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Flavones are abundant in parsley and celery and possess unique anti-inflammatory properties in vitro and in animal models. However, their bioavailability and bioactivity depend in part on the conjugation of sugars and other functional groups to the flavone core. The effects of juice extraction, acidification, thermal processing, and endogenous enzymes on flavone glycoside profile and concentration in both parsley and celery were investigated. Parsley yielded 72% juice with 64% of the total flavones extracted, whereas celery yielded 79% juice with 56% of flavones extracted. Fresh parsley juice averaged 281 mg flavones/100 g and fresh celery juice, 28.5 mg/100 g. Flavones in steamed parsley and celery were predominantly malonyl apiosylglucoside conjugates, whereas those in fresh samples were primarily apiosylglucoside conjugates; this was apparently the result of endogenous malonyl esterases. Acidification and thermal processing of celery converted flavone apiosylglucosides to flavone glucosides, which may affect the intestinal absorption and metabolism of these compounds.

journal of agricultural and food chemistry

Endogenous Enzymes, Heat, and pH Affect Flavone Profiles in Parsley (Petroselinum crispum var. <i>neapolitanum</i>) and Celery (Apium graveolens) during Juice Processing

Endogenous Enzymes, Heat, and pH Affect Flavone Profiles in Parsley (Petroselinum crispum var. neapolitanum) and Celery (Apium graveolens) during Juice Processing