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Dissertations / Theses on the topic 'Antimicrobial preservatives'

Author: Grafiati

Published: 5 June 2025

Last updated: 1 August 2025

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1

Giffard, Catriona Julie. "The structure-function relations of the antimicrobial peptide nisin." Thesis, University of York, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.319449.

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2

Šmétková, Zuzana. "Studium konzervačních systémů pro kosmetiku." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2009. http://www.nusl.cz/ntk/nusl-216531.

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The aim of this diploma thesis was to prove the antimicrobial actvivity of the selected syntetic preservatives used in cosmetics, such as methylparaben, butylparaben, phenoxyethanol, bronopol, imidazolidinyl urea and methylisothaizolinone, in different concentrations (up to the highest permitted concentration and in increased concentrations), and of some essential oils, which are possible to use in cosmetics (essential oil from Eucalyptus globulus, Pimpinella anisum, Lavandula officinalis, Rosmarinus officinalis, Foeniculum vulgare, Mentha piperita, Juniperus communis and Pinus sylvestris). Th

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3

Snyman, Marina J. "Isolation and antimicrobial susceptibility characterisation of listeria SPP. in selected food premises in Central South Africa." Thesis, Bloemfontein : Central University of Technology, Free State, 2011. http://hdl.handle.net/11462/138.

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Thesis (M. Tech. Environmental health) -- Central University of technology, Free State, 2011<br>Microbial pathogens play an important role in the food industry where they could cause disease and subsequently significant economic losses. Limited information is available on the situation with regard to Listeria in food products in South Africa. However, much research is being done in the rest of the world on Listeria indicating serious problems as a result of resistance development against various antimicrobial agents, including the organic acids. It is hypothesised that the situation with rega

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4

Grandjon, Vincent. "Optimisation de la formulation galénique en vue de limiter la quantité de conservateur dans les produits topiques." Thesis, Rennes 1, 2016. http://www.theses.fr/2016REN1B004.

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Aujourd’hui, l’impact des conservateurs sur l’homme est remis en question. Il a été entrepris de mieux comprendre les agents antimicrobiens d’un point de vue physico-chimique pour fournir des règles de formulation, qui pourront être utilisées pour proposer à nos laboratoires de formulation des alternatives aux antimicrobiens classiquement utilisés. Ce travail a consisté en la compréhension des caractéristiques structurelles de molécules ayant, entre autre, des propriétés antimicrobiennes ; l’analyse des mécanismes physico-chimiques qui relient ces caractéristiques structurelles à leurs proprié

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5

Rhoades, Jonathan. "The antimicrobial activity of chitosan and its application as a food preservative." Thesis, London South Bank University, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.288171.

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6

Altunakar, Bilge. "Food preservation by pulsed electric fields and selected antimicrobials." Online access for everyone, 2007. http://www.dissertations.wsu.edu/Dissertations/Fall2007/b_altunakar_120507.pdf.

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7

Pasquet, Julia. "Les nouveaux conservateurs minéraux : application à la conservation antimicrobienne de différentes formulations et étude du mécanisme antimicrobien : étude appliquée à l’oxyde de zinc." Thesis, Lyon 1, 2014. http://www.theses.fr/2014LYO10145.

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La qualité microbiologique d’un produit cosmétique se doit d’être conservée durant la totalité de sa durée de vie grâce à l’ajout notamment de conservateurs antimicrobiens. Néanmoins, les conservateurs organiques traditionnellement utilisés sont particulièrement décriés depuis quelques années car suspectés d’effets secondaires. Dans l’objectif de disposer d’alternatives à ces substances, les propriétés antimicrobiennes de l’oxyde de zinc (ZnO) ont été étudiées. L’efficacité antimicrobienne de ces particules inorganiques a ainsi été évaluée sur les cinq micro-organismes d’intérêt pour l’industr

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8

Hay, Yann-Olivier Marie. "La complexité des simples - Caractérisations chimique et biologique de combinaisons hydrolats-huiles essentielles et huiles essentielles-huiles essentielles pour l’objectivation d’effets conservateurs de produits phytothérapeutiques." Phd thesis, Toulouse, INPT, 2015. http://oatao.univ-toulouse.fr/15575/1/YHay.pdf.

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L’industrie parapharmaceutique de même que l’industrie cosmétique recherche des alternatives naturelles aux conservateurs synthétiques. Cet intérêt est lié à l’exigence du consommateur et à la volonté de développer des produits innovants éco-conçus. Compte tenu de leurs activités antioxydantes et antimicrobiennes, les huiles essentielles constituent des options intéressantes dont les coûts et impacts organoleptiques doivent cependant être considérés. Dans le cadre de cette thèse, les activités antioxydante et antimicrobienne de combinaisons huile essentielle-hydrolat et huile essentielle-huile

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9

Samperio, Cristian. "Formation, Characterization and Stability of Natural Antimicrobial-Cyclodextrin Complexes." Thesis, Virginia Tech, 2009. http://hdl.handle.net/10919/44251.

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As a response of the need for a natural antimicrobial to replace sodium benzoateâ s use as a preservative in beverages, twenty eight compounds known to have antimicrobial activity were evaluated to quantify their solubility. Twenty three of the compounds evaluated are components of plant essential oils and the remaining five compounds are alkyl esters of para-hydroxybenzoic acid. The test compounds were evaluated for aqueous solubility as well as their solubility in an acid-based beverage mixture. The compounds were found to be practically insoluble (< 100 mg/L), very slightly soluble (100 mg

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10

Andraud-Dieu, Amandine. "Recherche de molécules antimicrobiennes d'origine lichénique : Etude phytochimique de trois lichens & approche synthétique de deux composés actifs." Thesis, Limoges, 2015. http://www.theses.fr/2015LIMO0029/document.

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L’étude physicochimique de trois lichens récoltés en Limousin, Usnea florida, Flavoparmelia caperata et Cladonia incrassata, a permis d’isoler et de caractériser 16 composés issus du métabolisme secondaire. Dans un premier temps, ces lichens ont été sélectionnés lors d’un criblage analytique préliminaire réalisé sur 17 espèces. L’activité antimicrobienne des extraits acétoniques a été évaluée, puis leur fractionnement bioguidé a été mis en œuvre. Les deux isomères de l’acide usnique, 3 dibenzofuranes, 4 depsides, 3 depsidones, un acide aliphatique, un phtalide et un stérol ont été isolés. Une

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11

Franssen, Lauren Rene. "Antimicrobial properties and diffusion modeling of preservative-containing whey protein films and coatings on cheddar cheese /." For electronic version search Digital dissertations database. Restricted to UC campuses. Access is free to UC campus dissertations, 2002. http://uclibs.org/PID/11984.

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12

Pereira, Silvio Luiz Gonçalves [UNESP]. "Alteração de conservantes no pós-registro e possíveis impactos na qualidade dos medicamentos fabricados no Brasil." Universidade Estadual Paulista (UNESP), 2011. http://hdl.handle.net/11449/96247.

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Made available in DSpace on 2014-06-11T19:28:04Z (GMT). No. of bitstreams: 0 Previous issue date: 2011-02-21Bitstream added on 2014-06-13T18:32:33Z : No. of bitstreams: 1 pereira_slg_me_arafcf.pdf: 629055 bytes, checksum: 4c92bb2be28496297c6aee8cad01e39a (MD5)<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)<br>Universidade Estadual Paulista (UNESP)<br>Na sua quase totalidade, as formas farmacêuticas líquidas apresentam agentes conservantes em suas fórmulas visando a proteção contra o desenvolvimento microbiano. Entretanto, pesquisas indicam que conservantes são substân

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13

Bile, Jessica. "Microencapsulation d’agent antimicrobien pour le développement de conditionnements primaires fonctionnalisés." Thesis, Lyon 1, 2015. http://www.theses.fr/2015LYO10182/document.

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Dans un premier temps, ce travail a concerné la réalisation de microparticules chargées en agent antimicrobien suivant la technique de microencapsulation par évaporation de solvant en émulsion simple. Différentes morphologies ont été obtenues avec des microparticules éloignées du standard lisse, démontrant des cicatrices et des défauts, de la rugosité ou encore des trous. Les paramètres ainsi que les mécanismes physico-chimiques responsables des dégradations morphologiques ont été identifiés et discutés. Il a été démontré que les paramètres de formulation tels que la masse et masse molaire du

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14

Romano, Dina Lynn. "Characterization of alpha-cyclodextrin inclusion complexes with trans-cinnamic acid in an acid-based beverage system." Thesis, Virginia Tech, 2008. http://hdl.handle.net/10919/42111.

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In response to a need for a natural antimicrobial to replace sodium benzoate, cinnamic acid was chosen. Due to cinnamic acidâ s solubility issues, Î±-cyclodextrin was used as a host molecule to form an inclusion complex with the cinnamic acid molecule. The cinnamic acid: Î±-cyclodextrin inclusion complex was then characterized using phase solubility analysis, proton nuclear magnetic resonance (H-NMR), and solid inclusion. Phase solubility analysis verified the maximum amount of cinnamic acid that Î±-cyclodextrin was able to host. H-NMR was used to determine the complex association constan

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15

Chacra, Nádia Araci Bou. "Suspensão oftálmica de dexametasona e polimixina B: formulação e avaliação da eficácia antimicrobiana de conservantes." Universidade de São Paulo, 1994. http://www.teses.usp.br/teses/disponiveis/9/9139/tde-10072008-164932/.

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Suspensões oftálmicas de dexametasona e polimixina B foram formuladas variando-se os conservantes e combinando 2 concentrações de polissorbato 20 e hidroxipropilmetilcelulose segundo o projeto fatorial 2n. A estabilidade das preparações foi avaliada através de parâmetros físicos, com ênfase na facilidade de rehomogeneização após período de repouso. Das 16 fórmulas foram selecionadas 8 para avaliação da eficácia antimicrobiana do sistema conservante pelo método de desafio, segundo B.P. 88, frente a Pseudomonas aeruginosa, Pseudomonas cepacia e Sthaphylococcus aureus. O ensaio foi precedido de v

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16

Freitas, Beatriz Resende. "Avaliação da atividade antimicrobiana de extratos de folhas de Lippia salviaefolia Cham. visando sua aplicação como conservante em preparações cosméticas." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/9/9139/tde-23122016-094320/.

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O potencial farmacológico de espécies do gênero Lippia no tratamento de infecções é conhecido popularmente, assim foi considerado o estudo da atividade da Lippia salviaefolia nativa do cerrado brasileiro. O objetivo do trabalho foi avaliar a atividade antimicrobiana de extratos de Lippia salviaefolia Cham. e sua citotoxicidade, visando aplicação como conservante natural em formulações cosméticas. O ensaio antimicrobiano foi realizado através do método de difusão em placa e determinação do CMI por de microdiluição em microplacas, utilizando os microrganismos: P. aeruginosa ATCC 9027, S. aureus

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17

Arauz, Luciana Juncioni de. "Produção de nisina em leite desnatado diluído por Lactococcus lactis subsp. lactis ATCC 11454 em biorreator." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/9/9134/tde-05082011-171618/.

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Nisina é um peptídeo antimicrobiano natural produzido por Lactococcus lactis subsp. lactis ATCC 11454 durante a fase exponencial de crescimento. A bacteriocina é usada como conservante natural de alimentos, uma vez que mostra atividade antimicrobiana contra bactérias Gram-positivas e esporos. Tem potencial aplicação em inúmeros campos (farmacêutico, veterinário e cosméticos). O objetivo deste trabalho foi estudar a cinética de crescimento bacteriano e a produção de nisina em biorreator, utilizando leite desnatado diluído, como um meio de cultura a baixo custo. Também foram avaliados os consumo

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18

Merck, Florence. "La biodiversité végétale au service des ingrédients naturels : étude des propriétés antimicrobiennes et antioxydantes d’extraits végétaux et développement d’un conservateur naturel pour l’industrie cosmétique." Thesis, Université Côte d'Azur (ComUE), 2017. http://www.theses.fr/2017AZUR4118/document.

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Cette thèse de doctorat a été réalisée dans le cadre du projet NATUBAVAL visant à découvrir de nouveaux conservateurs naturels pour l’industrie cosmétique, à partir de plantes issues d’un des hotspots mondiaux de biodiversité : le bassin méditerranéen. Dix-sept extraits ont ainsi été obtenus et évalués quant à leurs propriétés antimicrobiennes contre Staphylococcus aureus, Pseudomonas aeruginosa, Aspergillus brasiliensis et Candida albicans, ainsi que leur capacité antioxydante. Santolina chamaecyparissus a démontré des propriétés remarquables, et a été sélectionnée pour une étude plus approfo

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19

Whitney, Brooke Meredith. "Efficacy of high pressure processing in combination with chemical preservatives for the reduction of Escherichia coli O157:H7 and Salmonella in apple juice and orange juice." Thesis, Virginia Tech, 2005. http://hdl.handle.net/10919/33853.

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The effect of pressure on the log reduction of six strains of E. coli O157:H7 and five serovars of Salmonella enterica were investigated in tryptic soy broth, sterile distilled water and commercially sterile orange and apple juice. Samples were subjected to high hydrostatic pressure (HHP) at 300 and 550 MPa for 2 minutes at 6Â°C, and then held for 24 hours at 4Â°C following treatment. E. coli O157:H7 strain E009 was the most pressure resistant, having a decrease of only 0.77 log10 CFU/ml directly after pressurization in TSB. S. Agona was the most pressure resistant Salmonella serovar tested

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20

Pereira, Silvio Luiz Gonçalves. "Alteração de conservantes no pós-registro e possíveis impactos na qualidade dos medicamentos fabricados no Brasil /." Araraquara : [s.n.], 2011. http://hdl.handle.net/11449/96247.

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Resumo: Na sua quase totalidade, as formas farmacêuticas líquidas apresentam agentes conservantes em suas fórmulas visando a proteção contra o desenvolvimento microbiano. Entretanto, pesquisas indicam que conservantes são substâncias tóxicas, pois dependendo da concentração administrada podem provocar reações adversas ou intoxicações. A inclusão desses agentes na fórmula de um medicamento deve seguir rigorosamente os parâmetros de eficácia e segurança, garantindo assim proteção antimicrobiana máxima sem provocar danos aos usuários. Por essas razões, este estudo teve como objetivo analisar os p

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21

Ostrosky, Elissa Arantes. "Avaliação da eficácia e segurança do extrato de folhas de Rubus rosaefolius Sm. visando a aplicação como conservante em produtos cosméticos." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/9/9139/tde-28092009-105736/.

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Os produtos cosméticos e farmacêuticos contendo componentes de origem natural têm aumentado significativamente nos últimos anos. Com o objetivo de utilizar esses componentes como conservante em formulações cosméticas, determinou-se a atividade antimicrobiana do extrato bruto de folhas de Rubus rosaefolius Sm. e suas frações. Aquele de melhor desempenho foi avaliado quanto à toxicidade in vitro e seu comportamento em formulações cosméticas (creme, gel e xampu), relacionado à estabilidade, eficácia do sistema conservante e compatibilidade epidérmica. A atividade antimicrobiana foi determinada pe

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22

Garcia, Marcelle Oliveira. "Atividade antimicrobiana de extratos e óleos essenciais de araçá (Psidium cattleianum S.) e pitanga (Eugenia uniflora L.) sobre patógenos de origem alimentar." Universidade Federal de Pelotas, 2018. http://guaiaca.ufpel.edu.br:8080/handle/prefix/4120.

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Submitted by Gabriela Lopes (gmachadolopesufpel@gmail.com) on 2018-08-13T19:13:59Z No. of bitstreams: 1 Dissertação_garcia_marcelle_oliveira.pdf: 1055386 bytes, checksum: 1f647fb5a10c4cf0687a2319f62ebb9b (MD5)<br>Approved for entry into archive by Aline Batista (alinehb.ufpel@gmail.com) on 2018-08-16T19:38:42Z (GMT) No. of bitstreams: 1 Dissertação_garcia_marcelle_oliveira.pdf: 1055386 bytes, checksum: 1f647fb5a10c4cf0687a2319f62ebb9b (MD5)<br>Made available in DSpace on 2018-08-16T19:38:42Z (GMT). No. of bitstreams: 1 Dissertação_garcia_marcelle_oliveira.pdf: 1055386 bytes, checksum: 1f64

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23

XIE, DING-HONG, and 謝定宏. "Antimicrobial activity of some preservatives on Listeria monocytogenes." Thesis, 1992. http://ndltd.ncl.edu.tw/handle/69759166986862380863.

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碩士<br>國立臺灣大學<br>食品科技研究所<br>80<br>Listeria monocytogenes是一種可以藉著食物傳染之病原菌，本研究乃在探討三種常用的防腐：propyl paraben,Na-nitrite 及Na-dehydroacetate 對L. monocytogenes Scott A,Vz、V37CE 之抗菌活性。試驗結２困顯示在所試之三種防腐劑中，所試之三株L.monocyto-qenes對propyl paraben 之抗菌作用最為敏感。在tryptose broth中，含量高達4000ppm之Na-nitrite 或Na-DHA無論在4℃ 或37℃下，對L. monocytogenes均未顯現出顯著之抗囷作用。在tryptose broth中添加200ppm或以上之propyl paraben即能部份或完全抑制 L. monocytogenes在37℃下之生長；而在4 ℃時，100ppm propyl paraben 即造成部份L. monocytogenes菌體之死亡。在

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24

Curtin, Anna. "Mitigating biofouling on reverse osmosis membranes via greener preservatives." Thesis, 2020. http://hdl.handle.net/1828/12101.

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Water scarcity is an issue faced across the globe that is only expected to worsen in the coming years. We are therefore in need of methods for treating non-traditional sources of water. One promising method is desalination of brackish and seawater via reverse osmosis (RO). RO, however, is limited by biofouling, which is the buildup of organisms at the water-membrane interface. Biofouling causes the RO membrane to clog over time, which increases the energy requirement of the system. Eventually, the RO membrane must be treated, which tends to damage the membrane, reducing its lifespan. Additiona

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25

Neves, Ana Maria da Silva. "Caracterização e avaliação das propriedades dos óleos essenciais Thymus caespititius e Thymbra capitata em preparações tópicas." Master's thesis, 2016. http://hdl.handle.net/10451/27681.

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Tese de mestrado, Medicamentos à Base de Plantas, Universidade de Lisboa, Faculdade de Farmácia, 2016<br>Today, consumers are looking for effective, safe and natural products that contribute to your health, wellness and beauty. As a result, the consumer created the need to develop new cosmetic products formulated with natural ingredients such as essential oils. These are complex mixtures of volatile, odoriferous and lipophilic secondary metabolites which are biosynthesized in specialized cells (secretory cells, epidermal cells, glandular trichomes), mainly present in aromatic plants. As natura

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26

Derbassi, Nabila Ben. "Arbutus unedo leaf extracts as potential preservatives for quark cheese." Master's thesis, 2020. http://hdl.handle.net/10198/23942.

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Mestrado de dupla diplomação com o Institut Superieur de Biotechnologie de Monastir<br>The plant kingdom is an endless source of molecules that can be applied in almost all realms of society. The food industry has profited from the use of plants and their derived materials for many decades. Recently, the food industry has been looking into plants to find different ways of either preserving, coloring or sweetening foods. These natural food additives have become a recent trend, and consumers are preferring them over synthetic and artificial food additives due to harmful effects related to their

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