Table Info

Table 2.

Polyphenols identified by photo diode array-HPLC (PDA-HPLC) in 20 apple varieties

Number	t_R (min)	Polyphenol compound	Formula
P1	11.17	Neochlorogenic acid	C₁₆H₁₈O₉
P2	14.77	Catechin	C₁₅H₁₄O₆
P3	17.25	Chlorogenic acid	C₁₆H₁₈O₉
P4	20.25	p-Coumaroylquinic acid	C₁₆H₁₈O₈
P5	20.94	Caffeic acid	C₉H₈O₄
P6	22.79	Epicatechin	C₁₅H₁₄O₆
P7	23.30	Caffeoylquinic acid isomer	C₁₆H₁₈O₉
P8	24.32	Kaempferol-hexoside	C₂₇H₃₀O₁₅
P9	29.95	Coumaric acid	C₉H₆O₃
P10	30.89	Ferulic acid	C₁₀H₁₀O₄
P11	37.50	Protocatechuic acid	C₇H₆O₄
P12	38.29	Quercetin 3,5-digalactoside	C₂₇H₃₀O₁₇
P13	38.77	Rutin	C₂₇H₃₀O₁₆
P14	39.63	Caffeoyl hexoside	C₁₅H₁₈O₉
P15	40.68	Phlorizin	C₂₁H₂₄O₁₀
P16	41.42	Syringic acid	C₉H₁₀O₅
P17	41.94	Naringenin-7-hesperidoside	C₂₇H₃₂O₁₄
P18	42.82	Procyanidin A-type trimer	C₄₅H₃₆O₁₈
P19	43.53	Procyanidin B-type trimer	C₄₅H₃₆O₁₈
P20	45.08	Quercetin rutinoside	C₂₇H₃₀O₁₆
P21	45.40	Quercetin-3-O-deoxyhexosyl(1-2) deoxyhexoside	C₂₇H₃₀O₁₅
P22	45.58	Quercetin-3-O-pentosyl-7-O-hexoside	C₂₆H₂₈O₁₆
P23	45.80	Phloretin	C₁₅H₁₄O₅
P24	46.21	3-Hydroxyphloretin	C₁₅H₁₄O₆
P25	46.48	Phloretin 2’-O-rhamnoside	C₂₁H₂₄O₉
P26	46.76	Shikimic acid	C₇H₁₀O₅
P27	47.11	Quercetin-3-O-pentosyl-pentoside	C₂₅H₂₆O₁₅
P28	47.81	Procyanidin B-type dimer	C₃₀H₂₆O₁₂
P29	48.14	Procyanidin A-type dimer	C₃₀H₂₄O₁₂
P30	48.43	3-Hydroxyphloretin-pentosyhexoside	C₂₁H₂₄O₁₁
P31	49.04	Quercetin 3-O-(6’’-acetyl-glucoside)	C₂₃H₂₂O₁₃

t_R: retention time

Declarations

Author contributions

WW and XL equally contributed to: Conceptualization, Investigation, Writing—original draft, Writing—review & editing. JH: Conceptualization, Investigation, Writing—original draft. JB: Validation, Writing—review & editing, Supervision. All authors read and approved the submitted version.

Conflicts of interest

The authors declare that they have no conflicts of interest.

Ethical approval

Not applicable.

Consent to participate

Not applicable.

Consent to publication

Not applicable.

Availability of data and materials

Not applicable.

Funding

This work was funded by the earmarked fund for China Agriculture Research System [CARS-27]. The funders had no role in study design, data collection and analysis, or preparation of the manuscript.

Copyright

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