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Extracellular pH imaging of a plant leaf with a polyelectrolyte multilayered nanosheet

机译:带有聚电解质多层纳米片的植物叶片的细胞外pH成像

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We have developed a sheet-like pH imaging sensor based on a flexible and physically adhesive polymer thin film (referred to as a “pH sensing nanosheet”). The pH sensing nanosheet was composed of two films: one is a pH-sensitive layer-by-layer (LbL) film constructed from fluorescein-conjugated poly(acrylic acid) and poly(allylamine hydrochloride) and the other is a pH-insensitive film made from Nile red-embedded poly( D , L -lactic acid). The pH sensing nanosheet enabled the ratiometric imaging of pH changes in a leaf (500 × 500 μm ~(2) ), namely the apoplastic ion milieu responding to an external NaCl stress. It was successfully mapped out that the alkalization of the leaf apoplast spread from the leaf base to the tip at 20 min after the stimulation and the pH value increased up to approximately pH 6.3 from less than pH 4.5 within 60 min when a 100 mM NaCl aqueous solution was added. The pH sensing nanosheet should be useful for energy metabolic mapping in tissue biology.
机译:我们已经开发了一种基于柔性且物理粘合的聚合物薄膜的片状pH成像传感器(称为“ pH传感纳米片”)。 pH敏感纳米片由两层膜组成:一层是由荧光素共轭的聚丙烯酸和聚烯丙胺盐酸盐构成的pH敏感层(LbL)膜,另一层是pH敏感膜由尼罗河红包埋的聚(D,L-乳酸)制成。通过pH传感纳米片,可以对叶子(500×500μm〜(2))中的pH变化进行比例成像,即响应外部NaCl胁迫的质外离子环境。成功绘制出在刺激后20分钟时叶质外体的碱化作用从叶基向叶尖蔓延,当使用100 mM NaCl水溶液时,pH值在60分钟内从低于pH 4.5升高到大约pH 6.3。解决方案已添加。 pH传感纳米片应可用于组织生物学中的能量代谢作图。

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