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.

Table 1: Reference values for BRAN-1

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

Table 2: Information values for BRAN-1

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

Table 2 (continued): Information values for BRAN-1

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)

Date modified: