n-Propyl gallate is essentially odorless — a white to off-white crystalline antioxidant used to protect fragrance oils and fatty materials from oxidation. Any perceptible smell is a very faint, slightly phenolic or waxy off-note at high concentration.AI · claude-opus-4-7
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Perfume and Flavor Chemicals, page 1187.
Almost white, but commonly off-white or greyish microcrystalline powder or small crystals.
0.305 soluble in water, 50% soluble in alcohol, 1% soluble in most vegetable oils.
Practically odorless when pure, but some commercial products may carry a faintly dry-medicinal odor.
Aqueous solutions of higher than 10 ppm concentration have a perceptibly bitter taste, or bitter-metallic taste and mouthfeel. The material is tasteless in the concentrations recommended for finished products.
This ester is not an active flavor or perfume material, but it serves as an important antioxidant in many food products and flavor concentrates. It is also used to some extent in essential oils to retard oxidation of monoterpenes and sensitive aldehydes or ketones.
Lemon, Lime, Fruit and Spice flavors are also often treated with this material.