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Who observed citric acid as a by-product of calcium oxalate produced by Penicillium glaucum?

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Who observed citric acid as a by-product of calcium oxalate produced by Penicillium glaucum?

(a) Thomas Edison

(b) Carl Wilhelm

(c) Wehmer

(d) Adam

I got this question during an online interview.

My question is taken from Practical Benefits in section Practical Benefits of Fermentation of Fermentation Technology

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Right answer is (c) Wehmer

For explanation: Wehmer in 1893 observed citric acid as a by-product of calcium oxalate produced by Penicillium glaucum. This resulted in the encouragement of the production of citric acid.

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