Abstract: The present invention, provides natural-source compositions having consistent, effective antibrowning and antioxidant characteristics. Additionally, the present invention provides methods for making the antibrowning/antioxidant compositions of the present invention. More specifically, the present invention provides natural-source, browning and oxidizing inhibitor compositions comprising S-sinapyl-L-cysteine, N-L-&ggr;-glutamyl-S-sinapyl-L-cysteine, S-sinapyl glutathione, or various mixtures thereof. Methods for making such natural, antibrowning/antioxidant compositions from pineapple juice and/or from pineapple processing plant waste streams include efficient and effective separation of the present invention compositions from unwanted sugars, acids, phenolic compounds, and other undesirable compounds present in pineapple juice and/or pineapple processing plant waste streams.

Abstract: A natural, red-hue colorant that is substantially free of alkaloids and polyphenoloxidase, has good stability, minimal aroma, and does not contain any organic solvent residuals is provided. The natural colorant has a red-hue equivalent to the red-hue of FD&C Red No. 40 and is more stable as compared to existing natural colorants. Methods for extracting anthocyanin pigments from red-fleshed potatoes without use of an organic solvent, while essentially eliminating alkaloids and polyphenoloxidase from the extract are also provided. Potatoes are pressed and filtered and the filtrate (i.e., potato juice containing potato anthocyanin pigments) is concentrated. The pH of the concentrate is adjusted with alkali to precipitate alkaloids therein. The concentrate is filtered and the pH of the filtrate is adjusted to a pH value of about 3.5 or lower. The pH is adjusted in such a manner to obtain a colorant having the desired red-hue color and intensity (i.e.