Color Quality of Blackcurrant Syrups During Storage Evaluated by Hunter L', a', b'Values

摘要

ABSTRACTFree anthocyanin and Hunter a'value deterioration in blackcurrant syrups during storage followed fist order reaction kinetics. Half‐life of Hunter a'values were 3‐4 times higher than half‐life values of free anthocyanins. Syrups from various cultivars. differed in color stability. Degassing of syrups prior to storage did not enhance color stability. Day‐light storage of syrups lowered half‐life of Hunter a'values by 10‐30 compared with dark storage. Storage in oxygen permeable packaging materials reduced Hunter a'half‐life values up to 90. Hue values should be used rather than absorbance ratios A502A420to judge color quality. Hunter a'values should be above 50 and hue values below 40–45' to ascertain a