2.5.2. Surface oil (SO) and encapsulation efficiency (EE)
The SO was measured on 500 mg of powder contained in a filter
paper, at room temperature, by adding twice 30 mL of petroleum
ether for 2 min and 30 s, respectively. The solution containing the extracted
oil was transferred to a clean flask, which was left to evaporate
and then was dried at 60 °C until constant weight was reached. The
SO weight was calculated based on the difference between that of the
clean flask and that of the flask containing the extracted oil residue.
Total oil was assumed to be equal to the initial oil, since preliminary
tests revealed that all the initial oil was retained.
The EE was obtained by indirect measurement from VO-retention
level in the powders, and was calculated by means of the following
equation:
EE ¼ ðTO−SOÞ=TO 100
2.5.2. Surface oil (SO) and encapsulation efficiency (EE)The SO was measured on 500 mg of powder contained in a filterpaper, at room temperature, by adding twice 30 mL of petroleumether for 2 min and 30 s, respectively. The solution containing the extractedoil was transferred to a clean flask, which was left to evaporateand then was dried at 60 °C until constant weight was reached. TheSO weight was calculated based on the difference between that of theclean flask and that of the flask containing the extracted oil residue.Total oil was assumed to be equal to the initial oil, since preliminarytests revealed that all the initial oil was retained.The EE was obtained by indirect measurement from VO-retentionlevel in the powders, and was calculated by means of the followingequation:EE ¼ ðTO−SOÞ=TO 100
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