99-85-4

γ-Terpinene is a monoterpene that has been found in various plants, including C. sativa, with diverse biological activities. It scavenges 2,2''-diphenyl-1-picrylhydrazyl (DPPH; Item No. 14805) and 2,2''-azinobis(3-ethylbenzothiazoline-6-sulfonate) (ABTS⁺) free radicals (IC₅₀s = 2.8 and 30 mM, respectively) and reduces hemolysis induced by AAPH (Item No. 82235) in isolated human erythrocytes. γ-Terpinene reduces the growth of T. evansi in a concentration-dependent manner. It increases membrane permeability and decreases growth of X. oryzae bacteria. In vivo, γ-terpinene (100 mg/kg) reduces Triton WR1339-induced increases in serum cholesterol and triglyceride levels in rats. It reduces paw edema induced by histamine, bradykinin (Item No. 15539), carrageenan, and prostaglandin E₂ (PGE₂; Item No. 14010) in mice. It also inhibits fluid extravasation in a mouse model of acetic acid microvascular permeability and reduces neutrophil migration in lung in a mouse model of acute lung injury.

clear liquid

p-Mentha-1,4-diene has a characteristic lemon odor (not as lemony as the alpha-isomer, but warmer). It has a slightly bitter, herbaceous, citrus-like flavor; woody, terpene, tropical lemon odor.

γ-Terpinene is a colorless liquid with an herbaceous citrus odor and can be prepared by isomerization of limonene.

Reported found in papaya fruit, tea tree oil, tangerine, citrus, mandarins, Finocchoi fennel oil, papaya fruit, citrus peel oils, etc.

ChEBI: Gamma-terpinene is one of three isomeric monoterpenes differing in the positions of their two double bonds (alpha- and beta-terpinene being the others). In gamma-terpinene the double bonds are at the 1- and 4-positions of the p-menthane skeleton. It has a role as an antioxidant, a plant metabolite, a volatile oil component and a human xenobiotic metabolite. It is a monoterpene and a cyclohexadiene.

From geranyl pyrophosphate by migration of a positive-charge, hydrid shift from the isopropyl side chain into the cyclohexenoid ring; from the essential oil of Lantana camara; also from p-cymene by the action of sodium and alcohol in liquid ammonia.

Taste characteristics at 40 ppm: terpy, citrus, limelike, oily, green with a tropical fruity nuance.

Flammable

Combinations of terpenes, such as terpinene, with nonionic surfactants and stabilizers have been patented for use as gallstone solvents. Artificial or human cholesterol calculi placed in terpinene with or without human bile at 37°C were dissolved within 1-2 hr (Hisamitsu Pharmaceutical Co., Inc., 1973).

[1] GUO-XIANG LI  Zai Q L. Unusual Antioxidant Behavior of α- and γ-Terpinene in Protecting Methyl Linoleate, DNA, and Erythrocyte[J]. Journal of Agricultural and Food Chemistry, 2009, 57 9: 3943-3948. DOI: 10.1021/jf803358g
[2] MATHEUS D. BALDISSERA . In vitro and in vivo action of terpinen-4-ol, γ-terpinene, and α-terpinene against Trypanosoma evansi[J]. Experimental parasitology, 2016, 162: Pages 43-48. DOI: 10.1016/j.exppara.2016.01.004
[3] KAYO YOSHITOMI . Rice terpene synthase 24 (OsTPS24) encodes a jasmonate-responsive monoterpene synthase that produces an antibacterial γ-terpinene against rice pathogen[J]. Journal of plant physiology, 2016, 191: Pages 120-126. DOI: 10.1016/j.jplph.2015.12.008
[4] YASUO TAKAHASHI. Effects of gamma-terpinene on lipid concentrations in serum using Triton WR1339-treated rats.[J]. Bioscience, Biotechnology, and Biochemistry, 2003, 67 11: 2448-2450. DOI: 10.1271/bbb.67.2448
[5] THERESA RAQUEL DE OLIVEIRA RAMALHO. Gamma-Terpinene Modulates Acute Inflammatory Response in Mice.[J]. Planta medica, 2015, 81 14: 1248-1254. DOI: 10.1055/s-0035-1546169