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Effect of atmospheric pressure and composition on β-carotene concentration in sweet potatoes stored at 20 °C for 11 days. Control: P = 1 bar, PO2 = 0.21 bar; normobaria/hypoxia: P = 1 bar, PO2 = 0.04 bar; hypobaria/hypoxia: P = 0.4 bar, PO2 = 0.02 bar; hyperbaria/anoxia: P = 5 bar, PO2 = 0 bar, hyperbaria/hyperoxia: P = 5 bar, PO2 = 1.05 bar. Values are the means with their SEM represented by vertical bars (n = 5).
