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Modelling the recovery of biocompounds from peach waste assisted by pulsed electric fields or thermal treatment
Journal of Food Engineering ( IF 5.5 ) Pub Date : 2021-02-01 , DOI: 10.1016/j.jfoodeng.2020.110196
S. Plazzotta , R. Ibarz , L. Manzocco , O. Martín-Belloso

Abstract The recovery of non-purified bioactive extracts (70% ethanol) from peach pomace (PP) was assisted by conventional thermal treatment (CTT, 50 °C up to 90 min) or pulsed electric fields (PEF, specific energy input, EV, of 0.0014–2.88 kJ/kg). The maximum concentration of biocompounds and antioxidant activity, assessed with spectrophotometric and HPLC methods, was obtained upon 40 min by CTT and 0.0014 kJ/kg by PEF, which took 16 μs. A two-step mechanism was proposed when CTT was applied, considering a first step (zero-order kinetic) in which the PP biocompounds were released into the extraction media and a second degradation stage (first-order). A significant relationship was found between EV and PP biocompound degradation during PEF extraction, and a two-term degradation model was proposed to explain obtained data. The CTT or PEF-assisted recovery of biocompounds from PP was adequately explained by the proposed mechanistic and empirical kinetic models, which are feasible tools to understand the involved phenomena in the extraction procedures.

中文翻译:

模拟从脉冲电场或热处理辅助的桃废物中回收生物化合物

摘要 通过常规热处理(CTT,50 °C 长达 90 分钟)或脉冲电场(PEF,比能量输入,EV, 0.0014–2.88 kJ/kg)。使用分光光度法和 HPLC 方法评估的生物化合物和抗氧化活性的最大浓度是在 40 分钟时通过 CTT 获得的,通过 PEF 获得 0.0014 kJ/kg,需要 16 μs。当应用 CTT 时,提出了一个两步机制,考虑到第一步(零级动力学),其中 PP 生物化合物被释放到提取介质中,第二步降解阶段(一级)。在 PEF 提取过程中发现 EV 和 PP 生物化合物降解之间存在显着关系,并提出了一个两项降解模型来解释获得的数据。
更新日期:2021-02-01
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