ATTO 620 Biotin Fluorescent Label 1 mg

Optical properties

• λ _abs = 620 nm
• ε _max = 1.2×10⁵ M ^-1 cm ^-1
• λ _fl = 642 nm
• n _fl = 50 %
• τ _fl = 2.9 ns
• CF ₂₆₀ = ε ₂₆₀ /ε _max = 0.04
• CF ₂₈₀ = ε ₂₈₀ / ε _max = 0.06

ATTO 620 belongs to a new generation of fluorescent labels for the red spectral region. Characteristic features of the label are strong absorption, temperature dependent fluorescence, and high thermal and photo-stability.

In common with most ATTO-labels, absorption and fluorescence are independent of pH, at least in the range of pH 2 to 11, used in typical applications. ATTO 620 is a cationic dye. After coupling to a substrate the label carries a net electrical charge of +1

The label is moderately hydrophilic. Its fluorescence is excited most efficiently in the range 600 - 630 nm.