Letno poročilo 2005

Izdelke smo kemijsko in organolepti~no
ovrednotili in jim dolo~ili stabilnost. Isto~asno
smo pripravljali sintezo ciklodekstrinskih
kompleksov z novimi substancami in iskali
primerne nosilce za pripravo vodotopnih oblik
CoQ10.
- Spremljali smo stabilnost polifenolov v
dolo~enih ~asovnih obdobjih v sokovih iz
plodov ~rnega ribeza, pripravljenih z razli~nimi
na~ini predelave. V sokovih in koncentratih
smo spremljali vsebnost skupnih
polifenolov, skupnih antocianov, antioksidativno
u~inkovitost, vsebnost vitamina
C, identificirali in dolo~ili vsebnost posameznih
antocianinov, flavonolov in fenolnih
kislin. Koncentrate smo dodajali v jagodni
nektar v izbrani koncentraciji z namenom
izbolj{ati barvo, antioksidativno u~inkovitost,
predvsem pa stabilnost barve jagodnega
nektarja med staranjem na sobni temperaturi.
Nektarji z dodatki so imeli ve~jo antioksidativno
u~inkovitost, spremenjeno
SLIKA 1
Obisk prof. G. P. Littaruja in dr. Jose L. Quilesa na
Kemijskem in{titutu
Laboratorij za prehrambeno kemijo
Laboratory for Food Chemistry
juices with added concentrates had higher
antioxidant activity, higher colour intensity, a
red coloured hue, and more vitamin C. All
juices with added supplements were scored
better than juices without addition, at the
beginning and after storage. Now we are
looking for the agreement with food manufacturers
for application of our additives.
- Our activities within the European project
TOM were focused on the isolation of biologically
active compounds from the solid
residue of the tomato processing industry. In
different CO extracts of tomato waste ma-
2
terial we found an appreciable content of
triterpenoids, from which we succeeded to
identify and approximately quantify amyrin.
We developed new extraction, fractionation
and purification procedure for the isolation
of the enzymes pectin methylesterase (PME)
and polygalacturonase (PG) from fresh tomato
fruit. One of the main forms of tomato
PME that is applicable to the food industry
FIGURE1
Visit of Prof. G. P. Littaru and Dr. Jose. L. Quiles at the
National Institute of Chemistry
89