Isolated tomato fruit cuticles were subjected to low dose (80Gy) γ-irradiation, as a potential methodology to prevent harvested fruit and vegetables spoilage. Both irradiated and non-irradiated samples have been morphologically and chemically characterized by scanning electron (SEM), atomic force (AFM), attenuated total reflectance Fourier transform infrared (ATR-FTIR) and X-ray photoelectron (XPS) spectroscopies. Additionally, electrochemical measurements comprising membrane potential and diffusive permeability were carried out to detect modifications in transport properties of the cuticle as the fruit primary protective membrane. It has been found that low dose γ-irradiation causes some textural changes on the surface but no significant chemical modification. Texture modification is found to be due to a partial removal of outermost (epicuticular) waxes which is accompanied by mild changes of electrochemical parameters such as the membrane fixed charge, cation transport number and salt permeability. The modification of such parameters indicates a slight reduction of the barrier properties of the cuticle upon low dose γ-irradiation.

译文

:对分离的番茄果实表皮进行低剂量(80Gy)γ射线照射,作为防止收获的水果和蔬菜变质的潜在方法。通过扫描电子(SEM),原子力(AFM),衰减的全反射傅立叶变换红外光谱(ATR-FTIR)和X射线光电子(XPS)光谱学,对经过辐照和未经辐照的样品进行了形态和化学表征。另外,进行了包括膜电位和扩散渗透性的电化学测量,以检测作为水果主要保护膜的角质层的转运性质的改变。已经发现,低剂量的γ射线辐照会在表面上引起一些纹理变化,但是没有明显的化学修饰。发现结构改性是由于最外层(蜡状)蜡的部分除去,同时伴随着电化学参数的温和变化,例如膜固定电荷,阳离子迁移数和盐渗透性。对这些参数的修改表明在低剂量γ辐照下,表皮的阻隔性能略有降低。

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