As with the total phenolic content, the total flavonoid content of broccoli samples increased with UV dose, but decreased with
prolonged storage (Table 3). The initial total flavonoid content for heads raised under 16.4 kJ/m2 UV was 0.27 mg CE/g DM. This value decreased to 0.24 mg CE/g DM after 60 days of storage. UV treatment slightly increased total phenolic and flavonoid contents of the samples, this increase was clearest under high UV levels