Sweet Orange Aroma

#### Orange Aroma, Sweet. From selected qualities of sweet orange oil (selected for flavor use), the flavor houses will often make their own "aromas" or aroma- concentrates. A general procedure for the manufacture of citrus oil aromas, aroma-distillates and glycol aromas is outlined in Part One of this book. The "washing" of sweet orange oil with diluted ethyl alcohol yields the so-called orange-aromas; these can be considered as solutions of terpeneless and sesquiterpeneless orange oil in diluted alcohol. A by-product of this process is the so-called "**Washed**** ****Orange**** ****Oil**" which is a commercial item of some value in industrial perfumery, etc. A "washed orange oil" is not entirely stripped of its oxygenated components (aldehydes, etc. . and it still has the waxes and sesquiterpenes which give good fixative effect. Washed citrus oils should be properly dried and kept cool and dark They tend to become rancid after the shortest exposure to daylight, particularly if moisture is present. The use of antioxidants offers great advantages in this case. **Orange**** ****Glycol**** **is produced by liquid-liquid extraction of sweet orange oil with propylene glycol which is subsequently diluted with 15 to 25% of distilled water. The diluted glycol will then contain a terpeneless and sesquiterpeneless sweet orange oil, although the extraction is far from perfect. The glycol-aroma is filtered after standing and chilling, and it now serves as a base for orange flavors for carbonated drinks and other aqueous products to be flavored with a mild, true-to-nature orange: liqueurs, pharmaceutical preparations, etc. This type of orange aroma offers the advantage of excellent solubility in aqueous media. The average use level of these aromas is about 20.0 to 60.0 mg%. These figures apply to the use in slightly acid media for straight orange flavors. Much lower concentrations can be used with advantage where the orange flavor is a modifier (e.g. ginger ale. etc.). The terpenes which are separated from the glycol-washing of the sweet orange oil are dried and used as "washed orange oil". The term "**Citrus Oil" **is commercially applied to a mixture of distilled or washed oils from grapefruit, sweet orange, lemon, and occasionally other citrus oils. Lemon terpenes are often kept separately since they command a higher price. They find use in the "scientific" adulteration of lemon oil on account of the lower optical rotation of lemon terpenes than that of orange and grapefruit terpenes. The **Citrus Oil **(so-called, commercially) is obtained either by distillation of crushed peels, by evaporation of juice, or by the production of the above types of aroma (washed citrus oil). **Citrus Oil **is a pale yellowish mobile liquid of sweet and comparatively fresh odor, revealing its orange and grapefruit components with a predominant. note of monoterpenes. This product also becomes rancid easily. It is used in industrial perfumes, low-cost detergents, etc.