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Table 2 The contents of COPs under different pH condition after storage at 4 °C for 10 days

From: Monitoring the formation of cholesterol oxidation products in model systems using response surface methodology

Treatment COPs (mg) Control pH 5.8 pH 6.7 pH 7.6
7β-OH Nd nd nd nd
20α-OH* 0.51 ± 0.07a 0.43 ± 0.02ab 0.37 ± 0.01b 0.38 ± 0.06b
25-OH*** 0.13 ± 0.01a 0.07 ± 0.01b 0.06 ± 0.00b 0.06 ± 0.02b
Triol*** 0.02 ± 0.00a n.d.b n.d.b n.d.b
α-epoxide 0.04 ± 0.01 0.03 ± 0.01 0.03 ± 0.01 0.03 ± 0.00
7-keto Nd nd nd nd
Total amount of COPs/cholesterol (%) ** 1.40 ± 0.17a 1.06 ± 0.08b 0.91 ± 0.05b 0.95 ± 0.16b
  1. 7β-OH 7β-hydroxycholesterol, 20α-OH 7α-hydroxy-cholesterol, 25-OH 25-hydroxycholesterol, Triol Cholestanetriol, α-epoxide 5,6α-epoxycholesterol, 7-keto 7-ketocholesterol
  2. *: P < 0.05, **: P < 0.01, ***: P < 0.001
  3. a, b Means ± SE with different superscript in the same row differ significantly