Aim Investigation of alkaloids from the leaves of Brazilian medicinal plantCroton hemiargyerius var. gymnodiscus. Methods Silica gel column chromatography was used repeatedlyfor the isolation and purification, and the...Aim Investigation of alkaloids from the leaves of Brazilian medicinal plantCroton hemiargyerius var. gymnodiscus. Methods Silica gel column chromatography was used repeatedlyfor the isolation and purification, and their structures were identified by extensive spectroscopyand comparison of the chemical and physical data with those of authentic samples reported inliterature. Results Twelve alkaloids were isolated and their structures were identified. ConclusionFour new alkaloids named hemiargines A (1), B (5), C (6) and D (7), together with eight knownalkaloids namely isoc-orydine (2), corydine (3), norcorydine (4), salutaridine (8), glaucine (9),tetrahydropalmatrubine (10), xylopinoine (11), and norlaudanosine (12) were isolated.展开更多
Six types of termites＇ baits （cartoon, rough tissues, soft toilet tissues, acacia wood, saw dust of building wood and sackcloth） were elicited variable degree of attraction toward Anacanthotermes ochaceus, where th...Six types of termites＇ baits （cartoon, rough tissues, soft toilet tissues, acacia wood, saw dust of building wood and sackcloth） were elicited variable degree of attraction toward Anacanthotermes ochaceus, where the best one was cardboard, followed by soft and rough toilet tissue at mono-choice and multiple-choice tests. Chemical analysis showed that there were variations in the chemical constituents （lignin, cellulose, N, H and C） of the six baits studied. On the other hand, olfactory reactions of harvester termites toward eight volatile oils （four natural medical plants and four commercial terpines） were repellent, but the most repellent one was cineol and the least one was clove oil. The most tested oils were caused inhibition in feeding, except cedar wood. The most toxic oils were cineol followed by thymol.展开更多
文摘Aim Investigation of alkaloids from the leaves of Brazilian medicinal plantCroton hemiargyerius var. gymnodiscus. Methods Silica gel column chromatography was used repeatedlyfor the isolation and purification, and their structures were identified by extensive spectroscopyand comparison of the chemical and physical data with those of authentic samples reported inliterature. Results Twelve alkaloids were isolated and their structures were identified. ConclusionFour new alkaloids named hemiargines A (1), B (5), C (6) and D (7), together with eight knownalkaloids namely isoc-orydine (2), corydine (3), norcorydine (4), salutaridine (8), glaucine (9),tetrahydropalmatrubine (10), xylopinoine (11), and norlaudanosine (12) were isolated.
文摘Six types of termites＇ baits （cartoon, rough tissues, soft toilet tissues, acacia wood, saw dust of building wood and sackcloth） were elicited variable degree of attraction toward Anacanthotermes ochaceus, where the best one was cardboard, followed by soft and rough toilet tissue at mono-choice and multiple-choice tests. Chemical analysis showed that there were variations in the chemical constituents （lignin, cellulose, N, H and C） of the six baits studied. On the other hand, olfactory reactions of harvester termites toward eight volatile oils （four natural medical plants and four commercial terpines） were repellent, but the most repellent one was cineol and the least one was clove oil. The most tested oils were caused inhibition in feeding, except cedar wood. The most toxic oils were cineol followed by thymol.
