Bioaccessibility of Bioactive Compounds and Antioxidant Capacityfrom Orange Peel after Pulsed Electric Fields and High Voltage Electrical Discharges

Abstract

In the present study changes of bioactive compounds and antioxidant capacity in orange peel treated by pulsed electric fields (PEF), high voltage electrical discharges (HVED) at two equivalent energy inputs (55-364 kJ/kg) as well as relative bioaccessibility was evaluated. PEF treatment led to decrease in ascorbic acid when energy input increased. Moreover TPC after PEF and HVED treatments increased significantly with higher energy input applied. By contrast, HVED at 364 kJ/kg diminished carotenoids content. The relative bioaccessibility of carotenoids after HVED (55 kJ/kg)was 75.3%. When increasing the energy input from 55 to 364 kJ/kg in HVED the bioaccessibility percentage of carotenoids increased in a 82.5%. On the other hand TPC bioaccessibility for PEF at lower energy input was 40.7%. However increasing the energy input to 364 kJ/kg led to decrease of the TPC independently of treatment applied. Consequently, results indicated that non thermal treatments such as (PEF, HVED) can enhance the release of bioactive compounds and total antioxidant capacity after in vitrogastrointestinal digestion in orange peel. However, further research is required tooptimize processing conditions. In the present study changes of bioactive compounds and antioxidant capacity in orange peel treated by pulsed electric fields (PEF), high voltage electrical discharges (HVED) at two equivalent energy inputs (55-364 kJ/kg) as well as relative bioaccessibility was evaluated. PEF treatment led to decrease in ascorbic acid when energy input increased. Moreover TPC after PEF and HVED treatments increased significantly with higher energy input applied. By contrast, HVED at 364 kJ/kg diminished carotenoids content. The relative bioaccessibility of carotenoids after HVED (55 kJ/kg)was 75.3%. When increasing the energy input from 55 to 364 kJ/kg in HVED the bioaccessibility percentage of carotenoids increased in a 82.5%. On the other hand TPC bioaccessibility for PEF at lower energy input was 40.7%. However increasing the energy input to 364 kJ/kg led to decrease of the TPC independently of treatment applied. Consequently, results indicated that non thermal treatments such as (PEF, HVED) can enhance the release of bioactive compounds and total antioxidant capacity after in vitro gastrointestinal digestion in orange peel. However, further research is required tooptimize processing conditions.