Chemistry of Essential Oils

LABIATE 199

Giaconi has distilled oils in the Dalmatian Archipelago at an alti-

tude of 900 metres, having the following characters:—

0-890 to 0-899

• 8° 30' „ - 10°
  ters.57-1 to 61-6 per cent.
  Schimmel & Co.^1 give the following analyses as indicating the effect
  of certain of these artificial esters on the analytical values of the oil.
  In this connection, the methods for the detection of artificial esters
  (Vol. II.) should be taken into consideration:—

Specific gravity

Optical rotation

Esters.

Lavender Oil.

<u
M>.
Soluble in 70 per
Cent. Alcohol

Acid value
Ester value after 1h.
sap. with 10 cc.
} n. Solution
Ester-content (calc.
for Linalyl Ac.).
Ester value after 2 h.
sap. with 20 c.c.
4 n. Solution
Ester value after 1h.
sap. with 10 c.c.
} n. Solution + 25
c.o. Alcohol.
Difference
Sap. value
Acid value II.
Difference
Terpinyl Acet. con-
tent about.
Esters of spar. vol.
Acids.
Glyceryl Ester

No. 1.

0-9007

- 3° 55'

2-5 vols.

a.m.

0-3

78-4

27-4 «

82-7

69-7

13-0

7K-7

75-7

3-0

57o

2.

0-6946

- 2° 34'

2-5 vols.

a.m.

0-5

83-3.

29-2 "'„

87-6

77-0

10-6

b3-8

83'7

0-1

i'L

not ascertainable

not ascertainable

3.

Original

Oil.

0-9072

- 5° 14'

1-9 vols.

a.m.

0-8

100-5

35-2 °

104-2

99-0

5-2

101-3

96-7

4-6

1Vdoubtful

J

Dist.

with

Steam.

0-8932

- 5° 37'

2-2 vols.

a.m.

102-5

35-9 °/ 0

104-6

100-6

4-0

102-5

100-6

1-9

4.

Original

Oil.

0-8992

- 4° 32'

2-5 vols.

a.m.

0-5

90-0

31-5 °/0

919

91-1

0-8

90-5

90-6

not ascertainable

not ascertainable

not asc.present

Shaken

once

with 5°

Alcohol.

87-0

30-4 °

—

—

_

—

5.

15 c.c. 10 c.o.

Seminormal

Potash Solution.

0-8913

- 8° 43'

4*5 vols.

a.m.

0-3

145-7

51 7o

146-0

144-1

1'9

—

—

—

_

—

0-3

143-4

146-0

132-9

13-1

—

—

—

—

The following remarks are applicable to the samples referred to in

the table. Nos. 1 and 2 contained terpinyl acetate; No. 3 was a pure,

but old resinified oil, as the analysis performed on it after steam distil-

lation proved; No. 4 contained glyceryl acetate; No. 5 was a pure oil,

N

but as its ester-content is so high, 10 c.c. of -~- alkali is insufficient for

a proper saponification, so that the only reliable indications are tho

s

e

when 15 c.c. of N/2KOH are used.

Schimmel & Co.^2 have examined a number of oils distilled by them-

selves at Barreme, which had the following characters:—

1

Report, April, 1912, 86.

2

Schimmel's Bericht, April, 1907, 73.