Pak choi (Brassica rapa ssp. Chinensis) glucosinolates profile and bioaccessibility through in vitro dynamic digestion model

Fresh pak choi glucosinolates profile and bioaccessibility was analysed trough an in vitro dynamic digestion model. Fresh pak choi showed an original glucosinolate content of 17.83 ± 0.39 mg/100 g. A higher contribution to total glucosinolate content in the whole fresh plant was observed for the stem fraction because of a higher representation in the total weight of the sample. Glucobrasicanapin (4.965 ± 1.195 mg/100 g) and gluconapin (4.618 ± 1.401 mg/100 g) were found as the principal compounds in the sample, but 4-methoxyglucobrassicin, glucoalysin and glucobrassicin were also determined. After the digestion simulation the glucosinolates bioaccessibility was determined as 54.8%. Aliphatic glucosinolates were the main remained compounds in the bioaccesible fraction of the fresh pak choi sample. The most abundant compounds were glucbrasicanapin (4.380 ± 2.061 mg/100 g), gluconapin (2.284 ± 0.177 mg/100 g) and 4-methoxyglucobrassicin (1.438 ± 0.408 mg/100 g). Hence, pak choi was highlighted as an excellent food source of intact bioaccessible glucosinolates, mainly as aliphatic compounds.