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Effect of Storage Conditions on Phenolic Profiles and Antioxidant Activity of Litchi Pericarp

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Effect of Storage Conditions on Phenolic Profiles and Antioxidant Activity of Litchi Pericarp

Mei Deng et al. Molecules.

Abstract

Changes of phenolic profiles and antioxidant activity of litchi pericarp during storage at 4 °C for seven days and at room temperature (RT) for 72 h were evaluated in this study. The contents of total phenolic and procyanidin decreased by 20.2% and 24.2% at 4 °C and by 37.8% and 47.8% at RT, respectively. Interestingly, the corresponding reductions of anthocyanins were 41.3% and 73%, respectively. Four phenolic compounds, including epicatechin, procyanidin A₂, procyanidin B₂, and quercetin-3-O-rutinoside-7-O-α-l-rhamnosidase were detected in litchi pericarp. Their contents after storage at 4 °C and at RT were decreased by 22.1⁻49.7% and 27.6⁻48.7%, respectively. The oxygen radical absorbance capacity (ORAC) and cellular antioxidant activity (CAA) of litchi pericarp decreased by 17.6% and 58.7% at 4 °C, and by 23.4% and 66.0% at RT, respectively. The results indicated that storage at 4 °C preserved more phenolics and retained higher antioxidant activity in litchi pericarp compared to storage at RT, suggesting that storage at 4 °C should be considered as a more effective method for slowing down the degradation of litchi pericarp phenolics.

Keywords: cellular antioxidant activity; litchi pericarp; phenolic compounds; storage.

Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Changes of total contents of phenolic, procyanidin, and anthocyanin in litchi pericarp during storage at 4 °C (A) and at room temperature (RT) (27 ± 2 °C) (B). Values are expressed as means ± SD, n = 3. Different letters at different storage time are significantly different, p < 0.05.
Figure 2
Figure 2
HPLC chromatograms for procyanidin compounds detection (A) and flavonoid compounds detection (B) in litchi pericarp.
Figure 3
Figure 3
Changes of oxygen radical absorbance capacity (ORAC) and cellular antioxidant activity (CAA) antioxidant activity of litchi pericarp stored at 4 °C (A) and at RT (27 ± 2 °C) (B). Values are expressed as mean ± SD (n = 3). Bars with no letters in common are significantly different, p < 0.05.

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