Ovicidal effects of a neem seed extract preparation on eggs of body and head lice.
Summary of "Ovicidal effects of a neem seed extract preparation on eggs of body and head lice."
The eggs (nits) of head and body lice (Pediculus humanus capitis, Pediculus humanus corporis) were incubated for 5, 10, 15, 20, 30 or 45 min into a neem seed extract contained in a fine shampoo formulation (e.g. Wash Away® Louse), which is known for its significant killing effects of larvae and adults of head lice. The aim of the study was to test whether the developmental stages inside the eggs are also killed after the incubation into the shampoo. It was found that an incubation time of only 5 min was sufficient to prohibit any hatching of larvae, whilst 93 ± 4% of the larvae in the untreated controls of body lice hatched respectively about 76% of the controls in the case of head lice. Apparently, the neem-based shampoo blocked the aeropyles of the eggs, thus preventing the embryos of both races of lice from accessing oxygen and from releasing carbon dioxide. Thus, this product offers a complete cure from head lice upon a single treatment, if the lice (motile stages, eggs) are fully covered for about 10 min.
Affiliation
Department Zoology and Parasitology, Heinrich Heine University, 40225, Düsseldorf, Germany, mehlhorn@uni-duesseldorf.de.
Journal Details
This article was published in the following journal.
Name: Parasitology research
ISSN: 1432-1955
Pages:
Links
- PubMed Source: http://www.ncbi.nlm.nih.gov/pubmed/21484346
- DOI: http://dx.doi.org/10.1007/s00436-011-2374-8
Medical and Biotech [MESH] Definitions
Oviposition
The process of laying or shedding fully developed eggs (OVA) from the female body. The term is usually used for certain INSECTS or FISHES with an organ called ovipositor where eggs are stored or deposited before expulsion from the body.
Thyroid Extract, Desiccated
A dehydrated extract of thyroid glands. After the removal of fat and connective tissue, the extract is dried or lyophilized to yield a yellowish to buff-colored amorphous powder containing 0.17-0.23% of iodine.
Helleborus
A plant genus of the family RANUNCULACEAE. Members contain hellebrin (BUFANOLIDES). The extract is the basis of Biocil preparation used for rheumatism.
Grape Seed Extract
Exudate from seeds of the grape plant Vitis vinifera, composed of oils and secondary plant metabolites (BIOFLAVONOIDS and polyphenols) credited with important medicinal properties.
Perfume
A substance, extract, or preparation for diffusing or imparting an agreeable or attractive smell, especially a fluid containing fragrant natural oils extracted from flowers, woods, etc., or similar synthetic oils. (Random House Unabridged Dictionary, 2d ed)
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