Our Answer
Sulfur dioxide and several forms of inorganic sulfites that release sulfur dioxide when used as food ingredients, are known collectively as “vegetable fresheners” or “whitening agents”. Because some of us are sensitive to sulfites, McDonald’s South Africa (SA) try to avoid using it and refrain from using any sulfur-based potato whitener. However, potatoes are high in moisture and, like apples, when they are cut, oxidation occurs. This leads to the surface turning brown (apples) or gray (potatoes). To prevent discolouration, our supplier adds an ingredient called sodium acid pyrophosphate (SAPP). It is a food grade additive used in various food products, including bakery and canned goods.
