Overview
Yucel and Atasoy quantified iron, copper, and zinc in 75 unpackaged spice samples (black pepper, cumin, red pepper) from herb stores and local markets in Van, Turkey, using ICP-MS. No toxic heavy metals were measured. The cumin samples had Fe 467 mg/kg, Cu 12.3 mg/kg, and Zn 36.5 mg/kg. Both Fe and Zn were highest in cumin among the three spice types; Fe exceeded the WHO 1984 guideline of 300 mg/kg in both black pepper and cumin samples. The paper is primarily relevant to the essential mineral profile of cumin seeds; it provides no data on lead, cadmium, arsenic, mercury, or other toxic metals.
Key numbers
Mean concentrations in Van market spices (mg/kg, ICP-MS, n=25 per spice):
| Spice | Fe (mg/kg) | Cu (mg/kg) | Zn (mg/kg) |
|---|---|---|---|
| Black pepper | 557.5 +/- 315.8 | 19.4 +/- 7.6 | 17.6 +/- 7.6 |
| Cumin | 467 +/- 225.5 | 12.3 +/- 3.9 | 36.5 +/- 14.1 |
| Red pepper | 122.5 +/- 48.1 | 11.9 +/- 5.2 | 11.9 +/- 2.0 |
| WHO limit (1984) | 300 | 50 | 100 |
Statistically significant differences among groups (P<0.001) for all three metals. Black pepper and cumin Fe exceeded the WHO 1984 reference level; all Cu and Zn values were within WHO limits.
Daily health risk for cumin (Table 2 in paper):
- Fe: 187 x 10^-2 mg/kg/day (assumed 20 g spice/day, 50 kg body weight; above WHO MRL of 70 x 10^-2)
- Cu: 4.9 x 10^-3 mg/kg/day (below WHO MRL of 10 x 10^-3)
- Zn: 14.6 x 10^-3 mg/kg/day (below WHO MRL of 300 x 10^-3)
Methods (brief)
ICP-MS: Thermo Scientific UK, X Series 2. Wet digestion: 65% HNO3 and HClO4 mixture (Allen 1986 method); 0.5 g sample in 3:1 HNO3/HClO4 mixture, heated to 70 degrees C. Final volume 25 mL with double-distilled water. Calibration: multi-element ICP-MS Standard (Inorganic Ventures, USA); LOD for Fe, Cu, Zn: 0.021, 0.003, and 1.77 ug/g. Recovery: 95.4%, 93.8%, 91.5% for Fe, Cu, Zn. RSD <10%. Statistics: IBM SPSS V23, one-way ANOVA, Tukey HSD.
Implications
Scope limitation: The paper measures only Fe, Cu, and Zn. It provides no toxicologically relevant data for cumin lead, cadmium, arsenic, mercury, chromium, or nickel — the metals of primary interest in HMI contamination profiling. The Fe exceedance of the WHO 1984 reference is flagged for context but is not directly comparable to regulatory limits for toxic metals.
Essential mineral context: The Fe (467 mg/kg) and Zn (36.5 mg/kg) values in cumin from Van, Turkey are consistent with published ranges for cumin seed mineral content in other studies (e.g., Gamit et al. 2023 reports Zn 61-93 mg/kg in Indian germplasm; the lower Turkish market value may reflect differences in soil or variety).
Related evidence
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