| dc.description.abstract | Dragon fruit is a popular fruit in the world, especially in tropical area (Vietnam included).
Dragon fruit peels seems to be a waste in industry, but the peels contain lot of pectin that
could be used in some industries, such as food industry, pharmaceuticals, beauty industry,
In the project, we investigated three methods to extract pectin: heating-assisted method,
microwave-assisted method and ultrasound-assisted method and each method we used
different treatment durations to find out which time could obtain the most pectin. The
result showed that in the heating-assisted method, 120-minute treatment gave the
highest amount of pectin with 1.81%. The ultrasound-assisted method gives the highest
amount of pectin at 60 minutes with 1.516% of pectin yields. Among three methods, the
microwave-assisted method provided the highest pectin yield, around 3.872%. All three
methods share the same trend is that the percentage of pectin yield increase over time.
The pectin obtained from ultrasound- and microwave-assisted methods had higher
moisture contents (12.107% and 10.180% respectively) but comparable ash content. In
color measurement test, heating-assisted method has lightest color as well as the redness
and yellowness (L:87.174; a:4.753; b:21.494). FTIR indicated that all the pectins obtained
from three methods had characteristic peaks of pectin. | en_US |
