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At least 127 records · Page 7Linked to original sources
PubMed2000

C30 stationary phases for the analysis of food by liquid chromatography.

The introduction of a polymeric C30 liquid chromatographic column by Sander et al. [Anal. Chem., 66 (1994) 1667] designed for the separation of carotenoid isomers, has led to the development of improved analytical methods for these compounds. Subsequent commercial availability of polymerically bonded C30 columns has facilitated these advances, and applications to a wide variety of separation problems with biological samples have been described. This report provides a comprehensive review of applications of polymeric C30 columns, utilized in the determination of carotenoids, retinoids, and other nutrients and related compounds in complex, natural-matrix samples.

Carbon↗
PubMed1993

Simultaneous kinetic-based determination of fructose and ascorbate with a rotating bioreactor and amperometric detection: application to the analysis of food samples.

A recently introduced biosensor comprising a rotating bioreactor and a stationary platinum ring amperometric detector (Anal. Chem. 1993, 65, 636-639) has been utilized for the simultaneous determination of fructose and ascorbate. The approach has been successfully applied to the simultaneous determination of these analytes in fresh food samples. Hexacyanoferrate(II) is the monitored species at +0.380 V vs a Ag/AgCl, 3 M NaCl reference. The determination takes advantage of a fast chemical oxidation of ascorbate by hexacyanoferrate(III) ions and the subsequent slower production of hexacyanoferrate(II) in the D-fructose 5-dehydrogenase-catalyzed reaction between D-fructose and hexacyanoferrate(III) as acceptor. D-Fructose 5-dehydrogenase (EC 1.1.99.11) was incorporated into the rotating disk reactor in immobilized form and on controlled-pore glass via the glutaraldehyde attachment and cross-linking with bovine serum albumin. Sample/reagent processing was accomplished by programmed continuous-flow/stopped-flow/continuous-flow operation.

Ascorbic Acid↗
PubMed2004

LC-UV and LC-MS analysis of food and drink products containing kava.

A method for the determination of six kava lactones, methysticin, dihydromethysticin, kawain, dihydrokawain, yangonin and desmethoxyyangonin, in solid foods and beverages has been developed. Solid samples were prepared using methanol extraction, while beverages were extracted using a separate solid phase extraction (SPE) method. After sample preparation, the extracts were analysed using LC-UV or atmospheric pressure photoionization (APPI) LC-MS in the positive mode. Using the method, 10 beverage products, two chocolate products, three unbrewed tea products, three dietary supplements and a drink mix product were analysed. The results obtained using the LC-UV were comparable to those obtained using APPI-LC-MS for most products. Using the SPE method in conjunction with LC-MS, individual kava lactones were detected in drink products at ppb concentrations. Concentrations of total kava lactones ranged between 135-0.035 mg per serving in the food and beverage products tested and between 40-61 mg per serving for the dietary supplement products tested. Results of these analyses as well as extraction efficiency and reproducibility data are reported.

Beverages↗
PubMed1983

Application of near infrared spectrophotometry to the nondestructive analysis of foods: a review of experimental results.

The authors are reviewing here the development and the application of the nondestructive spectrophotometric analytical techniques applied to the agricultural commodities. Following a short description of the theoretical bases of this technique, the most significant applications are reviewed leading to the evolution of the first generation of instruments based on such principles. The applications of the specific instruments developed for on-line measurements are summarized. The Grain Quality Analyzers actually marketed and their use in the determination of a wide range of components in foods are described. The experience gained by the research developed using such instruments has generated a new series of computerized instruments allowing for new methodologies and applications that are discussed and reviewed here. The state of the art and the development trends are briefly discussed, particularly referring to the research aimed to the extension of this technique to evaluate different chemical compounds in foods, to use as quality indices for agronomic, processing, and marketing purposes.

Computers↗
PubMed1978

Dietary fiber: analysis and food sources.

The sources of dietary fiber are reviewed and the chemistry of the various components discussed in relation to their possible physiological properties and their analytical measurement in foods and the diet as a whole. Complete fractionation of all the polysaccharide species would be a time-consuming exercise; nevertheless some characterization of dietary fiber seems essential to an understanding of any physiological role. The composition of the dietary fiber in a range of foodstuffs is presented, and the relative contributions of the major food groups to the intake of total dietary fiber is outlined.

Cellulose↗
PubMed2005

Matching food security analysis to context: the experience of the Somalia food security assessment unit.

This case study reviews the experience of the Somalia Food Security Assessment Unit (FSAU) of operating a food security information system in the context of a complex emergency. In particular, it explores the linkages between selected features of the protracted crisis environment in Somalia and conceptual and operational aspects of food security information work. The paper specifically examines the implications of context characteristics for the establishment and operations of the FSAU field monitoring component and for the interface with information users and their diverse information needs. It also analyses the scope for linking food security and nutrition analysis and looks at the role of conflict and gender analysis in food security assessment work. Background data on the food security situation in Somalia and an overview of some key features of the FSAU set the scene for the case study. The paper is targeted at those involved in designing, operating and funding food security information activities.

Food Supply↗
PubMed1988

From healthy soil to healthy food: an analysis of the quality of food produced under contrasting agricultural systems.

Studies under controlled experimental conditions show a clear advantage for staple food grown under biological/ecological farming conditions as compared to those from conventional farming methods. This is especially true for the vegetative parts of plant products, where lower undesirable (e.g. nitrates) and higher desirable (e.g. vit. C, trace elements) components are present. A better storage quality of plant products (e.g. cabbage, carrots) is also frequently the consequence of biological/ecological farming practices. An overall significantly lower level of residues of agrochemicals has been demonstrated in such products. It is increasingly noticeable, that especially in Central Western Europe, consumers are not exclusively interested in "healthier" food for themselves but also in an healthy environment. This is one of the important reasons, why they are interested in buying food from biological/ecological farming systems and why they are prepared to pay higher prices for such products.

Agriculture↗
PubMed2001

[Application and improvement of aflatoxin analysis in foods using a multifunctional column and HPLC].

In an earlier report, we developed a rapid, sensitive and clean method consisting of non-chloroform extraction, clean-up on a commercial multifunctional cartridge column and HPLC with fluorescence detection for the analyses of aflatoxins. In this report, we applied this method to analyze aflatoxins in nuts, giant corn, cereals, spice and black teas. The method was effective for macadamia nuts, walnuts, hazelnuts, brazil nuts, giant corn, rice, wheat and buckwheat, and the recoveries of aflatoxins B1, B2, G1 and G2 spiked in them at the level of 10 ng/g were 85-106%. However, in the chromatograms of spices and black tea, many background peaks were observed. Therefore, we added a purification step with an affinity column to the clean-up of these samples with the multifunctional cartridge column. After the additional purification, most of the background peaks were gone. The recoveries of aflatoxins B1, B2 and G1 spiked at the level of 10 ng/g were 71-112% except for the case of B2 in white pepper (48%). The recoveries of G2 were 49-95%.

Aflatoxins↗
PubMed1986

[Application of the calculation factor to the analysis of foods of Venezuela].

The direct weighing method was used to determined the Conversion Factor (rate that exists between gross weight and net weight of a food) of tubers, vegetables, fruits, meats, viscerae, cheese and eggs. The amount of food lost by discarding the nonedible portion, was also established. Results from applying the Conversion Factor revealed that values obtained, differed from those reported in the Food Composition Table for Practical Use of the National Institute of Nutrition of Venezuela.

Food Analysis↗