Departamento de Ciencia y Tecnología, Universidad Nacional de Quilmes, Roque Sáenz Peña 352, (B1876BXD) Bernal, Buenos Aires, Argentina; Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Godoy Cruz 2290 (C1425FQB), Ciudad Autónoma de Buenos Aires (CABA), Argentina.
Departamento de Ciencia y Tecnología, Universidad Nacional de Quilmes, Roque Sáenz Peña 352, (B1876BXD) Bernal, Buenos Aires, Argentina.
Food Chem. 2022 Mar 15;372:131346. doi: 10.1016/j.foodchem.2021.131346. Epub 2021 Oct 7.
The symbiotic community of bacteria and yeast (SCOBY) of Kombucha beverage produces a floating film composed of bacterial cellulose, a distinctive biobased material. In this work, Kombucha fermentation was carried out in six different herbal infusions, where SCOBY was able to synthesise cellulosic films. Infusions of black and green tea, yerba mate, lavender, oregano and fennel added with sucrose (100 g/l) were used as culture media. In all cultures, film production resulted in a maximum after 21 days. Yield conversion, process productivity and antioxidant activity were quantified. Macroscopic and microscopic features of films were determined based on electronic microscopy, calorimetric and mechanical properties and hydration behaviour. Native films from yerba mate had a remarkable antioxidant activity of 93 ± 4% of radical inhibition due to plant polyphenols, which could prevent food oxidation. Results revealed that films retained natural bioactive substances preserving important physicochemical properties, essential for developing active materials.
康普茶饮料中的细菌和酵母共生群落（SCOBY）会产生一种由细菌纤维素组成的漂浮薄膜，这是一种独特的生物基材料。在这项工作中，在六种不同的草药浸液中进行了康普茶发酵，SCOBY 能够在其中合成纤维素薄膜。浸液由黑茶和绿茶、马黛茶、薰衣草、牛至和茴香组成，并添加了蔗糖（100 g/l）作为培养基。在所有培养物中，薄膜的产量在 21 天后达到最大值。转化率、过程生产力和抗氧化活性都进行了定量分析。基于电子显微镜、量热法和机械性能以及水合行为，确定了薄膜的宏观和微观特征。由于植物多酚的存在，来自马黛茶的天然薄膜具有显著的抗氧化活性，自由基抑制率为 93±4%，可以防止食物氧化。结果表明，薄膜保留了天然生物活性物质，保持了重要的物理化学性质，这对于开发活性材料至关重要。
