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Table 2 Visual observation of self- nanoemulsification grades

From: Oral solid self-nanoemulsifying drug delivery systems of candesartan citexetil: formulation, characterization and in vitro drug release studies

Grade Time required for nanoemulsion formation Appearance
A Within 1 min Clear or slightly bluish
B Within 1 min Bluish white
C Within 2 min Bluish white, similar in appearance to milk
D Longer than 2 min Dull, ash emulsion, slightly oily appearance
E Longer than 2 min Poor or minimal emulsification, large oil droplets present on the surface