George Liviu POPESCU


18-8 LIMONENUL CA SURSĂ DE MATERII PRIME DIN RESURSE REGENERABILE

LIMONENE AS A RAW MATERIAL FROM
REGENERABLE SOURCES
Limonene is a monoterpenic compound extracted from citrus peels.
Limonene can be used as is due to its characteristic pleasant smell or can be
used as raw material for a series of synthesis in order to obtain valuable
compounds. Being a non-polar organic compound it may be used as a solvent
for non-polar organic compounds, including polystyrene. This paper presents a
succinct set of data from the literature related to the obtaining and possible
applications of limonene.
Cuvinte cheie: limonen, ulei de citrice, polymer

8 LIMONENUL CA SURSĂ DE MATERII PRIME DIN


18-9 PURIFICAREA LIMONENULUI OBłINUT PRIN DISTILARE CU VAPORI DE APĂ

PURIFFICATION OF LIMONENE OBTAINED BY STEAM
DISTILLATION
The paper presents the results obtained by steam distillation of
limonene from citrus peels. FT-IR spectra are presented for a sample of
limonene following the preparation in comparison with the spectra for a sample
purified by extraction in trichloroethylene and dehydrated with magnesium
sulphide. The paper has mainly a teaching character, in order to teach
laboratory techniques such as steam distillation, extraction, drying for
purification. The identification of some adsorption bands in IR spectra is also a
good practice in order to consolidate the theoretical knowledge’s.
Cuvinte cheie: limonen, extracŃie, proces de distilare, spectrometru
FT-IR

9 PURIFICAREA LIMONENULUI OBłINUT PRIN


18-16 OBłINEREA ANTOCIANINELOR PRIN PROCEDEE DE EXTRACłIE

THE OBTAINING OF ANTHOCYANINS
BY EXTRACTION
The paper presents the results obtained by extraction of anthocyanins
from red cabbage by different methods (Soxhlet extraction, extraction under
microwave irradiation, ultrasonic extraction, extraction by boiling). It presents a
method for analysis of extracted compound using VIS spectroscopy. The
variation of optical properties of the extract depending on pH is also presented.
Cuvinte cheie: antocianine, procedee de extracŃie, spectroscopul UVVIS

16 OBłINEREA ANTOCIANINELOR PRIN