| dc.description.abstract | This work aimed to investigate the effect of dilution ratio, salt addition,
ultrasound treatment (temperature and duration), and centrifugal force on oil
yield in the ultrasound-assisted centrifugal separation (UACS) method for oil
extraction from fresh avocado pulp. The best condition of each factor was chosen
by measuring the highest oil yield and considering time & cost savings.
Specifically, the parameters were selected in a range of 9:1-27:1 (w/w) of
water:solid ratio; 5-25% (w/w paste) of salt concentration; 35-75oC of ultrasonic
temperature; 10-40 mins of ultrasonic duration; and 4000-8000 rpm of
centrifugal force. As a result, the highest oil yield was 39.2±0.35% (d.b.) under
dilution ratio (18:1), CaCO3 (15%), ultrasound treatment (55oC, 25 mins), and
centrifugal force (8000 rpm). Meanwhile, the Soxhlet extraction method was
used as a control to find the oil yield capacity of the fruit and compare it to the
UACS method. The physicochemical characteristics of UACS oil were as follows:
free fatty acid value (0.7±0.00%), peroxide value (4.82±0.28 meq O2/kg oil),
saponification value (188.65±1.03 mg KOH/g oil), iodine value (80.32±0.23 g
I2/100g oi), and total phenolic content (78.6±3.9 mg GAE/100g oil). Hence, this
avocado oil is preferred in non-drying products, cosmetics, drugs, or soap. | en_US |
