โ Scribed by Frederick B. Power; Victor K. Chesnut
No coin nor oath required. For personal study only.
No information on the nature of the substances to which the odor of the peach is due appears to have been recorded in chemical literattire.
Although many preparations designated as " peach oil " or " peach essence " have long been in use for flavoring purposes, they consist for the most part of purely empirical mixtures of esters and essential oils with other more specific aromatic substances.
In the present investigation only the fresh pulp of ripe Georgia Belle peaches was employed, and the 1)its were carefully excluded.
The results of the investigation and the conclusions therefrom may be summarized as follows :
I. The odorous constituents of the peach may be said to consist chiefly of the linalyl esters of formic, acetic, valeric, and caprylie acids, together wi,th a considerable p,roportion o.f acetaldehyde and a very small amoum of an aldehyde of higher n~olecular weight. It is probable that the volatile acids are present to some extent in a free state.
A minute amount of acetaldehyde is contained in the emanation from the entire ripe fruit.
No trace of hydrocyanic acid or benzaldehyde could be detected in the distillate from peach pulp. It may therefore be coneluded that the occurrence of the glucoside amygdalin is restricted to the kernels of the fruit, and that no other cocnpound capable of yielding hydrocyanic acid is present in the pulp.
By extracting a concentrated distillate of the peach with ether, a very small quantity of an essential oil was obtained. This was a pale yellow, limpid liquid, which possessed an exceedingly fragrant and intense peach-like odor. When cooled somewhat below the ordinary temperature, it formed a concrete, transparent mass, interspersed with minme, acicular crystals. These crystals evidently consisted of a paraffin hydrocarbon, which, when indirectly isolated, melted at about 52ยฐ: The yield of essential oil was o.ooo74 per cent. of the weight of pulp employed.
In addition to the esters mentioned, the peach oil contained a little acetaldehyde and furfural, the latter having doubtless been
๐ SIMILAR VOLUMES
BACKGROUND: Volatile compounds, together with sugars and acids, are the main chemical species determining the characteristic aroma and flavor of food. In peach, more than 100 volatiles have been identified. ## RESULTS: The essential oil of six peach and three nectarine accessions used in Italian b
2) large increase in 30" organisms at the end of the first twentyfour hours and marked decrease at end of first forty-eight hours; (3) gradual increase in thermophiles after first forty-eight hours; (4) gradual softening of corn and growth of mould, until at the end of the fourth day the corn was v