Polyvinylalcohol (mg/solid phase)

Solid phase

0

0.25

1.25

3.75

Residual anthocyanin (% of total anthocyanin)

Cotton swab^®

40.2 ± 2.2

45.6 ± 1.4

62.7 ± 3.8*

66.9 ± 3.5*

Inert polymer

Polypropyrene membrane

44.5 ± 2.8

67.2 ± 6.8

80.0 ± 4.4*

87.2 ± 9.0*

Bell oasis^®

53.8 ± 7.8

87.3 ± 9.5

97.9 ± 6.8*

101.7 ± 14.3*