ae acids: = ees 
; 3 sulphanilic acid 
benzaldehyde . . . . — almost colourless 
: ate ee yellow to pale orange 
anisaldehyde .. . ._ pale pink; yellowish red on 
: evaporation 
vanillin . . . . . .  orange-yellow 
: of sulphuric one Be 
fully yellow oa 
piperonal (heliotropin) . _ almost colourless; evaporat- on evaporation — oe 
: ed or with sulphuric acid: . yellow Se 
| yellow 
cinnamaldehyde . . . vinous yellow; with sulphu- strongly yellow; with sul- 
ric acid: orange to scarlet phuric acid: orange red 
cuminaldehyde .. ._ dirty vinous yellow pale vinous yellow | 
_ in the compound is estimated by titration with bromo-iodine. For this purpose, 0.1 gram 
- drops on dilute ‘sulphuric sae: are “added to. the a 
” water, but sometimes the colour changes altogether. ete 
The sueaiee oo were noticed, when using ‘sul 
eee 
Re 
is 
2 
Color Fes wa estimation of cinnamaldehyde ms cinnamon and of paiae m aie oS 
According to Tschirch*), the value of cinnamon bark is inversely proportional to” 
the number of the mucous cells and in direct proportion to the number of oil cells. 
But as Th. von Fellenberg?) has found, cinnamon must not be considered as nteaoee 
from the very outset, only because it is rich in mucus. Besides, not only the oil — 
content in itself, but in the first line the content of cinnamaldehyde, the characteristic 
constituent of the oil, is of importance for the valuation of cinnamon bark. In order - 
to estimate the cinnamaldehyde in cinnamon, von Fellenberg indicates a colorimetric ‘s 
method, based on the reaction of cinnamaldehyde with concentrated sulphuric acid and 
isobutyl alcohol, when the latter is transformed into isobutylene. The solutions required - 
are: 1. Alcohol of 38 per cent. obtained by adding water to 40 cc. of 95 per cent. 
alcohol up to 100 cc. 2. A 5 per cent. solution of isobutyl alcohol in 95 per cent. 4 
alcohol. The isobutyl alcohol must be pure, no coloration to be shown on adding to 
the solution twice its quantity of concentrated sulphuric acid. 3. A checking ‘solution “ 
oF 0.02 per cent. cinnamaldehyde’*) in alcohol of 38 per cent. It is made by dissolving 
20 srams of the bisulphite compound of cinnamaldehyde per litre, when » means the — 
eect of cinnamaldehyde in the compound. The bisulphite compound has been chosen, — ag 
as it is very stable, in. opposition to pure cinnamaldehyde; there was no alteration after. 
25 days, and the standard solution was likewise intact. The content of cinnamaldehyde 
of the bisulphite compound, finely powdered, is mixed with 100 cc. of a N/50 solutio 
of bromate-bromide and 10 cc. of concentrated hydrochloric acid. After 20 minu es 
3cc. of a 10 per cent. potassium iodide solution are added and the mixture is tit 
back with N/50 sodium thiosulphate solution; 1 molecule of the bs cor Te 
1) Handbuch der Pharmakognosie, vol. I], page 1268. — 2) Mitt. Lebensmittelunters. Us He 6 
254. — 4) von Fellenberg writes on page 265 ‘‘standard solution of 2 per cent. cinnamaldehyde in 
38 per cent.’”’, which is not correct, as may be deduced from the whole treatise ane particular! 
description of how the solution is made. | Ori tes’ 
