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March, 19601 ANALYTICAL METHODS COMMITTEE 165 Analytical Methods Committee ESSENTIAL OILS SUB-COMMITTEE Fiore Method for Determining Linalol: Amendment IN 1957, the Analytical Methods Committee published a Report by its Essential Oils Sub- Committee on The Determination of Linalol in Essential 0ils.l The respective merits of the Fiore and Glichitch methods were discussed, and, because the evidence then available indicated that the latter method was the more reliable, it was recommended as the method of choice. With the development in recent years of gas - liquid chromatography, a useful technique has been provided for investigating the course of certain chemical reactions. This technique was applied by Holness2 to studying the reactions of both the Glichitch and Fiore methods for determining linalol (both natural and synthetic), and it was shown that, of the two methods, the products of the Fiore reaction were much the simpler, although both methods gave repeatable results. However, it was concluded that potential sources of error are greater in the more complex Glichitch reaction; further, Holness2 has shown that results for linalol by the Glichitch method are consistently incorrect, being about 4 per cent. lower than the true value, whereas results by the Fiore method are only about 1 per cent. lower than the true value. In linalol-containing oils, compensating errors tend to narrow the differences in apparent linalol content as determined by the two methods. The Essential Oils Sub-committee, on whose behalf these experiments were performed, has given careful consideration to these findings and it has been unanimously agreed that the conclusions reached in the 1957 Report should be reversed, i.e., that the Fiore method should now be recommended as the method of choice. REFERENCES 1. 2. Analytical Methods Committee, “The Determination of Linalol in Essential Oils,” Analyst, 1957, Holness, D., Ibid., 1959, 84, 3. 82, 325. Published on 01 January 1960. Downloaded by Brown University on 26/10/2014 07:44:25. View Article Online / Journal Homepage / Table of Contents for this issue

Fiore method for determining linalol: amendment

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March, 19601 ANALYTICAL METHODS COMMITTEE 165

Analytical Methods Committee ESSENTIAL OILS SUB-COMMITTEE

Fiore Method for Determining Linalol: Amendment

IN 1957, the Analytical Methods Committee published a Report by its Essential Oils Sub- Committee on The Determination of Linalol in Essential 0ils.l The respective merits of the Fiore and Glichitch methods were discussed, and, because the evidence then available indicated that the latter method was the more reliable, it was recommended as the method of choice.

With the development in recent years of gas - liquid chromatography, a useful technique has been provided for investigating the course of certain chemical reactions. This technique was applied by Holness2 to studying the reactions of both the Glichitch and Fiore methods for determining linalol (both natural and synthetic), and it was shown that, of the two methods, the products of the Fiore reaction were much the simpler, although both methods gave repeatable results. However, it was concluded that potential sources of error are greater in the more complex Glichitch reaction; further, Holness2 has shown that results for linalol by the Glichitch method are consistently incorrect, being about 4 per cent. lower than the true value, whereas results by the Fiore method are only about 1 per cent. lower than the true value. In linalol-containing oils, compensating errors tend to narrow the differences in apparent linalol content as determined by the two methods.

The Essential Oils Sub-committee, on whose behalf these experiments were performed, has given careful consideration to these findings and it has been unanimously agreed that the conclusions reached in the 1957 Report should be reversed, i.e., that the Fiore method should now be recommended as the method of choice.

REFERENCES 1.

2.

Analytical Methods Committee, “The Determination of Linalol in Essential Oils,” Analyst, 1957,

Holness, D., Ibid., 1959, 84, 3. 82, 325.

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