19 research outputs found
Effect of chitosan coating with the addition of caraway essential oil and beeswax on oxidative stability of petrovskƔ klobƔsa sausage
The aim of this paper was to examine the effect of chitosan coating with the addition of caraway essential oil and beeswax on lipid oxidation protection, as well as aroma and water content preservation of traditional dry fermented PetrovskƔ klobƔsa sausage.
During the entire storage period, TBARS index value in coated sausage was lower compared to the control (Pā1 and 0.66Ā±0.03 mg kgā1, while after seven months of storage, these values were 0.82Ā±0.05 mg kgā1 and 0.67Ā±0.02 mg kgā1, respectively. While content of saturated aliphatic aldehydes increased in control sausage (P<0.05), it remained unchanged in coated sausage during 7 months of storage. Lipid oxidation protective effect could be correlated to higher marks for aroma of coated sausage during the entire storage period (P<0.05). Coating slowed moisture loss of coated sausage compared to the control (P<0.05)
Monolacunary Wells-Dawson Polyoxometalate as a Novel Contrast Agent for Computed Tomography: A Comprehensive Study on In Vivo Toxicity and Biodistribution
Polyoxotungstate nanoclusters have recently emerged as promising contrast agents for computed tomography (CT). In order to evaluate their clinical potential, in this study, we evaluated the in vitro CT imaging properties, potential toxic effects in vivo, and tissue distribution of monolacunary WellsāDawson polyoxometalate, Ī±2-K10P2W17O61.20H2O (mono-WD POM). Mono-WD POM showed superior X-ray attenuation compared to other tungsten-containing nanoclusters (its parent WD-POM and Keggin POM) and the standard iodine-based contrast agent (iohexol). The calculated X-ray attenuation linear slope for mono-WD POM was significantly higher compared to parent WD-POM, Keggin POM, and iohexol (5.97 Ā± 0.14 vs. 4.84 Ā± 0.05, 4.55 Ā± 0.16, and 4.30 Ā± 0.09, respectively). Acute oral (maximum-administered dose (MAD) = 960 mg/kg) and intravenous administration (1/10, 1/5, and 1/3 MAD) of mono-WD POM did not induce unexpected changes in ratsā general habits or mortality. Results of blood gas analysis, CO-oximetry status, and the levels of electrolytes, glucose, lactate, creatinine, and BUN demonstrated a dose-dependent tendency 14 days after intravenous administration of mono-WD POM. The most significant differences compared to the control were observed for 1/3 MAD, being approximately seventy times higher than the typically used dose (0.015 mmol W/kg) of tungsten-based contrast agents. The highest tungsten deposition was found in the kidney (1/3 MADā0.67 Ā± 0.12; 1/5 MADā0.59 Ā± 0.07; 1/10 MADā0.54 Ā± 0.05), which corresponded to detected morphological irregularities, electrolyte imbalance, and increased BUN levels
Tocopherol composition in cold-pressed oil of Serbian confectionary sunflower (Helianthus annuus L.) hybrids
Sunflower (Helianthus annuus L.) is an important oilseeds crop among the four major
oilseeds crop cultivated in the world viz., soybean, brassica, sunflower and groundnut. Two
types of sunflower are grown viz., gil seed purpose and non- oil seed sunflower for
commercial market. Non-oilseed sunflower is known as confectionery sunflower and their
seed generally is larger than that of the oilseed types and has a lower oil percentage with
high protein and sugar content. Vegetable oils are significant sources of antioxidants in
human nutrition. Natural antioxidants present in oils have obtained substantial attention
because of their health and nutritional effects. Plants produce of antioxidant compounds
such as tocopherols and tocotrienols to prevent oxidation of the susceptible substrate.
Antioxidant properties the tocopherols content of oils can give human health benefits like
modulating cancer, cardiovascular diseases and a protective effect by lowering LDL
cholesterol by inhibiting cholesterol biosynthesis. Over the last few years, increased interest
for natural antioxidant in cold-pressed plant oils has been observed since they have better
nutritive properties in comparation to refined ones. The aim of this study was to investigate
tocopherols composition (a-, B-, y- tocopherols) in selected 10 cold-pressed sunflower oils
obtained from confectionary sunflower hybrids cultivated in Serbia (2017 harvest).
Quantification of tocopherols was carried out using high performance liquid
chromatographyon a column Nucleosil 100-5 NHz with fluorescence detection (Acx=280 nm,
hem=340 nm). The mobile phase was n-hexane/ethyl acetate (70/30, v/v) with a flow rate of
1 ml/min. Total tocopherols content in cold-pressed sunflower oils ranged from 413.13
mg/kg in NS-H-6791 hybrid to 720.99 mg/kg in NS-H-6488 hybrid. Major vitamers for those
tested hybrids was a- tocopherol. The results have shown that there were significant
differences in tocopherols composition and content among the hybrids, indicating the great
genetic potential for improvement
The content of buckwheat flour in wheat bread
Seven samples of bread were prepared in a special way. Samples were made of a
mixture of wheat and buckwheat flour in defined proportions. Carbohydrates
from crumbs of bread were derivatized with BSTFA and analyzed by GC-MS.
Multivariate analysis was applied. The purpose of this study was not the
identification and quantification of carbohydrate composition. The results
demonstrated a clear relation between the carbohydrate composition of the
bread samples and the type of flour used for their production.[Projekat
Ministarstva nauke Republike Srbije, br. TR 31066 i br. III 46005
Determination of the trans fatty acid content of Serbian shortenings by gas chromatography-mass spectrometry
The fatty acid composition and trans fatty acid (TFA) content of Serbian shortenings were determined by capillary gas chromatography-mass spectrometry. The saturated, cis-monounsaturated and polyunsaturated fatty acid contents were within the ranges of 16.0ā89.0, 4.9ā41.9 and 0.0ā23.2% of total fatty acids, respectively. Among the saturated fatty acids, palmitic acid (4.8ā48.7%) was dominant and its higher amount indicates that palm oil was the major contributor in the shortening manufacturing. The content of total trans fatty acids ranged from 0.0% to 48.7% of total fatty acids and the mean was 27.4%. Trans 18:1 isomers were the major group of TFA present in analysed samples, representing 94.2% of total trans isomers. The content of all 18:2 trans isomers ranged from 0.0% to 3.6% of total fatty acids. Among thirty-four analysed samples only six contained low level of TFA (0.0ā3.1%) while the rest contained very high amounts of TFA (10.2ā48.7%) which clearly indicate that partially hydrogenated vegetable oils are still the major raw materials used in the production of shortenings in Serbia
Optimizacija postupka ekstrakcije polifenola iz pogaÄe konzumnog suncokreta
Seme suncokreta se odavnina koristi u Ijudskoj ishrani i u danaSnje vreme predstavlja jednu
od najvise gajenih uljanih kultura u svetu. Razlikuju se dva tipa suncokreta koji se gaje, uljani
tip | konzumni tip. Uljani tip suncokreta se proizvodi za dobijanje jestivog biljnog ulja, dok
se konzumni suncokret odlikuje manjim sadrzajem ulja i visokim sadrzajem proteina i drugih
bioloski aktivnih jedinjenja, i koristi se preteZno za lIjudsku ishranu usled visoke hranljive
vrednosti. U poslednje vreme, mogucnost proizvodnje ulja od konzumnog suncokreta je
predmet interesovanja kako u nauƩnim krugovima, tako i u krugovima proizvodaga i
preradivaƩa. Ulja iz konzumnog suncokreta dobijaju se cedenjem, tj. primenom mehanickih
presa i delovanjem sile na seme. Nerafinisano, hladno cedeno ulje poseduje karakteristiā¬na
senzorna svojstva i sadrzi ocuvane bioaktivne komponente koje potiā¬u iz semena
suncokreta. Usled odsustva rafinacije, ova ulja su specificna po svom izgledu, boji, mirisu i
ukusu, hemijskom sastavu, nutritivnoj vrednosti i odrzivosti. Nakon mehanickog izdvajanja
ulja presovanjem semena zaostaje pogaca koja praktiĀ¢no predstavija otpad iz prehrambene
industrije i najƩeƩe se koristi za ishranu Zivotinja. Pored visokog sadrzaja proteina, pogaca
sadrizi znaƩajne koliƩine biologki aktivnih jedinjenja, te moze predstavijati polaznu sirovinu
za dobijanje ekstrakata koji sadrze visoko vredna jedinjenja i koji bi dalje mogli da se koriste
za obogacivanje prehrambenih proizvoda ili kao dodaci u farmaceutskim proizvodima.
Polifenoli, pored ostalih vaznih jedinjenja, predstavijaju veoma znacajnu grupu supstanci
koje se nalaze u konzumnom suncokretu. Unosenje ove vrste jedinjenja hranom ima
visestruke efekte na |judsko zdravije, prvenstveno povezanih sa njihovom izrazenom
antioksidativnom aktivnoscu i sposobnosti eliminacije slobodnih radikala. Konzumacija
hrane bogate antioksidantima smanjuje inflamaciju i nivo oksidativnog stresa kod ā¬oveka.??
Takode oni pozitivno utiā¬u na celokupan kardiovaskularni sistem i proces starenja.
Istrazivanja su potvrdila pozitivnu ulogu polifenolnih jedinjenja u prevenciji razvoja raka,
kardiovaskularnih bolesti, dijabetesa, osteoporoze i neurodegenerativnih bolesti.? $
obzirom na pozitivno dejstvo na zdravije ljudi, otuda i veliko interesovanje za proucavanje
ovih prirodnih jedinjenja, kao i ispitivanje njihovih novih potencijalnih izvora unosa.
Za ekstrakciju polifenola iz razlicitih biljnih materijala mogu se koristiti razliĀ¢ite tehnike
ekstrakcije. UobiƩajeni postupci ekstrakcije su nedovoljno efikasni i ne omogucavaju visoko
iskoriscenje biljnog materijala, zahtevaju upotrebu znaĀ¢ajno vecih kolicina organiskih
rastvaraca, uz istovremeni veliki utroSak energije usled dugotrajnih procesa ekstrakcije,
neophodnosti zagrevanje i mesanja. U poslednje vreme se mnogo cesce koriste moderne
tehnike kao Sto su mikrotalasna i ultrazvuƩna ekstrakcija koje se ubrajaju u metode ,,zelene
ekstrakcijeā i imaju za cilj zastitu Zivotne sredine i opsteg zdravlja Ijudi. Generalno, koncept
zelenih tehnika podrazumeva smanjenje ili eliminaciju primene toksiĀ¢nih rastvaraca za
ekstrakciju uz istovremeno povecanje iskoriscenja procesa kroz manji utrosak energije,
manje generisanje otpada, kraĀ¢e vreme trajanja procesa i manje angazovanje operatera
Sunflower seed cake as a potential bioresource for isolation of flavonoids
Sunflower seed cake is remaining after isolation of oil from sunflower seeds and practically
represents a waste from production of cold pressed sunflower oils. This waste product is
consider as a viable potential source of various natural compounds and can be exploited for
the production of new products and isolation of valuable substances such as biologically
active compounds and nutraceuticals. In addition, isolation of biologically active substances
from food waste represents the way for recycling and may be economically attractive as well.
Flavonoids represent a group of polyphenol compounds with a high antioxidant power. These
phytochemicals are known to reduce many chronic diseases such as cardiovascular diseases,
heart diseases, diabetes, obesity and certain cancer [1]. In this work we investigated the
flavonoids content in seven sunflower seed cakes coming from cold pressed oil production.
Flavonoids are extracted by using 80% ethanol and ultrasound-assisted extraction at 30Ā°C for
10 minutes. Total flavonoid content is determined by a colorimetric method [2]. The results
showed that sunflower seed cakes contained significant amounts of total flavonoids. The total
flavonoids content is found to be in the range from 12.3 to 24.6 mg of catechin equivalent/g.
The results proved that sunflower seed cakes obtained from cold pressed oil production
represent valuable by-product and can be used as a raw material for isolation of bioactive
flavonoids which could be further applied for development of various functional foods