Rumenic acid

CAS Number
2540-56-9

What is Rumenic acid?

Rumenic acid (CAS 2540-56-9), also commercially referenced as cis-9,trans-11-CLA, is the predominant naturally occurring isomer of conjugated linoleic acid found in ruminant-derived dairy and meat fats.

Where is Rumenic acid used?

  • Nutritional, feed and functional food: bioactive fatty acid ingredient where specific CLA isomer identity is a formulation requirement
  • Dietary supplements: authenticated natural CLA isomer rather than synthetic blends, supporting label differentiation in softgel and encapsulated formats
  • Functional food: fortified dairy analogues, spreads and nutritional bars targeting defined CLA content claims
  • Animal nutrition: feed additive evaluated to influence milk fat composition and body condition in dairy cattle
  • Pharmaceutical and nutraceutical research: reference standard or active ingredient for clinical use

Commercial specifications

  • Purified liquid or oil; high-purity research and commercial grades with isomer content specified by percentage
  • Food-grade and feed-grade specifications; purity commonly 90% to 95%+ isomer concentration
  • Packaging in small quantities for research use and bulk formats for industrial formulators

Other Names (Synonyms)

cis-9,trans-11-CLA|cis-9,trans-11 conjugated linoleic acid|cis-9, trans-11-octadecadienoic acid|C18:2, n-7,9 trans,cis|9Z,11E-octadecadienoic acid|9Z,11E-CLA|9,11-cis,trans-octadecanoic acid|9-cis-11-trans-linoleic acid

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What are the physical properties of Rumenic acid?

Boiling Point 381.6±11.0 °C(Predicted)
Density 0.911±0.06 g/cm3(Predicted)
Color Colorless to light yellow
Form neat
Refractive Index n20/D1.481

Which trade and regulatory codes apply to Rumenic acid?

UN Number 1230
ADR Class 3
Packing Group II
Storage Class 10 - Combustible liquids
WGK (Germany) 3
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