Variations of Bioactive Phytochemicals and Antioxidant Capacity of Navel Orange Peel in Response to Different Drying Methods.

The effects of five different drying methods, namely, freeze drying (FD), shade drying (SD), hot-air oven drying at 50 °C (OD50), 70 °C (OD70), and microwave drying (MD) on the bioactive phytochemicals and antioxidant capacity of navel orange peel were assessed and comprehensively discussed in detail. Compared with other drying methods, MD-treated peel contained the lowest total phenolic content (TPC) and total flavonoid content (TFC). The peel subjected to OD70 treatment was superior in TPC relative to other treatments and the highest TFC was found in the peels treated with FD.

Evaluation of antibacterial activity of compounds isolated from the peel of Newhall navel orange.

Fifteen compounds including one flavanone hesperitin (), two cinnamic acid derivatives as ()-4-hydroxycinnamic acid () and ()-ferulic acid (), eight polymethoxyflavones (PMFs) (-), and four hydroxylated PMFs (-) isolated from orange peel were subjected to antibacterial evaluation. Compounds - exhibited wide-spectrum antibacterial effects against four test strains involving , , subsp. (), and Meticillin-resistant (MRSA) with minimum inhibitory concentrations (MICs) ranging from 0.