Department of Zoology and Parasitology, Cairo University, Giza, Egypt.
Parasitol Res. 2010 Feb;106(3):729-31. doi: 10.1007/s00436-009-1698-0.
The head louse problem increases at all levels of the international societies due to activities or life conditions that lead to often hair contacts among people. Lice occur exclusively on humans. Thus, they avoid dropping down from a head and therefore accept even a bad smelling hair of new a host. Due to this behaviour, there are only a few products on the markets which dare to claim a repellency activity that protects humans from infestation with head lice. The present study shows that a combination of an extract of the seeds of the plant Vitex agnus castus (monk pepper) and the compound paramenthan-3,8-diol (which is also found in some plants, e.g. Eucalyptus) act synergistically and are able to protect human hair for at least 7 h from invasion of head lice (Pediculus humanus capitis). The recently developed product containing both compounds is named Licatack Preventive Spray.
由于导致人们经常头发接触的活动或生活条件，头虱问题在国际社会各阶层都有所增加。虱子只存在于人类身上。因此，它们不会从头上掉落，因此甚至可以接受新宿主的气味难闻的头发。由于这种行为，市场上只有少数产品敢于声称具有驱避活性，可以保护人类免受头虱感染。本研究表明，植物牡荆（monk pepper）种子提取物和化合物对孟烷-3,8-二醇（也存在于某些植物中，例如桉树）的组合具有协同作用，能够保护人类头发至少 7 小时免受头虱（人虱）的侵害。最近开发的含有这两种化合物的产品名为 Licatack 预防喷雾。
