Chemistry & ElectricityCâu 84 / 100
How do alpha hydroxy acids (AHAs) differ functionally from beta hydroxy acid (salicylic acid)?
a.AHAs are water-soluble and work mainly on the surface, while salicylic acid is oil-soluble and can penetrate sebum inside the follicle
b.AHAs are oil-soluble and salicylic acid is water-soluble
c.Both are oil-soluble and both dissolve only surface cells
d.Neither affects the skin's pH
Giải thích
Glycolic and lactic acid are water-soluble AHAs that loosen bonds between surface cells, while salicylic acid is a lipid-soluble BHA that travels into sebum-filled follicles, which is why it suits oily and acne-prone skin. The solubility descriptions are not reversed. Both act at a low pH and both increase photosensitivity, so daily sun protection is required.
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