The Production of Volatile Oils and Perfumery Plants in the United States
By Frank Rabak
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The Production of Volatile Oils and Perfumery Plants in the United States - Frank Rabak
U. S. DEPARTMENT OF AGRICULTURE.
BUREAU OF PLANT INDUSTRY—BULLETIN NO. 195.
B. T. GALLOWAY, Chief of Bureau.
THE PRODUCTION OF VOLATILE OILS AND PERFUMERY PLANTS IN THE UNITED STATES.
BY
FRANK RABAK,
CHEMICAL BIOLOGIST, DRUG-PLANT, POISONOUS-PLANT, PHYSIOLOGICAL, AND FERMENTATION INVESTIGATIONS.
Copyright © 2013 Read Books Ltd.
This book is copyright and may not be reproduced or copied in any way without the express permission of the publisher in writing
British Library Cataloguing-in-Publication Data
A catalogue record for this book is available from the British Library
Essential Oils
Essential oils are also known as volatile oils, ethereal oils, aetherolea, or simply as the 'oil of' the plant from which they are extracted, such as the oil of clove. An oil is 'essential' in the sense that it contains the characteristic fragrance of the plant that it is taken from. Essential oils do not form a distinctive category for any medicinal, pharmacological, or culinary purpose - and they are not essential for health, although they have been used medicinally in history. Although some are suspicious or dismissive towards the use of essential oils in healthcare or pharmacology, essential oils retain considerable popular use, partly in fringe medicine and partly in popular remedies. Therefore it is difficult to obtain reliable references concerning their pharmacological merits.
Medicinal applications proposed by those who sell or use medical oils range from skin treatments to remedies from cancer - and are generally based on historical efficacy. Having said this, some essential oils such as those of juniper and agathosma are valued for their diuretic effects. Other oils, such as clove oil or eugenol were popular for many hundreds of years in dentistry and as antiseptics and local anaesthetics. However as the use of essential oils has declined in evidence based medicine, older text-books are frequently our only sources for information! Modern works are less inclined to generalise; rather than referring to 'essential oils' as a class at all, they prefer to discuss specific compounds, such as methyl salicylate, rather than 'oil of wintergreen.'
Nevertheless, interest in essential oils has considerably revived in recent decades, with the popularity of aromatherapy, alternative health stores and massage. Generally, the oils are volatized or diluted with a carrier oil to be used in massage, or diffused in the air by a nebulizer, heated over a candle flame, or burned as incense. Their usage goes way back, and the earliest recorded mention of such methods used to produce essential oils was made by Ibn al-Baitar (1188-1248), an Andalusian physician, pharmacist and chemist. Different oils were claimed to have differing properties; some to have an uplifting and energizing effect on the mind such as grapefruit and jasmine, whilst others such as rose lavender have a reputation as de-stressing and relaxing - and also, usefully, as an insect repellent.
The oils themselves are usually extracted by 'distillation', often by using steam -but some other processes include 'expression' or 'solvent extraction'. Distillation involves raw plant material (be that flowers, leaves, wood, bark, roots, seeds or peel) put into an alembic (distillation apparatus) over water. As the water is heated, the steam passes through the plant material, vaporizing the volatile compounds. The vapours flow through a coil, where they condense back to liquid, which is then collected in the receiving vessel. 'Expression' differs in that it usually merely uses a mechanical or cold press to extract the oil. Most citrus peel oils are made in this way, and due to the relatively large quantities of oil in citrus peel and low cost to grow and harvest the raw materials, citrus-fruit oils are cheaper than most other essential oils. 'Solvent extraction' is perhaps the most difficult of the three methods, and is generally used for flowers, which contain too little volatile oil to undergo expression. Instead, a solvent such as hexane or supercritical carbon dioxide is used to extract the oils.
These techniques have allowed essential oils to be used in all manner of products; from perfumes to cosmetics, soaps - and as flavourings for food and drinks as well as adding scent to incense and household cleaning products. The science, history and folkloric tradition of essential oils is incredibly fascinating - and a still much debated area. We hope the reader is inspired by this book to find out more.
LETTER OF TRANSMITTAL.
U. S. DEPARTMENT OF AGRICULTURE,
BUREAU OF PLANT INDUSTRY,
OFFICE OF THE CHIEF,
Washington, D. C., August 26, 1910.
SIR: I have the honor to transmit herewith and to recommend for publication as Bulletin No. 195 of the special series of this Bureau a manuscript by Mr. Frank Rabak, Chemical Biologist, entitled The Production of Volatile Oils and Perfumery Plants in the United States,
submitted by Dr. R. H. True, Physiologist in Charge of the Office of Drug-Plant, Poisonous-Plant, Physiological, and Fermentation Investigations.
There is a steady demand for information concerning plants yielding materials used in the manufacture of perfumery products; also concerning the processes and apparatus required to utilize these oil-bearing plants. This line of agricultural work has not yet reached any marked development outside of the peppermint industry in Michigan, New York, and Indiana, but the outlook for a further growth of this branch of special agriculture seems worth consideration. Much experimental work will be required to determine the most favorable locations for operation, and practical experience in handling the crops and the special apparatus needed in utilizing them must be accumulated. However, the economic significance of this class of products seems likely to justify the efforts required.
Respectfully,
G. H. POWELL,
Acting Chief of Bureau.
Hon. JAMES WILSON,
Secretary of Agriculture.
CONTENTS.
Introduction
Aroma of plants
Nature of odors
Localization of odors
Development of aroma
Extraction of aroma
Separation of perfumes by solution
Extraction with volatile solvents
Extraction with liquid fats
Extraction with solid fats
Separation of perfumes by expression
Separation of perfumes by steam distillation
Apparatus
Method of operation
Handling of volatile oils