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Enhancing antimicrobial efficacy of sodium benzoate / Stephen Foster in SOFW JOURNAL, Vol. 146, N° 10 (10/2020)
[article]
Titre : Enhancing antimicrobial efficacy of sodium benzoate Type de document : texte imprimé Auteurs : Stephen Foster, Auteur ; Pawel Rempala, Auteur ; Daniel Mueller, Auteur ; Lauren Dornan, Auteur ; Amber Yarnell, Auteur ; Jenna Blankenship, Auteur Année de publication : 2020 Article en page(s) : p. 8-14 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Antimicrobiens
Benzoate de sodiumLe benzoate de sodium, de formule chimique (Na+ + C6H5COO-)(NaC6H5COO) est le sel de sodium de l'acide benzoïque, connu sous le nom E211 comme additif alimentaire. Soluble à raison de 640 parts pour 1000 d'eau à 25 °C. Il précipite en présence d'un acide concentré (ex.: l'acide sulfurique concentré) en donnant de l'acide benzoïque (très peu soluble dans l'eau) dont on peut analyser plus facilement le point de fusion. Sa dissolution aqueuse engendre une augmentation du pH.
L'acide benzoïque est produit industriellement selon 3 voies :
1. Oxydation de naphtalène en anhydride phtalique en présence de catalyseur oxyde de vanadium. L'anhydride phtalique est ensuite décarboxylé produisant l'acide benzoïque.
2. Oxydation d'un mélange de toluène et d'acide nitrique produisant l'acide benzoïque.
3. Hydrolyse du trichlorobenzène produisant l'acide benzoïque.
L'acide benzoïque est ensuite dissout dans une solution d'hydroxyde de sodium pour former du benzoate de sodium.
Le benzoate de sodium est utilisé comme conservateur alimentaire, autorisé sous condition et référencé en Europe sous le code E211.
Détergents
Produits nettoyantsIndex. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : In many cleaning product applications in the market place, the inclusion of sodium benzoate as a stand-alone preservative is providing sufficient microbial control. It was observed that inclusion levels are typically lower, resulting in economical use and, consequently, feasibility in a wider pH range of cleaning products compared to what was generally believed. For sodium benzoate
to effectively preserve, formulations require sufficient concentrations of the undissociated organic acid, which is benzoic acid. The acid equilibrium constant (pKa) of benzoic acid determines the degree of acid dissociation, and a larger value would result in increased benzoic acid concentrations. Titrations show that in the presence of home care surfactants, the apparent pK’a increases as surfactant concentration increases, indicating a higher concentration of the active substance. This was confirmed with 13CNMR. Microbial challenge testing was performed to verify that the increased apparent pK’a yields increased antimicrobial efficacy. A surfactant was selected to increase the benzoic apparent pK’a with substantial improvements in microbe reductions versus controls. Finally, a theoretical model based on surfactant properties was adopted to explain the observed pK’a increases. This model provides a basis for detailed formulation advice and justification to the enhanced antimicrobial efficacy of Kalaguard® SB sodium benzoate.Note de contenu : - BACKGROUND : Mechanisms for antimicrobial action and pK' a shifts
- EXPERIMENTAL :
- RESULTS AND DISCUSSION : Observing increased antimicrobial efficacy - Measuring pK'a with 13CNMR - Modelling apparent pK'a values based on micelle partitioning
- Fig. 1 : Microbial counts in colony forming units (CFU) for Escherichia coli, Pseudomonas aeruginosa, and Aspergillus brasiliensis of hand diswash formulation pH 6.0.
- Fig. 2 : The apparent pK'a of benzoic acid increased with the concentration of various surfactants
- Fig. 3 : 13CNRM chemical shift of the carbon atom within the carboxyl functional group of sodium benzoate/benzoic acid at various pH levels
- Fig. 4 : Fraction of undissociated benzoic acid calculated from 13CNMR chemical shift data at various pH
- Fig. 5 : Depiction of the equilibrium between base and acid dissolved in water and acid incorporated into the micelle core
- Fig. 6 : Graph of apparent pK'a versus LAS concentration from experimentally measured and theoretically derived values from equation 2
- Table 1 : Log reduction of microbes in soy broth at pH 6.5 at 14 days, demonstrating that sodium benzoate combined with SLMI surfactant resulted in greater antimicrobial efficacy
- Table 2 : pK'a interpolated from benzoic acid 0.5 molar fraction using 13CNMR data in Fig. 4
- Equation 1 : Determination of benzoic acid dissociation (ionization) degree α from the carboxyl carbon chemical shift
- Equation 2 : Apparent pK'a of benzoic acid withsurfactants. For full derivation on details, please contact authorEn ligne : https://drive.google.com/file/d/1_JnUEMJ69pY7SlWH5_83hX1UNS7aGWNQ/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34594
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Code-barres Cote Support Localisation Section Disponibilité 22345 - Périodique Bibliothèque principale Documentaires Disponible Enhancing surface durability with antimicrobial coatings / James Rapley in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 212, N° 4676 (08/2022)
[article]
Titre : Enhancing surface durability with antimicrobial coatings Type de document : texte imprimé Auteurs : James Rapley, Auteur Année de publication : 2022 Article en page(s) : p. 23-25 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Antimicrobiens
Formulation (Génie chimique)
Revêtements -- Industrie et commerce
Surfaces -- NettoyageIndex. décimale : 667.9 Revêtements et enduits Résumé : The author discusses the market for and development of antimicrobial coatings.
The need for durable and more environmentally friendly solutions for coating materials has been shaping the coatings industry for many years. Consumers from various markets, including the construction trade and automotive manufacturing, want coatings that enhance the resilience of surfaces to stains, dirt, and mildew. However, even with the addition of protectants and decorative paints or lacquers, microbes are still able to adhere to a surface, where they can multiply rapidly. Their uncontrolled growth and spread as a result of contact, environmental conditions or inadequate cleaning (Figure 1) can then lead to unpleasant consequences, including spoilage, stains, nasty odours and a reduction in the usable lifetime of a product due to contamination or biodegradation.
There are a number of treatments that consumers can use to help reduce the growth and spread of microbes on surfaces, and using them regularly is essential. However, standard cleaning products often have limited residual activity, meaning that they stop working once they dry. This can allow surfaces to become quickly re-contaminated by contact or airborne sources, which is a particular concern for high-touch points such as countertops and doors.
Antimicrobial technologies in coatings can help to address these challenges by effectively creating a protective layer that keeps surfaces cleaner and fresher for longer. This 'always on' protection works around the clock to help prevent the growth of microbes on a surface for the lifetime of the coating, without washing or wearing away. For just a minimal cost, this universel lifetime preventative measure provides the perfect complement to standard routine cleaning practices, employing a multi-defence strategy against the growth of microbes to improve overall surface cleanliness.Note de contenu : - A growing market
- Developing antimicrobial coatings : Choosing the right antimicrobial - Compatibility - Application
- The future is cleaner
- Fig. 1 : Example of surfaces that are susceptible to microbial growth
- Fig. 2 : Choosing an antimicrobial that is compatible with the coating is essential. Left: polyurethane chemistry mixed with an incompatible antimicrobial leads to visuat defects after drying. Right: turnkey coatings are compatible with a wide range of chemistries and have minimal visual impact
- Fig. 3 : Current powder or pre-dispersion coating manufacturing process
- Fig. 4 : Liquid, dispersion, powder and turnkey coating before and after 72 hours has elapsed. Precipitation and agglomeration start to occur after 72 hours ; the turnkey coating solution remains stable
- Fig. 5 : Fully integrated antimicrobial technology in coatingsEn ligne : https://drive.google.com/file/d/1Ub9MFE1gCgpalSax1V52jjGU9m0ywIoi/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37869
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Code-barres Cote Support Localisation Section Disponibilité 23537 - Périodique Bibliothèque principale Documentaires Disponible Essential oils and sustainability in cosmetic industry - a brief review / Stamatia Christaki in SOFW JOURNAL, Vol. 148, N° 9 (09/2022)
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Titre : Essential oils and sustainability in cosmetic industry - a brief review Type de document : texte imprimé Auteurs : Stamatia Christaki, Auteur ; Anas Putriss, Auteur ; Katerina Vasilatou, Auteur ; Ioannis Mourtzinos, Auteur Année de publication : 2022 Article en page(s) : p. 34-40 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Antimicrobiens
Antioxydants
Cheveux -- Soins et hygiène
Durée de vie (Ingénierie)
Huiles essentielles
Ingrédients cosmétiques
Parfums
Peau -- Soins et hygiène
Produits capillairesIndex. décimale : 668.5 Parfums et cosmétiques Résumé : The current demands of the global market aiming to a more sustainable way of life is pushing cosmetic industry towards a major change regarding raw materials and production practices. Essential oils from aromatic and medicinal plants have been used for cosmetic purposes since ancient times, as their bioactive compounds are responsible for some important biological activities. Nowadays, the interest for essential oils is steadily rising and their use as natural bioactive ingredients or as antimicrobial factors in cosmetic formulations has increased. Although the origin of essential oils is natural, their sustainability is often questioned due to non-cost effective production processes. In this paper we present the potential uses of essential oils as ingredients in cosmetics in a more holistic way and we try to draw the line between the terms “natural” and "sustainable". Note de contenu : - Essential oils from aromatic plants : Antimicrobial activity - Antioxidant activity
- Market demand and production of essential oils for the cosmetic industry
- Natural vs sustainable : a current challenge
- essential oils as ingredients for sustainable cosmetics : Perfumes - Skin care - Hair care
- Table 1 : Types of perfumes
- Table 2 : Essential oils commonly used in hair productsEn ligne : https://drive.google.com/file/d/14dsJ9Cuu5QM4AgNuACWWlvMLF5F8LLAd/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38062
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Code-barres Cote Support Localisation Section Disponibilité 23576 - Périodique Bibliothèque principale Documentaires Disponible Ethylhexylglycerin respect the microbiome / Matthias Hentz in GLOBAL PERSONAL CARE, Vol. 22, N° 8 (09/2021)
[article]
Titre : Ethylhexylglycerin respect the microbiome Type de document : texte imprimé Auteurs : Matthias Hentz, Auteur Année de publication : 2021 Article en page(s) : p. 70-72 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Antimicrobiens
Cosmétiques
Déodorants
EthylhexylglycérineL'éthylhexylglycérine ou octoxyglycérine , est un éther glycérylique couramment utilisé dans le cadre d'un système de conservation dans les préparations cosmétiques.
Formulation (Génie chimique)
Ingrédients cosmétiques
Microbiome cutané
Peau -- Soins et hygièneIndex. décimale : 668.5 Parfums et cosmétiques Résumé : Ashland present Ethylhexylglycerin and show how its multifunctional qualities enable it to boost antimicrobial performance while protecting the microbiome.
"Increased stress due to COVID-19 will draw more consumers to sensitive skin care products, which they believe are safer for skin".
The COVID-19 pandemic, and now its variants, has focused the world’s attention on disinfectants and wash products. Prevention of contamination on the skin has never been more important to manufacturers and consumers. With an increase in hygiene measures, the skin may suffer. Dryness, redness, or irritation and more call for nourishing and caring routines to manage both possible contaminations and a healthy skin flora. It is therefore expected that 'sensitive skin' claims will gain high attention across regions.
The increased consumption of disinfectants and cleansing formulas certainly has a negative influence on the skin flora. But how about ingredients that are designed to inhibit the growth of microorganisms to protect valuable products like cosmetics from deterioration and consumers from unwanted infections by pathogens ? It could be assumed that these ingredients can have an influence on the microorganisms not only in the cosmetic product, but also on the skin microorganisms.Note de contenu : - Microbiome
- Ethylhexylglycerin - a multifunctional for personal care formulas
- Situation of Ethylhexylglycerin
- Ethylhexylglycerin and the influence on the microbiome
- Fig. 1 : Improved efficacy of alcohols in combination with 1% ethylhexylglycerin (EHG)
- Fig. 2 : Contact angles of aqueous solutions
- Fig. 3 : List of respective perfuming ingredients
- Fig. 4 : Panel results on skin feel with and w/o ethylhexylglycerin
- Fig. 5 : Deodorising efficacy of ethylhexylglycerin
- Fig. 6 : Deodorant formulaPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36603
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Code-barres Cote Support Localisation Section Disponibilité 22883 - Périodique Bibliothèque principale Documentaires Disponible EU biocide regulation has support / Alan Osborn in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 204, N° 4599 (08/2014)
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Titre : EU biocide regulation has support Type de document : texte imprimé Auteurs : Alan Osborn, Auteur Année de publication : 2014 Article en page(s) : p. 24 Langues : Anglais (eng) Catégories : Antimicrobiens
Chimie industrielle -- Législation -- Pays de l'Union européenneIndex. décimale : 667.9 Revêtements et enduits Résumé : Although the EU biocide regulation is receiving support, there are concerns about cost and red tape. En ligne : https://drive.google.com/file/d/1B1yqQi6ybUAuH8_4KDgtmjj-Uhj-bMEg/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=21798
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Code-barres Cote Support Localisation Section Disponibilité 16462 - Périodique Bibliothèque principale Documentaires Disponible EU paint and coatings companies urged to check ECHA databases in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 206, N° 4616 (01/2016)
PermalinkPermalinkEvaluation of anti-acne properties of phloretin in vitro and in vivo / H. Kum in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Vol. 38, N° 1 (02/2016)
PermalinkEvaluation of anti-microbial activities of ZnO, citric acid and a mixture of both against Propionibacterium acnes / J. Y. Bae in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Vol. 38, N° 6 (12/2016)
PermalinkEvaluation of antimicrobial activity of Lawsonia Inermis (Henna) against microbial strains isolated from goat skin/leather / A. E. Musa in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVI, N° 5 (05/2011)
PermalinkEvaluation of antimicrobial and dyeing properties of walnut (Juglans regia L.) green husk extract for cosmetics / Tavoos Beiki in COLORATION TECHNOLOGY, Vol. 134, N° 1 (02/2018)
PermalinkEvaluation of antimicrobial effectiveness of C-8 xylitol monoester as an alternative preservative for cosmetic products / L. F. B. Amaral in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Vol. 33, N° 5 (10/2011)
PermalinkPermalinkFabrication of electrospun chitosan and chitosan/poly(ethylene oxide) nanofiber webs and assessment of their antimicrobial activity / G. Dogan in INTERNATIONAL POLYMER PROCESSING, Vol. XXVIII, N° 2 (05/2013)
PermalinkFighting germs with solar energy / Teresa Huppmann in KUNSTSTOFFE INTERNATIONAL, Vol. 104, N° 5 (05/2014)
PermalinkFighting infection : the value and scope of hygiène coatings / C. Lloyd in SURFACE COATINGS INTERNATIONAL, Vol. 96, 4 (08/2013)
PermalinkFormulating coatings with silver-based antimicrobials : a systematic approach / Kurt Davidson in COATINGS TECH, Vol. 4, N° 1 (01/2007)
PermalinkFormulation and testing of a slow-release antimicrobial paint: a case study of antifungi and antialgae activity for interior and exterior applications / Amir S. Kazemi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 2 (03/2023)
PermalinkFormulation of topical acidic products and acidification of the skin – Contribution of glycolic acid / Milica Lukic in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Vol. 43, N° 4 (08/2021)
PermalinkFrom directive to regulation / Keith Nuthall in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 200, N° 4544 (01/2010)
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