Liquid chromatographic determination of naringin and neohesperidin as a detector of grapefruit juice in orange juice.
Naringin/neohesperidin ratios can be used to differentiate orange juice which may contain added grapefruit juice from orange juice which may include juices from other naringin-containing cultivars. The naringin/neohesperidin ratios in juice vary from 14 to 83 in grapefruit (C. grandis) and from 1.3 to 2.5 in sour orange (C. aurantium) cultivars; the ratio is always less than 1 for the K-Early tangelo. Concentrations of both naringin and neohesperidin can be determined in orange juice by using a single liquid chromatographic isocratic reverse-phase system with a C-18 column. The detection limit for both compounds is 1 ppm with a linear working range to 500 ppm. Concentration relative standard deviations range from 0.47 to 1.06% for naringin and from 0.4 to 1.27% for neohesperidin. Naringin and neohesperidin recoveries ranged from 93 to 102% at concentrations of 5 and 50 ppm. Naringin values from blind duplicate samples of orange/grapefruit juice blends could be duplicated to +/- 3%.
Rouseff
R L
RL
University of Florida, Institute of Food and Agriculture Sciences, Lake Alfred 33850.
D001628:Beverages / Q000032:analysis*; D002599:Chalcone / Q000031:analogs & derivatives / Q000032:analysis*; D047188:Chalcones; D002853:Chromatography, Liquid; D002957:Citrus / Q000032:analysis*; D044950:Flavanones; D005419:Flavonoids / Q000032:analysis*; D006569:Hesperidin / Q000031:analogs & derivatives / Q000032:analysis*; D007202:Indicators and Reagents; D011427:Propiophenones / Q000032:analysis*; D013056:Spectrophotometry, Ultraviolet
D047188:Chalcones; D044950:Flavanones; D005419:Flavonoids; D007202:Indicators and Reagents; D011427:Propiophenones; C013613:neohesperidin dihydrochalcone; D002599:Chalcone; D006569:Hesperidin; C005273:naringenin