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Quality assuring of wheat flour as a reference material for protein measurements

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Abstract

Certified reference materials (CRM) are essential tools for calibration of measuring instruments, validation of analytical methods and assuring quality of measurement results. However, in the case of the mass fractions protein and moisture in wheat flour, which is used to determine the quality and the market ability of flour, there is a lack of matrix reference materials. CRM for protein and moisture in wheat flour has been measured by the National Institute of Standards, Egypt. This article describes the value assignment of the mass fractions nitrogen and moisture in wheat flour by using Kjeldahl and dry oven; then, measuring the samples by inframatic analyzer system, the results were statistically analyzed and weighted mean; the results were found to be 10.33 % ± 0.36 % (k = 2) for protein and 16.98 % ± 0.30 % (k = 2) for moisture (as mass fractions). Finally, with performance test program for the samples used from wheat flour our lab reported satisfactory results.

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Notes

  1. Sodium hydroxide (NaOH) 40% with certificate of analysis associated by Panreac—SPAIN with code 171220, Batch No. 0000463126.

  2. Hydrochloric acid (HCl) 0.25 mol/l with certificate of analysis associated by Panreac—SPAIN with code 182318, Batch No 0000370059.

  3. Boric acid (H3BO3) 4% with certificate of analysis issued by Panreac—SPAIN with case No. 10043-35-3, EC-No.: 233-139-2.

  4. WF-cal. Means wheat flour (CRM) which used in calibration process with certificate with NIS [273/41/2018].

  5. These certificates traceable to National Institute of Standard (NIS)—Egypt.

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Authors and Affiliations

  1. Textile Metrology Laboratory, Chemical Metrology Division, National Institute of Standards (NIS), Giza, Egypt

    R. I. Mahmoud & N. S. Abdelaziz

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  1. R. I. Mahmoud
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  2. N. S. Abdelaziz
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Correspondence to R. I. Mahmoud.

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Mahmoud, R.I., Abdelaziz, N.S. Quality assuring of wheat flour as a reference material for protein measurements. Accred Qual Assur 25, 253–257 (2020). https://doi.org/10.1007/s00769-020-01435-7

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  • DOI: https://doi.org/10.1007/s00769-020-01435-7

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