Shchukin et al. 2018 - brown algae metals

Shchukin et al. measured elemental impurities in Laminaria brown-algae herbal medicinal products purchased from Moscow pharmacies, supplementing the authors’ measurements with literature rows for global Laminariales and Fucales. The routeable occurrence evidence from this source is the six rows marked as the authors’ own experimental data in Tables 2 and 3. Arsenic is reported only as total arsenic, mercury only as total mercury, and chromium only as total chromium.

Key numbers

Table 2 reports regulated elemental toxicants in mg/kg for the six author-measured Laminaria samples. The Methods section states that samples were dried to constant mass before digestion, so these are dry-product values:

Table 3 reports additional elements in mg/kg for the same six author-measured Laminaria samples:

The paper also states, across the combined literature plus author data and recalculated to dry product, that Table 2 spans 4,9 - 73 mg/kg As, 0,11 - 16 mg/kg Cd, 0,01 - 20 mg/kg Hg, and < 0,05 - 95 mg/kg Pb. Those broader ranges are literature-context summaries rather than the six author-measured pharmacy-product rows.

Methods (brief)

The experimental objects were samples of the herbal medicinal product “Laminaria thalli” purchased from Moscow pharmacy chains. Raw material for samples I and II was collected in Russia from the White Sea in 2016 and 2014; samples III-VI were from China. Samples were dried to constant mass at 105°C for 2 h, ground to a homogeneous powder, sieved through a 1 mm mesh, then 0,5 g was digested with 8,0 cm3 concentrated nitric acid and 2,0 cm3 deionized water in a Milestone Ethos Up microwave system. The digest was filtered and diluted to 25 cm3. Elements were measured by ICP-MS on an Agilent 7900, with results reported as the mean of 3 parallel measurements and checked against a TEA LEAVES (INCT-TL-1) reference material.

Implications

This source supports seaweed/kelp food and algae-seaweed supplement occurrence context for dry Laminaria products in the Russian pharmacy market, with raw-material origins in Russia and China. The six author-measured rows should be treated as the primary occurrence data; the remaining rows in Tables 2 and 3 are secondary literature comparisons and should not be pooled as new primary samples from this source. Total arsenic, total mercury, and total chromium labels should be preserved because the source does not report inorganic arsenic, methylmercury, or Cr(VI).

Wiki pages this source may touch

• seaweed-kelp-foods
• supplements-algae-seaweed-based
• seaweed
• arsenic-total
• cadmium
• mercury-total
• lead
• aluminum
• cobalt
• chromium
• copper
• iron
• manganese
• nickel
• zinc

Verification notes

• Identity checks before writing found no existing source page for DOI 10.30906/0023-1134-2018-52-7-30-36, raw handle MFK_4498-18828-2-pb, or cite key shchukin2018-brown-algae-metals.
• All Key numbers were rechecked against /tmp/hmi-seaweed-011.txt, extracted with pdftotext -layout; the Cyrillic text extracts as mojibake, but the Table 2 and Table 3 numeric rows, English abstract, DOI, and author line are extractable.
• Table rows marked with * are the authors’ own experimental data and are the only rows treated here as routeable primary occurrence values. Literature rows and the paper’s broad literature ranges remain context.
• Units and basis are preserved as mg/kg dry-product values; no conversions were performed. The source uses decimal commas for most numeric values, which are retained here except the extracted 267.3 Table 3 Sr value.
• Speciation check: arsenic is reported as As only and is recorded as tAs; mercury is reported as Hg only and is recorded as tHg; chromium is reported as Cr only and is not treated as Cr(VI).
• Brand firewall: the paper describes purchase from Moscow pharmacy chains but does not report pharmacy or product brand names.

Page history

The five most recent substantive edits to this page. The full version history lives in git; when DOI minting comes online (see schema docs), each entry below will also link to a version-pinned DataCite DOI.