AbstractA 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.
摘要 开发了一种以酪醇和亲脂性羧酸为原料合成生物活性羟基酪醇酯的单锅策略,该策略是将多酶级联固定在具有电活性的黑色素木质素纳米颗粒上。这种新型催化剂将脂肪酶和酪氨酸酶共同固定在多酚载体上,并可在可持续的 2-甲基四氢呋喃作为有机反应溶剂的情况下工作。该系统在选择性合成儿茶酚时无需使用额外的还原剂。光电和电化学研究表明,黑色素木质素纳米颗粒在将酪氨酸酶的活性位点从非生产性的金属形式再生为可逆的乙氧基/氧形式方面发挥了作用。这种作用提高了酪氨酸酶在多酶级联中的整体活性,有利于将不需要的醌还原为相应的儿茶酚。