pHast Conjugates are one of our pHastest tools for quantitative testing of your primary antibody‚Äôs specificity, binding, and internalization, providing results in 1 day.

Fluorescence intensity increases over time, indicating internalization of the pHast conjugate. Data generated using an IncuCyte SX5.

How It Works

The pHast conjugate binds to your primary antibody via a secondary antibody cross-linked to a pH-dependent fluorescent reporter.  This fluorescent reporter will increase intensity as the pH of its surroundings becomes more acidic, as evident when exposed to the environment inside a cell.  pHast conjugates are fluorescent plate reader compatible and can be used to illuminate your lead antibody candidates in a 96-well plate format.


Also Available:

Streptavidin-pHast (PH-03)

Streptavidin-pHast binds to your biotinylated protein and contains a pH-dependent fluorescent reporter (pHast). 

TargetRecommended Products
made with whole IgG
made with
monovalent (Fab)
made with monovalent
Fc region (FabFc)
alpaca/llama IgG
(VHH domain)
Alpaca-pHast
(PH-05)
chicken IgYChick-pHast
(PH-06)
goat IgGGoat-pHast
(PH-07)
guinea pig IgGgPIG-pHast
(PH-08)
human IgGHum-pHast
(PH-09)
Fab-pHast human
(PH-01)
FabFc-pHast human
(PH-10)
human IgMHug-M-pHast
(PH-11)
FabFc-pHast Hug-M
(PH-04)
mouse IgGMab-pHast
(PH-12)
Fab-pHast mouse 
(PH-02)
FabFc-pHast mouse
(PH-13)
mouse IgMAnti-M-pHast
(PH-14)
rabbit IgGRab-pHast
(PH-15)
Fab-pHast rabbit 
(PH-16)
rat IgGRat-pHast
(PH-17)
Fab-pHast rat 
(PH-18)
FabFc-pHast rat
(PH-19)

made with bivalent
antibodies that
recognize the whole IgG

made with monovalent
(Fab) antibodies that
recognize the whole IgG,
without bivalent capping

made with monovalent
(Fab) antibodies that
recognize Fc region only

View a complete product listing here.

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