• Anelich, L.E. and Korsten, L. (1996) Survey of micro-organisms associated with spoilage of cosmetic creams manufactured in South Africa. International Journal of Cosmetic Sciences 18, 2540.
  • Bloomfield, S.F. (1990) Microbial contamination: spoilage and hazard. In Guide to Microbiological Control in Pharmaceuticals ed. Danyer, S. and Baird, R. pp. 2952. Chichester: Ellis Horwood.
  • Brannan, D.K., Dille, J.C. and Kaufman, D.J. (1987) Correlation of in vitro challenge testing with consumer use testing for cosmetic products. Applied and Environmental Microbiology 53, 18271832.
  • European Pharmacopoeia Commission (1996) Efficacy of Antimicrobial Preservation, Group of Experts No. 1CM (Microbial Contamination). Strasbourg: Council of Europe.
  • Flores, M., Morillo, M. and Crespo, M.L. (1997) Deterioration of raw materials and cosmetic products by preservative resistant microorganisms. International Biodeterioration and Biodegradation 40, 157160.
  • Fuchs, N., Jäger, W., Lenhardt, A., Böhm, L., Buchbauer, I. and Buchbauer, G. (1997) Systemic absorption of topically applied carvone: influence of massage technique. Journal of the Society of Cosmetic Chemists 48, 277282.
  • Gao, S. and Singh, J. (1997) Mechanism of transdermal transport of 5-fluorouracil by terpenes: carvone, 1,8-cineole, and thymol. International Journal of Parmaceutics 154, 6777.
  • Grieve, M. (1981) Calamint. In A Modern Herbal ed. Leyer, C.F. pp. 152153. New York and London: Hafner Publishing.
  • Griffin, S.G., Wyllie, S.G., Markham, J.L. and Leach, D. (1999) The role of structure and molecular properties of terpenoids in determining their antimicrobial activity. Flavour and Fragrance Journal 14, 322332.
  • Hammer, K.A., Carson, C.F. and Riley, T.V. (1999) Influence of organic matter, cations and surfactants on the antimicrobial activity of Melaleuca alternifolia (tea tree) oil in vitro. Journal of Applied Microbiology 86, 446452.
  • Johnson, C., Lods, L., Scholz, D., Dres, C., Dashnaw, R.A., Linstra, L. and Brooks, G. (2000) Maintaining the integrity of cosmetic formulations via the utilization of endogenous signal molecules from plants. Agro Food Industry Hi-Tech January/February, 2325.
  • Juven, B.J., Kanner, J., Schved, F. and Weisslowicz, H. (1994) Factors that interact with the antibacterial action of thyme essential oil and its active constituents. Journal of Applied Bacteriology 76, 626631.
  • Kabara, J.J. (1984) Aroma preservatives, essential oils and fragrance as antimicrobial agents. In Cosmetic and Drug Preservation. Principles and Practice ed. Kabara, J.J. pp. 237273. New York, Basel: Marcel Dekker, Inc.
  • Leonard, T.W., Mikula, K.K. and Schlesinger, M.S. (1989) Carvone Enhancement of Transdermal Drug Delivery. US Patent 4888360.
  • Malcom, S. (1976) The survival of bacteria in toiletries. In Inhibition and Inactivation of Vegetative Microbes, Vol. 5 ed. Skinner, F. and Hugo, W. pp. 305314. London: Academic Press.
  • Manou, I., Bouillard, L., Devleeschouwer, M.J. and Barel, A.O. (1998) Evaluation of preservative properties of Thymus vulgaris essential oil in topically applied formulations under a challenge test. Journal of Applied Microbiology 84, 368376.
  • Nostro, A., Cannatelli, M.A., Morelli, I., Cioni, P.L., Bader, A., Marino, A. and Alonzo, V. (2002) Preservative properties of Calamintha officinalis essential oil with and without EDTA. Letters in Applied Microbiology 35, 385389.
  • Orafidiya, L.O., Oyedele, A.O., Shittu, A.O. and Elujoba, A.A. (2001) The formulation of an effective topical antibacterial product containing Ocimum gratissimum leaf essential oil. International Journal of Pharmaceutics 224, 177183.
  • Remmal, A., Bouchikhi, T., Tantaoui-Elaraki, A. and Ettayebi, M. (1993) Inhibition of antibacterial activity of essential oils by Tween 80 and ethanol in liquid medium. Journal de Pharmacie de Belgique 48, 352356.
  • Seo, S.B., Ryu, C.S., Ahn, G.W., Kim, H.B., Jo, B.K., Kim, S.H., Lee, J.D. and Kajiuchi, T. (2002) Development of natural preservative system using the mixture of chitosan-Inula helenium L. extract. International Journal of Cosmetic Science 24, 195206.
  • Wong, S., Street, D., Delgado, S.I. and Klontz, K.C. (2000) Recalls of foods and cosmetics due to microbial contamination reported to the U.S. Food and Drug Administration. Journal of Food Protection 63, 11131116.
  • Zani, F., Minutello, A., Maggi, L., Santi, P. and Mazza, P. (1997) Evaluation of preservative effectiveness in pharmaceutical products: the use of a wild strain of Pseudomonas cepacia. Journal of Applied Microbiology 83, 322326.