Why is TWEEN 20 measured in mg?

16 December 2018 0 4K Report

Hi everyone, I faced following problem. While trying to follow the procedure described in paper:

..A stock solution of b-carotene and linoleic acid was prepared as follows: 0.5 mg of b-carotene was dissolved in 1 ml of chloroform, 25 ml of linoleic acid and 200 mg of Tween 20 were added....

Question might be not so serious or not professional, but I in doubt about why is Tween 20 measured in mg. And how if there's something I don't know about this issue, how/where to get Tween in mg.

Kindly ask you to help with this situation,

Thank you in advance.

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