Extraction Using Moderate Electric Fields
Extraction Using Moderate Electric Fields
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使用中等电场提取
DOI：
10.1111/j.1365-2621.2004.tb17861.x
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发表时间：
2004
期刊：
影响因子：
--
通讯作者：
S. Sastry
中科院分区：
文献类型：
--
作者：
I. Şensoy;S. Sastry
在中等电场（MEF）处理过程中，施加在食品材料上的电压可能会影响细胞膜的渗透性。已知高电场可引起细胞膜的可逆或不可逆破裂。在这项研究中，MEF处理对渗透率的影响进行了研究。频率和电场强度的影响进行了研究。透射电子显微镜（TEM）研究细胞结构。根据实验，将发酵的黑十叶和新鲜或干燥的薄荷叶置于茶袋中或切成1cm 2的正方形，并浸入水性流体介质中。在热板上加热对照样品。MEF处理通过在浸入烧杯相对侧的电极上施加电压来进行。通过TEM分析加热至50 °C的对照和MEF处理的新鲜薄荷叶样品。MEF处理显著提高了新鲜薄荷叶的提取率，因为在加热过程中额外的电场效应。干薄荷叶和发酵红茶叶不受影响，由治疗类型。低频率导致较高的提取率新鲜薄荷叶。电场强度研究表明，即使在低电场强度下也能实现电击穿。MEF处理显示出可用作从细胞材料中提取的常规加热的替代方案的潜力。
During moderate electric field (MEF) processing, a voltage applied across a food material may affect the permeability of cell membranes. It is known that high electric fields can cause either reversible or irreversible rupture of cell membranes. In this research, the effect of MEF processing on permeability was studied. Effects of frequency and electric field strength were investigated. Cellular structure was investigated by transmission electron microscopy (TEM). Fermented black ten leaves and fresh or dry mint leaves were placed in tea bags or cut in 1 cm 2 squares, depending on the experiment, and immersed in an aqueous fluid medium. Control samples were heated on a hot plate. MEF treatments were conducted by applying a voltage across electrodes immersed in opposite sides of the beaker. Control and MEF-treated fresh mint leaf samples heated to 50 °C were analyzed by TEM. MEF processing significantly increased the extraction yield for fresh mint leaves because of additional clectric field effects during heating. Dried mint leaves and fermented black tea leaves were not affected, by the treatment type. Low frequency resulted in higher extraction rates for fresh mint leaves. The electric field strength study showed that electrical breakdown is achieved even at low electric field strengths. MEF treatment shows potential to be used as an alternative to conventional heating for extraction from cellular materials.