![]() In this study, we tested the insecticidal activity of rosehip oil (Ro) and matrine combinations, and revealed the synergistic mechanism of Ro and its components with matrine from the aspects of physiology and biochemistry. Matrine is a botanical insecticide with contact and stomach toxicity, low toxicity to non-target organisms and environmentally friendly. Plant essential oils (PEOs) are rich in terpenoids and have strong penetrating ability and expansibility, which can enable rapid penetration and absorption of insecticides, thereby improving the control effect. Insecticides generally fail to achieve the desired control effect due to the difficulty in penetrating the wax shell. Icerya aegyptiaca (Douglas) is an important agricultural pest with a protective wax shell. In this chapter, we have emphasized the proven and expected medicinal value of both terpenes and terpenoids. Terpenoids display a wide range of biological activities against cancer, malaria, inflammation, tuberculosis and a variety of infectious diseases including viral as well as bacterial. Terpenoids are a group of substances that occur in nearly every natural food. Terpenoids are usually cyclic unsaturated hydrocarbons, with the altered number of oxygen moieties in the constituent groups attached to the basic isoprene skeleton. A broad range of the biological properties of terpenoids includes cancer chemo-preventive effects, antimicrobial, antifungal, antiviral, anti-hyperglycemic, anti-inflammatory, anti-parasitic activities and memory enhancers. Their concentration is generally high in plants. Terpenes are naturally occurring large and varied class of hydrocarbons substances produced by a wide variety of plants including fruits, vegetables, flowers and some animals. In this series, terpenes and terpenoids are gaining popularity among drug researchers gradually. Nowadays, plant-based chemicals have drawn the attention of pharmacy researchers due to their potent biological activity against various ailments. The results indicated that these five Artemisia species had high chemical diversity and great potential to be developed into more effective and environmentally friendly anti-insect agents. dalai-lamae, the other four species showed the same level (p > 0.05) of repellent activity as the positive control against both pests at high concentrations. tangutica oil showed the most potent contact toxicity (LD50 = 17.42 μg/adult) against Tribolium castaneum. ordosica oil exhibited the most substantial contact toxicity (LD50 = 52.11 μg/cm2) against Liposcelis bostrychophila, while A. Contact toxicity and repellency of essential oils were evaluated by bioassays A. ![]() ordosica, but the similarity was still lower than 50%. Hierarchical cluster analysis (HCA) showed the most remarkable similarity between A. tanacetifolia are characterised by monoterpene hydrocarbons and oxygenated monoterpenes. Principle component analysis (PCA) revealed that A. A total of 56 constituents were analysed, and each species consisted of 9 to 24 constituents. In this study, components of essential oils from A. Among compounds tested, trans-anethole alone showed evidence of internal synergy, whereas most of remaining synergistic or antagonistic combinations among the three most active compounds were identified as penetration-related interactions, confirmed via a divided-application bioassay.Īs a source of aromatic plants, the genus Artemisia has long been considered to have the potential to develop plant pesticides. A total of 138 synergistic or antagonistic interactions among 39 compounds were identified in binary mixtures via topical application, and these were highly correlated to changes in surface tension as measured by contact angle of the mixtures on a beeswax layer. Among the major constituents of rosemary (Rosmarinus officinalis) oil, in vitro analysis revealed up to a 19-fold increase in penetration of camphor in a binary mixture with 1,8-cineole through the larval integument, suggesting increased penetration as the major mechanism for synergy. ![]() In the present study, we report that in larvae of the cabbage looper, Trichoplusia ni, most synergistic or antagonistic insecticidal activities among mixtures of plant essential oil constituents are pharmacokinetic effects, owing to changes in solubility as well as spreadability on a wax layer. Although several hypotheses for this have been proposed, the underlying mechanism has not been fully elucidated thus far. Many plant essential oils and their terpenoid constituents possess bioactivities including insecticidal activity, and they sometimes act synergistically when mixed.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |