The addition of ascorbic acid to juice samples has a stabi-
lizing effect in retaining betacyanin (Fig. 2). As for concen-
trate samples, ascorbic acid helps to stabilize betacyanin at the
agitated condition; whilst under non-agitated condition,
betacyanin in the concentrate sample was relatively stable
even in the absence of ascorbic acid (Fig. 2). Betacyanin
content of both juice and concentrate samples added with
0.25 % ascorbic acid and stored under non-agitated condition
were higher than those stored at the agitaion speed of 220 rpm
(p≤0.05) (Fig. 2). According to Reynoso et al. (1997), ascor-
bic acid has been used to counteract oxidation since it acts as
an oxygen scavenger in a closed system.