In the present study short PLexposure times (2 or 4 s) caused no changes in the measuredquality attributes of apple juice. In a study performed by Kasaharaet al. (2004) on clarified apple juice, exposure to pulsed UV light atdifferent energy dosages (from 1850 to 3354 mJ/cm2) did not causesignificant differences from the control sample in terms of solublesolids, turbidity, acidity, viscosity and colour. However instrumentalcolour measurement also performed in the present study,revealed a slightly noticeable (0.5 < DE <1.5 (Cserhalmi et al.,2006)) total colour difference was found in the apple juice processedby PL, regardless of the exposure time.
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