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Pinto C, Loiola F, Garcia T, Romano E, Altoe L, Garcia L, Oliveira D, Rodrigo A, Fernandes H. Using the ASCO’s quality oncology practice initiative (QOPI) metrics and standards to improve value, meaningful use of resources and reduce waste. Ann Oncol 2017. [DOI: 10.1093/annonc/mdx375.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Borges A, Lopez-Romero JC, Oliveira D, Giaouris E, Simões M. Prevention, removal and inactivation of Escherichia coli and Staphylococcus aureus biofilms using selected monoterpenes of essential oils. J Appl Microbiol 2017; 123:104-115. [PMID: 28497526 DOI: 10.1111/jam.13490] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2017] [Revised: 04/27/2017] [Accepted: 05/06/2017] [Indexed: 02/04/2023]
Abstract
AIMS The aim of this study was to investigate the antibiofilm potential of five essential oil (EO) components with cyclic (sabinene-SAB, carveol-C1, carvone-C2) and acyclic (citronellol-C3 and citronellal-C4) structures against Escherichia coli and Staphylococcus aureus. METHODS AND RESULTS The selected EO components prevented biofilm set-up, with C3 and C4 causing remarkable effects. When applied against pre-established biofilms, they promoted high biomass removal and inactivation of biofilm cells. Moreover, no viable E. coli biofilm cells were detected after exposure to SAB at 5 × MIC and 10 × MIC, and a significant viability decrease was observed for both bacteria with the other EO components. SAB, C3 and C4 caused the most prominent effects apparently due to their octanol-water partition coefficient (Po/w), the number of rotatable bonds (n-ROTB) and the free hydroxyl groups. CONCLUSIONS The overall results demonstrated that the selected EO components, particularly SAB, C3 and C4 are of interest as new lead molecules to both prevent biofilm set-up and to control pre-established biofilms of E. coli and S. aureus. SIGNIFICANCE AND IMPACT OF THE STUDY The tested EO components exhibited prominent antibiofilm properties against E. coli and S. aureus providing a novel and effective alternative/complementary approach to counteract chronic infections and the transmission of diseases in clinical settings.
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Cansian RL, Vanin AB, Orlando T, Piazza SP, Puton BMS, Cardoso RI, Gonçalves IL, Honaiser TC, Paroul N, Oliveira D. Toxicity of clove essential oil and its ester eugenyl acetate against Artemia salina. BRAZ J BIOL 2017; 77:155-161. [DOI: 10.1590/1519-6984.12215] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2015] [Accepted: 12/10/2015] [Indexed: 11/21/2022] Open
Abstract
Abstract The production of compounds via enzymatic esterification has great scientific and technological interest due to the several inconveniences related to acid catalysis, mainly by these systems do not fit to the concept of “green chemistry”. Besides, natural products as clove oil present compounds with excellent biological potential. Bioactives compounds are often toxic at high doses. The evaluation of lethality in a less complex animal organism can be used to a monitoring simple and rapid, helping the identification of compounds with potential insecticide activity against larvae of insect vector of diseases. In this sense, the toxicity against Artemia salina of clove essential oil and its derivative eugenyl acetate obtained by enzymatic esterification using Novozym 435 as biocatalyst was evaluated. The conversion of eugenyl acetate synthesis was 95.6%. The results about the evaluation of toxicity against the microcrustacean Artemia salina demonstrated that both oil (LC50= 0.5993 µg.mL–1) and ester (LC50= 0.1178 µg.mL–1) presented high toxic potential, being the eugenyl acetate almost 5 times more toxic than clove essential oil. The results reported here shows the potential of employing clove oil and eugenyl acetate in insecticide formulations.
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Mendes B, Dias F, Oliveira D, Sarmento S. Assessing the feasibility of simulating different tube current limits in noise oriented ATCM systems. Phys Med 2016. [DOI: 10.1016/j.ejmp.2016.07.178] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
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Maciel T, L. Júnior N, Araújo V, Silva Filho A, Gomes D, Barbosa A, Farias C, Magalhães A, Lima M, Melo S, Oliveira D. Avaliação dos perfis minerais séricos, urinários e sedimentares de ovinos recebendo dieta calculogênica. ARQ BRAS MED VET ZOO 2016. [DOI: 10.1590/1678-4162-8363] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
RESUMO A urolitíase obstrutiva em pequenos ruminantes é uma doença metabólica de etiologia multifatorial com distribuição mundial. A elevação da concentração urinária de solutos, minerais ionizados (cristaloides) que formam cristais insolúveis é citada por alguns autores como o fator mais importante. Assim, o conhecimento do perfil mineral dos animais submetidos a dietas calculogênicas e a composição química dos urólitos tornam-se ferramentas eficazes na prevenção da doença. Neste estudo, foram utilizados 14 ovinos hígidos, machos (não castrados), da raça Santa Inês, com idade aproximada de 90 dias, distribuídos em dois grupos (G1 - sem vitamina C e G2 - com vitamina C) e alimentados com dieta calculogênica. A análise dos perfis minerais, séricos e urinários revelou completo desbalanceamento na relação entre concentrações de cálcio, fósforo e magnésio, havendo elevação expressiva do fósforo e do magnésio e diminuição substancial do cálcio. Com isso, a análise bioquímica dos urólitos demonstrou que o cálcio esteve presente em 50% das amostras analisadas.
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Mendonça AN, Härter CJ, Souza SF, Oliveira D, Boaventura Neto O, Biagioli B, Resende KT, Teixeira IAMA. Net mineral requirements for growth of Saanen goat kids in early life are similar among genders. J Anim Physiol Anim Nutr (Berl) 2016; 101:113-120. [PMID: 27080168 DOI: 10.1111/jpn.12518] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2016] [Accepted: 03/12/2016] [Indexed: 11/29/2022]
Abstract
The current mineral requirements for growing goat kids are based on sheep and cattle studies without differentiating between the stages of development or gender. The aims of this study were to determine the net requirements for growth of Ca, P, Mg, Na and K of Saanen goat kids during the initial stages of growth and to analyse the effect of gender on the net requirements for growth of these macrominerals. Eighteen female, 19 intact male and 10 castrated male Saanen goat kids were studied. The kids were selected applying a completely randomized design and slaughtered when their body weight (BW) reached approximately 5, 10 and 15 kg to determine the mineral requirements for growth at these stages. The net mineral requirements for growth were similar among genders. The goat kids had slightly increased net requirements of Ca, P and Mg for growth with increasing BW from 5 to 15 kg. The net requirements for growth of Ca, P, Mg, Na and K ranged from 9.61 to 9.67 g/kg of BW gain, 7.14 to 7.56 g/kg of BW gain, 0.34 to 0.37 g/kg of BW gain, 1.26 to 1.13 g/kg of BW gain, 1.88 to 1.82 g/kg of BW gain as the animals grew from 5 to 15 kg respectively. In conclusion, when formulating diets for Saanen goat kids in early growth stage mineral levels do not need to adjusted based on gender.
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Mendes TM, Guimarães-Okamoto PTC, Machado-de-Avila RA, Oliveira D, Melo MM, Lobato ZI, Kalapothakis E, Chávez-Olórtegui C. General characterization of Tityus fasciolatus scorpion venom. Molecular identification of toxins and localization of linear B-cell epitopes. Toxicon 2015; 99:109-17. [PMID: 25817000 DOI: 10.1016/j.toxicon.2015.03.018] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2014] [Revised: 03/24/2015] [Accepted: 03/25/2015] [Indexed: 11/18/2022]
Abstract
This communication describes the general characteristics of the venom from the Brazilian scorpion Tityus fasciolatus, which is an endemic species found in the central Brazil (States of Goiás and Minas Gerais), being responsible for sting accidents in this area. The soluble venom obtained from this scorpion is toxic to mice being the LD50 is 2.984 mg/kg (subcutaneally). SDS-PAGE of the soluble venom resulted in 10 fractions ranged in size from 6 to 10-80 kDa. Sheep were employed for anti-T. fasciolatus venom serum production. Western blotting analysis showed that most of these venom proteins are immunogenic. T. fasciolatus anti-venom revealed consistent cross-reactivity with venom antigens from Tityus serrulatus. Using known primers for T. serrulatus toxins, we have identified three toxins sequences from T. fasciolatus venom. Linear epitopes of these toxins were localized and fifty-five overlapping pentadecapeptides covering complete amino acid sequence of the three toxins were synthesized in cellulose membrane (spot-synthesis technique). The epitopes were located on the 3D structures and some important residues for structure/function were identified.
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Maass D, Todescato D, Moritz DE, Oliveira JV, Oliveira D, Ulson de Souza AA, Guelli Souza SMA. Desulfurization and denitrogenation of heavy gas oil by Rhodococcus erythropolis ATCC 4277. Bioprocess Biosyst Eng 2015; 38:1447-53. [DOI: 10.1007/s00449-015-1386-7] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2015] [Accepted: 03/02/2015] [Indexed: 10/23/2022]
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Galo JM, Streit DP, Povh JA, Fornari DC, Resende EK, Oliveira D, Ribeiro RP. Sperm quality of the Amazon catfish Leiarius marmoratus (Gill, 1870) after cold storage. BRAZ J BIOL 2015; 74:933-8. [PMID: 25627605 DOI: 10.1590/1519-6984.00313] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2013] [Accepted: 06/13/2013] [Indexed: 11/22/2022] Open
Abstract
This study aimed at assessing the sperm quality of the Amazon catfish, Leiarius marmoratus ¸ after refrigeration without extenders. After capturing the animals and stripping of semen, the following parameters were analyzed: progressive motility, motility quality score, duration of motility and sperm morphology. An aliquot of fresh semen from each male was kept at room temperature (28 ± 2°C) as a control, for further comparison with cooled semen. The semen from each animal was stored in extenders-free individual syringes. The syringes were kept in ice within polystyrene boxes at 13 ± 2°C. For both fresh and cooled semen, seminal parameters were evaluated every one-hour interval, reaching seven hours of analysis. Fresh semen showed a significant decrease in motility, motility quality score and duration of motility remaining viable only for three hours. Progressive motility of the cooled semen displayed a negative linear pattern (P<0.05). The duration of motility increased (P<0.05), reaching its peak after three hours of storage. The motility quality score showed a quadratic pattern. No statistical differences were observed when sperm morphology was assessed (P>0.05), even though the mean values of total abnormalities have increased over the storage time. Further studies focusing on the application of this technique should be performed, including the addition of extenders and cryoprotectants for preservation of the sperm over longer periods.
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Lerin LA, Catani M, Oliveira D, Massi A, Bortolini O, Cavazzini A, Giovannini PP. Continuous ion-exchange resin catalysed esterification of eugenol for the optimized production of eugenyl acetate using a packed bed microreactor. RSC Adv 2015. [DOI: 10.1039/c5ra08457a] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A green scalable flow-synthesis process for the production of eugenyl acetate, an eugenol derivative with potential applications in food and medicinal chemistry, was developed.
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Rocha M, Oliveira D, Correa I, Ferracane J, Sinhoreti M, Correr A. Synergism of CQ-amine and TPO in experimental resin composites. Dent Mater 2015. [DOI: 10.1016/j.dental.2015.08.141] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Oliveira D, Rocha M, Correa I, Correr A, Ferracane J, Sinhoreti M. Curing profiles of CQ- and TPO-based composites using polywave leds. Dent Mater 2015. [DOI: 10.1016/j.dental.2015.08.139] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Carneiro C, Oliveira D, Tavares S, Rocha R, Marinho R, Gomes A, Sousa M, Brandão T, Braga I, Nunes V. 450. Surgical oncological elderly patients – QoL after ICU. Eur J Surg Oncol 2014. [DOI: 10.1016/j.ejso.2014.08.438] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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Bompadre TFV, Neto OB, Mendonca AN, Souza SF, Oliveira D, Fernandes MHMR, Harter CJ, Almeida AK, Resende KT, Teixeira IAMA. Energy requirements in early life are similar for male and female goat kids. ASIAN-AUSTRALASIAN JOURNAL OF ANIMAL SCIENCES 2014; 27:1712-20. [PMID: 25358364 PMCID: PMC4213682 DOI: 10.5713/ajas.2014.14140] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/25/2014] [Revised: 06/06/2014] [Accepted: 06/29/2014] [Indexed: 11/28/2022]
Abstract
Little is known about the gender differences in energetic requirements of goats in early life. In this study, we determined the energy requirements for maintenance and gain in intact male, castrated male and female Saanen goat kids using the comparative slaughter technique and provide new data on their body composition and energy efficiency. To determine the energy requirements for maintenance, we studied 21 intact males, 15 castrated males and 18 females (5.0±0.1 kg initial body weight (BW) and 23±5 d of age) using a split-plot design with the following main factors: three genders (intact males, castrated males, and females) and three dry matter intake levels (ad libitum, 75% and 50% of ad libitum intake). A slaughter group included three kids, one for each nutritional plane, of each gender, and all three animals within a group were slaughtered when the ad libitum kid reached 15 kg in BW. Net energy requirements for gain were obtained for 17 intact males, eight castrated males and 15 females (5.1±0.4 kg BW and 23±13 d of age). Animals were fed ad libitum and slaughtered when they reached 5, 10, and 15 kg in BW. A digestion trial was performed with nine kids of each gender to determine digestible energy, metabolizable energy and energy metabolizability of the diet. Our results show no effect of gender on the energy requirements for maintenance and gain, and overall net energy for maintenance was 205.6 kJ/kg0.75 empty body weight gain (EBW) (170.3 kJ/kg0.75 BW) from 5 to 15 kg BW. Metabolizable energy for maintenance was calculated by iteration, assuming heat production equal to metabolizable energy intake at maintenance, and the result was 294.34 kJ/kg0.75 EBW and km of 0.70. As BW increased from 5 to 15 kg for all genders, the net energy required for gain increased from 9.5 to 12.0 kJ/g EBW gain (EWG), and assuming kg = 0.47, metabolizable energy for gain ranged from 20.2 to 25.5 kJ/g EWG. Our results indicate that it is not necessary to formulate diets with different energetic content for intact male, castrated male and female Saanen goat kids weighing from 5 to 15 kg.
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Trentin CM, Scherer RP, Dalla Rosa C, Treichel H, Oliveira D, Oliveira JV. Continuous lipase-catalyzed esterification of soybean fatty acids under ultrasound irradiation. Bioprocess Biosyst Eng 2014; 37:841-7. [PMID: 24078183 DOI: 10.1007/s00449-013-1052-x] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2013] [Accepted: 09/05/2013] [Indexed: 10/26/2022]
Abstract
This work investigates the continuous production of alkyl esters from soybean fatty acid (FA) charges using immobilized Novozym 435 as catalyst. The experiments were performed in a packed-bed bioreactor evaluating the effects of FA charge to alcohol (methanol and ethanol) molar ratio, from 1:1 to 1:6, substrate flow rate in the range of 0.5-2.5 mL/min and output irradiation power up to 154 W, at fixed temperature of 65 °C, on the reaction conversion. Results showed that almost complete conversions to fatty acids ethyl esters were achieved at mild ultrasonic power (61.6 W), FA to ethanol molar ratio of 1:6, operating temperature (65 °C) and remained nearly constant for long-term reactions without negligible enzyme activity losses.
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Moraes D, Toledo O, Gamarra L, Araújo F, Sibov T, Marti L, Azevedo R, Oliveira D. Analyses of CD90 role in the growth, osteogenic differentiation and morphology, immunogenic property of human mesenchymal stem cells (MSC). Cytotherapy 2014. [DOI: 10.1016/j.jcyt.2014.01.235] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Ribeiro T, Britto H, Oliveira D, Silva E, Galvão E, Lindquist A. Effects of treadmill training with partial body weight support and the proprioceptive neuromuscular facilitation method on hemiparetic gait: a randomized controlled study. Eur J Phys Rehabil Med 2013; 49:451-461. [PMID: 23172402] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
BACKGROUND Gait disturbance is common after stroke; however, there is no consensus regarding the optimal therapeutic rehabilitation of hemiparetic gait. AIM To compare the effects of the treadmill training with partial body-weight support (TPBWS) and Proprioceptive Neuromuscular Facilitation (PNF) method on gait of subjects with chronic stroke. DESIGN Randomized clinical trial, comparing two experimental groups (comparative study). SETTING Laboratory for Human Movement Analysis of UFRN. POPULATION Twenty-three subjects, with a mean age of 56.7±8.0 years and a mean time since the onset of the stroke of 27.7±20.3 months, able to walk with personal assistance or assistive devices. METHODS Two experimental groups underwent gait training based on PNF method (N.=11) or using the TPBWS (N.=12), for twelve sessions. Evaluation of motor function (using the STREAM and motor FIM), and kinematic gait analysis were carried out before and after the interventions. RESULTS Increases in the STREAM scores (F=49.189, P<0.001) and in motor FIM scores (F=7.093, P=0.016), as well as improvement in symmetry ratio-swing time of the paretic leg/swing time of non-paretic leg--(F=7.729, P=0.012), were observed for both groups. Speed, stride length and double-support time showed no change after training. Differences between groups were observed only for the maximum ankle dorsiflexion over the swing phase (F=6.046, P=0.024), which showed an increase for the PNF group. Other angular parameters remain unchanged. CONCLUSION Improvement in motor function and in gait symmetry was observed for both groups, suggesting similarity of interventions. However, the sample size should be carefully considered in generalizing the results to other populations. CLINICAL REHABILITATION IMPACT The results showed some equivalence between these two approaches with regard to motor recovery, functionality and temporal symmetry of hemiparetic gait, suggesting that the cost-effectiveness of each treatment may have a important role in this choice.
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Correia N, Lima N, Seara L, Colombo M, Oliveira D, Casimiro G, Barbosa B. P6.071 Projects for Strengthen Civil Society’s Actions Related to the STD/HIV/AIDS and Viral Hepatitis Epidemic. Br J Vener Dis 2013. [DOI: 10.1136/sextrans-2013-051184.1224] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Mendes TM, Oliveira D, Figueiredo LFM, Machado-de-Avila RA, Duarte CG, Dias-Lopes C, Guimarães G, Felicori L, Minozzo JC, Chávez-Olortegui C. Generation and characterization of a recombinant chimeric protein (rCpLi) consisting of B-cell epitopes of a dermonecrotic protein from Loxosceles intermedia spider venom. Vaccine 2013; 31:2749-55. [PMID: 23664158 DOI: 10.1016/j.vaccine.2013.03.048] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2013] [Revised: 02/27/2013] [Accepted: 03/28/2013] [Indexed: 11/30/2022]
Abstract
A chimeric protein was constructed expressing three epitopes of LiD1, a dermonecrotic toxin from the venom of Loxosceles intermedia spider. This species is responsible for a large number of accidents involving spiders in Brazil. We demonstrated that the chimeric protein (rCpLi) generated is atoxic and that antibodies previously developed in rabbits against synthetic epitopes reactive with rCpLi in ELISA and immunoblot assays. The antibody response in rabbits against the rCpLi was evaluated by ELISA and we have detected an antibody response in all immunized animals. Overlapping peptides covering the amino acid sequence of the rCpLi were synthesized on a cellulose membrane, and their recognition by rabbit anti-rCpLi serum assessed. Three different antigenic regions were identified. The percentage of inhibition of the dermonecrotic, hemorrhagic and edematogenic activities caused by the recombinant protein LiD1r in naïve rabbits was assessed by pre-incubation with anti-rCpLi antibodies. Anti-rCpLi induced good dermonecrotic and hemorrhagic protection. The levels of protection were similar to the antiboides anti-LiD1r. In summary, we have developed a polyepitope recombinant chimeric protein capable of inducing multiple responses of neutralizing antibodies in a rabbit model. This engineered protein may be a promising candidate for therapeutic serum development or vaccination.
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Prado C, Blefari V, Oliveira D, Silva CA, Fazan R, Salgado HC, Rossi MA. 248 IS DYSTROPHIN ABSENCE IMPLICATED IN THE TRANSITION FROM PHYSIOLOGICAL TO PATHOLOGICAL CARDIAC HYPERTROPHY? BRITISH HEART JOURNAL 2013. [DOI: 10.1136/heartjnl-2013-304019.248] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Dias BA, Segato F, Souza T, Damásio A, Almeida R, Citadini A, Oliveira D, Murakami M, Gomes E, Squina F. Structural and functional analysis of a GH12 from Aspergillus terreus. Acta Crystallogr A 2012. [DOI: 10.1107/s0108767312096572] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Chiaradia V, Paroul N, Cansian RL, Júnior CV, Detofol MR, Lerin LA, Oliveira JV, Oliveira D. Synthesis of eugenol esters by lipase-catalyzed reaction in solvent-free system. Appl Biochem Biotechnol 2012; 168:742-51. [PMID: 22864649 DOI: 10.1007/s12010-012-9814-5] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2012] [Accepted: 07/24/2012] [Indexed: 10/28/2022]
Abstract
Enzymatic esterification of eugenol is a matter of great scientific and technological interest due to the well-known drawbacks of the chemical-catalyzed route as well as the potential use of produced compounds as natural antimicrobials. This work reports the maximization of eugenil acetate production by esterification of eugenol and acetic anhydride in a solvent-free system using Novozym 435 as catalyst. The antimicrobial activity of eugenol and eugenil acetate was also determined. The operating conditions that maximized eugenil acetate production were 50 °C, eugenol to acetic anhydride of 1:3, 150 rpm, and 5.5 wt% of enzyme, with a conversion of 99 %. A kinetic study was performed to assess the influence of substrates molar ratio, enzyme concentration, and temperature on eugenil acetate yield. Results show that an excess of anhydride, low enzyme concentration (1 wt%), and 60 °C afforded nearly complete conversion after 6 h of reaction. The highest antimicrobial activity of eugenil acetate was observed against Acinetobacter sp. (48.66 mm) at concentration of 20 μL. Results indicate that the esterification of eugenol improved its antimicrobial properties. New experimental data on enzymatic esterification of eugenol and acetic anhydride are reported in this work, showing a promising perspective to overcome the inconvenient of the chemical-catalyzed route for obtaining antimicrobial natural compounds.
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Zeni J, Colet R, Cence K, Tiggemann L, Toniazzo G, Cansian RL, Di Luccio M, Oliveira D, Valduga E. Screening of microorganisms for production of carotenoids Selección de microorganismos para la producción de carotenoides. CYTA - JOURNAL OF FOOD 2011. [DOI: 10.1080/19476337.2010.499570] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Schwert R, Verlindo R, Cichoski AJ, Oliveira D, Valduga E. Comparative evaluation of liquid and traditional smoke on oxidative stability, color and sensory properties of Brazilian calabrese sausage Evaluación comparativa del ahumado tradicional y líquido en la estabilidad oxidativa, propiedades de color y sensoriales de la salchicha calabresa brasileña. CYTA - JOURNAL OF FOOD 2011. [DOI: 10.1080/19476337.2010.491581] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Lerin L, Ceni G, Richett A, Kubiak G, Oliveira JV, Toniazzo G, Treichel H, Oestreicher EG, Oliveira D. Successive cycles of utilization of novozym 435 in three different reaction systems. BRAZILIAN JOURNAL OF CHEMICAL ENGINEERING 2011. [DOI: 10.1590/s0104-66322011000200002] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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