Overview
Lopez-Calabozo and colleagues measured proximate composition and minerals in six commercial protein concentrates, two rice, two pea and two soybean. Each concentrate was bought twice, six months apart, from online shops. The paper does not name the sellers. Mineral results are means and standard deviations from the duplicate analysis, by inductively coupled plasma mass spectrometry after microwave digestion in nitric acid. The mineral table prints sodium through zinc in ppm, then selenium, nickel, chromium, cadmium and lead in ppb. Cadmium and lead footnotes give detection limits below 0.015 and below 0.026 without restating the unit. Those rows sit under the ppb heading.
Key numbers
Rice protein concentrate, anonymized product 1: nickel 240.22 +/- 19.88 ppb, chromium 208.98 +/- 4.31 ppb, cadmium not detected, lead not detected. Rice protein concentrate, anonymized product 2: nickel 604.54 +/- 65.39 ppb, chromium 627.11 +/- 2.34 ppb, cadmium not detected, lead 175.40 +/- 3.15 ppb. Pea protein concentrate, anonymized product 1: nickel 585.49 +/- 47.94 ppb, chromium 78.97 +/- 11.24 ppb, cadmium not detected, lead not detected. Pea protein concentrate, anonymized product 2: nickel 268.27 +/- 35.21 ppb, chromium 114.11 +/- 31.83 ppb, cadmium not detected, lead not detected. Arsenic and mercury were not measured. The table does not state a dry-weight or as-sold basis for the minerals. Proximate composition elsewhere in the paper is on a dry-weight basis. Growing origin is not reported.
Values were read from the Europe PMC JATS full text of PMC11816949, mineral composition table, because the publisher PDF download returned a challenge page. The publisher HTML was not used.
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