Grapefruit albedo

Extractor designs that minimize squeeze pressure and juice contact time with the albedo will produce grapefruit juices with... 

Orange, grapefruit, lemon Naringenin, hesperetin Peeling, separation for juice and albedo, air-dried, derivatization ID-BPX5 He GC/MS/ ion trap detector 36... 

Most of the bitter glucosides are in the albedo and segment membranes so that commercial production of grapefruit juice without removal of naringin is possible. Production of juice from natsudaidai oranges 180) and restoration of the pink color to pink grapefruit juice by addition of pulp 181) require debittering. 

Fluid loss from dry-pack segments was found to be correlated with loss of membrane strength. In stored, dry-pack unpasteurized grapefruit segments, naringin crystals formed in albedo cells still adhering to section membranes after treatment. Crystal formation was minimized by water sprays or lye solution dips. This process provides a new approach for commercial sectioning of citrus. 

An alternate technology with the potential to minimize labor input and increase product yield was described by Bruemmer et al. (1,2). Vacuum infusion was utilized to permeate the albedo of grapefruit with any of several commercial pectinases. 

In view of the fact that pectin lowers serum cholesterol levels and cholesterol Is carried by lipoproteins In the serum, we investigated the Interaction of pectin obtained from grapefruit albedo with various human serum lipoprotein fractions in vitro (22). It was observed that pectin Interacted specifically with LDL, while no Interaction was observed between pectin and high density or very low density lipoproteins. The biological significance of this observed in vitro Interaction of pectin with LDL remain unclear, primarily because of lack of evidence suggesting entry of pectin or some component of It into the blood streatm. Therefore, unless such entry and/or absorption of pectin or one of Its components is demonstrated, the biological Implication of this observed Interaction... 

Cltnis oHs. Essential oil obtained from the peel of citrus fruits (bergamot, grapefruit, lime, mandarin, orange, lemon). Since the oil is stored in small bubbles in the outer peel (albedo) it can be isolated by mechanical processes. C. are thus known as pressed or cold-pressed oils. 

In all the citras fruits, the essential oil is contained in numerous oval, balloon-shaped oil sacs or glands situated irregularly just below the surface of the colored portion of the peel (the flavedo). The white inner mesocarp (the albedo) does not contain any oil sacs but does carry the bitter glycosides such as hesperidin in lemon, orange, and tangerine, or naringin in grapefruit. 

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