where DC (=(a − a0)2+ (b − b0)2) is the chroma change,DCmaxis the asymptotic value of DC observed after a period ofstorage, DC0at zero time, a0and b0the values of a and b colourparameters at zero time, kcolis the colour change rate at tem-perature T. Chroma change for pre-treated with glucose, HDM,and oligofructose strawberry samples at all temperaturesstudied is representatively shown in Fig. 3, respectively. Colourmeasurements indicated that colour change of untreatedfrozen strawberry samples was more intense than the changeof colour of pre-treated samples. Indeed, the degradation rates(kcol) of Eq. (3) for the pre-treated strawberry samples werelower than the corresponding rates for the untreated, show-ing the protection provided by the application of the osmoticprocedure prior to freezing (values for apparent reaction ratesof colour change kcol, are given in Table 1). Statistical anal-ysis (ANOVA), as well as the Duncan HSD test (a = 0.05), that