Kohlrabi (Brassica oleracea L. var. gongylodes) is a native plant from NorthernEurope. In the present work, we show a survey on five kohlrabi genotypes (CR13,CR17, CR22, CR25 and CR29) cultivated in Southern Italy. We measured the contentof glucosinolates (GLS), total phenols (PC), ascorbic acid (AsA), total anthocyanins(ATH), total carotenoids (CAR) and the antiradical activity on different parts of theplant (skins, stems and leaves). Four GLS were identified in the leaves, i.e., glucoraphanin,glucobrassicin, gluconasturtiin and neo-glucobrassicin. The GLS profile ofthe stems and leaves were similar. However, stems showed a lower GLS amount andthe presence of glucoerucin. The total polyphenols and AsA content was slightly higherin the leaves than in the stems. With regards to ATH, higher values were found in theleaves with respect to the skins, with the exception of CR17. The values of antiradicalactivity differed depending on the method of measurement. The leaves generallyshowed higher antiradical activity in terms of DPPH quenching compared to skinsand stems, with the exception of CR22 that was highest in stems. On the other hand,leaves and skins had a similar peroxyl radical (ROO.) scavenging capacity,presumably influenced by the presence of anthocyanins, as suggested by the high correlationbetween ROO. scavenging capacity and ATH content (r=0.81). As expected, asignificant correlation was found between DPPH quenching and AsA content, andbetween ROO. and CAR. Interestingly, an unexpected correlation was found betweenGLS and DPPH determinations, suggesting a possible involvement of GER in the totalantiradical activity.

Phytochemical Profile of Kolhrabi (Brassica oleracea L. var. gongylodes) Cultivated in Italy

BRANCA, Ferdinando;
2013-01-01

Abstract

Kohlrabi (Brassica oleracea L. var. gongylodes) is a native plant from NorthernEurope. In the present work, we show a survey on five kohlrabi genotypes (CR13,CR17, CR22, CR25 and CR29) cultivated in Southern Italy. We measured the contentof glucosinolates (GLS), total phenols (PC), ascorbic acid (AsA), total anthocyanins(ATH), total carotenoids (CAR) and the antiradical activity on different parts of theplant (skins, stems and leaves). Four GLS were identified in the leaves, i.e., glucoraphanin,glucobrassicin, gluconasturtiin and neo-glucobrassicin. The GLS profile ofthe stems and leaves were similar. However, stems showed a lower GLS amount andthe presence of glucoerucin. The total polyphenols and AsA content was slightly higherin the leaves than in the stems. With regards to ATH, higher values were found in theleaves with respect to the skins, with the exception of CR17. The values of antiradicalactivity differed depending on the method of measurement. The leaves generallyshowed higher antiradical activity in terms of DPPH quenching compared to skinsand stems, with the exception of CR22 that was highest in stems. On the other hand,leaves and skins had a similar peroxyl radical (ROO.) scavenging capacity,presumably influenced by the presence of anthocyanins, as suggested by the high correlationbetween ROO. scavenging capacity and ATH content (r=0.81). As expected, asignificant correlation was found between DPPH quenching and AsA content, andbetween ROO. and CAR. Interestingly, an unexpected correlation was found betweenGLS and DPPH determinations, suggesting a possible involvement of GER in the totalantiradical activity.
2013
Brassicaceae; glucosinolates; antioxidant capacity
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11769/35448
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