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  • 1990-1994  (6)
Source
Material
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Organic nutrient content of the US Food and Drug Administration's Total Diet and its possible use as a standard reference material (1990)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 338 (1990), S. 438-440 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Mixed diet composites containing 201 different foods from the United States Food and Drug Administration's Total Diet Study have been prepared to represent the intake of a 25- to 30-year-old male in the US. To date, foods from ten different collections have been received and composites representing six collections have been prepared and assayed. Each composite, representing one of four different geographical areas of the US (West, South, Northeast, North Central), was assayed for proximates (fat, protein, moisture, carbohydrates, and ash), elemental composition and organic nutrient content. The elemental content is reported separately. This paper deals with the proximate and organic nutrient content. The organic nutrients determined were thiamin, riboflavin, vitamin B6, vitamin B12, niacin, pantothenic acid, folic acid and biotin. The results to date show no significant variations in the contents among the individual collections. Portions of the collections have been freeze-dried and mixed to prepare a total diet reference material. Analytical results for nutrient content of the dry material are equivalent to those of the original composite.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00322512
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Mixed diet reference materials for nutrient analysis of foods: Preparation of SRM-1548 Total Diet (1990)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 338 (1990), S. 473-475 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Several mixed component diet materials have been available for use as reference materials for determination of elemental contents in food. These included H-9, issued by the IAEA and RM-8431, issued by NIST. Wide acceptance of these materials has exhausted supplies and they are no longer available. A new mixed food Standard Reference Material, SRM-1548 Total Diet, has been prepared and characterized for a number of elemental and organic constituents. This material was prepared from foods obtained from collections of the US FDA's Total Diet Study, which are representative of foods consumed by the US population. SRM-1548 has been composited from these foods, in proportions that are representative of daily intake. The composited foods were blended, freeze-dried, reblended and bottled in portions of 6 g. Homogeneity studies were carried out along with certification analyses for elements, cholesterol proximate and caloric content. This material is available from NIST and will be useful as a multi-purpose SRM for determinations of constituents in the naturally occurring range in foods and food related materials. Since this is a mixture of foods of both good and poorer sources, levels will be at the lower end of the concentration range for any individual constituent. Availability of further SRM's of individual foods with higher levels of specific constituents, such as SRM-1845 Cholesterol in Whole Egg will be required to extend the range of certified concentration values for food reference materials.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00322520
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Determination of boron and lithium in diverse biological matrices using neutron activation-mass spectrometry (NA-MS) (1990)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 338 (1990), S. 562-566 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Essential features of the neutron activation-mass Spectrometry (NA-MS) technique are described. Applicability of this technique for the simultaneous determination of boron and lithium is demonstrated for a diverse group of biomaterials. NA-MS is a nondestructive analytical technique, and dynamic in nature since its coverage extends to a broad range of concentration levels. Contamination after the irradiation step, extraneous by natural lithium or boron is inconsequential, since only the activation products are the analyted assayed. Coupling the nuclear activation phenomenon which generates 4He and 3He (from 10B and 6Li, respectively), with the high precision potential of mass spectrometry forms the bases of this technique. Under ideal conditions the detection limit is extendable to pg g−1 concentration ranges and therefore, it is extremely well suited to investigate the natural concentration levels of boron and lithium in biomaterials. The potential of this method for the determination of lithium in biomedical trace element research is of special significance since determination of sub-ppb levels of lithium by other analytical techniques faces serious analytical difficulties mainly due to contamination control and in some cases to insufficiently low detection limits.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00322539
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Determination of iodine in diverse botanical and dietary matrices by pre-irradiation combustion followed by neutron activation analysis (1994)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 348 (1994), S. 430-432 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The method chosen for determination of iodine in this investigation is an extension of an existing analytical technique to food samples which was developed for environmental samples. The method is based on pre-irradiation combustion of the sample to liberate iodine, trapping the iodine on charcoal, and quantitating the element by neutron activation analysis (NAA). Existing botanical and dietary reference materials were used to check the validity of the method. Several mixed diet samples with high fat content from the U.S. Total Diet Study and composites of cereals with both low and high iodine content were analyzed. This method of pre-irradiation combustion followed by NAA has been shown to be a viable technique for the determination of iodine in dietary samples. However, with a detection limit of about 50 ng of iodine, large amounts of sample (〉1 g) are typically required for each determination.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00325307
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Mixed total diet slurry as a prospective reference material (1994)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 348 (1994), S. 426-429 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A total diet composite based on foods from the U.S. FDA Total Diet Study was investigated to assess its suitability as a slurry material as a candidate reference material in the form of a slurry. Results for the distribution of chlorine and sodium (overall variation 2% for Na and 3% for Cl) indicated no serious problems of sedimentation. Similarly determination of Co, Se, Rb, Sn, Fe and Zn covering an overall concentration (dry weight basis) range of 25 ng/g for Co to 33 μg/g for Fe and Zn, suggests that the homogeneity of the composite is reasonably good. However the operational steps adopted for this preliminary investigation were not optimal. Use of a high pressure diffusion type of approach adopted by the National Research Council of Canada in preparing the lobster hepatopancreas matrix (LUTS-1) should further improve the homogeneity characteristics of the slurry.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00325306
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Long term stability of mitochondrial superoxide dismutase activity in NIST diets I–V (1990)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 338 (1990), S. 453-454 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Mitochondrial superoxide dismutase (MnSOD) is a ubiquitos, manganese containing enzyme common to most plant and animal cells. In order to determine the stability of an enzyme in frozen diet composites after long term storage, MnSOD activity was measured over a three year period in five different NIST samples. The CuZn SOD activity was below the detectable limits of the method employed. MnSOD activity was found in unhomogenized, well mixed portions of US Diets I and III. Recently, frozen aliquots of the five diet samples, which had been thawed and refrozen in April 1988, were again thawed and analyzed for SOD enzyme activity. The total enzyme activity was reduced from 50 to 60% as compared to that found in April 1988. The effect of extremes in temperature as a result of repetitive freezing and thawing is known to reduce the biological activity of other peptides. The results of this project indicate that NIST frozen diet composite samples will retain enzyme activity for as long as two years, and this may provide an additional organic substance measurable in these diet composite materials.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00322515
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    Paper (German National Licenses)
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