Cold-pressed orange oil

Worldwide production of cold-pressed orange oil is nearly 20000t/yr. Its main uses are the flavoring of beverages and confectioneries and perfuming eau de cologne, soaps and household products. FCT 1974 (12) 733 [8008-57-9], [8028-48-6],... 

Cold pressed orange oil contains over 95 by weight monoterpene hydrocarbons. The principal constituent, d-limonene, ranges from 83-97 percent (9), Limonene degradation has been well docu-meted in the literature (LO, 1 1). Anandaraman identified limonene-1,2-epoxide and carvone as two of the earliest degradation products of d-limonene (12, 13). 

Little work has been published comparing the shelf life of flavors encapsulated by different processes. The purpose of this investigation was to determine the shelf life of cold pressed orange oil encapsulated by spray drying, extrusion, and molecular inclusion. Limonene-1,2-epoxide concentration was used to monitor oxidation. 

The gas chromatograms of fresh and oxidized cold pressed orange oil are presented in Figure 2. The compound, 2-octanone, was used as the internal standard. 

Figure G1.5.7 Typical gas chromatogram for cold-pressed orange oil. Reproduced with permission from Agilent Technologies, Inc. (see Internet Resources).

Shaw, P. E. Coleman, R. L. Quantitative composition of cold-pressed orange oils. J. Agric. Food Chem., 1974, 22, 785-787. 

Adsortpion and desorption behavior of cold-pressed orange oil were measured at 313 K by using the column with 10 mm i.d. x 500 mm in length. The feed dissolved in SC-C02 was continuously passed through the column packed with silica gel at 8.8 MPa for adsorption step, and then, after the equilibrium, pure SC-C02 was passed through... 

A high-pressure circulation-type apparatus was designed and constructed to investigate the vapor-liquid equilibria (VLE) of systems containing limonene, linalool and supercritical carbon dioxide. VLE data of binary and ternary systems of these compounds can be determined in the ranges of pressure and temperature of interest for the deterpenation of cold-pressed orange oil. The preliminary results obtained for the binaries CC -linalool and C02-limonene were compared to data already published with acceptable accuracy and well correlated by a modified Soave-Redlich-Kwong (SRK) equation of state. 

A common practice to study each citrus oil is to consider it as a binary synthetic mixture of its two more important components [4, 5, 6, 7]. For instance, the cold-pressed orange oil is usually treated as a mixture of limonene and linalool, representing the terpene and the oxygenated fractions, respectively. 

Physicochemical Properties of Cold-Pressed Orange Oil (var. Comuna) at Different Harvesting Times... 

Properties of Cold-Pressed Orange Oil Produced by Various Methods (FMC In-line and Brown Shaver)... 

Supercritical fluid extraction is also a suitable technique for enhancing the quality of essential oils obtained by conventional extraction methods, by means of fractionation and deterpenation. Thus, the separation of citrus oils into different clssses of substances by supercritical CO2 has been widely investigated. Temelli et al. reported a method for the extraction of terpene hydrocarbons from cold-pressed Valencia orange oil with supercritical CO2, using both static and dynamic flow approaches (65). Another article has reported the SFE of terpenes from cold-pressed orange oil in a temperature range from 40°C to 70°C and pressures from 83 to 124 bar (66). The determination and elimination of psoralens from lemon peel oil by SFE has also been conducted (67). The procedure included the increase of CO2 density in successive steps. 

However, it has been estimated that actual cold-pressed orange oil production is only about 20% of the potential with another 25-30% recovered as d-limonene ( ). 

Cold Pressed Orange Oil, Cold Pressed Orange Oil, Brazilian. See Orange (Citrus aurantium dulcis) oil... 

Coriander (Coriandrum sativum) oil 8008-53-5 Ethiodized oil lodorga Phyt iod 8008-56-8 Citreatt Lemon 3123 Citreatt Lemon 6122 Lemon (Citrus medica limonum) oil 8008-57-9 Citreatt Orange 3111 Citreatt Orange 6110 Cold Pressed Orange Oil Cold Pressed Orange Oil, Brazilian EmCon Orange... 

TABLE 8.7 Percentage of Component in Cold-pressed Orange Oil Sorbed by Different Plastics it was in Contact with for a 4-day Period... 

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