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:

2016-12-13