Overview
Katyal et al. measured lead, arsenic, and cadmium in 30 instant-noodle packets purchased from large grocery stores in Canada. The study is useful for the rice-noodle and wheat-based pasta/noodle rows because it directly compares rice-based and wheat-based instant noodles on a dry-product basis. The authors found that rice noodles had significantly higher lead and arsenic than wheat noodles, while cadmium did not differ significantly by grain base.
Key numbers
| Finding | Source-reported value |
|---|---|
| Samples | 30 packets of instant noodles from 6 brands available in large Canadian grocery stores |
| Product fractions | Individual packs of noodles and accompanying dry seasoning packs were ground before digestion |
| Metals | Pb, As, Cd |
| Maximum-limit comparator used by authors | Pb 0.1 mg/kg; Cd 0.1 mg/kg; As 0.2 mg/kg |
| Lead range | 0.003 to 0.250 mg/kg in instant noodles |
| Cadmium range | 0.009 to 0.149 mg/kg in instant noodles |
| Arsenic | Present in tested samples; exact text-extractable range not provided in the PDF text layer |
| Rice vs wheat noodles | Rice noodles had significantly higher Pb and As than wheat noodles, p < 0.05; Cd was not significantly different |
| Brand comparison | One-way ANOVA found at least two of six brands differed significantly for Pb, As, and Cd, p < 0.05 |
| Method validation | Reported LODs were Pb 0.01 ug/kg, As 0.002 ug/kg, and Cd 0.004 ug/kg |
Figures 1-3 contain sample-level plots, but the accessible text layer does not expose every plotted value. The source page therefore records the explicit text ranges for lead (Pb) and cadmium (Cd), the source-stated rice-vs-wheat and brand findings, and avoids reconstructing graph-only values by eye.
Methods (brief)
The study purchased 30 instant-noodle packets from six brands in Canada. The authors ground the dry noodles and seasoning packs, used acid digestion, and analyzed Pb, arsenic (As), and Cd by ICP-MS/MS. Statistical tests included one-sample t-tests against the source-selected Pb/Cd/As comparator values, independent t-tests for rice-based versus wheat-based noodles, and one-way ANOVA across six brands.
Speciation is total/unspecified arsenic by the study’s reporting, not inorganic arsenic. The reported basis is dry instant-noodle product plus seasoning as prepared for digestion, not cooked/as-consumed noodles.
Implications
For product-category pages, this paper contributes direct Canadian-market occurrence evidence for rice noodles and wheat-based instant noodles/pasta products. It supports a market-specific point that rice-based instant noodles can carry higher Pb and total As than wheat-based instant noodles, while Cd did not separate by grain base in this small sample.
For standards and app work, the paper is source-scope evidence rather than an HMTc benchmark distribution by itself. Its data should stay separate from non-Canadian instant-noodle studies unless a later pooling pass documents market, basis, and product-fit comparability.
Related evidence
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