Phenolphthalin [for redox indicator] TCI P0095

Chemical Identity

CAS No.: 81-90-3
PubChem: CID 66494·SID 87574354
Formula: C20H16O4
Molecular weight: 320.3 g/mol
Purity: >98.0%(HPLC)(T)
Reference databases: ChEBI·ChemSpider·ECHA

Full identifiers (IUPAC, SMILES, InChIKey)

IUPAC: 2-[bis(4-hydroxyphenyl)methyl]benzoic acid
SMILES: C1=CC=C(C(=C1)C(C2=CC=C(C=C2)O)C3=CC=C(C=C3)O)C(=O)O
InChIKey: FFFPYJTVNSSLBQ-UHFFFAOYSA-N

Rp 1.298.850,00

Sale Sold out

Shipping calculated at checkout.

Berat 25g

Pembayaran hanya melalui request quotation dan dilakukan setelah tim kami menghubungi Anda. Mohon cantumkan nomor WhatsApp aktif untuk konfirmasi pesanan & pembuatan invoice. Estimasi pengiriman 2-4 minggu setelah pembayaran.

Dokumen Keamanan & Mutu

↓ Unduh SDS / MSDS (PDF resmi TCI)

CoA (Certificate of Analysis)

Spesifik per batch produksi — diterbitkan dan dikirim bersama barang sesuai nomor lot yang Anda terima.

Contoh CoA segera tersedia.

💬 Minta CoA via WhatsApp

View full details

Phenolphthalin [for redox indicator] from TCI (product code P0095) is the reduced form of phenolphthalein. Its structure is almost the same as phenolphthalein's, but it lacks the conjugated system that produces colour, so the compound itself is colourless. When oxidised, phenolphthalin converts back to phenolphthalein, which turns pink under alkaline conditions. Analytical laboratories therefore use it as a redox indicator to detect oxidising agents or peroxidase-like catalytic activity in a sample.

Laboratories choose this reagent because its colour change is very distinct: it goes from colourless to bright pink, which is easy to see by eye without special instruments. Haem groups, together with hydrogen peroxide, can catalyse its oxidation. This principle underlies the presumptive blood test known as the Kastle-Meyer test. TCI supplies this phenolphthalin specifically for redox indicator work, so its quality suits analytical tasks that need a clear and repeatable colour response from one run to the next.

In Indonesia, phenolphthalin is useful for analytical chemistry, forensic, biochemistry and chemistry education laboratories. Lecturers and laboratory staff can use it to demonstrate redox reactions and the link between chemical structure and colour in practical classes. Forensic and research laboratories can use it for presumptive screening that relies on peroxidase-like activity. AMI Scientific supplies this TCI reagent to universities, research institutions and testing laboratories that need a dependable titration and indicator reagent for routine and educational work.

Related TCI products

Redox indicator work: the colourless reduced form turns into pink phenolphthalein when oxidised, which gives a clear visual signal that an oxidising agent is present in the tested solution.
Kastle-Meyer presumptive blood testing: haem groups and hydrogen peroxide catalyse the oxidation of phenolphthalin, so this reagent is the basis of this well-known forensic screening method.
Detecting peroxidase-like catalytic activity: the reaction responds to catalytic oxidation, so biochemistry laboratories can use it to show peroxidase-like behaviour in samples or model systems.
Chemistry education and practical classes: the sharp change from colourless to bright pink lets lecturers show students redox chemistry and the role of conjugated systems in colour.
Routine analytical checks that need a visual endpoint: the colour response is clear and repeatable, so analysts can judge results by eye without spectrophotometers or other special instruments.

Brand	TCI (product code P0095)
CAS number	81-90-3
Molecular formula	—
Purity	—
Category	Analytical Chemistry > Analytical Reagents > Titration Reagents
Pack sizes	see the pack sizes listed on the product page
Physical form	refer to the TCI product label and Safety Data Sheet (SDS)
Storage	—

Grade/intended use: for redox indicator

Keep phenolphthalin in its original, tightly closed container in a cool, dry, well-ventilated place, away from direct sunlight and heat. Because the compound turns coloured when oxidised, keep it away from oxidising agents and peroxides so that it does not degrade or give false positive results. Label the container clearly and keep it away from incompatible chemicals. Handle it following good laboratory practice: wear gloves, safety glasses and a lab coat, avoid creating or breathing in dust, and wash your hands after use. Always check the TCI Safety Data Sheet for specific storage temperatures, hazards and disposal instructions before use.

—