Terpineol

Effect of citral, eugenol, nerolidol and alpha-terpineol on the ultrastructural changes of Trichophyton mentagrophytes.[Pubmed: 19345255 ]

Fitoterapia. 2009 Jul;80(5):290-6.

The antifungal effects of citral, eugenol, nerolidol and alpha-Terpineol on Trichophyton mentagrophytes were investigated.
METHODS AND RESULTS:
Citral over 0.1 mg/ml strongly inhibited the hyphal growth of T. mentagrophytes, and the antifungal activity of alpha-Terpineol was less effective. The morphological changes of the fungus exposed to the terpenes were observed by electron microscopy. The hyphae were distorted and collapsed at 0.2, 0.4 and 1 mg/ml of eugenol, nerolidol and alpha-Terpineol respectively, and cell membrane and organelles were irreversibly damaged at 0.2 mg/ml citral.
CONCLUSIONS:
These suggested that four terpenes possess antifungal activity against T. mentagrophytes, and the activity might lead to irreversible cellular disruption.

Antimicrobial effect of linalool and α-terpineol against periodontopathic and cariogenic bacteria.[Pubmed: 22537719 ]

Anaerobe. 2012 Jun;18(3):369-72.

METHODS AND RESULTS:
Linalool and α-Terpineol exhibited strong antimicrobial activity against periodontopathic and cariogenic bacteria. However, their concentration should be kept below 0.4 mg/ml if they are to be used as components of toothpaste or gargling solution.
CONCLUSIONS:
Moreover, other compounds with antimicrobial activity against periodontopathic and cariogenic bacteria should be used in combination.

Evolution of the Anticonvulsant Activity of α-Terpineol[Reference: WebLink]

Pharmaceutical Biology, 2007 , 45 (1) :69-70.

α-Terpineol, a monoterpenoid alcohol, was investigated for its anticonvulsant activity.
METHODS AND RESULTS:
This compound increased the latency to convulsions induced by pentylenetetrazole at doses of 100 and 200 mg/kg and decreased the incidence of hindlimb extension produced by MES in a dose-related manner at doses of 200 and 400 mg/kg.

Characterization of alpha-terpineol as an anti-inflammatory component of orange juice by in vitro studies using oral buccal cells.[Pubmed: 17867636 ]

J Agric Food Chem. 2007 Oct 3;55(20):8040-6.

METHODS AND RESULTS:
Epithelial buccal cells (KB) were exposed to orange juice or orange juice fractions containing either the dry matter (DM), the volatile compounds (aqueous distillate, AD), or individual nonvolatile or volatile components. Intracellular formation of the pro-inflammatory cytokine IL-6 was analyzed by flow cytometry. Exposure to whole orange juice resulted in an increase in IL-6 formation of 23% compared to nontreated control cells, whereas treatment of the cells with either DM or AD resulted in a 22 or 1% increase, respectively. Dose-response experiments revealed that exposure of the cells to a 2- or 4-fold concentrated AD resulted in an increased IL-6 formation, whereas an inhibiting effect was measured after treatment of the cells with an 8-fold concentrated AD. These results indicated the presence of pro- as well as anti-inflammatory compounds in the aqueous distillate. To identify the active principles, volatile compounds present in the AD-treated cells were analyzed by GC-MS. In particular, limonene, linalool, and alpha-Terpineol were shown to be present in significant amounts. Subsequent studies on the IL-6 formation revealed that limonene had a stimulating effect and alpha-Terpineol had an inhibiting effect, whereas linalool had no effect.
CONCLUSIONS:
This anti-inflammatory effect of alpha-Terpineol on IL-6 formation was verified by quantitative real-time reverse transcription Polymerase Chain Reaction experiments in which alpha-Terpineol inhibited the gene expression of the IL-6 receptor.

Synergistic Effect and Mechanism of Cineole and Terpineol on In-vitro Transdermal Delivery of Huperzine A from Microemulsions.[Pubmed: 24250600]

Iran J Pharm Res. 2013 Spring;12(2):271-80.

The aim of the present study was to investigate the influence and the mechanisms of cineole and Terpineol on the in-vitro transdermal delivery of huperzine A from microemulsions, and their potential synergistic effect on the permeation enhancement.
METHODS AND RESULTS:
The transdermal delivery of huperzine A from microemulsions with different concentrations of cineole and Terpineol through the rat abdominal skin was determined by Franz-type diffusion cells. The partition coefficient of huperzine A between the full thickness skin and microemulsion was determined. Attenuated total reflection-Fourier transform infrared spectroscopy (ATR-FTIR) was carried out to analyze the effects of cineole and Terpineol on the biophysical properties of the stratum corneum (SC) and the mechanisms of permeation enhancement. These results indicated that cineole and Terpineol could synergistically increase the transdermal delivery of huperzine A from microemulsions through increasing the partition and diffusion coefficients of huperzine A. ATR-FTIR studies further validated the synergistic effect and revealed that the enhancing mechanisms were due to increasing the disorderliness and fluidity of SC lipid alkyl chains, disrupting the structure of keratin in SC, and extracting SC lipids.
CONCLUSIONS:
In conclusion, cineole and Terpineol, acting synergistically to enhance the transdermal delivery of huperzine A from microemulsions, might provide an alternative permeation enhancer combination for the transdermal delivery of huperzine A.