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Marco Dodier - One of the best experts on this subject based on the ideXlab platform.
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ryanoids and related compounds isolation and characterization of 11 new minor ryanoids from the plant Ryania speciosa vahl
Canadian Journal of Chemistry, 2002Co-Authors: Luc Ruest, Marco Dodier, Helene De Seve, Christian B Lessard, Pascal MongrainAbstract:In a search for minor ryanoids from the plant Ryania Speciosa Vahl, we recently characterized 11 new members of that family of natural compounds. Most of them represent ryanodine (1) and dehydroryanodine (2) with a modified stage of oxidation in ring C. A second member of the new 4-deoxy series has been identified.Key words: minor natural ryanoids, ryanodine, dehydroryanodine, deoxyryanoids.
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ryanoids and related compounds isolation and characterization of four minor ryanoids from the plant Ryania speciosa vahl 8 9 didehydroryanodine 10 o acetylryanodol 3 o benzoylryanodol and a first natural 4 deoxyryanoid 4 deoxy 8ax hydroxy 10 o methyl
Canadian Journal of Chemistry, 1999Co-Authors: Luc Ruest, Carl Berthelette, Marco Dodier, Laurence Dube, David StmartinAbstract:In a search for minor ryanoids from the plant Ryania Speciosa Vahl, we characterized four new members of that family of natural compounds: 8,9-didehydroryanodine (5), 10-O-acetylryanodol (6), 3-O-b...
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ryanoids and related compounds identification of five new ryanoids from the plant Ryania speciosa vahl formal total syntheses of 3 deoxyryanodol cinnzeylanol 10 o acetyl 3 deoxyryanodol cinnzeylanine 2 deoxyryanodol 2 deoxy 2 epiryanodol 2 3 dideoxy
Canadian Journal of Chemistry, 1996Co-Authors: Luc Ruest, Marco DodierAbstract:In the course of a preliminary investigation on the relationships between the chemical structure of ryanoids and their affinity to the ryanodine binding site, we have isolated, from the plant Ryania speciosa Vahl, four new members of this family of natural insecticidal compounds (ryanoids 3,4,5, and 6) and corrected the reported structure of a fifth one (ryanoid 7). In addition, we have synthesized, from anhydroryanodol (10), new members of this family having fewer hydroxyl groups in ring A: cinnzeylanol (14) and cinnzeylanine (15), 2,3-dideoxy-2,3-dihydroryanodol (16), 2-deoxy-3-epiryanodol (18), and 2-deoxy-3-epiryanodine (19), 2-deoxyryanodol (20), and 2-deoxy-2-epiryanodol (21). Key words: ryanoids synthesis, cinnzeylanine, 2-deoxyryanodols, 2-deoxy-3-epiryanodine.
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ryanoids and related compounds identification of five new ryanoids from the plant Ryania speciosa vahl formal total syntheses of 3 deoxyryanodol cinnzeylanol
1996Co-Authors: Luc Ruest, Marco DodierAbstract:In the course of a preliminary investigation on the relationships between the chemical structure of ryanoids and their affinity to the ryanodine binding site, we have isolated, from the plant Ryarzia speciosn Vahl, four new members of this family of natural insecticidal compounds (ryanoids 3,4,5, and 6) and corrected the reported structure of a fifth one (ryanoid 7). In addition, we have synthesized, from anhydroryanodol (lo), new members of this family having fewer hydroxyl groups in ring A: cinnzeylanol (14) and cinnzeylanine (15). 2,3-dideoxy-2,3-dihydroryanodol (16), 2-deoxy-3-epiryanodol (IS), and 2-deoxy-3- epiryanodine (19), 2-deoxyryanodol (20), and 2-deoxy-2-epiryanodol(21). Resume : Dans le cadre d'une ttude prCliminaire des relations structures chimiques - activitC biologique des ryanoi'des et de leur affinitC au site rCcepteur de la ryanodine, nous avons isole de la plante Ryania speciosa Vahl, quatre nouveaux membres de cette famille d'insecticides naturels (les ryanoi'des 3,4,5 et 6) et conigC la structure dCjB rapportCe d'un cinquikme (le ryanoi'de 7). Par ailleurs, B partir de l'anhydroryanodol (lo), nous avons synthCtisC quelques membres de cette famille, moins oxygtnCs au cycle A : le cinnzeylanol(14) et la cinnzeylanine (IS), le 2,3-didCoxy-2,3-dihydroryanodol(16), le 2-dCoxy-3-Cpiryanodol(1S) et la 2- dCoxy-3-Cpiryanodine (19), le 2-dCoxyryanodol(20) et le 2-dCoxy-2-Cpiryanodol (21). Mots clks : synthkse de ryanoi'des, cinnzeylanine, 2-dCoxyryanodols, 2-dCoxy-3-Cpiryanodine.
Luc Ruest - One of the best experts on this subject based on the ideXlab platform.
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ryanoids and related compounds isolation and characterization of 11 new minor ryanoids from the plant Ryania speciosa vahl
Canadian Journal of Chemistry, 2002Co-Authors: Luc Ruest, Marco Dodier, Helene De Seve, Christian B Lessard, Pascal MongrainAbstract:In a search for minor ryanoids from the plant Ryania Speciosa Vahl, we recently characterized 11 new members of that family of natural compounds. Most of them represent ryanodine (1) and dehydroryanodine (2) with a modified stage of oxidation in ring C. A second member of the new 4-deoxy series has been identified.Key words: minor natural ryanoids, ryanodine, dehydroryanodine, deoxyryanoids.
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ryanoids and related compounds isolation and characterization of four minor ryanoids from the plant Ryania speciosa vahl 8 9 didehydroryanodine 10 o acetylryanodol 3 o benzoylryanodol and a first natural 4 deoxyryanoid 4 deoxy 8ax hydroxy 10 o methyl
Canadian Journal of Chemistry, 1999Co-Authors: Luc Ruest, Carl Berthelette, Marco Dodier, Laurence Dube, David StmartinAbstract:In a search for minor ryanoids from the plant Ryania Speciosa Vahl, we characterized four new members of that family of natural compounds: 8,9-didehydroryanodine (5), 10-O-acetylryanodol (6), 3-O-b...
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ryanoids and related compounds identification of five new ryanoids from the plant Ryania speciosa vahl formal total syntheses of 3 deoxyryanodol cinnzeylanol 10 o acetyl 3 deoxyryanodol cinnzeylanine 2 deoxyryanodol 2 deoxy 2 epiryanodol 2 3 dideoxy
Canadian Journal of Chemistry, 1996Co-Authors: Luc Ruest, Marco DodierAbstract:In the course of a preliminary investigation on the relationships between the chemical structure of ryanoids and their affinity to the ryanodine binding site, we have isolated, from the plant Ryania speciosa Vahl, four new members of this family of natural insecticidal compounds (ryanoids 3,4,5, and 6) and corrected the reported structure of a fifth one (ryanoid 7). In addition, we have synthesized, from anhydroryanodol (10), new members of this family having fewer hydroxyl groups in ring A: cinnzeylanol (14) and cinnzeylanine (15), 2,3-dideoxy-2,3-dihydroryanodol (16), 2-deoxy-3-epiryanodol (18), and 2-deoxy-3-epiryanodine (19), 2-deoxyryanodol (20), and 2-deoxy-2-epiryanodol (21). Key words: ryanoids synthesis, cinnzeylanine, 2-deoxyryanodols, 2-deoxy-3-epiryanodine.
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ryanoids and related compounds identification of five new ryanoids from the plant Ryania speciosa vahl formal total syntheses of 3 deoxyryanodol cinnzeylanol
1996Co-Authors: Luc Ruest, Marco DodierAbstract:In the course of a preliminary investigation on the relationships between the chemical structure of ryanoids and their affinity to the ryanodine binding site, we have isolated, from the plant Ryarzia speciosn Vahl, four new members of this family of natural insecticidal compounds (ryanoids 3,4,5, and 6) and corrected the reported structure of a fifth one (ryanoid 7). In addition, we have synthesized, from anhydroryanodol (lo), new members of this family having fewer hydroxyl groups in ring A: cinnzeylanol (14) and cinnzeylanine (15). 2,3-dideoxy-2,3-dihydroryanodol (16), 2-deoxy-3-epiryanodol (IS), and 2-deoxy-3- epiryanodine (19), 2-deoxyryanodol (20), and 2-deoxy-2-epiryanodol(21). Resume : Dans le cadre d'une ttude prCliminaire des relations structures chimiques - activitC biologique des ryanoi'des et de leur affinitC au site rCcepteur de la ryanodine, nous avons isole de la plante Ryania speciosa Vahl, quatre nouveaux membres de cette famille d'insecticides naturels (les ryanoi'des 3,4,5 et 6) et conigC la structure dCjB rapportCe d'un cinquikme (le ryanoi'de 7). Par ailleurs, B partir de l'anhydroryanodol (lo), nous avons synthCtisC quelques membres de cette famille, moins oxygtnCs au cycle A : le cinnzeylanol(14) et la cinnzeylanine (IS), le 2,3-didCoxy-2,3-dihydroryanodol(16), le 2-dCoxy-3-Cpiryanodol(1S) et la 2- dCoxy-3-Cpiryanodine (19), le 2-dCoxyryanodol(20) et le 2-dCoxy-2-Cpiryanodol (21). Mots clks : synthkse de ryanoi'des, cinnzeylanine, 2-dCoxyryanodols, 2-dCoxy-3-Cpiryanodine.
Marco Cabras - One of the best experts on this subject based on the ideXlab platform.
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analysis by hplc of ryanodine and dehydroryanodine residues on fruits and in Ryania powdery wood
Journal of Agricultural and Food Chemistry, 2001Co-Authors: Paolo Cabras, Pierluigi Caboni, Marco CabrasAbstract:A simple and rapid HPLC method to evaluate residues of the major ryanoids (ryanodine and dehydroryanodine) on three fruits (olives, apples, and pears) has been developed. The pesticides were extracted from the fruits with hexane and acetone solution (1:1, v/v). Cleanup was carried out with aminopropyl-bonded silica cartridges. This method is characterized by recovery >75%, precision <11% RSD, and sensitivity of 0.020 mg/kg. The method can also be used to determine the level of active ingredients in Ryania powdery wood.
Murray B Isman - One of the best experts on this subject based on the ideXlab platform.
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horizontal transfer of diatomaceous earth and botanical insecticides in the common bed bug cimex lectularius l hemiptera cimicidae
PLOS ONE, 2013Co-Authors: Yasmin Akhtar, Murray B IsmanAbstract:Background Horizontal transfer of insecticide occurs when insects contact or ingest an insecticide, return to an aggregation or a nest, and transfer the insecticide to other conspecific insects through contact. This phenomenon has been reported in a number of insects including social insects, however it has not been reported in bed bugs. Since horizontal transfer can facilitate the spread of insecticide into hard to reach spaces, it could contribute greatly to the management of these public health pests. Methodology/Results To demonstrate horizontal transfer of diatomaceous earth and botanical insecticides in C. lectularius, an exposed (donor) bed bug, following a 10-minute acquisition period, was placed with unexposed (recipient) bed bugs. Mortality data clearly demonstrates that diatomaceous earth (DE 51) was actively transferred from a single exposed bug to unexposed bugs in a concentration dependent manner. LC50 values varied from 24.4 mg at 48 h to 5.1 mg at 216 h when a single exposed bed bug was placed with 5 unexposed bed bugs. LT50 values also exhibited a concentration response. LT50 values varied from 1.8 days to 8.4 days when a ‘donor’ bug exposed to 20 and 5 mg of dust respectively was placed with 5 ‘recipient’ bugs. Dust was also actively transferred from adult bed bugs to the nymphs. In addition we observed horizontal transfer of botanical insecticides including neem, Ryania, and rotenone to varying degrees. Conclusion/Significance Our data clearly demonstrate horizontal transfer of diatomaceous earth and botanical insecticides in the common bed bug, C. lectularius. Use of a fluorescent dust provided visual confirmation that contaminated bed bugs transfer dust to untreated bed bugs in harborage. This result is important because bedbugs live in hard-to-reach places and interaction between conspecifics can be exploited for delivery and dissemination of management products directed at this public health pest.
Paolo Cabras - One of the best experts on this subject based on the ideXlab platform.
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analysis by hplc of ryanodine and dehydroryanodine residues on fruits and in Ryania powdery wood
Journal of Agricultural and Food Chemistry, 2001Co-Authors: Paolo Cabras, Pierluigi Caboni, Marco CabrasAbstract:A simple and rapid HPLC method to evaluate residues of the major ryanoids (ryanodine and dehydroryanodine) on three fruits (olives, apples, and pears) has been developed. The pesticides were extracted from the fruits with hexane and acetone solution (1:1, v/v). Cleanup was carried out with aminopropyl-bonded silica cartridges. This method is characterized by recovery >75%, precision <11% RSD, and sensitivity of 0.020 mg/kg. The method can also be used to determine the level of active ingredients in Ryania powdery wood.
