfc.4011","url":null,"abstract":"The hydrolysis of germ rice by the use of α-amylase and glucoamylase enzymes will help increase the reducing sugar content, reduce viscosity, and improve the yield of milk solution compared to the traditional extraction method. The liquefaction experiment was arranged with two factors, which are substrate ratio: α-amylase concentration and α-amylase concentration: different hydrolysis time. The saccharification experiment was carried out based on a multivariate model according to the Central Composite Design method. As a result, a 1 : 2 substrate ratio, 0.5% α-amylase concentration (approx. 11U/g starch) and 50 minutes hydrolysis time were selected as the basis for the next experiment. Analysis of variance in the regression model showed that the quadratic model was significant (p < 0.0001). Lack of fit (p > 0.05) this indicates that the model is suitable for all data. The reliability of the model R2 = 0.993 shows that the built regression model fits the data set 99.3%. CV = 1.19% indicated a better precision and reliability of the experiments carried out. Optimal conditions for hydrolysis of glucoamylase concentration of 0.399% (approx. 119.863U/g starch), temperature of 59.813°C and hydrolysis time of 160.468 minutes gave the highest DE content at 25.245% and higher than the non-enzymatic method (DE = 8.985 ± 0.062). ","PeriodicalId":12896,"journal":{"name":"Heavy metals and arsenic concentrations in water, agricultural soil, and rice in Ngan Son district, Bac Kan province, Vietnam","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81369853","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}

引用次数: 0

Electrochemical detection of Sudan based on Ni/Graphene modified screenprinted carbon electrode 基于Ni/石墨烯改性网印碳电极的苏丹红电化学检测

Heavy metals and arsenic concentrations in water, agricultural soil, and rice in Ngan Son district, Bac Kan province, Vietnam Pub Date : 2022-10-05 DOI: 10.47866/2615-9252/vjfc.3973

Thuy Dung Luong Thi, Tuan Nguyen Anh, Thuc Nguyan Van, Hoan Nguyen Xuan, Viet Nguyen Xuan

{"title":"Electrochemical detection of Sudan based on Ni/Graphene modified screenprinted carbon electrode","authors":"Thuy Dung Luong Thi, Tuan Nguyen Anh, Thuc Nguyan Van, Hoan Nguyen Xuan, Viet Nguyen Xuan","doi":"10.47866/2615-9252/vjfc.3973","DOIUrl":"https://doi.org/10.47866/2615-9252/vjfc.3973","url":null,"abstract":"In the work reported here, the simple and efficient modification of Ni nanoparticles /reduced graphene (rGO) on the surface of the screen-printed carbon electrode (SPCE) was demonstrated. The obtained composited materials were characterized by physicochemical methods such as SEM and electrochemical techniques. The results show that the Ni nanoparticles are uniformly distributed on the surface of the reduced graphene material with the particle size from 10 - 20 nm. The electrochemical properties show that the Ni/rGO/SPCE material exhibits high electron exchange ability in 0.1 M KOH media. In addition, the Ni/rGO composited material modified SPCE to form a Sudan electrochemical sensor. The sensor has high sensitivity (9.13 µA. µM-1.cm-2), wide dynamic range (300 nM - 35,000 nM) and low limit of detection - LOD (171.8 nM (3*σ). The combination of a miniaturized 3-electrode system (12.5 mm x 4 mm x 0.3 mm) with a highly electrochemical activity of Ni/rGO composited material pave the prospect for the creation of a new type of electrical sensor: compact, high sensitivity in the analysis of Sudan I in particular and in the analysis of banned substances in food in general. ","PeriodicalId":12896,"journal":{"name":"Heavy metals and arsenic concentrations in water, agricultural soil, and rice in Ngan Son district, Bac Kan province, Vietnam","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86484429","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}

引用次数: 0

Survey on the level of Listeria monocytogenes infection on gotu kola and fresh gotu kola juice in Nha Trang, Khanh Hoa province 清和省芽庄地区枸杞子及新鲜枸杞子果汁中单核增生李斯特菌感染水平调查

Heavy metals and arsenic concentrations in water, agricultural soil, and rice in Ngan Son district, Bac Kan province, Vietnam Pub Date : 2022-10-04 DOI: 10.47866/2615-9252/vjfc.3971

Thanh Hai Nguyen Thi, Uyen Le Nha, Thuy Pham Thu

{"title":"Survey on the level of Listeria monocytogenes infection on gotu kola and fresh gotu kola juice in Nha Trang, Khanh Hoa province","authors":"Thanh Hai Nguyen Thi, Uyen Le Nha, Thuy Pham Thu","doi":"10.47866/2615-9252/vjfc.3971","DOIUrl":"https://doi.org/10.47866/2615-9252/vjfc.3971","url":null,"abstract":"Gotu kola is often used to make fresh juice without heating. In Nha Trang, gotu kola drinks are usually prepared and refrigerated while being traded. Listeria monocytogenes is a bacterium capable of growing at cold temperatures; whereas the pathogenicity is low, mortality rate can be up to 25 - 30%. Therefore, the assessment of the level of L. monocytogenes contamination on raw gotu kola and in gotu kola juice during cold storage is crucial to ensure food safety and hygiene. This study has shown that the prevalence of L. monocytogenes infection on raw gotu kola cultivated in Nha Trang accounted for 15% of the samples with an average infection density of 24.2 MPN/g, in which gotu kola grown in wastewater field had the highest density of bacteria. Soaking raw vegetables in a solution of potassium permanganate 10 ppm/10 minutes has appeared to reduce the amount of L. monocytogenes by 56%. During the first 6 hours of storage, the amount of L. monocytogenes in gotu kola juice was stable at low level. After 24 hours of storage, the number of bacteria increased tenfold (on gotu kola juice without sugar) and twentyfold (on gotu kola juice with sugar) depending on storage temperature. Noticeably, the addition of sugar in gotu kola juice may have increased the growth of bacteria. Test results of forty-five samples of gotu kola juice sold on the streets of Nha Trang have revealed that the infection rate of L. monocytogenes was 6.67% and the average bacterial density was 5.43 MPN/mL. Thus, consumers need to pay attention to the origin and the manufacturing process of crude materials and should not use this herbal beverage from 6 hours after storage to reduce the possibility of disease caused by L. monocytogenes.","PeriodicalId":12896,"journal":{"name":"Heavy metals and arsenic concentrations in water, agricultural soil, and rice in Ngan Son district, Bac Kan province, Vietnam","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90862937","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}

引用次数: 0