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. 2018 Mar 1:242:225-231.
doi: 10.1016/j.foodchem.2017.09.038. Epub 2017 Sep 8.

Arsenic hyperaccumulation and speciation in the edible ink stain bolete (Cyanoboletus pulverulentus)

Simone Braeuer  1 , Walter Goessler  1 , Jan Kameník  2 , Tereza Konvalinková  3 , Anna Žigová  4 , Jan Borovička  5
Affiliations

Arsenic hyperaccumulation and speciation in the edible ink stain bolete (Cyanoboletus pulverulentus)

Simone Braeuer et al. Food Chem. .

Abstract

The edible ink stain bolete (Cyanoboletus pulverulentus) was found to hyperaccumulate arsenic. We analyzed 39 individual collections determined as C. pulverulentus, mostly from the Czech Republic. According to our results, concentrations of arsenic in C. pulverulentus fruit-bodies may reach 1300mgkg-1 dry weight. In most collections, data for total and bioavailable arsenic in underlying soils were collected but no significant correlation between the soil arsenic content and arsenic concentrations in the associated fruit-bodies was found. Within the fruit-bodies, we found the majority of arsenic accumulated in the hymenium. Besides occasional traces of methylarsonic acid (MA), the arsenic speciation in all mushroom samples consisted solely of dimethylarsinic acid (DMA) and no inorganic arsenic was detected. Because of the carcinogenic potential of DMA, C. pulverulentus should not be recommended as an edible mushroom and its consumption should be restricted.

Keywords: Dimethylarsinic acid; Edible mushrooms; HPLC-ICPMS; Health risk; Soil.

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Figures

Fig. 1
Fig. 1
(A) Cyanoboletus pulverulentus, fruit-bodies of the collection CBP-15 (PRM 944013, EMBL-Bank LT714707). (B) Distribution of sampling sites in the Czech Republic.
Fig. 2
Fig. 2
(A) Relationship between As concentration (mg kg−1) and fruit-body dry weight (g) in Cyanoboletus pulverulentus, collection CBP-11 (n = 16); linear regression is indicated. (B) Relationship between total As content (μg) in fruit-bodies and fruit-body dry weight (g) in the same collection; linear regression is indicated.
Fig. 3
Fig. 3
Distribution of arsenic concentrations (figures indicated in fruit-bodies, mg kg−1) and total arsenic contents (µg) and their percentage in two individual fruit-bodies of Cyanoboletus pulverulentus: collection CBP-10b (fruit-body dry weight 6.23 g) and collection CBP-25b (fruit-body dry weight 4.94 g). Arsenic concentrations in complete fruit-bodies and underlying soils (total and bioavailable arsenic: sum of both extracted fractions) are also indicated.
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