Besides vitamins and fiber, what class of compounds identified via spectroscopy was associated with anti-inflammatory activity and concentrated in the outer skin layer?

Answer

Triterpenoids

Triterpenoids were identified via spectroscopy, assigned a band around $922 ext{ cm}^{-1}$ in the infrared spectrum, and are typically concentrated in the outer skin layer.

Besides vitamins and fiber, what class of compounds identified via spectroscopy was associated with anti-inflammatory activity and concentrated in the outer skin layer?
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