The aim of this work was to evaluate the level of total glucosinolates (GLS) in fresh kale leaves and leaves
after processing (blanching, cooking), as well as in frozen, canned and dried products after 1-year
storage. Fresh kale leaves contained 26.87 mmol GLS per 1 g dry weight, of which aliphatic GLS
comprised 63%. GLS levels in kale leaves were affected by blanching and cooking; losses were highest in
leaves preserved by sterilization and lowest in frozen leaves. After 12 months of storage, mean amounts
of total GLS in frozen and canned products were 15.59 mmol and 10.73 mmol respectively per 1 g. In dried
products, mean total GLS levels ranged from 9.09 to 13.81 mmol, being significantly (on average 13%)
higher in freeze-dried products than in those dried by hot air. Moreover, dried products obtained from
blanched leaves showed higher mean amounts of total GLS than those obtained from unblanched leaves.
Frozen products from blanched material contained the highest amounts of GLS; total GLS were average
20% higher than in frozen products obtained from cooked raw material, 58%, higher than in canned
products, and 47% higher than in dried products. Aliphatic glucosinolates were usually more stable than
indole GLSs.
The aim of this work was to evaluate the level of total glucosinolates (GLS) in fresh kale leaves and leaves
after processing (blanching, cooking), as well as in frozen, canned and dried products after 1-year
storage. Fresh kale leaves contained 26.87 mmol GLS per 1 g dry weight, of which aliphatic GLS
comprised 63%. GLS levels in kale leaves were affected by blanching and cooking; losses were highest in
leaves preserved by sterilization and lowest in frozen leaves. After 12 months of storage, mean amounts
of total GLS in frozen and canned products were 15.59 mmol and 10.73 mmol respectively per 1 g. In dried
products, mean total GLS levels ranged from 9.09 to 13.81 mmol, being significantly (on average 13%)
higher in freeze-dried products than in those dried by hot air. Moreover, dried products obtained from
blanched leaves showed higher mean amounts of total GLS than those obtained from unblanched leaves.
Frozen products from blanched material contained the highest amounts of GLS; total GLS were average
20% higher than in frozen products obtained from cooked raw material, 58%, higher than in canned
products, and 47% higher than in dried products. Aliphatic glucosinolates were usually more stable than
indole GLSs.
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