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Thaumatin (E 957) – Natural Sweet Protein Explained

Thaumatin is a natural sweet-tasting protein derived from the West African katemfe fruit. It is one of the sweetest known substances and is approved as a food additive (E 957).

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Things worth knowing about "Thaumatin"

Thaumatin is a natural sweet-tasting protein derived from the West African katemfe fruit. It is one of the sweetest known substances and is approved as a food additive (E 957).

What is Thaumatin?

Thaumatin is a naturally occurring sweet protein extracted from the aril of the fruit of the West African plant Thaumatococcus daniellii, commonly known as the katemfe plant. It belongs to the class of intense sweeteners and is approved as a food additive in the European Union under the designation E 957. Thaumatin is approximately 2,000 to 3,000 times sweeter than sucrose (table sugar) on a weight-for-weight basis, making it one of the sweetest naturally occurring substances known to science.

Origin and Production

The katemfe plant (Thaumatococcus daniellii) is native to the tropical rainforests of West Africa, particularly in Ghana, Sierra Leone, and Ivory Coast. The fruits are harvested, and the sweetness-active protein is extracted from the gelatinous aril surrounding the seeds. Several thaumatin variants exist (Thaumatin I, Thaumatin II, and other isoforms), differing slightly in their amino acid sequences and sweetness potency. Commercial production involves aqueous extraction followed by purification steps.

Chemical Properties and Mechanism of Action

Thaumatin is a small protein with a molecular weight of approximately 22 kDa, consisting of a single polypeptide chain of 207 amino acids. Its sweetness results from binding to sweet taste receptors (T1R2/T1R3) on the tongue. Due to its relatively large size as a protein molecule, the onset of sweetness is slightly delayed compared to sucrose and tends to linger longer. This characteristic, mildly liquorice-like aftertaste is a well-known feature of thaumatin.

Applications in the Food Industry

Due to its intense sweetness, thaumatin is used in very small quantities. It serves as:

A sweetener in reduced-calorie and sugar-free food products
A flavour enhancer to mask or reduce bitter or unpleasant taste notes
An aroma modifier in chewing gums, confectionery, dairy products, and beverages
A taste-masking agent in pharmaceutical products to improve the palatability of medicines

Since thaumatin is a protein, it theoretically provides calories (4 kcal/g like all proteins), but because it is used in extremely small amounts, its caloric contribution in practice is negligible.

Safety and Regulation

Thaumatin is considered well-tolerated and safe. It is digested and metabolised in the body like any ordinary dietary protein. The European Food Safety Authority (EFSA) has classified thaumatin as a safe food additive. No maximum quantity restriction (quantum satis) has been established for certain food categories. However, individuals with protein allergies should exercise caution, as an allergic reaction is theoretically possible, although reports of thaumatin-related allergies are rare.

Benefits and Special Characteristics

Of natural origin – not a synthetic sweetener
Effectively calorie-free at practical usage levels
No glycaemic effect – suitable for people with diabetes
Acts as a flavour modulator and can mask bitter notes
Tooth-friendly – does not promote tooth decay

References

European Food Safety Authority (EFSA) - Re-evaluation of thaumatin (E 957) as a food additive. EFSA Journal, 2015.
Kant, R. - Sweet proteins: potential replacement for artificial low calorie sweeteners. Nutrition Journal, 2005.
Masuda, T. & Kitabatake, N. - Developments in biotechnological production of sweet proteins. Journal of Bioscience and Bioengineering, 2006.

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