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Preparation of magnetoliposomes with a green, low-cost, fast and scalable metho...
Silva, Rosangela Maria Ferreira da Costa e; Lara, Luciano Roni Silva; López Aguilar, Jorge Luis; Andrade, Ângela Leão; Oliveira, Junnia A. C.A novel, fast, low-cost and scalable methodology to prepare stable magnetoliposomes (MGLs), without the use of organic solvents, is described. The concept of the work is based on the dual use of soy lecithin associated to a new liposome preparation methodology. Soy lecithin was used to coat the nanoparticles of magnetite (Fe3 O4 @lecithin) and for encapsulation of Fe3 O4 @lecithin (Lip-Fe3 O4 @lecithin). Liposo...
Maytenus salicifolia Reissek (Celastraceae) : evaluation of the activity of ext...
Magalhães, Cássia Gonçalves; Silva, Grácia Divina de Fátima; Duarte, Lucienir Pains; Takahashi, Jacqueline Aparecida; Santos, Vagner RodriguesMaytenus salicifolia Reissek é conhecida como "cafezinho" em Minas Gerais, Brasil. Suas folhas são utilizadas na medicina popular no tratamento de úlceras estomacais. Neste trabalho é reportado o isolamento de 4´-Ometilepigalocatequina (1) e proantocianidina A (2) dos extratos polares da raiz (1; 4,36%; 2, 2,17%) e tronco (1, 4,16%; 2, 0,26%) de M. salicifolia. Pela primeira vez, esses compostos foram encontrad...
Anti-inflammatory, antimicrobial and acetylcholinesterase inhibitory activities...
Sousa, Grasiely Faria de; Aguilar, Mariana Guerra de; Dias, Danielle Ferreira; Takahashi, Jacqueline Aparecida; Moreira, Maria Eliza de CastroThe new pentacyclic triterpenoids friedel-1-en-3,16-dione (1), 1α,29-dihydroxyfriedelan-3-one (2) and 16β,28,29-trihydroxyfriedelan-3-one (3) were isolated from Maytenus robusta branches in addition to the known, but new for this species, triterpenoid 12α,29-dihydroxyfriedelan-3-one (4). The structures and stereochemistry of the novel triterpenoids were established by IR, 1D/2D NMR and HR-APCIMS spectral data. ...
Psychotria viridis : chemical constituents from leaves and biological properties.
Soares, Débora Barbosa da Silva; Duarte, Lucienir Pains; Cavalcanti, André D.; Silva, Fernando César; Braga, Ariadne Duarte; Lopes, Miriam Teresa PazThe phytochemical study of hexane, chloroform and methanol extracts from leaves of Psychotria viridis resulted in the identification of: the pentacyclic triterpenes, ursolic and oleanolic acid; the steroids, 24-methylene-cycloartanol, stigmasterol and β-sitosterol; the glycosylated steroids 3-O-β-D-glucosyl-β- sitosterol and 3-O-β-D-glucosyl-stigmasterol; a polyunsaturated triterpene, squalene; the esters of gl...
Flavonol triglycosides of leaves from Maytenus robusta with acetylcholinesteras...
Sousa, Grasiely Faria de; Aguiar, Mariana Guerra de; Takahashi, Jacqueline Aparecida; Alves, Tânia Maria de Almeida; Kohlhoff, MarkusAlthough Maytenus robusta aqueous infusions of leaves are used in Brazilian traditional medicine for stomach disease treatment, only a few chemical studies of this species are found in literature. The phytochemical investigation of methanol extract from M. robusta leaves yielded the known compound kaempferol (3) and two new flavonol glycosides: kaempferol-3-O-b-D-glucopyranosyl-(1 !3)-a-Lrhamnopyranosyl-( 1 ! 2...
Salacia crassifolia (Celastraceae) : chemical constituents and antimicrobial ac...
Rodrigues, Vanessa Gregório; Duarte, Lucienir Pains; Silva, Roqueline Rodrigues; Silva, Grácia Divina de Fátima; Simões, Maria O. MercadanteThe phytochemical study of hexane extract from leaves of Salacia crassifolia resulted in the isolation of 3β-palmitoxy-urs-12-ene, 3-oxofriedelane, 3β-hydroxyfriedelane, 3-oxo-28-hydroxyfriedelane, 3-oxo-29-hydroxyfriedelane, 28,29-dihydroxyfriedelan-3-one, 3,4-seco-friedelan-3-oic acid, 3β-hydroxy-olean-9(11):12-diene and the mixture of α-amirin and β-amirin. β-sitosterol, the polymer gutta-percha, squalene an...
Evaluation of antimicrobial activity and toxic potential of extracts and triter...
Rodrigues, Vanessa Gregório; Duarte, Lucienir Pains; Silva, Grácia Divina de Fátima; Silva, Fernando César; Góes, Jefferson Vieira deThe phytochemical study of hexane/ethyl ether (1:1) extract of the roots of M. imbricata, Celastraceae, resulted in the isolation and characterization of six known triterpenes: 11α-hydroxylup-20(29)-en-3-one, previously isolated from this species besides, 3β,11α- di-hydroxylup-20(29)-ene, 3,7-dioxofriedelane, 3-oxo-29-hydroxyfriedelane, tingenone and 6-oxo-tingenol. The chemical structures of these triterpenes ...
New triterpenes from Maytenus robusta : structural elucidation based on NMR exp...
Sousa, Grasiely Faria de; Duarte, Lucienir Pains; Alcântara, Antônio Flávio de Carvalho; Silva, Grácia Divina de Fátima; Vieira Filho, Sidney AugustoLeaves of Maytenus robusta (Celastraceae) were subjected to phytochemical investigation mainly directed at the isolation of pentacyclic triterpenes. The compounds friedelin (1), β-friedelinol (2), 3-oxo-21β-H-hop-22(29)-ene (7), 3,4-seco-friedelan-3,11β- olide (8), 3β-hydroxy-21β-H-hop-22(29)-ene (9), 3,4-seco-21β-H-hop-22(29)-en-3-oic acid (10), 3,4-seco-friedelan-3-oic acid (11), and sitosterol were identifie...
Biodegradation studies on fatty amines used for reverse flotation of iron ore.
Araujo, Danielle Marques de; Yoshida, Maria Irene; Takahashi, Jacqueline Aparecida; Carvalho, Cornélio de Freitas; Stapelfeldt, FrankBacteria present in effluents from the process of iron ore flotation were isolated and identified in an attempt to identify the microorganisms responsible for fatty amine degradation.Water samples collected at the tailings dam led to the identification of the bacterial species Serratia marcescens as the microorganism responsible for degradation, while in laboratory flotation conditions, a strain of Enterobacter...