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Effect of Different Pre-Treatment to Increase the Stability of Anthocyanin<br />

Extract from Purple Sweet Potato during Storage<br />

Nurnasiha Binti Ramlan<br />

Supervisor: Dr. Azlin Shafrina Binti Hasim<br />

Bachelor of Food Science (Food Technology)<br />

School Of Food Science and Food Technology<br />

Purple sweet potato (PSP) have been commonly used as natural food colourant with<br />

present of high acylated anthocyanin concentrations. However, anthocyanin are<br />

susceptible towards degradation under certain factors such as pH, light intensity,<br />

temperature and oxygen. Sucrose can increase the stability of anthocyanin by lowering<br />

its water activity and through inhibition of the enzymatic reaction. Therefore, the<br />

objective of this study are to extract anthocyanin from PSP using different pre-heating<br />

treatment (roasting, steaming, boiling) and to compare its stability with different<br />

concentration of sucrose (20% and 40%) during 14 days of storage at 4 °C under dark.<br />

The total polyphenol content, total anthocyanin, DPPH activity, FRAP assay and total<br />

flavonoid content will be measured every 2 days. It is expected that, pre-heating<br />

steaming process of PSP with the addition of 20% of sucrose is great to increase the<br />

stability of anthocyanin extract compare to boiling and roasting process.<br />

1282 | UMT UNDERGRADUATE RESEARCH DAY

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