BRAN-1: Corn Bran Reference Material for Trace Metals and other Constituents
BRAN-1 is a Reference Material prepared from refined corn bran. Reference and information quantity values are provided in the following tables for trace metals and other constituents. Reference values are equally weighted means of results from at least two analytical methods and/or laboratories. Uncertainties are expressed as a 95% confidence interval. All values are expressed on a dry-mass basis.
Element | Mass fraction, mg/kg |
---|---|
Barium | 2.40 ± 0.52 |
Cadmium | 0.012 ± 0.005 |
Calcium | 420 ± 38 |
Copper | 2.47 ± 0.40 |
Iron | 14.8 ± 1.8 |
Lead | 0.140 ± 0.034 |
Magnesium | 818 ± 59 |
Manganese | 2.55 ± 0.29 |
Molybdenum | 0.252 ± 0.039 |
Phosphorus | 171 ± 11 |
Potassium | 566 ± 75 |
Rubidium | 0.5 ± 0.3 |
Selenium | 0.045 ± 0.008 |
Sodium | 430 ± 31 |
Sulfur | 860 ± 150 |
Zinc | 18.6 ± 2.2 |
Element | Mass fraction, mg/kg |
---|---|
Aluminium | 1.0 |
Antimony | 0.004 |
Arsenic | 0.002 |
Boron | 2.8 |
Bromine | 2.3 |
Chlorine | 31 |
Chromium | 0.11 |
Cobalt | 0.006 |
Iodine | 0.026 |
Nickel | 0.16 |
Nitrogen | 8 800 |
Strontium | 4.6 |
Vanadium | 0.005 |
Quantity | Value | Unit |
---|---|---|
Ash | 0.47 | g/(100 g), % |
Protein | 5.5 | g/(100 g), % |
Carbohydrate | 93 | g/(100 g), % |
Total dietary fibre | 90 | g/(100 g), % |
Energy content | 403 | kcal/(100 g) |
The protein concentration was calculated from the nitrogen values using a conversion factor of 6.25; subsequent calculations of carbohydrates and calories were also based on these protein concentrations. The value for energy content is the mean of the individual caloric calculations. If the mean proximate values are used for calculation, with caloric equivalents of 9, 4, and 4 for fat, protein, and carbohydrate, respectively.
Intended use
This Reference Material (RM) is intended for use in evaluating analytical methods and instruments used for the determination of major, minor, and trace constituent elements in corn bran and other similar food, agricultural, and biological materials. A minimum sample mass of 500 mg is recommended.
This material is intended for laboratory use, not for human consumption.
Uncertainty
Original uncertainty estimates for RM 8433 were verified at NRC and were retained in this report. As stated in the RM 8433 report [1], uncertainties are imprecision estimates expressed as a 95% confidence interval, based on a sample mass of at least 500 mg. These uncertainties, based on between-method and between-laboratory, between-unit and within-unit estimates of variances, include measures of analytical method and laboratory imprecisions and biases and material inhomogeneity.
BRAN-1
Date of Issue: September 2015
Date of Expiry: September 2025
Revised: March 2016 (editorial update)
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