Betalains are water-soluble, nitrogen-containing pigments responsible for the vivid red, purple, yellow, and orange colors found in beets and several other plants belonging to the order Caryophyllales. Unlike anthocyanins, another major group of plant pigments, betalains generally maintain their characteristic colors over a relatively broad pH range. This property makes them attractive as natural colorants for foods and beverages where consistent appearance is important.
Betalains are divided into two main groups: betacyanins, which produce red to violet colors, and betaxanthins, which produce yellow to orange shades. The best-known betalain is betanin, the principal betacyanin in red beetroot and the compound largely responsible for its deep red-purple color. Other betalain pigments contribute to the range of shades observed in different plant varieties.
For plants, betalains are more than decorative pigments. They are believed to contribute to protection against environmental stresses, including excessive light, oxidative damage, drought, and certain pathogens. Their ability to interact with reactive oxygen species has also attracted scientific interest in their potential biological functions.
In human nutrition, betalains are being studied for their antioxidant and anti-inflammatory properties. Eating beetroot and other betalain-rich foods can contribute these compounds to the diet, and research has investigated possible effects on oxidative stress, inflammation, blood-vessel function, and cardiovascular health. However, evidence from human studies remains developing, and betalains should be regarded as one component of a varied, plant-rich diet rather than a standalone treatment for disease.
Their strong color and natural origin have made betalains increasingly valuable to the food industry. Beet-derived betalain preparations are commercially known as beetroot red or beet extract and are designated E162 in the European Union and other regulatory systems using the E-number convention. Their popularity has grown alongside consumer interest in recognizable, naturally derived ingredients and clean-label foods.
Food Applications
Betalains are used in numerous products. In dairy foods and frozen desserts, they can provide pink or red shades to berry-flavored yogurt, ice cream, sherbets, and milk-based beverages. In confectionery, they are used in products such as gummies, marshmallows, fondants, and certain candies. They can also color beverages, including fruit drinks, powdered mixes, and other formulations.
Betalains have applications in selected processed meat products and plant-based meat alternatives, where manufacturers may use them to create or enhance reddish tones. Their usefulness depends strongly on the particular formulation and processing conditions.
One major advantage is their high water solubility, allowing them to disperse readily in aqueous food systems. They are particularly effective in mildly acidic environments, with useful color stability commonly observed around pH 4–6.
However, betalains have limitations. Heat, oxygen, and prolonged exposure to light can accelerate pigment degradation, causing fading or undesirable color changes. Consequently, they are especially suitable for cold-processed, refrigerated, frozen, or relatively short-shelf-life products. Careful control of packaging, oxygen exposure, temperature, and processing conditions can help preserve their color.
Overall, betalains combine striking visual properties with natural origin and potential bioactivity. Their technological limitations mean they cannot replace synthetic colors in every application, but their expanding use demonstrates the growing role of plant-derived pigments in modern food production.Betalains: Natural Pigments with Growing Food Applications
