Description

2-(3,4-Dihydroxyphenyl)-2-((2-(3,4-Dihydroxyphenyl)-5,7-Dihydroxychroman-3-Yl)Oxy)Chroman-3,4,5,7-Tetraol CAS NO 20347-71-1 is a complex polyphenolic compound belonging to the condensed tannin or proanthocyanidin class. This compound is valued for its potent antioxidant properties and its role as a key structural unit in many natural oligomeric and polymeric flavonoids. It serves as a critical reference standard and research chemical for analytical laboratories and R&D departments focused on natural product chemistry, nutraceuticals, and phytopharmaceuticals.

Application

• Pharmaceutical Research & Development: Used as a high-purity reference standard for the identification, quantification, and method validation of proanthocyanidins and related polyphenols in drug discovery and herbal medicine quality control.
• Nutraceutical & Dietary Supplement Analysis: Essential for standardizing and assaying complex botanical extracts (e.g., grape seed, pine bark, green tea) in quality assurance laboratories to ensure product potency and consistency.
• Academic & Institutional Research: Employed in biochemical and pharmacological studies to investigate the mechanisms of action, bioavailability, and health benefits of condensed tannins, including their antioxidant, anti-inflammatory, and cardioprotective effects.
• Cosmeceutical Ingredient Research: Serves as a model compound for developing and testing advanced skincare formulations that leverage the anti-aging and protective properties of polyphenols against environmental stressors.
• Food & Beverage Science: Used in research related to the sensory properties (astringency, bitterness) and shelf-life extension of products like wine, chocolate, and fruits, where proanthocyanidins play a significant role.

Basic Information

Product Name	2-(3,4-Dihydroxyphenyl)-2-((2-(3,4-Dihydroxyphenyl)-5,7-Dihydroxychroman-3-Yl)Oxy)Chroman-3,4,5,7-Tetraol
CAS No.	20347-71-1
Molecular Formula	C₃₀H₂₂O₁₂
Molecular Weight	574.49 g/mol
Synonyms	Procyanidin B2; Procyanidol B2; Procyanidin B-2; Epicatechin-(4β→8)-epicatechin; Epicatechin-(4β-8)-epicatechin; (+)-Epicatechin-(4β→8)-(-)-epicatechin; Dimeric Procyanidin B2; [4,8]-Bi-(-)-epicatechin
EINECS	Contact for details

Quality Control

Our 2-(3,4-Dihydroxyphenyl)-2-((2-(3,4-Dihydroxyphenyl)-5,7-Dihydroxychroman-3-Yl)Oxy)Chroman-3,4,5,7-Tetraol is produced and handled under strict quality management systems. Each batch undergoes comprehensive analytical testing, including HPLC purity analysis, spectroscopic identification (UV, IR, MS), and specific optical rotation measurement, to ensure identity, potency, and consistency. Certificates of Analysis (COA) detailing all test results are provided with every shipment. We support compliance with cGMP, ISO, and relevant pharmacopeial guidelines for research materials.

Storage

Preserve in a tightly closed container, protected from light. Store at 2-8°C under an inert atmosphere (e.g., argon or nitrogen) to minimize oxidation. For long-term storage, desiccate at -20°C. The container should be kept in a cool, dry, and well-ventilated area away from incompatible materials.

Specification

Item	Specification
Appearance	Off-white to light brown powder
Identification (IR)	Conforms to reference spectrum
Identification (HPLC)	Retention time corresponds to reference standard
Purity (HPLC)	≥ 95.0%
Water Content (KF)	≤ 3.0%
Residue on Ignition	≤ 0.5%
Specific Optical Rotation	Contact for details

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.