Malic acid

Malic acid is a crystalline white solid (m.p. 100°C) and is highly soluble in water.[…] Malic acid finds use in a variety of products, mostly in fruit-flavoured carbonates. It is the preferred acidulant in low-calorie drinks and in cider and apple drinks, enhancing flavour and stabilising colour in carbonated and non-carbonated fruit-flavoured drinks.