Tyrosol and hydroxytyrosol derivatives as antitrypanosomal and antileishmanial agents
作者:Efres Belmonte-Reche、Marta Martínez-García、Pablo Peñalver、Verónica Gómez-Pérez、Ricardo Lucas、Francisco Gamarro、José María Pérez-Victoria、Juan Carlos Morales
DOI:10.1016/j.ejmech.2016.04.047
日期:2016.8
Existing treatments have considerable side effects and increase resistance of the parasites. We have measured antitrypanosomal and antileishmanial activity of natural phenols, tyrosol (TYR) and hydroxytyrosol (HT) and several of their esters and metabolites. We found significant IC50 values against Trypanosoma brucei for HT decanoate ester and HT dodecanoate ester (0.6 and 0.36 μM, respectively). This represents
Enzyme catalysis: Layer-by-layer functionalized lignin nanoparticles acts as a sustainable platform in the lipase M and tyrosinase cascade synthesis of bioactive lipophilic hydroxytyrosol esters from tyrosol and long side-chain carboxylic acids under organic solvent conditions.
Synthesis of Bioactive Hydroxytyrosol Esters via Multienzyme Cascade on Electroactive Melanin Lignin Nanoparticles: A One‐Pot Approach without Extra Reducing Agents
A one‐pot strategy for the synthesis of bioactive hydroxytyrosol esters from tyrosol and lipophilic carboxylic acids has been developedviamultienzyme cascade immobilized on electroactive melanin lignin nanoparticles. The novel catalyst involved the co‐immobilization of lipase and tyrosinase on the polyphenolic support and was operative in the presence of sustainable 2‐methyltetrahydrofuran as organic reaction solvent. The system did not require the use of extra reducing agents for the selective synthesis of catechols. Optoelectronic and electrochemical studies suggested the role played by melanin lignin nanoparticles in the regeneration of the active site of tyrosinase from unproductivemet‐form to reversibledeoxy/oxy‐form. This effect improved the overall activity of tyrosinase in the multienzyme cascade favouring the reduction of undesired quinones to corresponding catechols.
Synthesis of Benzoxazines by Heterogeneous Multicomponent Biochemo Multienzymes Cascade Reaction
作者:Elisabetta Tomaino、Eliana Capecchi、Valentina Ubertini、Davide Piccinino、Bruno M. Bizzarri、Raffaele Saladino
DOI:10.1021/acs.joc.3c02314
日期:2024.2.16
This work describes the possibility to combine multicomponent chemistry and multienzymes cascade transformations in a unique reactive framework to yield highly functionalized 1,4-benzoxazines under favorable heterogeneous conditions. The synthetic scheme involved the generation in situ of electrophilic reactive quinone intermediates of tyrosol esters catalyzed by lipase M and tyrosinase followed by
这项工作描述了在独特的反应框架中结合多组分化学和多酶级联转化的可能性,以在有利的异质条件下产生高度功能化的 1,4-苯并恶嗪。该合成方案包括在脂肪酶 M 和酪氨酸酶催化下原位生成酪醇酯的亲电活性醌中间体,然后对选定的 α-氨基酸甲酯进行亲核 1,6-Michael 加成,以及连续的分子内内酯化和芳构化过程。多酶级联在电活性木质素纳米颗粒上的固定化提高了整个系统的可持续性和可回收性。
Surface-Active Properties of Lipophilic Antioxidants Tyrosol and Hydroxytyrosol Fatty Acid Esters: A Potential Explanation for the Nonlinear Hypothesis of the Antioxidant Activity in Oil-in-Water Emulsions
作者:Ricardo Lucas、Francisco Comelles、David Alcántara、Olivia S. Maldonado、Melanie Curcuroze、Jose L. Parra、Juan C. Morales
DOI:10.1021/jf1009928
日期:2010.7.14
Our group has recently observed a nonlinear tendency in antioxidant capacity of different hydroxytyrosol fatty acid esters in fish oil-in-water emulsions, where a maximum of antioxidant efficiency appeared for hydroxytyrosol octanoate. These results appear to disagree with the antioxidant polar paradox. Because the physical location of the antioxidants in an oil water interface has been postulated as an important factor in explaining this behavior, we have prepared a series of tyrosol and hydroxytyrosol fatty acid esters with different chain length and studied their surface-active properties in water, because these physicochemical parameters could be directly related to the preferential placement at the interface. We have found that tyrosol and hydroxytyrosol fatty acid esters are relevant surfactants when the right hydrophilic-lipophilic balance (HLB) is attained and, in some cases, as efficient as emulsifiers commonly used in industry, such as Brij 30 or Tween 20. Moreover, a nonlinear dependency of surfactant effectiveness is observed with the increase in chain length of the lipophilic antioxidants. This tendency seems to fit quite well with the reported antioxidant activity in emulsions, and the best antioxidant of the series (hydroxytyrosol octanoate) is also a very effective surfactant. This potential explanation of the nonlinear hypothesis will help in the rational design of antioxidants used in oil-in-water emulsions.