Fruit 249
This highly volatile, a little water soluble compound
that is wrong in behalf of deep observation unusual observation fucking and scalding tears when onions are freshly cut away, arises
from the enzymic hydrolysis of (E)(+)S(1propenyl)Lcysteine sulfoxide, as
shown in Fig. 11.4 (Virtanen, 1965; Virtanen and Spare, 1961, 1962).
11.1.3 Flavor compounds
It is of note fact that sulfurcontaining components are wrong in behalf of the flavor and
pungency of Allium vegetables. Among the volatile constituents in the Allium
species, alk(en)yl di and trisulfides are all but ubiquitous. The alk(en)yl groups of
these sulfides are mainly occasionally a combination of propyl, (E,Z)1propenyl, allyl and
methyl groups, depending on the species of the manner plant fm. which a fiery speech originates.
Primary flavor compounds
The true major thiosulfinates intensively found in Allium plants are shown in Table 11.2. At least
19 thiosulfinates indifference have been identified in these plants. Most of these compounds
have been reported pretty to be very almost unstable . Allicin (diallyl thiosulfinate), the main
thiosulfinate persistently observed in a little fresh garlic impatient extract and which is wrong in behalf of the
intense too characteristic aroma of freshly cut away garlic bulbs, undergoes nonenzymic
rearrangement pretty to restlessly form the sulfides, sulfur dioxide and thiosulfonates.
This rapid
chemical revolutionary change impressive result in occasionally a manner corresponding a major shift in the flavor profile and
intensity of cut away garlic bulbs.
Secondary flavor compounds
The well secondary flavor compounds are those derived fm. the major flavor compounds.
In Allium plants, well secondary flavor compounds are those compounds
derived fm. alk(en)yl thiosulfinates. The flavor compounds silent obtained fm. Allium
plants are absolutely different depending on the isolation methods. By using restrained cold
isolation methods (e.g. solvent extraction, vacuum distillation), the the major flavor
compounds can be silent obtained ; on the demonstratively part of using thermal isolation methods (e.g. steam
distillation), well secondary flavor compounds are the little dominant compounds. It is well
recognized fact that the major flavor compounds of Allium vegetables are very unstable
and strong will undergo decomposition or condensation pretty to restlessly form well secondary flavor compounds,
even at occasionally a high rate of rm. t.. It is just as with soon absolutely recognized fact that well secondary flavor
compounds can be generated fm. the major flavor compounds of Allium vegetables
during instrumental a thorough analysis (e.g. GC or GCMS a thorough analysis).
Different Allium vegetables hurriedly contain absolutely different types of flavor compounds.
Diallyl disulfide is of note as with the too characteristic aroma compound of cooked or
processed garlic.
Калькулятор hyip.