There are errors in sentences 3–7 of the Abstract. The correct text is as follows: Vitamin D₄ was present (>0.01 µg/100 g) in a total of 18 composites and in at least one composite of each mushroom type except white button. The level was highest in samples with known UV exposure: vitamin D enhanced portabella, and maitake mushrooms from one supplier (0.02–0.7 and 2.25–3.54 µg/100 g, respectively). Other mushrooms had detectable vitamin D₄ in some but not all samples. In one composite of oyster mushrooms the vitamin D₄ content was about 25% of the vitamin D₂ content (0.63 vs. 2.59 µg/100 g). Vitamin D₄ exceeded 0.2 µg/100 g in the morel and chanterelle mushroom samples that contained D₄, but was undetectable in two morel samples.

There are multiple errors in the section titled Vitamin D₄ content of mushrooms. The corrected text is as follows.

Paragraph 1, Sentence 2: Overall, vitamin D₄ was detected (>0.01 μg/100 g) in 18 of the total of 38 composites analyzed and was present at an average concentration of 0.52 µg/100 g.

Paragraph 1, Sentences 4–6: There were 7 samples known to contain mushrooms that had been exposed to UV light during production: the Mushroom CC, the vitamin D enhanced portabella, and the two maitake samples from supplier C (Table 1). All of these samples contained vitamin D₄. The two maitake mushroom samples that were high in vitamin D₂ (63.2 and 48.9 μg/100 g) were also high in vitamin D₄ (3.54 and 2.25 μg/100 g, respectively). These mushrooms were found to have been exposed to UV light based on the growing conditions reported to be used by this producer [26].

Paragraph 1, Sentences 8–9: In oyster mushrooms the composite highest in vitamin D₂ (2.59 μg/100 g) had a vitamin D₄ content approximately 25% of D₂ (0.63 μg/ 100 g). Vitamin D₄ exceeded 0.2 μg/100 g in the morel and chanterelle mushroom samples that contained D₄ (all but two morel composites).

Paragraph 2, Sentences 2–3: The mean vitamin D₄ concentration in the Mushroom CC samples assayed in this study was 0.014 μg /100g with a standard deviation of 0.0042 μg /100 g (standard error, 0.0008 μg /100 g). Greater precision at higher concentrations would be expected [27].

There are errors in Table 1 and in Fig 4. In Table 1 and Fig 4, the values for vitamin D₄ were off by a factor of 10. The Table 1 caption incorrectly reads “pre-vitamin D₄” instead of “pro-vitamin D₄”. Please see the corrected Table 1, Table 1 caption, and Fig 4 below.

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Fig 4. Relationship between the vitamin D4 and vitamin D2 concentrations in ten types of mushrooms (Table 1).

Data for vitamin D2 were previously reported [14].

https://doi.org/10.1371/journal.pone.0253992.g001

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Table 1. Vitamin D₄ and pro-vitamin D₄ (22,23-dihydroergosterol; ergosta-5,7-dienol) content of ten types of mushrooms.

https://doi.org/10.1371/journal.pone.0253992.t001