Table 3 The HPLC analysis of triterpenoids and organic acids (including ascorbic acid) in the of Papierowka and Gold Milenium apple peels [mg/g d.w. extract or peel].

From: Phenolic content, chemical composition and anti-/pro-oxidant activity of Gold Milenium and Papierowka apple peel extracts

 

Papierowka

Gold Milenium

Ultrasound

Conventional

Ultrasound

Conventional

mg/g d.w. extract

mg/g d.w. peel

mg/g d.w. extract

mg/g d.w. peel

mg/g d.w. extract

mg/g d.w. peel

mg/g d.w. extract

mg/g d.w. peel

Triterpenoids

Betulinic acid

0.145 ± 0.032*

0.053 ± 0.015

0.180 ± 0.0159

0.059 ± 0.009

0.058 ± 0.003

0.021 ± 0.001

0.040 ± 0.005

0.013 ± 0.001

Oleanolic acid

0.085 ± 0.007

0.020 ± 0.001

0.097 ± 0.010

0.032 ± 0.006

0.156 ± 0.002

0.039 ± 0.006

0.194 ± 0.019

0.064 ± 0.007

Ursolic acid

3.507 ± 0.102

1.351 ± 0.083

3.373 ± 0.027

1.107 ± 0.113

1.638 ± 0.006

0.324 ± 0.022

2.090 ± 0.018

0.688 ± 0.063

Organic acids

Tertaric acid

3.748 ± 0.034

1.353 ± 0.172

5.283 ± 0.074

1.741 ± 0.153

0.0710 ± 0.054

0.256 ± 0.020

0.100 ± 0.0161

0.033 ± 0.005

Malic acid

55.709 ± 0.118

20.086 ± 2.383

66.523 ± 0.718

21.929 ± 2.150

24.318 ± 0.819

8.783 ± 0.296

15.595 ± 0.031

5.138 ± 0.010

Ascorbic acid

0.016 ± 0.000

0.006 ± 0.001

0.000

0.000

0.014 ± 0.001

0.005 ± 0.000

0.000

0.000

Citric acid

1.006 ± 0.135

0.408 ± 0.099

1.540 ± 0.115

0.457 ± 0.041

0.278 ± 0.009

0.101 ± 0.003

0.253 ± 0.143

0.083 ± 0.047

Quinic acid

48.007 ± 0.076

17.310 ± 2.068

67.626 ± 0.645

22.306 ± 2.405

10.412 ± 0.100

3.760 ± 0.036

1.926 ± 0.027

0.635 ± 0.009

  1. *Mean values from three independent experiments ± SD are shown.
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