Preferencje help
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 5

Liczba wyników na stronie
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 1 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników

Wyniki wyszukiwania

help Sortuj według:

help Ogranicz wyniki do:
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 1 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
Phenolic compounds form one of the main classes of secondary metabolites. They display a large range of structures and are responsible for the major organoleptic characteristics of plant-derived foods and beverages, particularly color and taste properties. They also contribute to the nutritional qualities of fruits and vegetables. Among these compounds, flavonoids constitute one of the most prevailing groups among plant phenolics. Owing to their importance in food organoleptic properties and human health, a better understanding of their structures and biological activities indicates their potentials as therapeutic agents and also for predicting and controlling food quality. Due to the variety of pharmacological activities in the mammalian body, flavonoids are more correctly referred as “nutraceuticals”.
The effect of harvest time, blanchnig, freezing and long term storage of fro-zen broccoli on flavonoids content in broccoli florets was studied. Two broccoli cultivars Naxos F1 and Chronos F1 grown conventionally were used in the exper-iments. The small broccoli florets of 2 cm diameter were blanched in water of temperature 96-98 °C for 2,5 minutes, cooled in cold water and next packaged into nonperforated PE bags of 250 g capacity. Samples of broccoli were frozen at temperature -25 °C and next stored for 9 months in cold room at temperature -25 °C. Before flavonoid analysis of fresh and frozen broccoli were lyophilized and homogenized to receive a homogenous material. Analyses of flavonoids were performed for fresh broccoli, blanched and frozen material, as well as after 9 months of storage at -25 °C. Quercetin and kaempferol were found in fresh broccoli florets after harvest of both cultivars Naxos F1 and Chronos F1. Total flavonoids content in fresh broccoli ranged between 205,0 mg·kg-1 d.m. and 406,6 mg·kg-1 d.m. After blanching quercetin content in broccoli has decreased by 46-91% and kaempferol by 58-75%. After storage of frozen broccoli for 9 months there was found 8,0-17,1 mg·kg-1 d.m. of quercetin and 42,0-188,3 mg·kg-1 d.m. of kaempferol.
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 1 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.