Chemistry

The essential oil contains alpha pinene, caryophyllene, cineol, Dlimonene, eugenol, and myrcene. The major constituents of the volatile acids include (E)cinnamic acid and (Z)3hexenoic acid. 5 , 10 The guava fruit has a high water content with lesser amounts of carbohydrates, proteins, and fats. The fruit also contains iron, vitamins A and C, thiamine, riboflavin, niacin, and manganese. The characteristic fruit odor is attributed to carbonyl compounds. Unripe fruits are high in tannins. The major constituent of the fruit skin is ascorbic acid, largely destroyed by canning and processing.