Phenol Red Powder(Phenolsulfonphthalein) Bioreagent, Powder

Catalog Number: ASC-1005

CAS Number: 143-74-8

MW: 354.38 gr/mol

MF: C19H14O5S

Phenol Red Powder is a pH indicator commonly used in laboratory applications, particularly in cell culture and microbiology studies. It transitions from yellow in acidic conditions (pH <6.8) to red in neutral to basic conditions (pH >8.2). This makes it an essential tool for monitoring pH in culture media, helping researchers and clinicians maintain optimal growth conditions for cells and microorganisms. Phenol Red is also used in diagnostic and analytical applications. Available in convenient powder form for laboratory use.

Phenol Red Powder

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Technical Data Sheet

Cat. Number	ASC-1005
CAS Number	143-74-8
MDL Number	MFCD00003552
Pubchem	310278714
Molecular Weight	354.38 gr/mol
Molecular Formula	C19H14O5S
Storage Temperature	20 °C
Form and Color	Powder / Red to dark red
Solution Appearance	1 % in 95 % ethanol / clear golden solution
Solubility	Soluble in water, ethanol, methanol and insoluble in chloroform.
pH Transition Range	6.8 (Brownish yellow) – 7 (Orange) – 8.2 (red violet)
Wavelength of Maximum Absorption	430 – 435 nm (pH 6.5)
Wavelength of Maximum Absorption	557 – 560 nm (pH 8.2)
Absorptivity (E1%, 1cm cell)	600 – 700 (pH 6.5)
Absorptivity (E1%, 1cm cell)	1100 – 1200 (pH 8.2)
Loss on Drying	≤ 5 %
Synonym	Phenolsulfonephthalein;3,3-Bis(p-hydroxyphenyl)-2,1-3H-benzoxathiole