Changes in the Antioxidant Properties of Quince Fruit (Cydonia oblonga Miller) during Jam Production at Industrial Scale
Table 1
Polyphenols identified in quince samples.
Number
RT (min)
Compound
Molec. formula
[M−H]−(m/z) exp
Error (ppm)
MS2(m/z)
(nm)
(1)
7.2
Quinic acid
C7H11O6
191.0565
−1.9
173
223
(2)
11.0
Procyanidin dimer
C30H25O12
577.1347
0.7
289, 425, 407, 540
278
(3)
11.7
4-O-Caffeoylquinic acid
C16H17O9
353.0887
−2.5
191, 179
228, 292sh, 326
(4)
11.9
(+)
C15H13O6
289.0727
−3.4
245, 205
281
(5)
12.5
3-p-Coumaroylquinic acid
C16H17O8
337.0905
6.1
191, 173
(6)
12.6
5-O-Caffeoylquinic
C16H17O9
353.0887
−2.6
191
230, 301sh, 326
(7)
12.8
(−) Epicatechin
C15H13O6
289.0707
3.6
245, 203
281
(8)
13.9
5-p-Coumaroylquinic acid
C16H17O8
337.0915
5.1
191
(9)
18.0
Quercetin-3-O-
C27H29O16
609.1433
2.8
301
(10)
18.4
Quercetin-3-O-
C21H19O12
463.0837
7.7
301
354
(11)
20.2
Kaempferol hexoside
C21H19O11
447.0942
−2.0
284, 255
357
(12)
21.0
Kaempferol rutinoside
C27H29O15
593.1561
−7,3
284
(13)
23.7
C15H9O7
301.0360
−2.2
179, 151
370
RT, retention time; [M−H]−(m/z), negatively charged molecular ion; MS2(m/z), daughter ions produced from [M−H]− fragmentation; , maximum absorbance for compound identification by UV-vis spectra; sh, shoulder. identified using corresponding standards. Other compounds are tentatively proposed on the basis of RT, accurate MS, and MS/MS according to data from the literature.
