scholarly journals Alpha Tocopherol Content of Selected Catering Products

2010 ◽  
Vol 67 (2) ◽  
Author(s):  
Adrian MAZAREL ◽  
Gabriel ROTARU ◽  
Cristian MATEA ◽  
Andreea BUNEA ◽  
Constantin BELE
Keyword(s):  
Thermal Treatment ◽  
Food Product ◽  
Food Products ◽  
Tocopherol Content ◽  
Significant Loss ◽  
Alpha Tocopherol ◽  
Excitation Wavelength ◽  
Food Groups ◽  
Fluorescence Detector ◽  
Liquid Chromatograph

Alpha tocopherol is recognized as inhibitor of lipid oxidation in biological systems and the intake of this vitamin is relevant to human health .Catering food products investigated in the current study have been chosen from two food groups: fish based food products and meat based food products.A number of ten food samples were investigated. Alpha tocopherol was analysed using a Shimadzu VP Series liquid chromatograph equipped with a fluorescence detector FR -10 AXL with excitation wavelength of 290 nm and emission wavelength of 325 nm. Data analysis suggest significant loss of tocopherol in meat and fish based food product as compared to the content found in thermal non-treated preparations. Thus, in fish preparation the cook-serve processing by conventional thermal treatment diminishes the tocopherol content by 58%; in case of microwave thermal treatment this loss is 64.5 %. It was found that the microwave thermal treatment generated lower tocopherol content by 10% versus the conventional thermal treatment. In case of thermally non-treated meat preparations the tocopherol content is 0.82 mg/100g product, greater than in fish preparations, but the loss registered by conventional thermal treatment and by microwave thermal treatment is approximately 21,95%, and 25,6%, respectively. In the case of meat preparations, the microwave thermal treatment generates a loss of tocopherol content greater by 16,6 % as compared to the conventional thermal treatment.

Determination of urinary placental estriol by reversed-phase liquid chromatography with fluorescence detection.

1980 ◽  
Vol 26 (1) ◽  
pp. 130-132
Author(s):  
J T Taylor ◽  
J G Knotts ◽  
G J Schmidt
Keyword(s):  
Reversed Phase ◽  
Excitation Wavelength ◽  
Fluorescence Detector ◽  
Liquid Chromatograph ◽  
Chromatographic Procedure ◽  
Natural Fluorescence ◽  
Phase Liquid ◽  
Near Term ◽  
Far Ultraviolet ◽  
Liquid Chromatographic

Abstract We describe a liquid-chromatographic procedure for determining urinary estriol concentrations. The urine sample, after enzymatic hydrolysis to free the conjugated estrogen, is extracted with ether, and an aliquot of the resulting extraction residue is injected into the liquid chromatograph. Sample components are separated with a reversed-phase C18 column and isocratic elution with an acetonitrile/water mobile phase. Using a far-ultraviolet excitation wavelength, we measure the natural fluorescence of the eluted estrogen with a fluorescence detector. The procedure provides excellent sensitivity for determing near-term pregnancy concentrations of urinary estriol. The selectivity of the method limits the effect of potentially interfering compounds.

scholarly journals Tocopherol Content in Vegetable Oils Using a Rapid HPLC Fluorescence Detection Method

2013 ◽  
Vol 41 (1) ◽  
pp. 93 ◽  
Author(s):  
Constantin BELE ◽  
Cristian T. MATEA ◽  
Camelia RADUCU ◽  
Vioara MIRESAN ◽  
Octavian NEGREA
Keyword(s):  
High Performance ◽  
Detection Method ◽  
Limit Of Detection ◽  
Direct Method ◽  
Tocopherol Content ◽  
Reversed Phase ◽  
Excitation Wavelength ◽  
Plant Oils ◽  
Fluorescence Detector ◽  
Edible Plant

A quick and direct method based on reversed phase high performance liquid chromatography with fluorescence detector for measuring tocopherols (α , β + γ and δ) has been developed. Oils are diluted in methanol: hexane: tetrahydrofuran (neither previous extraction of tocopherols nor saponification procedure are required) and after being vortexed and centrifuged, an aliquot of the overlay was injected directly into an Alltima C 18 column. Acetonitrile and methanol (50: 50) mixture was used as a mobile phase with a flow rate of 1 mL min-1. Quantification of tocopherols was performed by fluorescence detector at 290 nm excitation wavelength and 325 nm emission wavelength. Tocopherols were separated at 25°C in less than 10 min after injection. The method has good limit of detection (9 ng g-1 for α-tocopherol and 8 ng g-1 for β-, γ- and δ- tocopherols) and reproducibility (CV< 2.9 %). This method can be used to assess the influence of genetic modification of oil seeds on the distribution of tocopherols or the effect of tocopherols on the oxidative stability of edible plant oils.

Methods of Analysis for Toxic Elements in Food Products. 1. Mineralization Methods to Determine Heavy Metals and Arsenic According to the USSR Standard

1989 ◽  
Vol 72 (2) ◽  
pp. 286-290 ◽  
Author(s):  
Igor M Skurikhin
Keyword(s):  
Heavy Metals ◽  
Toxic Elements ◽  
Food Product ◽  
Food Products ◽  
Food Groups ◽  
Methods Of Analysis ◽  
Heavy Metals And Arsenic

Abstract Results of the work of 22 laboratories in the USSR on optimizing methods for mineralizing foods to determine Pb, Cd, As, Zn, Cu, Sn, and Fe are summarized. Recommendations are given on dry and wet mineralization as related to the analyte and the kind of food product. Optimum amounts of test portions for 22 food groups are also recommended according to the element of interest.

scholarly journals Ultrasound-Assisted Cold Pasteurization in Liquid or SC-CO2

Processes ◽  
2021 ◽  
Vol 9 (8) ◽  
pp. 1457
Author(s):  
Anna Abramova ◽  
Vladimir Abramov ◽  
Vadim Bayazitov ◽  
Roman Nikonov ◽  
Igor Fedulov ◽  
...  
Keyword(s):  
Thermal Treatment ◽  
High Efficiency ◽  
Food Product ◽  
Food Products ◽  
Ultrasonic Field ◽  
Chemical Transformations ◽  
Cold Pasteurization ◽  
A New Technique ◽  
Physical And Chemical

Various types of chemical and physical protocols are used, thermal treatment in particular, to increase the quality of bulk food products (for example, dates or some sort of nuts) and extend shelf life, and combinations of methods are frequently used to achieve the best results. However, the use of these processing methods is not always the best option to preserve the initial taste and appearance of food products. For instance, a product may lose its initial natural appearance and acquire different flavors due to chemical transformations that occur at certain temperatures or when the products are treated with chemicals. Non-thermal treatment methods are called “cold” pasteurization. This is a set of advanced techniques that are based on physical and chemical effects that do not result in the structural food-product transformations caused by heating. We have developed and tested a new technique for efficient food-product processing and cold pasteurization in an ultrasonic field under pressure in an atmosphere of supercritical or subcritical carbon dioxide. A laboratory-scale unit that was designed and built for this purpose has experimentally proven the feasibility of this process and demonstrated high efficiency in suppressing pathogenic flora.

Determination of urinary placental estriol by reversed-phase liquid chromatography with fluorescence detection.

1980 ◽  
Vol 26 (1) ◽  
pp. 130-132 ◽  
Author(s):  
J T Taylor ◽  
J G Knotts ◽  
G J Schmidt
Keyword(s):  
Reversed Phase ◽  
Excitation Wavelength ◽  
Fluorescence Detector ◽  
Liquid Chromatograph ◽  
Chromatographic Procedure ◽  
Natural Fluorescence ◽  
Phase Liquid ◽  
Near Term ◽  
Far Ultraviolet ◽  
Liquid Chromatographic

Abstract We describe a liquid-chromatographic procedure for determining urinary estriol concentrations. The urine sample, after enzymatic hydrolysis to free the conjugated estrogen, is extracted with ether, and an aliquot of the resulting extraction residue is injected into the liquid chromatograph. Sample components are separated with a reversed-phase C18 column and isocratic elution with an acetonitrile/water mobile phase. Using a far-ultraviolet excitation wavelength, we measure the natural fluorescence of the eluted estrogen with a fluorescence detector. The procedure provides excellent sensitivity for determing near-term pregnancy concentrations of urinary estriol. The selectivity of the method limits the effect of potentially interfering compounds.

Allergenomics and analysis of causes of unintentional incorpo‑ ration of substances capable of causing IgE‑mediated food allergy into meat products

2020 ◽  
Vol 5 (3) ◽  
pp. 4-11
Author(s):  
E. V. Kryuchenko ◽  
Yu. A. Kuzlyakina ◽  
V. S. Zamula ◽  
I. M. Chernukha
Keyword(s):  
Food Allergy ◽  
Risk Analysis ◽  
Meat Products ◽  
Food Product ◽  
Food Products ◽  
Legal Regulation ◽  
Comprehensive Assessment ◽  
Ige Mediated

The article discusses the definition and mechanism of IgE‑mediated food allergy, provides an overview of the legal regulation of the production and labeling of allergen-containing food products. In order to prevent the inadvertent appearance of allergens in products during their production, an allergenomics procedure is required — a comprehensive assessment of the allergic potential of a food product: allergenicity of product ingredients, risk analysis, and the procedure for managing allergens in the production.

Food advertising during children’s television programmes in Italy

2020 ◽  
pp. 1-8
Author(s):  
Silvano Gallus ◽  
Elisa Borroni ◽  
Chiara Stival ◽  
Sharanpreet Kaur ◽  
Sofia Davoli ◽  
...  
Keyword(s):  
Food Product ◽  
Food Products ◽  
Children's Television ◽  
World Health ◽  
Nutritional Values ◽  
International Guidelines ◽  
Food Advertisements ◽  
Health Organization ◽  
Almost All ◽  
The Eu

Abstract Objective: Previous studies from European countries noted that food products promoted on TV for children did not comply with international guidelines, including the World Health Organization European Nutrient Profile Model (WHO-ENPM) and the EU Pledge Nutrition Criteria (EU-PNC, an initiative developed by leading food companies). We aim to provide new data from Italy. Design: Evaluation of Italian TV advertisements. Data on nutritional values for food product advertised were compared with nutritional standards issued by the WHO-ENPM and the EU-PNC. Setting: In total, 180 h of TV programmes from six Italian channels, 2016–2017. Participants: Eight hundred and ten consecutive advertisements during children’s programmes. Results: Out of 810 advertisements, 90 (11·1 %) referred to food products. Among these, 84·5 % of the foods promoted did not meet the WHO-ENPM and 55·6 % the EU-PNC guidelines. Advertisements promoting sweet and salty snacks (i.e. ≥ 70 % of all foods) v. other food products showed higher non-compliance with both the WHO-ENPM (OR: 73·8; 95 % CI: 4·09, 1330) and the EU-PNC (OR: 9·21; 95 % CI: 2·82, 30·1). Conclusions: In Italy, most food advertisements during children’s programmes are not compliant with European nutritional standards. Almost all the advertisements for snacks do not meet international guidelines. As the WHO-ENPM guidelines do not propose standards for all the food products, including meals, there is an urgent need to define independent and easy-to-read guidelines for food advertisements targeting children. As a first step towards the complete ban of food advertisements targeting children recommended by other researchers, these guidelines should be enforced by all the TV broadcasts.

scholarly journals Anti-dementia drugs: what difference do they make?

1998 ◽  
Vol 8 (4) ◽  
pp. 279-280
Author(s):  
Jeffrey L. Cummings
Keyword(s):  
Free Radical ◽  
Daily Living ◽  
Cholinesterase Inhibitors ◽  
Active Agent ◽  
Significant Loss ◽  
Alpha Tocopherol ◽  
End Points ◽  
Anti Oxidant ◽  
Radical Generation ◽  
Home Placement

Alzheimer’s disease (AD) is a treatable disorder. Two classes of anti-dementia agents have emerged in the recent past: anti-oxidants and cholinesterase inhibitors. A recent study showed that the anti-oxidants alpha tocopherol (vitamin E) and selegiline slowed the progress of AD. Patients treated with either agent alone or with both agents in combination progressed to end-point more slowly than patients on placebo. Patients on placebo reached one of the end-points - death, nursing home placement, progression to severe AD, or significant loss of activities of daily living - in approximately 400 days, whereas patients on active agent required approximately 600 days to reach the same end-points. Both these agents have anti-oxidant properties; selegiline is a monoamine oxidase-B inhibitor that reduces free radical generation and alpha tocopherol has free radical capture capabilities. These agents are applied to patients in mild or moderate phases of AD, where slowing the progression of the illness and maintenance of patients at higher levels of function are the principal goals. Slowing the progression of the disease in more advanced phases of the illness may be less desirable.

scholarly journals Projected effects on salt purchases following implementation of a national salt reduction policy in South Africa

2020 ◽  
pp. 1-18
Author(s):  
Rhoda N. Ndanuko ◽  
Maria Shahid ◽  
Alexandra Jones ◽  
Terry Harris ◽  
Joel Maboreke ◽  
...  
Keyword(s):  
South Africa ◽  
South African ◽  
Salt Content ◽  
Meat Products ◽  
Food Product ◽  
Food Groups ◽  
Food Category ◽  
Cross Sectional ◽  
Salt Reduction ◽  
Sectional Analysis

Abstract Objective: To assess the contribution of different food groups to total salt purchases and to evaluate the estimated reduction in salt purchases if mandatory maximum salt limits in South African legislation were being complied with. Design: This study conducted a cross-sectional analysis of purchasing data from Discovery Vitality members. Data were linked to the South African FoodSwitch database to determine the salt content of each food product purchased. Food category and total annual salt purchases were determined by summing salt content (kg) per each unit purchased across a whole year. Reductions in annual salt purchases were estimated by applying legislated maximum limits to product salt content. Setting: South Africa Participants: The study utilised purchasing data from 344,161 households, members of Discovery Vitality, collected for a whole year between January and December 2018. Results: Vitality members purchased R12.8 billion worth of food products in 2018, representing 9,562 products from which 264,583 kg of salt were purchased. The main contributors to salt purchases were bread and bakery products (23.3%); meat and meat products (19%); dairy (12.2%); sauces, dressings, spreads and dips (11.8%); and convenience foods (8.7%). The projected total quantity of salt that would be purchased after implementation of the salt legislation was 250,346 kg, a reduction of 5.4% from 2018 levels. Conclusions: A projected reduction in salt purchases of 5.4% from 2018 levels suggests that meeting the mandatory maximum salt limits in South Africa will make a meaningful contribution to reducing salt purchases.

The effect of post-harvest storage on the weight of Golden Delicious apples

2021 ◽  
Vol 13 (2) ◽  
pp. 7-11
Author(s):  
Salma Kassebi ◽  
Péter Korzenszky
Keyword(s):  
Relative Humidity ◽  
Storage Temperature ◽  
Extended Period ◽  
Food Products ◽  
Significant Loss ◽  
Loss Of Weight ◽  
Ambient Storage ◽  
Golden Delicious ◽  
Different Levels ◽  
Careful Management

Apples, like other fruits, are exposed to stress during their growth and development in the field, also during harvest and the postharvest environment (processing, storage, and transportation). The refrigeration system allows for bulk handling of food products from harvest to market, ensuring that food products are maintained in their freshness and integrity for an extended period through careful management of storage temperature and humidity. This study investigated the effects of storage on the weight loss of apples (Golden Delicious fruits harvested at maturity), under refrigerated conditions at a temperature of 5±0.5°C and relative humidity of 82% and under ambient storage at a temperature of 25 ±0.5 °C and relative humidity of 60 %, over 3 months. The findings revealed that the two groups of apples experienced weight reduction at different levels. Apples placed at cold storage presented a loss of weight between 3.31g and 4.49g; however, apples stored at ambient temperature showed a significant loss of weight between 21.9g and 31.76g.

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