2.10. Colour density, polymeric colour and percentage polymeric
colour
The colour density (CD) of the water treated samples, polymeric
colour (an index of anthocyanin degradation) (PC) of the bisulfite
bleached samples and the percentage of polymeric colour were
analysed in triplicate using method proposed by Giusti and
Wrolstad (2001) with a slight modification.
Colour density (CD) was calculated using the control sample
according to the following formula:
CD ¼ ½ðA420 nm A700 nmÞ þ ðA512 nm A700 nmÞ
dilution factor ð4Þ
Polymeric colour (PC) was determined using the bisulfide –
bleached sample using the following formula:
PC ¼ ½ðA420 nm A700 nmÞ þ ðA512 nm A700 nmÞ
dilution factor ð5Þ
Percentage polymeric colour (% PC) was calculated using the
following formula:
%PC ¼ ðPolymeric Colour=Colour DensityÞ 100 ð6Þ2.10. Colour density, polymeric colour and percentage polymeric
colour
The colour density (CD) of the water treated samples, polymeric
colour (an index of anthocyanin degradation) (PC) of the bisulfite
bleached samples and the percentage of polymeric colour were
analysed in triplicate using method proposed by Giusti and
Wrolstad (2001) with a slight modification.
Colour density (CD) was calculated using the control sample
according to the following formula:
CD ¼ ½ðA420 nm A700 nmÞ þ ðA512 nm A700 nmÞ
dilution factor ð4Þ
Polymeric colour (PC) was determined using the bisulfide –
bleached sample using the following formula:
PC ¼ ½ðA420 nm A700 nmÞ þ ðA512 nm A700 nmÞ
dilution factor ð5Þ
Percentage polymeric colour (% PC) was calculated using the
following formula:
%PC ¼ ðPolymeric Colour=Colour DensityÞ 100 ð6Þ