Direct Determination of Thermophysical Parameter Kρc in Mayonnaise, Shortening, and Edible Oil

1992 ◽  
Vol 46 (4) ◽  
pp. 602-605 ◽  
Author(s):  
Dane Bicanic ◽  
Mihai Chirtoc ◽  
Dorin Dadârlat ◽  
Pieter Van Bovenkamp ◽  
Heidi Van Schayk
Keyword(s):  
Direct Determination ◽  
Thermal Characterization ◽  
Food Products ◽  
Food Samples ◽  
Edible Oil ◽  
Thermophysical Parameter ◽  
Novel Variant ◽  
And Storage

Inverse photopyroelectric (IPPE) spectroscopy, a novel variant among the photothermal spectroscopies, has been used for direct determination of ( Kρc)½ in a variety of food samples. The method appears capable of thermal characterization, and when combined with more mature techniques may prove useful in food products industry and storage.

Determination of Trichlorfon in Technical and Powder Formulations

1988 ◽  
Vol 71 (2) ◽  
pp. 317-320
Author(s):  
Stephen C Slahck
Keyword(s):  
Quality Control ◽  
Liquid Chromatography ◽  
Storage Stability ◽  
Direct Determination ◽  
Ion Pairing ◽  
Uv Detection ◽  
Powder Formulation ◽  
Technical Material ◽  
And Storage

Abstract A facile procedure is described for the determination of trichlorfon in technical material and an 80% powder formulation by using liquid chromatography with ion-pairing and UV detection. Liquid chromatography allows the direct determination of trichlorfon and detection of any dichlorvos present. This method is applicable to quality control and storage stability analyses and eliminates any need for derivatization to counter the thermal lability of trichlorfon. The average standard deviations for the technical and 80% formulation determinations were 0.51 and 0.37%, respectively.

scholarly journals Determination of 3-Monochloropropanediol and Glycidol in Food Products

2022 ◽  
Vol 34 (2) ◽  
pp. 429-431
Author(s):  
A.I. Kozhushkevich ◽  
E.S. Kozeicheva ◽  
A.M. Lebedev ◽  
V.V. Ovcharenko ◽  
A.M. Kalantaenko
Keyword(s):  
Vegetable Oils ◽  
Milk Fat ◽  
Current Problem ◽  
Phenylboronic Acid ◽  
Food Products ◽  
Food Samples ◽  
Food Contaminants ◽  
Food Markets ◽  
New Challenges

Due to the increasing globalization of food markets, there are evolving new challenges for maintaing food safety. The current problem is the development of analytical methods for 3-monochloropropanediol ester and glycidol ester, which are food contaminants of concern for the scientific community. The levels of 3-monochloropropanediol ester and glycidol ester in certain food products are controlled by the European legislation. However, the maximum allowed concentrations and uptake limits for various food products are permanently revised. Therefore, we aimed to determine 3-monochloropropanediol ester and glycidol ester in various food products, which may contain vegetable oils. We analyzed food samples obtained from local food shops, predominantly low-priced products, which are more likely to contain vegetable oils, and adulterated milk fat. The levels of 3-monochloropropanediol ester and glycidol ester were determined indirectly by analyzing free 3-monochloropropanediol and glycidol ester obtained by hydrolysis and derivatized with phenylboronic acid. Samples were analyzed by GC-MS/MS on a triple-quad mass spectrometer.

scholarly journals New Methods in the Synthesis of (Meth)Acrylamides and Application Chelating Resin for Determination of Trace Metals in Certified Reference Materials and Waters

2021 ◽  
Author(s):  
Cengiz Soykan
Keyword(s):  
Trace Metals ◽  
Human Health ◽  
Certified Reference Materials ◽  
Direct Determination ◽  
Food Samples ◽  
Chelating Resin ◽  
Polymer Resin ◽  
New Methods ◽  
Instrumental Methods

The waste of trace metals are led the pollutions of water, soil and air. That’s why the accurate and sensitive identification of amount of trace metals in food samples and environment are gained importance in analytical chemistry because of their toxicity to human health. Besides, the direct determination of trace metals, presented at very low concentration especially in real samples, is difficult. In this content, before determination of trace metals by instrumental methods can be achieved successfully using separation/preconcentration procedures. The different synthesized chelating polymer resin adsorbents are successfully used for the SPE of trace metals. The trace metals, such as Cu, Cr, Co, Mn, Zn and Fe, are necessary for human health, when it has been taken at certain limits. But, the trace metals, such as Hg, Cd, Pb, Ni and As are toxic metals for the human body. About this, there are studies on the determination of trace elements and mineral in food samples and environment. In this study, new methods in the synthesis of (meth)acrylamides and use as a sorbent in the trace metals extraction was identified.

scholarly journals Simple Flow-Based System with an In-Line Membrane Gas–Liquid Separation Unit and a Contactless Conductivity Detector for the Direct Determination of Sulfite in Clear and Turbid Food Samples

Membranes ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 104
Author(s):  
Aulia Ayuning Tyas ◽  
Thitaporn Sonsa-ard ◽  
Kanchana Uraisin ◽  
Duangjai Nacapricha ◽  
Phoonthawee Saetear
Keyword(s):  
Direct Determination ◽  
Gas Diffusion ◽  
Food Samples ◽  
Hydrophobic Membrane ◽  
Liquid Separation ◽  
Separation Unit ◽  
Dried Fruit ◽  
Simple Flow ◽  
So2 Gas

This study presents a simple flow-based system for the determination of the preservative agent sulfite in food and beverages. The standard method of conversion of sulfite ions into SO2 gas by acidification is employed to separate the sulfite from sample matrices. The sample is aspirated into a donor stream of sulfuric acid. A membrane gas–liquid separation unit, also called a ‘gas-diffusion (GD)’ unit, incorporating a polytetrafluoroethylene (PTFE) hydrophobic membrane allows the generated gas to diffuse into a stream of deionized water in the acceptor line. The dissolution of the SO2 gas leads to a change in the conductivity of water which is monitored by an in-line capacitively coupled contactless conductivity detector (C4D). The conductivity change is proportional to the concentration of sulfite in the sample. In this work, both clear (wine) and turbid (fruit juice and extracts of dried fruit) were selected to demonstrate the versatility of the developed method. The method can tolerate turbidity up to 60 Nephelometric Turbidity Units (NTUs). The linear range is 5–25 mg L−1 SO32− with precision <2% RSD. The flow system employs a peristaltic pump for propelling all liquid lines. Quantitative results of sulfite were statistically comparable to those obtained from iodimetric titration for the wine samples.

Optical biosensor test strip for the screening and direct determination of l-glutamate in food samples

2012 ◽  
Vol 161 (1) ◽  
pp. 493-497 ◽  
Author(s):  
Noor Zuhartini Md Muslim ◽  
Musa Ahmad ◽  
Lee Yook Heng ◽  
Bahruddin Saad
Keyword(s):  
Direct Determination ◽  
Test Strip ◽  
Optical Biosensor ◽  
Food Samples

scholarly journals A review of current analytical methods for the determination of prebiotics in foods

2021 ◽  
Vol 4 (2) ◽  
pp. 146-159
Author(s):  
Son Tran Hung ◽  
Thanh An Vu Thi ◽  
Thanh Hoa Mac Thi ◽  
Khanh Cao Cong ◽  
Hong Hao Le Thi ◽  
...  
Keyword(s):  
Human Health ◽  
Intestinal Microbiota ◽  
Analytical Methods ◽  
Food Products ◽  
Food Samples ◽  
Beneficial Effects ◽  
Human Intestinal Microbiota ◽  
Good Potential ◽  
The Relationship

Prebiotics are a group that improves the human intestinal microbiota. The relationship&nbsp;between prebiotics and human health has been an area of increasing interest in recent years.&nbsp;Fructo-oligosaccharides and galacto-oligosaccharides are the two important groups of&nbsp;prebiotics with beneficial effects on human health. Besides that, more and more carbohydrates&nbsp;have shown a good potential to be prebiotics has been studied. This study presents a review of&nbsp;the characteristics, properties, and analytical methods used for the determination of prebiotics&nbsp;in food products. Most of the methods found using chromatographic methods, especially&nbsp;HPAEC - PAD but also another method, such as spectrometric methods have been presented.&nbsp;A discussion was presented highlighting the drawbacks of current analytical methods and the&nbsp;need to develop these methods to analyze the complex food samples containing prebiotics.

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