M. Negahban; S. Moharramipour; M. Zandi; S.A. Hashemi
Abstract
Recent research has focused on insecticidal property of essential oil plants in biological control of insects. Controlled release by nanoencapsulated essential oil seems to be the best choice for increasing the efficiency and minimization of environmental damage. In this work, efficiency of nanoencapsulated ...
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Recent research has focused on insecticidal property of essential oil plants in biological control of insects. Controlled release by nanoencapsulated essential oil seems to be the best choice for increasing the efficiency and minimization of environmental damage. In this work, efficiency of nanoencapsulated essential oil of Artemisia sieberi Besser was tested on repellent activity of Plutella xylostella L.. Several concentrations were prepared and then third instars larvae were introduced into each treatment. Then, repellent activity was determined after 1, 3, 6, 12 and 24 h from commencement of exposure. Results showed that at 1.9 ppm the nanocapule of Artemisia oil was shown here to possess more repellent activity (80%) to P. xylustella compered to Artemisia oil (62%) before formulation after 24h. The repellent activity varied with application method and concentrations and exposure time. The results showed higher repellent rates in nanocapsule than in essential oil due to controlled-release formulations allowing smaller quantities of essential oil to be used more effectively over a given time interval. The reasons for nanocapsulating the essential oil have been to improve its stability to reduce side effects or to reduce dosing frequency and total dosing amount, to obtain better repellent activity, and for sustained (long-lasting) release. Therefore the nanocapsulation of A. sibeiri might provide a new method for the management of P. xylostella.
M. Negahban; S. Moharramipour; M. Zandi; S.A. Hashemi
Abstract
Controlled release by nanoencapsulated formulations allow the essential oil to be used more effectively over a given time interval, suitability to mode of application and minimization of environmental damage. In this work, efficiency of nanoencapsulated essential oil of Artemisia sieberi Besser was tested ...
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Controlled release by nanoencapsulated formulations allow the essential oil to be used more effectively over a given time interval, suitability to mode of application and minimization of environmental damage. In this work, efficiency of nanoencapsulated essential oil of Artemisia sieberi Besser was tested on nutritional indices of Plutella xylostella L. Several experiments were designed to measure the indices such as Relative Growth Rate (RGR), Relative Consumption Rate (RCR), Efficiency of Conversion of Ingested food (ECI), Efficiency of Conversion of Digested food (ECD), Approximate Digestibility (AD) and Feeding Deterrent Index (FDI). Treatments were evaluated by the method of leaf disk bioassay at 25 °C, 65±5% RH, and a photoperiod of 16:8 h (Light: Dark). Ten third-instar larvae were introduced into each treatment containing different concentrations of the essential oil. Then, ingested food and weight gained were measured after 24, 48 and 72 h intervals. Results showed that nanocapsule of A. sieberi oil was highly effective compared to control (A. sieberi oil), and significantly decreased the RGR ECI, ECD and AD. Moreover, findings indicated a post-ingestive toxicity of the essential oil using the nanoencapsulated formulation. As a result, this nanoencapsulated essential oil tested merits further study as potential insecticide for the control of P. xylostella.
F. Sefidkon; B. Torabi Sagvand; M. Naderi; S.A Ghooshegir
Abstract
Nasturtium officinalis (L.) R. Br. is a prennial and aquatic plant which grows in water flows of most regions of Iran. There are flavonoids in the leaves and flowers of N. officinalis with anticancer properties. In this research, to investigate anticancer effects, leaves and flowers of N. officinalis ...
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Nasturtium officinalis (L.) R. Br. is a prennial and aquatic plant which grows in water flows of most regions of Iran. There are flavonoids in the leaves and flowers of N. officinalis with anticancer properties. In this research, to investigate anticancer effects, leaves and flowers of N. officinalis were used by maceration in methanol for preparation of extract and its fractions. Also, the extract was converted to nanocapsules. The fractions of dichloromethane, diethylether and methanol were prepared from the first extract. Nanocapsules were prepared by double emulsion method using poly-lactic-glycolic acid. Nanocapsules were dried and their dimensions and distribution coefficient were determined. To evaluate the inhibitory effects on the proliferation of breast cancer cells (T47D) and colon cancer cells (HT-29), effects of the first extract, fractions and nanocapsules were compared with Doxorubicin (500 nM) and RPMI as control treatment. Measuring the the average size of nanocapsules showed that the dimentions of 50% of nanocapsules were less than 10 nm and the other were between 50-900 nm. Results of anticancer properties of the extract and fractions of N. officinalis on both breast and colon cancer cells, for 1 to 3 days, showed that dichloromethane fraction had a stronger effect on inhibition of proliferation of cancer cells compared to the first extract and other fractions. In addition, nanocapsules in the same concentration and period of time killed more cells in comparison to the first extract. Meanwhile, the anticancer effect of N. officinalis extract on breast cancer cells was stronger than that on colon cancer cells. Consequently, the possibility of making medicines from this plant extract especially in nanocapsule form could be considered.
