Liquid chromatographic determination of naringin and neohesperidin as a detector of grapefruit juice in orange juice
Rouseff, R.L.
Journal - Association of Official Analytical Chemists 71(4): 798-802
1988
ISSN/ISBN: 0004-5756 PMID: 3417605 Document Number: 325507
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 (Citrus grandis) and from 1.3 to 2.5 in sour orange (Citrus aurantium) cultivars; the ratio is always < 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 alinera 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%.