Fig. 3. Changes in ascorbic acid content of asparagus stored at 2 ◦C for 35 days. Each
data point is the mean of three replicate samples. Vertical bars represent standard
deviation of means.
favored by the presence of O2, the incorporation of chitosan to coating
formulations may reduce O2 diffusion, slow down the ripening
rate, and consequently better maintain ascorbic acid content and
delay senescence of asparagus.
3.3. Effect of chlorophyll
Chlorophyll, the pigment that makes green asparagus green, is
the fat soluble and sensitive to acids. A significant loss of chlorophyll
content was observed during the storage period in control
samples compared to chitosan treatment samples (Fig. 4). From
the appearance of all of the asparagus samples, the green was
gradually discolored during the storage. Subsequently, asparagus
samples turned to light yellow while the total chlorophyll content
was under 40.00 mg/100 g FW after 28 days. However, to the extent,
chitosan coating can retard the loss of total chlorophyll content
of green asparagus. At the 35th day, the total chlorophyll content
of 0.25% H-chitosan coated green asparagus was 40.15 mg/100 g
FW, and 0.50% L-chitosan coated was 38.96 mg/100 g FW. Whereas
Fig. 3. Changes in ascorbic acid content of asparagus stored at 2 ◦C for 35 days. Each
data point is the mean of three replicate samples. Vertical bars represent standard
deviation of means.
favored by the presence of O2, the incorporation of chitosan to coating
formulations may reduce O2 diffusion, slow down the ripening
rate, and consequently better maintain ascorbic acid content and
delay senescence of asparagus.
3.3. Effect of chlorophyll
Chlorophyll, the pigment that makes green asparagus green, is
the fat soluble and sensitive to acids. A significant loss of chlorophyll
content was observed during the storage period in control
samples compared to chitosan treatment samples (Fig. 4). From
the appearance of all of the asparagus samples, the green was
gradually discolored during the storage. Subsequently, asparagus
samples turned to light yellow while the total chlorophyll content
was under 40.00 mg/100 g FW after 28 days. However, to the extent,
chitosan coating can retard the loss of total chlorophyll content
of green asparagus. At the 35th day, the total chlorophyll content
of 0.25% H-chitosan coated green asparagus was 40.15 mg/100 g
FW, and 0.50% L-chitosan coated was 38.96 mg/100 g FW. Whereas
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