Table 3.

Polyphenols degradation rate constants (k [1/day]) at 37 °C in matrixes of strawberry extract and purified molecules in citric buffer pH = 3, 50 mM.

Polyphenol	Strawberry Extract (k [1/day])	Purified (k [1/day])
Pelargonidin-3-O-glucoside	0.27 ± 0.01 A	0.0091 ± 0.0006 A
Cyanidin-3-O-glucoside	0.25 ± 0.02 A, B	0.019 ± 0.004 B
Pelargonidin-3-O-rutinoside	0.22± 0.01 B	0.009 ± 0.001 A
Kaempferol-3-O-glucuronide	0.030 ± 0.008 C	0.0015 ± 0.0005 C
Quercetin-3-O-glucuronide	0.04 ± 0.02 C	0.008 ± 0.001 A,B

* Different capital letters represent differences between structurally different polyphenols in columns.