A retail market study of organic and conventional potatoes (Solanum tuberosum): mineral content and nutritional implications.

摘要

Whether or not all foods marketed to consumers as organic meet specified standards for use of that descriptor, or are nutritionally different from conventional foods, is uncertain. In a retail market study in a Western US metropolitan area, differences in mineral composition between conventional potatoes and those marketed as organic were analysed. Potatoes marketed as organic had more Cu and Mg (p < 0.0001), less Fe (p < 0.0001) and Na (p < 0.02), and the same concn. of Ca, K and Zn as conventional potatoes. Comparison of individual mineral concn. between foods sold as organic or conventional is unlikely to establish a chemical fingerprint to objectively distinguish between organic and conventional produce, but more sophisticated chemometric analysis of multielement fingerprints holds promise of doing so. Although statistically significant, these differences would only minimally affect total dietary intake of these minerals and be unlikely to result in measurable health benefits.