W355801 Sigma-Aldrich


≥89%, FCC, FG

Synonym: 1-Isopropyl-4-methyl-1,3-cyclohexadiene, p-Mentha-1,3-diene

  • CAS Number 99-86-5

  • Empirical Formula (Hill Notation) C10H16

  • Molecular Weight 136.23

  •  FEMA Number 3558

  •  Beilstein Registry Number 1853379

  •  Council of Europe no. 11023

  •  MDL number MFCD00001534

  •  PubChem Substance ID 24901781

  •  Flavis number 1.019



Related Categories A-D, Alphabetical Listings, Certified Food Grade Products, Flavors and Fragrances, Follows IFRA Guidelines,
biological source   synthetic
grade   FG
  follows IFRA guidelines
reg. compliance   EU Regulation 1223/2009
  FDA 21 CFR (172.515)
  EU Regulation 1334/2008 & 178/2002
assay   ≥89%
refractive index   n20/D 1.478(lit.)
bp   173-175 °C(lit.)
solubility   95% ethanol: soluble 1ml/2ml, clear, colorless
density   0.837 g/mL at 25 °C(lit.)
Documentation   see Safety & Documentation for available documents
Organoleptic   lemon; medicinal; woody; citrus
food allergen   no known allergens
fragrance allergen   no known allergens


Biochem/physiol Actions

Odor at 10%

Taste at 10 ppm

Other Notes

Natural occurrence: Celery, corriander, fennel, grapefruit, lemon, lime, orange and mandarin oils, nutmeg, oregano, black pepper and Scotch spearmint.

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1 kg in glass bottle

4 kg in steel drum

8 kg in composite drum


α-Terpinene (1-Isopropyl-4-methyl-1,3-cyclohexadiene, p-Mentha-1,3-diene) has been used in a study to evaluate the antifungal properties of Melaleuca alternifolia essential oil (tea tree oil, TTO). It was identified as one of the principal component of the essential oil of M. alternifolia.

General description

α-Terpinene (1-isopropyl-4-methyl-1,3-cyclohexadiene, TER) is a monoterpene found in various plant volatile oils. It is commonly employed as flavoring additive in foods and beverages, as fragrance in cosmetics, and as scent in household products. Embryofoetotoxic potential of TER in the rat has been reported. It is also useful in the preparation of folk medicine potions. It is one of the major component of the essential oil of Melaleuca alternifolia. It reacts with singlet oxygen to form the endoperoxide, ascaridole along with p-cymene and hydroperoxides.

Protocols & Articles


Securing a Traceable Supply Chain for Food Grade Flavor Ingredients

Introduction Defining "Food Grade" Understanding "Food Grade" Versus "Industrial Grade" Top Questions to Ask a Flavor & Fragrances Supplier The Sigma-Aldrich Approach
Dr. Luke Grocholl
Quality Assurance Supervisor, Sigma-Aldrich Flavors & Fragrances
Keywords: Food & Beverage, Food Safety, Solvents

Understanding the Complexities of Kosher Ingredients

Introduction What is Kosher Product Considerations for Kosher Certification Kosher's Added Benefit to the Food Industry Sigma-Aldrich's Kosher Experience and Offering
Dr. Luke Grocholl1, Rabbi Gershon Segal

1Dr. Luke Grocholl, Quality Assurance Supervisor, Sigma-Aldrich Flavors & Fragrances
Keywords: Fermentation, Food & Beverage, Safety industry

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Keywords: Allergens, Food Safety, Solvents

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