The Experts below are selected from a list of 69 Experts worldwide ranked by ideXlab platform
Peter J. Duggan - One of the best experts on this subject based on the ideXlab platform.
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Molecular Markers for Pyrethrin Autoxidation in Stored Pyrethrum Crop: Analysis and Structure Determination
Journal of agricultural and food chemistry, 2016Co-Authors: Jamie A. Freemont, Stuart W. Littler, Oliver E. Hutt, Stephanie Mauger, Adam G. Meyer, Maurice G. Kerr, John H. Ryan, Helen F. Cole, David A. Winkler, Peter J. DugganAbstract:Pyrethrum is a natural insecticide extracted from Tanacetum cinerarIIfolium. Six esters, the Pyrethrins, are responsible for the extract’s insecticidal activity. The oxidative degradation of Pyrethrins through contact with aerial oxygen is a potential cause of Pyrethrin losses during pyrethrum manufacture. Described here is the first investigation of the autoxidation chemistry of the six Pyrethrin esters isolated from pyrethrum. It was found that Pyrethrins I and II, the major Pyrethrin esters present in pyrethrum, undergo autoxidation more readily than the minor Pyrethrin esters, the jasmolins and cinerins. Chromatographic analysis of Pyrethrin I and II autoxidation mixtures showed some correlation with a similar analysis performed on extracts from T. cinerarIIfolium crop, which had been stored for 12 weeks without added antioxidants. Two Pyrethrin II autoxidation products were isolated, characterized, and shown to be present in extracts of stored T. cinerarIIfolium crop, confirming that autoxidation of ...
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Molecular Markers for Pyrethrin Autoxidation in Stored Pyrethrum Crop: Analysis and Structure Determination
2016Co-Authors: Jamie A. Freemont, Stuart W. Littler, Oliver E. Hutt, Stephanie Mauger, Adam G. Meyer, David A. Winkler, Maurice G. Kerr, John H. Ryan, Helen F. Cole, Peter J. DugganAbstract:Pyrethrum is a natural insecticide extracted from Tanacetum cinerarIIfolium. Six esters, the Pyrethrins, are responsible for the extract’s insecticidal activity. The oxidative degradation of Pyrethrins through contact with aerial oxygen is a potential cause of Pyrethrin losses during pyrethrum manufacture. Described here is the first investigation of the autoxidation chemistry of the six Pyrethrin esters isolated from pyrethrum. It was found that Pyrethrins I and II, the major Pyrethrin esters present in pyrethrum, undergo autoxidation more readily than the minor Pyrethrin esters, the jasmolins and cinerins. Chromatographic analysis of Pyrethrin I and II autoxidation mixtures showed some correlation with a similar analysis performed on extracts from T. cinerarIIfolium crop, which had been stored for 12 weeks without added antioxidants. Two Pyrethrin II autoxidation products were isolated, characterized, and shown to be present in extracts of stored T. cinerarIIfolium crop, confirming that autoxidation of Pyrethrin esters does occur during crop storage
Martina Grdiša - One of the best experts on this subject based on the ideXlab platform.
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matrix solid phase dispersion optimization for determination of Pyrethrin content in dalmatian pyrethrum tanacetum cinerarIIfolium trevir sch bip by liquid chromatography
Industrial Crops and Products, 2020Co-Authors: Martina Biosic, Filip Varga, Zlatko Satovic, Dario Dabic, Ines Topalovic, Martina GrdišaAbstract:Abstract The mixture of six components (Pyrethrin I and II, cinerin I and II, and jasmolin I and II) constituting natural insecticide Pyrethrin is responsible for the insecticidal activity of Dalmatian pyrethrum (Tanacetum cinerarIIfolium /Trevir./ Sch. Bip.). In order to obtain deeper knowledge of its insecticidal potential, the extraction of mentioned components from plant samples was carried out for the first time, by matrix solid-phase dispersion. The influence of different factors such as the type of sorbent, sorbent-sample ratio, the elution solvent and its volume, addition of co-sorbent and drying agent, affecting extraction yield was evaluated. The Pyrethrin components were extracted under optimized conditions: florisil (0.5 g) as the sorbent, mixed with 0.25 g of pyrethrum flower heads, 5 mL of acetone-ethyl acetate (1:1, v/v) as the elution solvent and 0.4 g of Na2SO4 as the drying agent. All six components in the extracts were qualitatively and quantitatively determined by HPLC-DAD. Analytical method provides high degree of linearity with r2≻0.9974, except for Pyrethrin II (0.9961). Also, the method showed good precision (intra- and inter-day) with a relative standard deviation below 14 %, and recoveries mainly above 80 %. In order to demonstrate the applicability of the developed method, three Dalmatian pyrethrum natural populations from Croatia were analyzed.
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morphological and biochemical diversity of dalmatian pyrethrum tanacetum cinerarIIfolium trevir sch bip
Agriculturae Conspectus Scientificus (Poljoprivredna Znanstvena Smotra), 2009Co-Authors: Martina Grdiša, Klaudija Carovicstanko, Ivan Kolak, Zlatko SatovicAbstract:Summary Dalmatian pyrethrum (Tanacetum cinerarIIfolium /Trevir./ Sch. Bip.) is a perennial herbaceous plant belonging to the Asteraceae family. It is endemic to the East coast of the Adriatic Sea and its natural habitat extends from Italy to northern Albania and up in the mountainous regions of Croatia, Bosnia and Herzegovina and Montenegro. Pyrethrum fl owers yield an important insecticide, the Pyrethrin. Pyrethrin is mainly concentrated in oil glands on the surface of the seed inside the tightly packed fl ower head, but they can also be found in the other plant parts, however in much lower concentrations. Th e Pyrethrin exist as a combination of six insecticide active ingredients: Pyrethrin I, cinerin I, jasmolin I, Pyrethrin II, cinerin II and jasmolin II, with Pyrethrin I and Pyrethrin II present in higher concentrations. Pyrethrin is non-toxic to mammals and other worm-blooded animals, it is unstable in light, oxygen, water and at elevated temperatures and therefore highly biodegradable. Due to the fact it is environmentally safe it is leading insecticide in organic farming systems. Th e most scientifi c work concerning Dalmatian pyrethrum was focused on its morphological and biochemical traits that are relevant in breeding. Breeding programmes are primarily focused on increasing the yield of Pyrethrin per unit area. Relative to dry fl ower weight, fl ower heads contain the majority of the Pyrethrin. Croatian wild populations contain approximately 0.60 to 0.79 %, while clones in breeding programmes of Australia and Kenya contain up to 3.0 % of Pyrethrin.
Jamie A. Freemont - One of the best experts on this subject based on the ideXlab platform.
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Molecular Markers for Pyrethrin Autoxidation in Stored Pyrethrum Crop: Analysis and Structure Determination
Journal of agricultural and food chemistry, 2016Co-Authors: Jamie A. Freemont, Stuart W. Littler, Oliver E. Hutt, Stephanie Mauger, Adam G. Meyer, Maurice G. Kerr, John H. Ryan, Helen F. Cole, David A. Winkler, Peter J. DugganAbstract:Pyrethrum is a natural insecticide extracted from Tanacetum cinerarIIfolium. Six esters, the Pyrethrins, are responsible for the extract’s insecticidal activity. The oxidative degradation of Pyrethrins through contact with aerial oxygen is a potential cause of Pyrethrin losses during pyrethrum manufacture. Described here is the first investigation of the autoxidation chemistry of the six Pyrethrin esters isolated from pyrethrum. It was found that Pyrethrins I and II, the major Pyrethrin esters present in pyrethrum, undergo autoxidation more readily than the minor Pyrethrin esters, the jasmolins and cinerins. Chromatographic analysis of Pyrethrin I and II autoxidation mixtures showed some correlation with a similar analysis performed on extracts from T. cinerarIIfolium crop, which had been stored for 12 weeks without added antioxidants. Two Pyrethrin II autoxidation products were isolated, characterized, and shown to be present in extracts of stored T. cinerarIIfolium crop, confirming that autoxidation of ...
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Molecular Markers for Pyrethrin Autoxidation in Stored Pyrethrum Crop: Analysis and Structure Determination
2016Co-Authors: Jamie A. Freemont, Stuart W. Littler, Oliver E. Hutt, Stephanie Mauger, Adam G. Meyer, David A. Winkler, Maurice G. Kerr, John H. Ryan, Helen F. Cole, Peter J. DugganAbstract:Pyrethrum is a natural insecticide extracted from Tanacetum cinerarIIfolium. Six esters, the Pyrethrins, are responsible for the extract’s insecticidal activity. The oxidative degradation of Pyrethrins through contact with aerial oxygen is a potential cause of Pyrethrin losses during pyrethrum manufacture. Described here is the first investigation of the autoxidation chemistry of the six Pyrethrin esters isolated from pyrethrum. It was found that Pyrethrins I and II, the major Pyrethrin esters present in pyrethrum, undergo autoxidation more readily than the minor Pyrethrin esters, the jasmolins and cinerins. Chromatographic analysis of Pyrethrin I and II autoxidation mixtures showed some correlation with a similar analysis performed on extracts from T. cinerarIIfolium crop, which had been stored for 12 weeks without added antioxidants. Two Pyrethrin II autoxidation products were isolated, characterized, and shown to be present in extracts of stored T. cinerarIIfolium crop, confirming that autoxidation of Pyrethrin esters does occur during crop storage
Zlatko Satovic - One of the best experts on this subject based on the ideXlab platform.
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matrix solid phase dispersion optimization for determination of Pyrethrin content in dalmatian pyrethrum tanacetum cinerarIIfolium trevir sch bip by liquid chromatography
Industrial Crops and Products, 2020Co-Authors: Martina Biosic, Filip Varga, Zlatko Satovic, Dario Dabic, Ines Topalovic, Martina GrdišaAbstract:Abstract The mixture of six components (Pyrethrin I and II, cinerin I and II, and jasmolin I and II) constituting natural insecticide Pyrethrin is responsible for the insecticidal activity of Dalmatian pyrethrum (Tanacetum cinerarIIfolium /Trevir./ Sch. Bip.). In order to obtain deeper knowledge of its insecticidal potential, the extraction of mentioned components from plant samples was carried out for the first time, by matrix solid-phase dispersion. The influence of different factors such as the type of sorbent, sorbent-sample ratio, the elution solvent and its volume, addition of co-sorbent and drying agent, affecting extraction yield was evaluated. The Pyrethrin components were extracted under optimized conditions: florisil (0.5 g) as the sorbent, mixed with 0.25 g of pyrethrum flower heads, 5 mL of acetone-ethyl acetate (1:1, v/v) as the elution solvent and 0.4 g of Na2SO4 as the drying agent. All six components in the extracts were qualitatively and quantitatively determined by HPLC-DAD. Analytical method provides high degree of linearity with r2≻0.9974, except for Pyrethrin II (0.9961). Also, the method showed good precision (intra- and inter-day) with a relative standard deviation below 14 %, and recoveries mainly above 80 %. In order to demonstrate the applicability of the developed method, three Dalmatian pyrethrum natural populations from Croatia were analyzed.
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morphological and biochemical diversity of dalmatian pyrethrum tanacetum cinerarIIfolium trevir sch bip
Agriculturae Conspectus Scientificus (Poljoprivredna Znanstvena Smotra), 2009Co-Authors: Martina Grdiša, Klaudija Carovicstanko, Ivan Kolak, Zlatko SatovicAbstract:Summary Dalmatian pyrethrum (Tanacetum cinerarIIfolium /Trevir./ Sch. Bip.) is a perennial herbaceous plant belonging to the Asteraceae family. It is endemic to the East coast of the Adriatic Sea and its natural habitat extends from Italy to northern Albania and up in the mountainous regions of Croatia, Bosnia and Herzegovina and Montenegro. Pyrethrum fl owers yield an important insecticide, the Pyrethrin. Pyrethrin is mainly concentrated in oil glands on the surface of the seed inside the tightly packed fl ower head, but they can also be found in the other plant parts, however in much lower concentrations. Th e Pyrethrin exist as a combination of six insecticide active ingredients: Pyrethrin I, cinerin I, jasmolin I, Pyrethrin II, cinerin II and jasmolin II, with Pyrethrin I and Pyrethrin II present in higher concentrations. Pyrethrin is non-toxic to mammals and other worm-blooded animals, it is unstable in light, oxygen, water and at elevated temperatures and therefore highly biodegradable. Due to the fact it is environmentally safe it is leading insecticide in organic farming systems. Th e most scientifi c work concerning Dalmatian pyrethrum was focused on its morphological and biochemical traits that are relevant in breeding. Breeding programmes are primarily focused on increasing the yield of Pyrethrin per unit area. Relative to dry fl ower weight, fl ower heads contain the majority of the Pyrethrin. Croatian wild populations contain approximately 0.60 to 0.79 %, while clones in breeding programmes of Australia and Kenya contain up to 3.0 % of Pyrethrin.
Helen F. Cole - One of the best experts on this subject based on the ideXlab platform.
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Molecular Markers for Pyrethrin Autoxidation in Stored Pyrethrum Crop: Analysis and Structure Determination
Journal of agricultural and food chemistry, 2016Co-Authors: Jamie A. Freemont, Stuart W. Littler, Oliver E. Hutt, Stephanie Mauger, Adam G. Meyer, Maurice G. Kerr, John H. Ryan, Helen F. Cole, David A. Winkler, Peter J. DugganAbstract:Pyrethrum is a natural insecticide extracted from Tanacetum cinerarIIfolium. Six esters, the Pyrethrins, are responsible for the extract’s insecticidal activity. The oxidative degradation of Pyrethrins through contact with aerial oxygen is a potential cause of Pyrethrin losses during pyrethrum manufacture. Described here is the first investigation of the autoxidation chemistry of the six Pyrethrin esters isolated from pyrethrum. It was found that Pyrethrins I and II, the major Pyrethrin esters present in pyrethrum, undergo autoxidation more readily than the minor Pyrethrin esters, the jasmolins and cinerins. Chromatographic analysis of Pyrethrin I and II autoxidation mixtures showed some correlation with a similar analysis performed on extracts from T. cinerarIIfolium crop, which had been stored for 12 weeks without added antioxidants. Two Pyrethrin II autoxidation products were isolated, characterized, and shown to be present in extracts of stored T. cinerarIIfolium crop, confirming that autoxidation of ...
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Molecular Markers for Pyrethrin Autoxidation in Stored Pyrethrum Crop: Analysis and Structure Determination
2016Co-Authors: Jamie A. Freemont, Stuart W. Littler, Oliver E. Hutt, Stephanie Mauger, Adam G. Meyer, David A. Winkler, Maurice G. Kerr, John H. Ryan, Helen F. Cole, Peter J. DugganAbstract:Pyrethrum is a natural insecticide extracted from Tanacetum cinerarIIfolium. Six esters, the Pyrethrins, are responsible for the extract’s insecticidal activity. The oxidative degradation of Pyrethrins through contact with aerial oxygen is a potential cause of Pyrethrin losses during pyrethrum manufacture. Described here is the first investigation of the autoxidation chemistry of the six Pyrethrin esters isolated from pyrethrum. It was found that Pyrethrins I and II, the major Pyrethrin esters present in pyrethrum, undergo autoxidation more readily than the minor Pyrethrin esters, the jasmolins and cinerins. Chromatographic analysis of Pyrethrin I and II autoxidation mixtures showed some correlation with a similar analysis performed on extracts from T. cinerarIIfolium crop, which had been stored for 12 weeks without added antioxidants. Two Pyrethrin II autoxidation products were isolated, characterized, and shown to be present in extracts of stored T. cinerarIIfolium crop, confirming that autoxidation of Pyrethrin esters does occur during crop storage
