Phenylgalactoside, inozivikanwawo se p-nitrophenyl β-D-galactopyranoside (pNPG), is a synthetic substrate inowanzoshandiswa muzvidzidzo zvebiochemical uye molecular biology.Inowanzoshandiswa kuona uye kuyera basa re enzyme β-galactosidase.
Kana phenylgalactoside iine hydrolyzed ne β-galactosidase, inoburitsa p-nitrophenol, iri musanganiswa weruvara rweyero.Kusunungurwa kwep-nitrophenol kunogona kuyerwa muhuwandu uchishandisa spectrophotometer, sezvo kunyura kwep-nitrophenol kunogona kuonekwa paurefu hwe405 nm.