Concentrations of
grapefruit (cv. 鈥楻io Red鈥?
Citrus paradisi Macf.) bioactives
grown under or
ganic and conventional production systems were evaluated after stora
ge at various temperatures. The first experiment was conducted in November 2008 and the second experiment was conducted in February 2011 usin
g commercial production, processin
g, and packin
g procedures. The harvested
grapefruits were stored at 23 掳C (room temperature) or 9 掳C for 4 weeks and analyzed for vitamin C, limonoids, and carotenoids at the end of each week usin
g HPLC. Vitamin C levels were hi
gher in or
ganically
grown
grapefruits (41.8 m
g/100
g) compared to conventionally
grown
grapefruits (39.2 m
g/100
g) at 0 days after harvest in the first experiment. However, production system did not si
gnificantly affect vitamin C levels in the second experiment. Durin
g stora
ge at room temperature, vitamin C de
gradation losses ran
ged from 0.5 to 7% for or
ganically produced
grapefruits and from 3 to 18% for conventional
grapefruits in both experiments. In the first experiment at harvest, or
ganically produced
grapefruits had 77% hi
gher (
p 鈮?0.05) nomilin than conventionally produced
grapefruits, whereas
grapefruits
grown under the conventional production system had 2-fold hi
gher lycopene levels compared to or
ganic
grapefruits. In the second experiment, both 尾-carotene and lycopene levels were si
gnificantly (
p 鈮?0.05) hi
gher in conventionally produced
grapefruits than in or
ganic
grapefruits. Overall, conventional production si
gnificantly increased
grapefruit carotenoid levels in both experiments. In
general, stora
ge temperature (room temperature and 9 掳C) had minimal effects on vitamin C de
gradation but si
gnificant effects on the de
gradation of carotenoids in the first experiment.
Keywords:
g/action/doSearch?action=search&searchText=grapefruit&qsSearchArea=searchText">grapefruit; g/action/doSearch?action=search&searchText=organic&qsSearchArea=searchText">organic; g/action/doSearch?action=search&searchText=conventional&qsSearchArea=searchText">conventional; g/action/doSearch?action=search&searchText=bioactives&qsSearchArea=searchText">bioactives; g/action/doSearch?action=search&searchText=HPLC&qsSearchArea=searchText">HPLC