Oxidation of saturated fatty acids ethyl esters: laurate, myristate, palmitate and stearate was investigated by means of DSC
techniques under isothermal and non-isothermal conditions. The activation energies of isothermal oxidation were similar to
each other (112–123 kJ mol−1) and no influence of carbon length on the rate of oxidative decomposition was observed. Results obtained from non-isothermal
experiments were similar only for the first stage of oxidation.
Fatty acids from pentanoic to tricosanoic have been separated on RP-18 HPTLC plates, with and without concentrating zone, with methanol-water, ethanol-water, and
-propanol-water mobile phases. Separation factors (α), resolution (
), and Δ
values were calculated for all the chromatograms. Analysis showed that the most useful measures of the quality of the chromatographic separation of these fatty acids were the resolution,
, and Δ
. The best chromatographic conditions for separation of the fatty acids were RP-18 plates without concentrating zone and methanol-water, 90 + 10 (
), methanol-water, 95 + 5 (
), and ethanol-water, 90 + 10 (
), as mobile phases, and RP-18 plates with concentrating zone and methanol-water, 90 + 10 and 95 + 5 (
), 100% methanol, and ethanol-water, 90 + 10 and 95 + 5 (
), as mobile phases.
The type and amount of fatty acids uptaken by cells are of vital importance for health. In this study we investigated fatty acid uptake by cells in context with fatty acid supplementation. Due to cell incubation the concentration of fatty acids in the culture medium was dwindled, as expected. We observed that fatty acids prominent in the culture medium were diminished to a much greater extent than fatty acids contained in the medium in marginal amounts. The supplemented fatty acids were incorporated into the cells regardless of the type of fatty acid added. Beyond that, fatty acids from the n3 and the n6 family were metabolized, resulting in an increase of their desaturation and elongation products. The supplementation of the culture medium with a special fatty acid did not affect the incorporation rates of the remaining fatty acids contained in the culture medium. Thus, an increased supply of unsaturated fatty acids is not sufficient to lessen the uptake of saturated fatty acids by cells.
Authors:N. A. Santos, R. Rosenhaim, M. B. Dantas, T. C. Bicudo, E. H. S. Cavalcanti, A. K. Barro, I. M. G. Santos and A. G. Souza
biodiesel with excellent physical and chemical properties. However, data on babassu oil is limited, and a more detailed study of its rheological properties is needed because of its predominantly saturatedfattyacid composition.
In this study, the
Authors:H. M. Shafik, M. G. Saad and H. A. El-Serehy
Microalgae have emerged as one of the most promising sources for fatty acid production. Since the various fatty acid profiles (chain length, degree of unsaturation, and branching of the chain) of the different sources influence biodiesel fuel properties, it is important to possess data on how the presence of NaNO3 as nitrogen source can influence the profile of produced fatty acids from algae. The fatty acid profiles of Desmodesmus quadricaudatus and Chlorella sp. were detected in pure batch cultures experiments. BG-11 nitrogen free medium and the medium contained 1.5 g NaNO3 l–1 were used in this investigation. At late stationary growth phase in nitrogen free medium, Chlorella sp. produced 58.39% saturated fatty acids and 41.60% unsaturated fatty acids. While in medium contained 1.5 g NaNO3 l–1 Chlorella sp. produced 62.08% saturated fatty acids and 37.92% unsaturated fatty acids. In nitrogen free medium D. quadricaudatus produced 66.92% saturated fatty acids and 33.07% unsaturated fatty acids. While in cultures contained 1.5 g NaNO3 l–1D. quadricaudatus produced 51.62% saturated fatty acids and 48.37% unsaturated fatty acids.
The fatty acid profile of Chlorella sp. and D. quadricaudatus that isolated from Egyptian water body and grown in nitrogen free medium may be suitable for biodiesel production. The results discussed and compared to fatty acid profiles produced by other algal species.
Authors:A. Alqarawi, Abeer Hashem, E. Abd_Allah, T. Alshahrani and Asma Huqail
The present work was carried out to uncover the effect of salinity stress on shoot moisture percentage, pigment content and lipid composition of Ephedra alata Decne. The results suggested that salinity caused significant decrease in plant moisture content. The chl. a, b and carotenoids showed significant decrease with increasing concentration of salt. Total pigment content also showed decline at all salt stress levels. Salt stress caused significant decrease in total lipids (TL), triacylglycerol (TG) and sterol (S) accompanied with an increase in diacylglycerol (DG), sterol ester (SE), and non-esterified fatty acids (FAA) of E. alata. Moreover, saline stress caused significant decrease in all phospholipid fractions except phosphatidic acid which increases during salt stress. Salinity stress resulted in increase of saturated fatty acids and decreases the percentage of un-saturated fatty acids in E. alalta.
Authors:O. Bilgin, H. Orak, K. Korkut, İ. Başer, A. Orak and A. Balkan
The interrelationships among the grain protein, oil, fatty acids, starch, Na, K, Fe concentrations and chemical grain characteristics were determined by correlation analyses in thirty-five commercial dent corn hybrids. An increase in oil content of the corn is accompanied by a decrease in starch content and by an increase in caproic acid content. The correlation coefficients involving protein content of corn hybrids with oil content (
= 0.066) and with saturated fatty acid (SFA) (
= −0.247*) evidence that protein content is more related to fatty acid distribution than the oil quantity. Linear relationships between refractive index (RI) (nD40 °C) and saturated fatty acid (
= 0.369**) and between refractive index and oleic acid (
= 0.364**), and between iodine number (IN) and unsaturated fatty acid (UFA) were determined. In addition, oleic acid is strongly correlated with linoleic (
= −0.769**) and linolenic acids (
Authors:Eszter Sarkadi Nagy, Márta Bakacs, Éva Illés, Andrea Zentai, Andrea Lugasi and Éva Martos
Az Országos Táplálkozás és Tápláltsági Állapot Vizsgálat 2009 a negyedik az Országos Élelmezés- és Táplálkozástudományi Intézet által vezetett országos táplálkozási vizsgálatok sorában. Célok: A vizsgálat célja időszerű és megbízható adatok biztosítása a magyar felnőtt lakosság energia- és tápanyagbeviteléről, táplálkozási szokásairól. Módszerek: Az energia- és tápanyagbevitel meghatározása a 18 év feletti lakosság korra és nemre reprezentatív mintájának háromnapos, három lépcsőben ellenőrzött táplálkozási naplója alapján történt. Eredmények: A magyar lakosság táplálkozásában a bevitt energia túl nagy százalékát adják a zsírok (39 E% férfiak, 36 E% nők), ezzel szemben a szénhidrátok energiaaránya túl kevés (45 E% férfiak, 48 E% nők), a fehérje energiaaránya (15 E% férfiak, 15 E% nők) azonban megfelel az ajánlásoknak. Kedvező, hogy a 2003–2004-es felméréshez képest a férfiak rostbevitele nőtt. Kedvezőtlen, hogy a férfiak koleszterinbevitele és mindkét nemnél a telített zsírsavak energiaaránya túl nagy. Következtetések: A táplálkozási kockázati tényezők csökkentése feltétlenül hozzájárulna a táplálkozásfüggő betegségek morbiditási és mortalitási arányainak javulásához. Orv. Hetil., 2012, 153, 1057–1067.