Malic acid

Malic Acid is an organic compound, specifically a dicarboxylic acid. It is universally produced by all living organisms, contributes to the tartness of various fruits, and is employed as a food additive. Malic Acid exists in two stereoisomeric forms, L- and D-enantiomers, with only the L-isomer occurring naturally. Salts and esters derived from Malic Acid are referred to as malates. The malate anion serves as an intermediate in the citric acid cycle. Malic acid possesses a clean and smooth flavor profile with a lasting sourness, making it suitable for blending with other food acids, sugars, high-intensity sweeteners, and flavors to create distinct taste sensations. It's important to note that Malic Acid should not be confused with Maleic Acid or Malonic Acid.

Synonyms
Malic Acid, Äpfelsäure, 2-Hydroxybernsteinsäure, Apple Acid, DL Malic Acid, E 296, Hydroxybutanedioic Acid, Hydroxysuccinic Acid
Chemical Formula
C4H6O5
CAS Number
6915-15-7

Characteristics

Molar Weight
134.09 g/mol
Melting Point
131.1°C
Flash Point
202.8°C
Forms
Crystals, White

Uses and Applications

Key applications

  • Buffer agent
  • Flavouring agent
  • Wine production
  • pH control
  • Acidifying agent
  • Personal care
  • Anti-ageing products

Malic acid

Malic acid (also ‘2-hydroxy succinic acid’) is a chemical compound from the groups of dicarboxylic and hydroxycarboxylic acids, which occurs as dextrorotatory D- (synthetic) and levorotatory L-malic acid (natural).

Properties of malic acid

Malic acid is a white powder that dissolves well in water and acetone. The esters and salts of malic acid are called malates. The synthetic production of malic acid in the chemical industry is carried out in a biotechnological process by adding water to fumaric acid or maleic acid.
Apples

Malic acid in the food industry

Due to its properties as an acidifier and flavour enhancer, malic acid is used in various applications in the food industry under the name E296. It gives lemonades, fruit juices, confectionery and snacks a sour flavour. Malic acid is used as an acidifier in baking powder and is used in fermented milk products such as yoghurt and certain types of cheese to optimise flavour and texture.
Malic acid is added to fruit preserves and jams to extend their shelf life. In meat processing, malic acid acts as a pH regulator and preservative and also contributes to the tenderness of the meat.
The use of malic acid in the food industry also improves the solubility of ingredients and stabilises vitamins and colourings.

Malic acid in the cosmetics industry

Malic acid is an important ingredient for skin, hair and dental care products. It is often used in the cosmetics industry as a fruit acid (AHA, alpha hydroxy acid) due to its versatile properties.
In facial and body scrubs, malic acid removes dead skin cells and promotes skin renewal. In anti-ageing products, malic acid helps to reduce wrinkles, stimulates collagen production and improves skin structure. Malic acid is also used in the treatment of acne, in toothpastes and mouthwashes and in moisturising creams and lotions.

Malic acid in medicine

Supplements containing malic acid are used for chronic fatigue syndrome or often in combination with magnesium as a dietary supplement to relieve the symptoms of fibromyalgia. The combination of both substances can help to reduce muscle and joint pain.
Malic acid stimulates saliva production and is used to treat dry mouth (xerostomia). It is also an ingredient in dental products that prevent tooth decay. Malic acid supports the production of digestive enzymes and thus reduces flatulence and other digestive problems.
During heavy metal detoxification, malic acid can contribute to the binding and elimination of heavy metals such as aluminium from the body.