PEG-35 Castor Oil

Functions
Detergent
Emulsifier
Solubilizer
CAS Number(s)
61791-12-6
FDA UNII
6D4M1DAL6O

PEG-35 Castor Oil (Polyoxyethylenglyceroltriricinoleat 35) is a non-ionic solubilizer and emulsifier obtained by causing ethylene oxide to react with castor oil; quality in a molar ratio of 35 moles to 1 mole. It is an emulsifying agent for the pharmaceuticals, cosmetics, and feedstuffs industries. It is used in aqueous preparations of hydrophobic substances, e.g., fat-soluble vitamins and essential oils.

The main component of PEG-35 Castor Oil is glycerol-polyethylene glycol ricinoleate, which, together with fatty acid esters of polyethyleneglycol, represents the ingredient's hydrophobic part. The smaller, hydrophilic part consists of polyethylene glycols and ethoxylated glycerol.

PEG-35 Castor Oil is a pale yellow, oily liquid clear above 26 °C. It has a slight but characteristic odor and can be entirely liquefied by heating to 26 °C. The hydrophilic-lipophilic balance (HLB) lies between 12 and 14.

PEG-35 Castor Oil is used as a solubilizer and emulsifier in many different industries. It is particularly suitable for the production of liquid preparations. The degree to which the hydrophobic substance is distributed in the liquid depends mainly on its properties and the amount of PEG-35 Castor Oil used.

In the cosmetics industry, PEG-35 Castor Oil is used preferentially for solubilizing perfume oils and emulsifying fatty substances, organic solvents, and additives. It is an outstanding solubilizer for aroma chemicals and ethereal oils in aqueous isopropyl or ethyl alcohol, provided that the alcohol concentration is 30 – 50 %. In many cases, minimal additions of PEG-35 Castor Oil are adequate under these conditions so that the product's inherent odor is completely masked.

Synonyms
Polyoxyl 35 Castor Oil
Cremophor® EL

Solubility

PEG-35 Castor Oil forms clear solutions in water. It is also soluble in ethyl alcohol, n-propyl alcohol, isopropyl alcohol, ethyl acetate, chloroform, carbon tetrachloride, trichloroethylene, toluene, and xylene. In contrast to that of anionic emulsifying agents, the solubility in water decreases with rising temperature.

Thus, aqueous solutions become turbid at a specific temperature. PEG-35 Castor Oil is miscible with all other Cremophor grades and, on heating, with fatty acids, fatty alcohols, and particular animal and vegetable oils. It is thus miscible with oleic and stearic acids, dodecyl and octadecyl alcohols, castor oil, and several lipid-soluble substances.

Stability

PEG-35 Castor Oil in aqueous solutions is stable towards electrolytes, e.g., acids and salts, provided their concentration is not too high. Some organic substances may cause precipitation at specific concentrations, especially compounds containing phenolic hydroxyl groups, e.g., phenol, resorcinol, and tannin.

PEG-35 Castor Oil can be sterilized by heating in an autoclave for 30 minutes at 120 °C. Thus, it may acquire a deeper shade. During sterilization, it should not be heated with strongly acidic or alkaline substances, which would saponify it.

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