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Shangtzen Chang - One of the best experts on this subject based on the ideXlab platform.
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insecticidal activities of leaf essential oils from cinnamomum osmophloeum against three mosquito species
2009Co-Authors: Sensung Cheng, Weijune Chen, Juyun Liu, Chingi Huang, Yenray Hsui, Shangtzen ChangAbstract:Abstract The larvicidal activities of leaf essential oils and their constituents from six chemotypes of indigenous cinnamon (Cinnamomum osmophloeum Kaneh.) trees were evaluated against three mosquito species. Results of larvicidal tests demonstrated that the leaf essential oils of Cinnamaldehyde type and Cinnamaldehyde/cinnamyl acetate type had an excellent inhibitory effect against Aedes albopictus larvae, and their LC50 values in 24 h were 40.8 μg/ml (LC90 = 81.7 μg/ml) and 46.5 μg/ml (LC90 = 83.3 μg/ml), respectively. Results of the 24-h mosquito larvicidal assays also showed that the effective constituents in leaf essential oils were trans-Cinnamaldehyde and benzaldehyde and that the LC50 values of these constituents against A. albopictus larvae were below 50 μg/ml. In addition, Cinnamaldehyde type leaf essential oil and trans-Cinnamaldehyde have also exhibited great larvicidal performance against Culex quinquefasciatus and Armigeres subalbatus larvae. Comparisons of mosquito larvicidal activity of trans-Cinnamaldehyde congeners revealed that α-methyl Cinnamaldehyde, benzaldehyde, and trans-Cinnamaldehyde exhibited strong mosquito larvicidal activity.
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terminating red imported fire ants using cinnamomum osmophloeum leaf essential oil
2008Co-Authors: Sensung Cheng, Juyun Liu, Yenray Hsui, Chunya Lin, Shangtzen ChangAbstract:Eleven compounds from indigenous cinnamon (Cinnamomum osmophloeum) leaf essential oil were identified by GC-MS and the dominant constituent was trans-Cinnamaldehyde (79.85%). The toxicity of leaf essential oil and trans-Cinnamaldehyde were then determined to study their effectiveness in controlling the red imported fire ant, Solenopsis invicta Buren. The results of the toxicity tests indicated that both the indigenous cinnamon leaf essential oil and trans-Cinnamaldehyde had an excellent inhibitory effect in controlling the red imported fire ant. The LT(50) values for both 2% leaf essential oil and 2% trans-Cinnamaldehyde after open exposure were 105.0min and 32.2min; after close exposure were 18.5min and 21.2min, respectively.
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Cinnamaldehyde inhibits pro inflammatory cytokines secretion from monocytes macrophages through suppression of intracellular signaling
2008Co-Authors: Louis Kuoping Chao, Sensung Cheng, Kuofeng Hua, Hsienyeh Hsu, Ifan Lin, C Y Chen, Shuitein Chen, Shangtzen ChangAbstract:We investigated the in vitro anti-inflammatory effects of Cinnamaldehyde, a cytokine production inhibitor isolated from an essential oil produced from the leaves of Cinnamomum osmophloeum Kaneh, and its mechanism of action. Although Cinnamaldehyde has been reported to have contact sensitizing properties at high concentration (mM), we found that low concentration of Cinnamaldehyde (muM) inhibited the secretion of interleukin-1beta and tumor necrosis factor alpha within lipopolysaccharide (LPS) or lipoteichoic acid (LTA) stimulated murine J774A.1 macrophages. Cinnamaldehyde also suppressed the production of these cytokines from LPS stimulated human blood monocytes derived primary macrophages and human THP-1 monocytes. Furthermore, Cinnamaldehyde also inhibited the production of prointerleukin-1beta within LPS or LTA stimulated human THP-1 monocytes. Reactive oxygen species release from LPS stimulated J774A.1 macrophages was reduced by Cinnamaldehyde. The phosphorylation of extracellular signal-regulated kinase 1/2 and c-Jun N-terminal kinase 1/2 induced by LPS was also inhibited by Cinnamaldehyde; however, Cinnamaldehyde neither antagonize the binding of LPS to the cells nor alter the cell surface expression of toll-like receptor 4 and CD14. In addition, we also noted that Cinnamaldehyde appeared to elicit no cytotoxic effect upon J774A.1 macrophages under our experimental conditions, although Cinnamaldehyde reduced J774A.1 macrophages proliferation as analysed by MTT assay. Our current results have demonstrated the anti-oxidation and anti-inflammatory properties of Cinnamaldehyde that could provide the possibility for Cinnamaldehyde's future pharmaceutical application in the realm of immuno-modulation.
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chemical polymorphism and antifungal activity of essential oils from leaves of different provenances of indigenous cinnamon cinnamomum osmophloeum
2006Co-Authors: Sensung Cheng, Juyun Liu, Yenray Hsui, Shangtzen ChangAbstract:The essential oils isolated from nine geographical provenances of indigenous cinnamon (Cinnamomum osmophloeum Kaneh.) leaves were examined by GC-MS and their chemical constituents were compared. According to GC-MS and cluster analyses the leaf essential oils of the nine provenances and their relative contents were classified into six chemotypes-Cinnamaldehyde type, Cinnamaldehyde/cinnamyl acetate type, cinnamyl acetate type, linalool type, camphor type and mixed type. In addition, the antifungal activities of leaf essential oils and their constituents from six chemotypes of indigenous cinnamon were investigated in this study. Results from the antifungal tests demonstrated that the leaf essential oils of Cinnamaldehyde type and Cinnamaldehyde/cinnamyl acetate type had an excellent inhibitory effect against white-rot fungi, Trametes versicolor and Lenzites betulina and brown-rot fungus Laetiporus sulphureus. The antifungal indices of leaf essential oils from these two chemotypes at the level of 200 micro/ml against T. versicolor, L. betulina and L. sulphureus were all 100%. Among them, the IC(50) (50% of inhibitory concentrations) value of the essential oil of Cinnamaldehyde type leaf against L. sulphureus was 52-59microg/ml. Cinnamaldehyde possessed the strongest antifungal activities in comparison with other constituents of the essential oils from Cinnamaldehyde type leaf, at the level of 100microg/ml its antifungal indices against T. versicolor, L. betulina and L. sulphureus were 100%. The IC50 values of Cinnamaldehyde against T. versicolor, L. betulina and L. sulphureus were 73, 74 and 73microg/ml, respectively.
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antifungal activities of essential oils and their constituents from indigenous cinnamon cinnamomum osmophloeum leaves against wood decay fungi
2005Co-Authors: Shengyang Wang, Pinfun Chen, Shangtzen ChangAbstract:Cinnamomum osmophloeum Kaneh is one of the hardwood species indigenous to Taiwan that possesses significant antifungal activity. To examine the antifungal activity of leaf essential oils and dominant constituents from C. osmophloeum, the essential oils of leaves from three clones (A, B, and C) collected from Haw-Lin experimental forest were extracted and their components analyzed by gas chromatography. Results from the antifungal tests demonstrated that the essential oils of both B and C leaves had strong inhibitory effects. The antifungal indices of these two leaf oils at 100 ppm against five strains of white rot fungi and four strains of brown rot fungi were all 100%. Cinnamaldehyde, the major compound in C. osmophloeum leaf essential oils, possessed the strongest antifungal activities compared with the other components. Its antifungal indices against both Coriolus versicolor and Laetiporus sulphureus were 100%. The MIC (minimum inhibitory concentration) of Cinnamaldehyde against C. versicolor and L. sulphureus was 50 and 75 ppm, respectively. In addition, comparisons of the antifungal indices of Cinnamaldehydes congeners proved that Cinnamaldehyde exhibited the strongest antifungal activities. � 2004 Elsevier Ltd. All rights reserved.
Sensung Cheng - One of the best experts on this subject based on the ideXlab platform.
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insecticidal activities of leaf essential oils from cinnamomum osmophloeum against three mosquito species
2009Co-Authors: Sensung Cheng, Weijune Chen, Juyun Liu, Chingi Huang, Yenray Hsui, Shangtzen ChangAbstract:Abstract The larvicidal activities of leaf essential oils and their constituents from six chemotypes of indigenous cinnamon (Cinnamomum osmophloeum Kaneh.) trees were evaluated against three mosquito species. Results of larvicidal tests demonstrated that the leaf essential oils of Cinnamaldehyde type and Cinnamaldehyde/cinnamyl acetate type had an excellent inhibitory effect against Aedes albopictus larvae, and their LC50 values in 24 h were 40.8 μg/ml (LC90 = 81.7 μg/ml) and 46.5 μg/ml (LC90 = 83.3 μg/ml), respectively. Results of the 24-h mosquito larvicidal assays also showed that the effective constituents in leaf essential oils were trans-Cinnamaldehyde and benzaldehyde and that the LC50 values of these constituents against A. albopictus larvae were below 50 μg/ml. In addition, Cinnamaldehyde type leaf essential oil and trans-Cinnamaldehyde have also exhibited great larvicidal performance against Culex quinquefasciatus and Armigeres subalbatus larvae. Comparisons of mosquito larvicidal activity of trans-Cinnamaldehyde congeners revealed that α-methyl Cinnamaldehyde, benzaldehyde, and trans-Cinnamaldehyde exhibited strong mosquito larvicidal activity.
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terminating red imported fire ants using cinnamomum osmophloeum leaf essential oil
2008Co-Authors: Sensung Cheng, Juyun Liu, Yenray Hsui, Chunya Lin, Shangtzen ChangAbstract:Eleven compounds from indigenous cinnamon (Cinnamomum osmophloeum) leaf essential oil were identified by GC-MS and the dominant constituent was trans-Cinnamaldehyde (79.85%). The toxicity of leaf essential oil and trans-Cinnamaldehyde were then determined to study their effectiveness in controlling the red imported fire ant, Solenopsis invicta Buren. The results of the toxicity tests indicated that both the indigenous cinnamon leaf essential oil and trans-Cinnamaldehyde had an excellent inhibitory effect in controlling the red imported fire ant. The LT(50) values for both 2% leaf essential oil and 2% trans-Cinnamaldehyde after open exposure were 105.0min and 32.2min; after close exposure were 18.5min and 21.2min, respectively.
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Cinnamaldehyde inhibits pro inflammatory cytokines secretion from monocytes macrophages through suppression of intracellular signaling
2008Co-Authors: Louis Kuoping Chao, Sensung Cheng, Kuofeng Hua, Hsienyeh Hsu, Ifan Lin, C Y Chen, Shuitein Chen, Shangtzen ChangAbstract:We investigated the in vitro anti-inflammatory effects of Cinnamaldehyde, a cytokine production inhibitor isolated from an essential oil produced from the leaves of Cinnamomum osmophloeum Kaneh, and its mechanism of action. Although Cinnamaldehyde has been reported to have contact sensitizing properties at high concentration (mM), we found that low concentration of Cinnamaldehyde (muM) inhibited the secretion of interleukin-1beta and tumor necrosis factor alpha within lipopolysaccharide (LPS) or lipoteichoic acid (LTA) stimulated murine J774A.1 macrophages. Cinnamaldehyde also suppressed the production of these cytokines from LPS stimulated human blood monocytes derived primary macrophages and human THP-1 monocytes. Furthermore, Cinnamaldehyde also inhibited the production of prointerleukin-1beta within LPS or LTA stimulated human THP-1 monocytes. Reactive oxygen species release from LPS stimulated J774A.1 macrophages was reduced by Cinnamaldehyde. The phosphorylation of extracellular signal-regulated kinase 1/2 and c-Jun N-terminal kinase 1/2 induced by LPS was also inhibited by Cinnamaldehyde; however, Cinnamaldehyde neither antagonize the binding of LPS to the cells nor alter the cell surface expression of toll-like receptor 4 and CD14. In addition, we also noted that Cinnamaldehyde appeared to elicit no cytotoxic effect upon J774A.1 macrophages under our experimental conditions, although Cinnamaldehyde reduced J774A.1 macrophages proliferation as analysed by MTT assay. Our current results have demonstrated the anti-oxidation and anti-inflammatory properties of Cinnamaldehyde that could provide the possibility for Cinnamaldehyde's future pharmaceutical application in the realm of immuno-modulation.
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chemical polymorphism and antifungal activity of essential oils from leaves of different provenances of indigenous cinnamon cinnamomum osmophloeum
2006Co-Authors: Sensung Cheng, Juyun Liu, Yenray Hsui, Shangtzen ChangAbstract:The essential oils isolated from nine geographical provenances of indigenous cinnamon (Cinnamomum osmophloeum Kaneh.) leaves were examined by GC-MS and their chemical constituents were compared. According to GC-MS and cluster analyses the leaf essential oils of the nine provenances and their relative contents were classified into six chemotypes-Cinnamaldehyde type, Cinnamaldehyde/cinnamyl acetate type, cinnamyl acetate type, linalool type, camphor type and mixed type. In addition, the antifungal activities of leaf essential oils and their constituents from six chemotypes of indigenous cinnamon were investigated in this study. Results from the antifungal tests demonstrated that the leaf essential oils of Cinnamaldehyde type and Cinnamaldehyde/cinnamyl acetate type had an excellent inhibitory effect against white-rot fungi, Trametes versicolor and Lenzites betulina and brown-rot fungus Laetiporus sulphureus. The antifungal indices of leaf essential oils from these two chemotypes at the level of 200 micro/ml against T. versicolor, L. betulina and L. sulphureus were all 100%. Among them, the IC(50) (50% of inhibitory concentrations) value of the essential oil of Cinnamaldehyde type leaf against L. sulphureus was 52-59microg/ml. Cinnamaldehyde possessed the strongest antifungal activities in comparison with other constituents of the essential oils from Cinnamaldehyde type leaf, at the level of 100microg/ml its antifungal indices against T. versicolor, L. betulina and L. sulphureus were 100%. The IC50 values of Cinnamaldehyde against T. versicolor, L. betulina and L. sulphureus were 73, 74 and 73microg/ml, respectively.
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chemical composition and mosquito larvicidal activity of essential oils from leaves of different cinnamomum osmophloeum provenances
2004Co-Authors: Sensung Cheng, Weijune Chen, Juyun Liu, Kunhsien Tsai, Shangtzen ChangAbstract:Chemical compositions of leaf essential oils from eight provenances of indigenous cinnamon (Cinnamomum osmophloeum Kaneh.) were compared. According to GC-MS and cluster analyses, the leaf essential oils of the eight provenances and their relative contents were classified into five chemotypesCinnamaldehyde type, linalool type, camphor type, Cinnamaldehyde/cinnamyl acetate type, and mixed type. The larvicidal activities of leaf essential oils and their constituents from the five chemotypes of indigenous cinnamon trees were evaluated by mosquito larvicidal assay. Results of larvicidal tests demonstrated that the leaf essential oils of Cinnamaldehyde type and Cinnamaldehyde/cinnamyl acetate type had an excellent inhibitory effect against the fourth-instar larvae of Aedes aegypti. The LC50 values for Cinnamaldehyde type and Cinnamaldehyde/cinnamyl acetate type against A. aegypti larvae in 24 h were 36 ppm (LC90 = 79 ppm) and 44 ppm (LC90 = 85 ppm), respectively. Results of the 24-h mosquito larvicidal assays a...
Pangchui Shaw - One of the best experts on this subject based on the ideXlab platform.
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authentication and quantitative analysis on the chemical profile of cassia bark cortex cinnamomi by high pressure liquid chromatography
2005Co-Authors: Chunfeng Qiao, Quanbin Han, Chuenlung Cheng, Renwang Jiang, Paul Puihay But, Pangchui ShawAbstract:Cassia bark or cortex cinnamomi, the dried stem bark of Cinnamomum cassia Presl. (Lauraceae), is a popular natural spice and a commonly used herb in traditional Chinese medicine. However, adulterants are frequently found in the market. In this study, 44 samples of Cassia bark including bark from seven related Cinnamomum species were collected from fields and market. Four characteristic components, Cinnamaldehyde, cinnamic acid, cinnamyl alcohol, and coumarin were determined by RP-HPLC, and a fingerprint comprised of five markers was established. These results showed that cassia barks contained high contents of Cinnamaldehyde (13.01-56.93 mg/g). The highest content of Cinnamaldehyde (up to 93.83 mg/g) was found in debarked cortex, which is traditionally regarded as having the best quality in local herb shops. In contrast, the adulterants from the other Cinnamomum species, C. wilsonii Camble, C. japonicum Sieb., C. mairei Levl. and C. burmanii (Nees) Blume, contained low contents of Cinnamaldehyde (<2.00 mg/g). The content of Cinnamaldehyde in C. loureirii Nees was comparable to that in C. cassia. It is suggested that five characteristic peaks by HPLC are suitable for distinguishing genuine cassia bark from the adulterants and could be applied in the quality control of this commodity.
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authentication and quantitative analysis on the chemical profile of cassia bark cortex cinnamomi by high pressure liquid chromatography
2005Co-Authors: Zhendan He, Chunfeng Qiao, Chuenlung Cheng, Renwang Jiang, Hongxi Xu, Pangchui ShawAbstract:Cassia bark or cortex cinnamomi, the dried stem bark of Cinnamomum cassia Presl. (Lauraceae), is a popular natural spice and a commonly used herb in traditional Chinese medicine. However, adulterants are frequently found in the market. In this study, 44 samples of Cassia bark including bark from seven related Cinnamomum species were collected from fields and market. Four characteristic components, Cinnamaldehyde, cinnamic acid, cinnamyl alcohol, and coumarin were determined by RP-HPLC, and a fingerprint comprised of five markers was established. These results showed that cassia barks contained high contents of Cinnamaldehyde (13.01−56.93 mg/g). The highest content of Cinnamaldehyde (up to 93.83 mg/g) was found in debarked cortex, which is traditionally regarded as having the best quality in local herb shops. In contrast, the adulterants from the other Cinnamomum species, C. wilsonii Camble, C. japonicum Sieb., C. mairei Levl. and C. burmanii (Nees) Blume, contained low contents of Cinnamaldehyde (<2.00 mg...
Juyun Liu - One of the best experts on this subject based on the ideXlab platform.
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insecticidal activities of leaf essential oils from cinnamomum osmophloeum against three mosquito species
2009Co-Authors: Sensung Cheng, Weijune Chen, Juyun Liu, Chingi Huang, Yenray Hsui, Shangtzen ChangAbstract:Abstract The larvicidal activities of leaf essential oils and their constituents from six chemotypes of indigenous cinnamon (Cinnamomum osmophloeum Kaneh.) trees were evaluated against three mosquito species. Results of larvicidal tests demonstrated that the leaf essential oils of Cinnamaldehyde type and Cinnamaldehyde/cinnamyl acetate type had an excellent inhibitory effect against Aedes albopictus larvae, and their LC50 values in 24 h were 40.8 μg/ml (LC90 = 81.7 μg/ml) and 46.5 μg/ml (LC90 = 83.3 μg/ml), respectively. Results of the 24-h mosquito larvicidal assays also showed that the effective constituents in leaf essential oils were trans-Cinnamaldehyde and benzaldehyde and that the LC50 values of these constituents against A. albopictus larvae were below 50 μg/ml. In addition, Cinnamaldehyde type leaf essential oil and trans-Cinnamaldehyde have also exhibited great larvicidal performance against Culex quinquefasciatus and Armigeres subalbatus larvae. Comparisons of mosquito larvicidal activity of trans-Cinnamaldehyde congeners revealed that α-methyl Cinnamaldehyde, benzaldehyde, and trans-Cinnamaldehyde exhibited strong mosquito larvicidal activity.
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terminating red imported fire ants using cinnamomum osmophloeum leaf essential oil
2008Co-Authors: Sensung Cheng, Juyun Liu, Yenray Hsui, Chunya Lin, Shangtzen ChangAbstract:Eleven compounds from indigenous cinnamon (Cinnamomum osmophloeum) leaf essential oil were identified by GC-MS and the dominant constituent was trans-Cinnamaldehyde (79.85%). The toxicity of leaf essential oil and trans-Cinnamaldehyde were then determined to study their effectiveness in controlling the red imported fire ant, Solenopsis invicta Buren. The results of the toxicity tests indicated that both the indigenous cinnamon leaf essential oil and trans-Cinnamaldehyde had an excellent inhibitory effect in controlling the red imported fire ant. The LT(50) values for both 2% leaf essential oil and 2% trans-Cinnamaldehyde after open exposure were 105.0min and 32.2min; after close exposure were 18.5min and 21.2min, respectively.
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chemical polymorphism and antifungal activity of essential oils from leaves of different provenances of indigenous cinnamon cinnamomum osmophloeum
2006Co-Authors: Sensung Cheng, Juyun Liu, Yenray Hsui, Shangtzen ChangAbstract:The essential oils isolated from nine geographical provenances of indigenous cinnamon (Cinnamomum osmophloeum Kaneh.) leaves were examined by GC-MS and their chemical constituents were compared. According to GC-MS and cluster analyses the leaf essential oils of the nine provenances and their relative contents were classified into six chemotypes-Cinnamaldehyde type, Cinnamaldehyde/cinnamyl acetate type, cinnamyl acetate type, linalool type, camphor type and mixed type. In addition, the antifungal activities of leaf essential oils and their constituents from six chemotypes of indigenous cinnamon were investigated in this study. Results from the antifungal tests demonstrated that the leaf essential oils of Cinnamaldehyde type and Cinnamaldehyde/cinnamyl acetate type had an excellent inhibitory effect against white-rot fungi, Trametes versicolor and Lenzites betulina and brown-rot fungus Laetiporus sulphureus. The antifungal indices of leaf essential oils from these two chemotypes at the level of 200 micro/ml against T. versicolor, L. betulina and L. sulphureus were all 100%. Among them, the IC(50) (50% of inhibitory concentrations) value of the essential oil of Cinnamaldehyde type leaf against L. sulphureus was 52-59microg/ml. Cinnamaldehyde possessed the strongest antifungal activities in comparison with other constituents of the essential oils from Cinnamaldehyde type leaf, at the level of 100microg/ml its antifungal indices against T. versicolor, L. betulina and L. sulphureus were 100%. The IC50 values of Cinnamaldehyde against T. versicolor, L. betulina and L. sulphureus were 73, 74 and 73microg/ml, respectively.
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chemical composition and mosquito larvicidal activity of essential oils from leaves of different cinnamomum osmophloeum provenances
2004Co-Authors: Sensung Cheng, Weijune Chen, Juyun Liu, Kunhsien Tsai, Shangtzen ChangAbstract:Chemical compositions of leaf essential oils from eight provenances of indigenous cinnamon (Cinnamomum osmophloeum Kaneh.) were compared. According to GC-MS and cluster analyses, the leaf essential oils of the eight provenances and their relative contents were classified into five chemotypesCinnamaldehyde type, linalool type, camphor type, Cinnamaldehyde/cinnamyl acetate type, and mixed type. The larvicidal activities of leaf essential oils and their constituents from the five chemotypes of indigenous cinnamon trees were evaluated by mosquito larvicidal assay. Results of larvicidal tests demonstrated that the leaf essential oils of Cinnamaldehyde type and Cinnamaldehyde/cinnamyl acetate type had an excellent inhibitory effect against the fourth-instar larvae of Aedes aegypti. The LC50 values for Cinnamaldehyde type and Cinnamaldehyde/cinnamyl acetate type against A. aegypti larvae in 24 h were 36 ppm (LC90 = 79 ppm) and 44 ppm (LC90 = 85 ppm), respectively. Results of the 24-h mosquito larvicidal assays a...
Yenray Hsui - One of the best experts on this subject based on the ideXlab platform.
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insecticidal activities of leaf essential oils from cinnamomum osmophloeum against three mosquito species
2009Co-Authors: Sensung Cheng, Weijune Chen, Juyun Liu, Chingi Huang, Yenray Hsui, Shangtzen ChangAbstract:Abstract The larvicidal activities of leaf essential oils and their constituents from six chemotypes of indigenous cinnamon (Cinnamomum osmophloeum Kaneh.) trees were evaluated against three mosquito species. Results of larvicidal tests demonstrated that the leaf essential oils of Cinnamaldehyde type and Cinnamaldehyde/cinnamyl acetate type had an excellent inhibitory effect against Aedes albopictus larvae, and their LC50 values in 24 h were 40.8 μg/ml (LC90 = 81.7 μg/ml) and 46.5 μg/ml (LC90 = 83.3 μg/ml), respectively. Results of the 24-h mosquito larvicidal assays also showed that the effective constituents in leaf essential oils were trans-Cinnamaldehyde and benzaldehyde and that the LC50 values of these constituents against A. albopictus larvae were below 50 μg/ml. In addition, Cinnamaldehyde type leaf essential oil and trans-Cinnamaldehyde have also exhibited great larvicidal performance against Culex quinquefasciatus and Armigeres subalbatus larvae. Comparisons of mosquito larvicidal activity of trans-Cinnamaldehyde congeners revealed that α-methyl Cinnamaldehyde, benzaldehyde, and trans-Cinnamaldehyde exhibited strong mosquito larvicidal activity.
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terminating red imported fire ants using cinnamomum osmophloeum leaf essential oil
2008Co-Authors: Sensung Cheng, Juyun Liu, Yenray Hsui, Chunya Lin, Shangtzen ChangAbstract:Eleven compounds from indigenous cinnamon (Cinnamomum osmophloeum) leaf essential oil were identified by GC-MS and the dominant constituent was trans-Cinnamaldehyde (79.85%). The toxicity of leaf essential oil and trans-Cinnamaldehyde were then determined to study their effectiveness in controlling the red imported fire ant, Solenopsis invicta Buren. The results of the toxicity tests indicated that both the indigenous cinnamon leaf essential oil and trans-Cinnamaldehyde had an excellent inhibitory effect in controlling the red imported fire ant. The LT(50) values for both 2% leaf essential oil and 2% trans-Cinnamaldehyde after open exposure were 105.0min and 32.2min; after close exposure were 18.5min and 21.2min, respectively.
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chemical polymorphism and antifungal activity of essential oils from leaves of different provenances of indigenous cinnamon cinnamomum osmophloeum
2006Co-Authors: Sensung Cheng, Juyun Liu, Yenray Hsui, Shangtzen ChangAbstract:The essential oils isolated from nine geographical provenances of indigenous cinnamon (Cinnamomum osmophloeum Kaneh.) leaves were examined by GC-MS and their chemical constituents were compared. According to GC-MS and cluster analyses the leaf essential oils of the nine provenances and their relative contents were classified into six chemotypes-Cinnamaldehyde type, Cinnamaldehyde/cinnamyl acetate type, cinnamyl acetate type, linalool type, camphor type and mixed type. In addition, the antifungal activities of leaf essential oils and their constituents from six chemotypes of indigenous cinnamon were investigated in this study. Results from the antifungal tests demonstrated that the leaf essential oils of Cinnamaldehyde type and Cinnamaldehyde/cinnamyl acetate type had an excellent inhibitory effect against white-rot fungi, Trametes versicolor and Lenzites betulina and brown-rot fungus Laetiporus sulphureus. The antifungal indices of leaf essential oils from these two chemotypes at the level of 200 micro/ml against T. versicolor, L. betulina and L. sulphureus were all 100%. Among them, the IC(50) (50% of inhibitory concentrations) value of the essential oil of Cinnamaldehyde type leaf against L. sulphureus was 52-59microg/ml. Cinnamaldehyde possessed the strongest antifungal activities in comparison with other constituents of the essential oils from Cinnamaldehyde type leaf, at the level of 100microg/ml its antifungal indices against T. versicolor, L. betulina and L. sulphureus were 100%. The IC50 values of Cinnamaldehyde against T. versicolor, L. betulina and L. sulphureus were 73, 74 and 73microg/ml, respectively.