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How stable is Streptavidin?   How should I store it?

ProZyme warrants that Streptavidin will be stable for one year if the lyophilizate is stored at 20°C.  Because the lyophilizate is ~10% NaCl, we suggest that the customer dissolve it  and measure it using its extinction coefficient  {E₂₈₀(1%) = 32} rather than weighing it.

Aliquots may be stored at -20°C for long periods.  If kept refrigerated, an antimicrobial agent such as 0.05% sodium azide should be added to retard growth and subsequent proteolysis from exogenous enzymes.

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