Multielemental fingerprinting and geographic traceability of Theobroma cacao beans and cocoa products
Multielemental fingerprinting and geographic traceability of Theobroma cacao beans and cocoa products
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DOI：
10.1016/j.foodcont.2016.01.013
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发表时间：
2016-07-01
期刊：
影响因子：
6
通讯作者：
Larcher, Roberto
中科院分区：
文献类型：
--
作者：
Bertoldi, Daniela;Barbero, Alice;Larcher, Roberto
可可是一种高价值商品，吸引消费者的口味，但它也因其抗氧化和健康特性而闻名。其中许多特征以及风味及其经济价值取决于地理来源。这项工作利用 ICP-MS 报告了东非、西非、亚洲以及中南美洲 23 个国家生产的 61 种可可豆的 56 种常量、微量和痕量元素的含量，并测试了基于元素谱开发的地理溯源新化学计量方法的有效性和稳健性。基于判别分析表明更具预测性的 29 种元素（Ag、As、Ba、Be、Bi、Ca、Cd、Co、Cr、Cs、Cu、Fe、Ga、Hg、K、Li、Mg、Mn、Na、Ni、P、Rb、Se、Sr、Th、T1、U、Y 和 Zn）的模型提供了 5 个次大陆起源之间的最佳区分，实现了 100% 的正确重新分类。该模型经过交叉验证，结果令人满意（> 85% 正确的重新分类）。最后，该模型在追踪 13 个商业黑巧克力样品的次大陆起源方面的令人满意的应用（77% 正确的重新分类）指出了有趣的机会。 (C) 2016 Elsevier Ltd. 保留所有权利。
Cocoa is a high-value commodity that appeals to the consumer's taste, but it is also renowned for its antioxidant and healthy properties. Many of these characteristics as well as flavour and its economic value depend on the geographic origin. This work reports the content of 56 macro-, micro- and trace elements of 61 cocoa beans produced in 23 countries of East and West Africa, Asia and Central and South America using ICP-MS and tests the efficacy and robustness of a new chemometric approach of geographic traceability developed on the base of elemental profiles. The model based on the 29 elements (Ag, As, Ba, Be, Bi, Ca, Cd, Co, Cr, Cs, Cu, Fe, Ga, Hg, K, Li, Mg, Mn, Na, Ni, P, Rb, Se, Sr, Th, T1, U, Y and Zn) indicated as the more predictive by the Discriminant Analysis provided an optimal discrimination among the 5 subcontinental origins, achieving 100% of correct re-classification. The model was cross-validated with satisfactory results (>85% correct reclassification). Finally, interesting opportunities were pointed out by the satisfactory application of this model in tracing back the subcontinental origin of 13 commercial samples of dark chocolate (77% correct reclassification). (C) 2016 Elsevier Ltd. All rights reserved.