Jump to main content
US EPA
United States Environmental Protection Agency
Search
Search
Main menu
Environmental Topics
Laws & Regulations
About EPA
Health & Environmental Research Online (HERO)
Contact Us
Print
Feedback
Export to File
Search:
This record has one attached file:
Add More Files
Attach File(s):
Display Name for File*:
Save
Citation
Tags
HERO ID
1633252
Reference Type
Journal Article
Title
Extraction of ginger (Zingiber officinale Roscoe) oleoresin with CO2 and co-solvents: a study of the antioxidant action of the extracts
Author(s)
Zancan, KC; Marques, MOM; Petenate, AJ; Meireles, MAM
Year
2002
Is Peer Reviewed?
Yes
Journal
Journal of Supercritical Fluids
ISSN:
0896-8446
Volume
24
Issue
1
Page Numbers
57-76
Web of Science Id
WOS:000177937600006
Abstract
The effects of temperature, pressure and the addition of
co-solvent (ethanol (EtOH) and isopropyl alcohol (IsoC3), both at 1.17% (mass)) on the kinetics
of extraction of ginger oleoresin were studied. The design used was a 2 x 2 x 3 factorial
(pressure 200 and 250 bar; temperature: 25 and 35 degreesC; solvent: CO2, CO2 + EtOH, CO2 +
IsoC3). The experimental setup used was a fixed bed extractor with diameter of 2.76 x 10(-2) m
and length of 0.387 m. The assays were carried out at a mean solvent flow rate of 5.86 x 10(-5)
kg/s and with a bed apparent density of 350 kg/m(3). The identification of the substances present
in the oleoresin was performed by GC-MS; GC-FID was used to determine the ginger extract
compositions. The antioxidant activity of the extract fractions was determined using the coupled
oxidation of linolenic acid and beta-carotene. The results show that the temperature and the
interaction of the pressure and the solvent significantly affected the total yield. For the mass
transfer rate, the effect of the interaction of the pressure and the solvent was significant; the
mass transfer rate increased with the pressure in the absence of the co-solvent and decreased
when ethanol and isopropyl alcohol were used. The major substances present in the ginger extracts
were alpha-zingiberene, gingerols and shogaols; the amounts of these compounds were significantly
affected by temperature, pressure and solvent. Nonetheless, the antioxidant activity of the
ginger extracts remained constant at approximate to80% and decreased to approximate to60% in the
absence of gingerols and shogaols. The Sovovd's model quantitatively described the overall
extraction curves. (C) 2002 Elsevier Science B.V. All rights reserved.
Keywords
supercritical CO2; Zingiber officinale Roscoe; antioxidant; co-solvent; mass transfer
Home
Learn about HERO
Using HERO
Search HERO
Projects in HERO
Risk Assessment
Transparency & Integrity