138929.fig.001a
(a)
138929.fig.001b
(b)
138929.fig.001c
(c)
138929.fig.001d
(d)
138929.fig.001e
(e)
138929.fig.001f
(f)
Figure 1: Chemical structures of ascorbic acid and its derivatives: (a) ascorbic acid (ASA), (b) ascorbyl-2-glucoside (ASC-G), (c) ascorbyl-6-octanoate (ASC-8), (d) ascorbyl-6-palmitate (ASC-P), (e) ascorbyl-6-stearate (ASC-S), and (f) ascorbyl-2,6-dipalmitate (ASC-DP).