2.6. Colour measurement, determination of total soluble solids and
pH
The CIELab values of purees were measured with a
R. Bobinaite et al. / LWT - Food Science and Technology 66 (2016) 460 _ e467 461spectrophotometer MiniScan XE Plus (Hunter Associates Laboratory, Reston, Virginia). The recorded X, Y and Z tristimulus values
were converted to CIE L* (lightness), a* (redness(þ)/greenness())
and b* (yellowness(þ)/blueness()) colour values. The chroma (C)
(1.1), hue angle (h) (1.2) and the total colour difference (DE) (1.3)
between purees without extract (control) and with different percentages of extract additive were calculated using formulae;