Volatile flavour components of grapefruit juice (Citrus paradisi Macfadyen)

1985 ◽  
Vol 36 (8) ◽  
pp. 757-763 ◽  
Author(s):  
Alberto J. Núnez ◽  
Henk Maarse ◽  
Jo M. H. Bemelmans
Keyword(s):  
Grapefruit Juice ◽  
Citrus Paradisi ◽  
Volatile Flavour

Furocoumarin Kinetics in Plasma and Urine of Healthy Adults Following Consumption of Grapefruit (Citrus paradisi Macf.) and Grapefruit Juice

2017 ◽  
Vol 65 (14) ◽  
pp. 3006-3012 ◽  
Author(s):  
Melissa M. Melough ◽  
Terrence M. Vance ◽  
Sang Gil Lee ◽  
Anthony A. Provatas ◽  
Christopher Perkins ◽  
...  
Keyword(s):  
Grapefruit Juice ◽  
Healthy Adults ◽  
Citrus Paradisi

scholarly journals Evaluation of Grapefruit Juice (Citrus paradisi) as an Alternative Disinfectant for Hatching Eggs

2018 ◽  
Vol 50 (2) ◽  
Author(s):  
Justyna Batkowska ◽  
Lukasz Wlazlo ◽  
Kamil Drabik ◽  
Bozena Nowakowicz- Debek ◽  
Karrar I.A. Al-Shammari ◽  
...  
Keyword(s):  
Grapefruit Juice ◽  
Citrus Paradisi ◽  
Hatching Eggs

scholarly journals Respiratory Rates and Glycosidase Activities of Juice Vesicles Associated with Section-drying in Citrus

HortScience ◽  
1990 ◽  
Vol 25 (5) ◽  
pp. 544-546 ◽  
Author(s):  
Jacqueline K. Burns
Keyword(s):  
Oxygen Uptake ◽  
Grapefruit Juice ◽  
Citrus Fruit ◽  
Citrus Paradisi ◽  
Cell Wall Synthesis ◽  
Fresh Weight ◽  
Salicylhydroxamic Acid ◽  
Support Cell ◽  
Grape Fruit ◽  
Citrus Reticulate

Oxygen uptake and glycosidase activities were examined in normal and granulated juice vesicles of several citrus fruit. Oxygen uptake was low in normal juice vesicles isolated from freshly harvested `Lee' tangelos [Citrus reticulate Blanco cv. Clementine × (Citrus paradisi Macf. cv. Duncan × Citrus reticulate Blanco cv. Dancy)] and stored `Dancy' tangerine (C. reticulate Blanco) and `Marsh' grapefruit (Citrus paradisi Macf.) (35.7, 17.9, and 11.6 μl O2/hr per g fresh weight, respectively), but was 2- to 3-fold higher in granulated juice vesicles. As severity of granulation increased in grape. fruit, O2 uptake increased. Oxygen uptake in normal and disordered juice vesicles of all citrus fruit examined was reduced to nondetectable levels with 0.1 mM KCN and was insensitive to salicylhydroxamic acid. α - and β -galactosidase and α- and β -glucosidase activities were present in extracts of normal grapefruit juice vesicles (123, 214, 51, and 25 nmol·hr-1·g-1 fresh weight, respectively) and was 2- to 3-fold higher in extracts of granulated tissue. α- and β -mannosidase activities, nondetectable in normal juice vesicle extracts, were present in extracts from granulated tissue. The results suggest that increased metabolic activity occurs in granulated juice vesicles and the energy produced may be used to support cell wall synthesis and modification. Increases in O2 uptake and glycosidase activities correlate well with observed symptoms of section-drying in citrus.

scholarly journals Grapefruit-Drug Interaction: Levels of Furocoumarin in Different Varieties

HortScience ◽  
2004 ◽  
Vol 39 (4) ◽  
pp. 863E-864
Author(s):  
Basavaraj Girennavar* ◽  
Narayan Bhat ◽  
Jennifer Brodbelt ◽  
Michael Pikulski ◽  
G.K. Jayaprakasha ◽  
...  
Keyword(s):  
High Performance Liquid Chromatography ◽  
Liquid Chromatography ◽  
Drug Interaction ◽  
Mobile Phase ◽  
High Performance ◽  
Grapefruit Juice ◽  
Gradient Elution ◽  
Citrus Paradisi ◽  
Low Concentrations ◽  
Dried Extract

Grapefruit juice contain furanocoumarin derivatives which are known to interact with various drugs such as felodipine, leading to the increased bioavailability. Due to very low concentrations of furocoumarin in grapefruit juice, isolation of these compounds has been a challenge to researchers. Five grapefruit (Citrus paradisi Macf.) varieties such as `Marsh White', `Duncan', `Rio Red', `Orange Flesh', and `Mexican Red' were harvested and analyzed. Samples were extracted successively three times with ethyl acetate until all furocoumarins were extracted. The dried extract was reconstituted in methanol and used for quantification using high-performance liquid chromatography. Furanocoumarins were quantified by gradient elution with methanol and water as mobile phase with a flow rate of 1.1 mL/min at 240 nm. The concentrations of bergamottin, dihydroxybergamotin (DHB) and dimer of DHB were shown to distinctly differ among varieties. Red colored grapefruit showed lower concentrations of the furocoumarins compared to white colored grapefruit. Among the five varieties, `Rio Red' grapefruit contain lower concentrations of bergamottin and DHB. Further studies are continued to quantify other dimers and commercial varieties. Knowledge of furocoumarin levels in grapefruit may eventually help the consumer to make decision about eating grapefruit and/or drinking juice while taking certain medications.

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