5-TAMRA Azide (TAMRA Azide, isomer 5) is the orange-fluorescent probe that is compatible with various excitation sources including mercury arc, tungsten and xenon arc lamps, the 544 nm line of the Helium-Neon laser and the 532 nm green laser line. It is predominantly used for detection of terminal alkyne-tagged biomolecules via a copper-catalyzed click reaction (CuAAC).

Instructions:
I. Solution preparation
1. Stock solution: Dissolve 5-TAMRA Azide in anhydrous DMSO or DMF to prepare a 1–10 mM stock solution. The specific concentration can be adjusted according to experimental requirements.
Notes:
Powder: Store at -20°C in a dark, dry environment.
Solution: Store at -20°C in a dark environment after aliquoting to avoid repeated freezing and thawing.
II. Click Chemistry labeling
5-TAMRA Azide is a fluorescent labeling molecule commonly used in click chemistry reactions. It can react with molecules containing azide or alkyne groups to generate stable triazole bonds.
1. Reaction conditions:
1) Reaction buffer: Amine-free buffer (such as PBS or Tris-HCl) with a pH of 6.8–8.5 is usually used.
2) Catalyst system: Add Cu(I) catalysts (such as CuSO₄ and ascorbic acid) and stabilizers (such as triethylamine or TBTA) to accelerate the reaction.
3) After mixing, react at room temperature or with slight heating (37°C) for 1–2 hours.
2. Purification:
Remove unbound 5-TAMRA Azide and byproducts by dialysis, gel filtration or HPLC.
Notes
Operation in dark room: 5-TAMRA Azide is light sensitive and should be handled and stored in a dark room or in dark conditions.
Choice of copper catalyst: Use high-purity Cu(I) catalyst to avoid excessive byproducts in the reaction.
Fresh preparation: It is recommended to prepare it before use to ensure reaction efficiency.

The above information is based on published literature. Experimental procedures should be appropriately modified to meet specific research demands.