A validated potentiometric method for the rapid determination of chromium ions content in food samples using a portable graphite sensor

2021 ◽  
pp. 130324
Author(s):  
Marwa El Badry Mohamed ◽  
Eman Yossri Frag ◽  
Heba A. Marzouk
Keyword(s):  
Rapid Determination ◽  
Food Samples ◽  
Potentiometric Method ◽  
Chromium Ions

scholarly journals Rapid determination of actinides in emergency food samples

2011 ◽  
Vol 292 (1) ◽  
pp. 339-347 ◽  
Author(s):  
Sherrod L. Maxwell ◽  
Brian K. Culligan ◽  
Angel Kelsey-Wall ◽  
Patrick J. Shaw
Keyword(s):  
Rapid Determination ◽  
Food Samples

Threshold Radioactivity for Bulk Food Samples by Gamma Spectroscopy

1965 ◽  
Vol 48 (1) ◽  
pp. 1-5
Author(s):  
Harry M Yakabe ◽  
Hiram Neilson
Keyword(s):  
Gamma Ray ◽  
Gamma Spectroscopy ◽  
Rapid Determination ◽  
Detection System ◽  
Fission Products ◽  
Food Samples ◽  
Family Of Curves ◽  
Lower Limits ◽  
True Activity

Abstract In the surveillance of bulk food produce by gamma ray spectroscopy for fission products, the activities of the commonly observed radionuclides are frequently in the magnitude of background inherent to the detection system. The problems of determining whether the sample is in fact contaminated, the lower limits of detecting the radionuclides, and the effect of compton smear on the lower limits are discussed. The discussions are based on the modified spectrum stripping method for quantitative analysis of gamma ray spectrum for the following radioisotopes: Cs-137, Zr-95/Nb-95, and K-40. A family of curves are shown for rapid determination of the minimum detectable true activity (AII) of Cs-137.

First report on a BODIPY-based fluorescent probe for sensitive detection of oxytetracycline: application for the rapid determination of oxytetracycline in milk, honey and pork

RSC Advances ◽  
2016 ◽  
Vol 6 (92) ◽  
pp. 89288-89297 ◽  
Author(s):  
Zhiqun Xu ◽  
Xiaofeng Yi ◽  
Qiao Wu ◽  
Yincan Zhu ◽  
Minrui Ou ◽  
...  
Keyword(s):  
Fluorescent Probe ◽  
Rapid Determination ◽  
Food Samples ◽  
Sensitive Detection ◽  
Effective Solution ◽  
First Report

An effective solution for oxytetracycline detection in actual food samples by a novel BODIPY-based fluorescent probe.

scholarly journals Rapid Determination of Listeria monocytogenes by Automated Enzyme-Linked Immunoassay and Nonradioactive DNA Probe

2000 ◽  
Vol 83 (1) ◽  
pp. 86-88 ◽  
Author(s):  
Khalil F Kerdahi ◽  
Philip F Istafanos
Keyword(s):  
Listeria Monocytogenes ◽  
Rapid Determination ◽  
Food Samples ◽  
Dna Probe ◽  
Negative Results ◽  
Smoked Salmon ◽  
Colony Forming Units ◽  
Low Levels ◽  
Analytical Time

Abstract A rapid and reliable analytical method was developed to detect and confirm the presence of Listeria monocytogenes in raw and partially processed foods. Forty-nine food samples (25 mixed cut vegetable salad, 12 smoked salmon, and 12 sterile smoked salmon) were individually inoculated with high levels [10–100 colony forming units (cfu)/25 g sample] and low levels (1–10 cfu/25 g sample) of L. monocytogenes, and were screened using the Vitek Immuno Diagnostic Assay (VIDAS) Listeria monocytogenes (VIDAS LMO)]. Positive test results were confirmed as L. monocytogenes by nonradioactive DNA probe. All samples inoculated with high levels of L. monocytogenes were detected by VIDAS and 96% were confirmed as L. monocytogenes by DNA probe. VIDAS LMO detected 89% of samples inoculated with low levels of L. monocytogenes, and 87% of these were confirmed as positive by DNA probe. In addition, 12 other samples (4 from each of mixed cut vegetable salad, smoked salmon, and sterile smoked salmon) were inoculated with high levels of L. ivanovii, L. seeligeri, L. welshimeri, L. innocua, L. grayi, and L. murrayi. Samples were assayed by the same protocol and all gave negative results. Compared with the cultural method, the VIDAS LMO nonradioactive DNA probe combination is highly specific, discriminates between L. monocytogenes and all other Listeria species, and reduces analytical time.

Rapid Determination of Fumonisin B1 in Food Samples by a Clean-Up Tandem Immunoassay Column

2012 ◽  
Vol 488-489 ◽  
pp. 1568-1573 ◽  
Author(s):  
Yan Wang ◽  
Guang He Wu ◽  
Wei Sheng ◽  
Yan Zhang ◽  
Meng Yuan ◽  
...  
Keyword(s):  
Limit Of Detection ◽  
Rapid Determination ◽  
Enzymatic Reaction ◽  
Simultaneous Detection ◽  
Fumonisin B1 ◽  
Food Samples ◽  
Promising Tool ◽  
Pre Treatment ◽  
Treatment Procedures

An immunochemistry-based assay for non-instrumental simultaneous detection of fumonisins in food was developed. The method was based upon the direct competitive immuno-reaction and the horse radish peroxidase enzymatic reaction. The assay was developed to show a visual detection result, according to a yes/no response to the LOD of fumonisins. The limit of detection (LOD) was 40 μg L-1. The assay could be accomplished within 15 min in all and 4 min for chromogenic substrate application. The fumonisin contaminations in different kinds of food were analyzed by the proposed method and the results were confirmed by ELISA. Avoiding time-consuming reaction steps and complicated pre-treatment procedures, this assay was demonstrated as a promising tool for on-site sample detections.

Method Validation and Rapid Determination of Monosodium Glutamate in Various Food Products by HPLC–Fluorescence Detection and Method Optimization of HPLC–Evaporative Light Scattering Detection Approach without Derivatization

2021 ◽  
Author(s):  
Murat Soyseven ◽  
Göksel Arli
Keyword(s):  
Light Scattering ◽  
High Performance ◽  
Rapid Determination ◽  
Monosodium Glutamate ◽  
Food Samples ◽  
Fluorescence Detector ◽  
Column Temperature ◽  
Light Scattering Detection ◽  
Detection Approach

Abstract In this study, an effective, simple and rapid high-performance liquid chromatography (HPLC) using fluorescence (FLD) method was developed and validated for the determination of monosodium glutamate (MSG) in 57 various food samples. Besides, HPLC-Evaporate Light Scattering Detection (ELSD) method was carried out for determination of MSG without derivatization. MSG analysis was performed by derivatization with dansyl chloride at excitation 328, emission 530nm with fluorescence detector. HPLC-FLD method was carried out by using C18 (150 mm, 4.6 mm, 2.7 μm) column with the mobile phase consisting of (Water: Methanol:Glacial Acetic Acid)/(54:45:1,v/v/v). The column temperature was set at 25°C and the flow rate was set at 0.5 mL min−1 with an injection volume 20 μL. The results were linear (R2 = 0.9999) with very low quantification limits. The applied method was optimized and the validated parameters such as LOD, LOQ, accuracy, precision, linearity and robustness were calculated. The obtained results were statistically compared with each other. The validated HPLC-FLD method was successfully applied for the analysis of MSG in all of the food samples. Moreover, HPLC-ELSD method was optimized and successfully demonstrated for detect the MSG without derivatization.

scholarly journals Miniaturized Fluorimetric Method for Quantification of Zinc in Dry Dog Food

2020 ◽  
Vol 2020 ◽  
pp. 1-6
Author(s):  
Rute C. Martins ◽  
Ana M. Pereira ◽  
Elisabete Matos ◽  
Luisa Barreiros ◽  
António J. M. Fonseca ◽  
...  
Keyword(s):  
Limit Of Detection ◽  
Rapid Determination ◽  
Low Cost ◽  
Food Samples ◽  
Dog Food ◽  
Fluorimetric Assay ◽  
Relative Standard ◽  
The Stability ◽  
Cost Determination

Zinc is an essential trace element for animals in several biological processes, particularly in energy production, and it is acquired from food ingestion. In this context, a microplate-based fluorimetric assay was developed for simple, fast, and low-cost determination of zinc in pet food using 2,2′-((4-(2,7-difluoro-3,6-dihydroxy-4aH-xanthen-9-yl)-3-methoxyphenyl)azanediyl)diacetic acid (FluoZin-1) as fluorescent probe. Several aspects were studied, namely, the stability of the fluorescent product over time, the FluoZin-1 concentration, and the pH of reaction media. The developed methodology provided a limit of detection of 1 μg L−1 in sample acid digests, with a working range of 10 to 200 μg L−1, corresponding to 100–2000 mg of Zn per kg of dry dog food samples. Intraday repeatability and interday repeatability were assessed, with relative standard deviation values < 3.4% (100 μg L−1) and <11.7% (10 μg L−1). Sample analysis indicated that the proposed fluorimetric assay provided results consistent with ICP-MS analysis. These results demonstrated that the developed assay can be used for rapid determination of zinc in dry dog food.

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