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Wyszukujesz frazę "Betacyanins" wg kryterium: Temat


Tytuł:
Liquid chromatographic techniques in separation of betacyanins and their derivatives from red beet roots
Autorzy:
Spórna, A.
Stalica, P.
Jerz, G.
Szaleniec, M.
Wybraniec, S.
Powiązania:
https://bibliotekanauki.pl/articles/115819.pdf
Data publikacji:
2010
Wydawca:
Fundacja na Rzecz Młodych Naukowców
Tematy:
betanin
betalains
betacyanins
ion-pair counter-current chromatography
perfluorinated carboxylic acids
Opis:
A study on separation of betacyanins and their decarboxylated as well as dehydrogenated derivatives obtained from red beet roots (Beta vulgaris L.) in high pressure liquid chromatography (HPLC) and ion-pair high-speed counter-current chromatography (IP-HSCCC) was performed. The IP-HSCCC process was accomplished in the ‘head-to-tail’ mode in a solvent system composed of butanol — acetonitrile — water (5:1:6 v/v/v, acidifi ed with 0.7% trifl uoroacetic acid). The HPLC separation was performed in a typical reversed phase mode with mass spectrometry (ESI-MS) and diode-array (DAD) detection. The chromatographic profi les of betalains obtained in these two techniques were signifi cantly diff erent. In HPLC, the most polar compounds, like betanin and isobetanin, eluted before less polar decarboxylated and dehydrogenated derivatives (mostly degradation products of betanin). In IP-HSCCC, the dehydrogenated derivatives were eluted faster then their non-dehydrogenated analogues. It was observed for the fi rst time that betanin and neobetanin (14,15-dehydrogenated betanin), which are present in many plants containing betalains, had reversed elution orders during chromatographic separation by these two techniques.
Źródło:
Challenges of Modern Technology; 2010, 1, 1; 19-22
2082-2863
2353-4419
Pojawia się w:
Challenges of Modern Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
High salt-solvent systems in separation of betanin and its derivatives from red beet (Beta vulgaris L.) by high-performance countercurrent chromatography (HPCCC)
Autorzy:
Spórna-Kucab, A.
Ignatova, S,
Garrard, I.
Wybraniec, S.
Powiązania:
https://bibliotekanauki.pl/articles/115564.pdf
Data publikacji:
2012
Wydawca:
Fundacja na Rzecz Młodych Naukowców
Tematy:
betanin
betalains
betacyanins
countercurrent chromatography
Beta vulgaris L.
Opis:
A study on a separation of betanin and its decarboxy- and dehydro-derivatives obtained from red beet roots (Beta vulgaris L.) using analytical high-performance countercurrent chromatography (HPCCC — Dynamic Extractions Ltd., UK) was performed. The HPCCC process was accomplished in the ‘tail to head’ mode with three highly polar solvent systems with high salt concentrations: 1-propanol-acetonitrile-saturated ammonium sulphate-water (v/v/v/v, 1:0.5:1.2:1); ethanol-acetonitrile-1- propanol-saturated ammonium sulphate-water (v/v/v/v/v, 0.5:0.5:0.5:1.2:1) and ethanol-1-butanol-acetonitrile-saturated ammonium sulphate-water (volume ratio), 0.5:0.5:0.5:1.2:1). HPLC analysis was performed in a conventional reversed phase mode with diode-array (DAD) detection to characterize the composition of obtained fractions. The applied solvent systems enabled the separation of the betalain pigments with high efficiency for the first time. In the mode of separation selected, the more hydrophobic compounds eluted first as expected. Moreover, for the first time, the applied HPCCC solvent systems generated a separation of 2-decarboxy-betanin from 17- and 2,17-bidecarboxy-betanin as well as from neobetanin and betanin.
Źródło:
Challenges of Modern Technology; 2012, 3, 1; 57-61
2082-2863
2353-4419
Pojawia się w:
Challenges of Modern Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of EDTA on stabilization of decarboxylated betalains
Autorzy:
Skopińska, A.
Starzak, K.
Wybraniec, S.
Powiązania:
https://bibliotekanauki.pl/articles/115483.pdf
Data publikacji:
2012
Wydawca:
Fundacja na Rzecz Młodych Naukowców
Tematy:
betacyanins
decarboxylation
Beta vulgaris L.
EDTA
Opis:
Betalains are known to be very sensitive to several factors, including higher temperature, therefore, the studies on their stability are essential for the food industry. In order to determine the stability of betanin derivatives during thermal treatment, a set of degradation experiments was performed, including the protective infl uence of EDTA as a chelating agent. The pigments were dissolved in aqueous solutions of acetonitrile, methanol and ethanol. The studies on thermal degradation of the pigments confi rmed their high lability in all investigated solvents. Under the infl uence of protective activity of EDTA, the rate of the degradation of the decarboxylated betalains was substantially decreased. The analysis of obtained absorption spectra of the degradation products indicated that under the infl uence of EDTA, the products retained the basic chromophoric skeleton.
Źródło:
Challenges of Modern Technology; 2012, 3, 4; 29-33
2082-2863
2353-4419
Pojawia się w:
Challenges of Modern Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spectrophotometric study on betanin photodegradation
Autorzy:
Skopińska, A.
Tuwalska, D.
Wybraniec, S.
Starzak, K.
Mitka, K.
Kowalski, P.
Szaleniec, M.
Powiązania:
https://bibliotekanauki.pl/articles/115905.pdf
Data publikacji:
2012
Wydawca:
Fundacja na Rzecz Młodych Naukowców
Tematy:
betanin
betacyanins
photodegradation
Beta vulgaris L.
Opis:
The most commonly occurring betacyanin plant pigment in nature is betanin (5-O-glucoside of betanidin). Its main source is red beet root (Beta vulgaris L.), used for production of food colorants on a commercial scale [1]. Due to photo-lability of betacyanins, an eff ect of UV-irradiation on betanin degradation in various solutions containing organic solvents was investigated. Organic solvents are used frequently in many stages of pigment preparation or isolation, therefore, knowledge of betalain stability and degradation characteristics in these solutions is essential. Pigment solutions at a concentration of 1 mg/ml were prepared in diff erent solvents: water as well as aqueous solutions of 50% (v/v) acetonitrile, 50% (v/v) methanol or 50% (v/v) ethanol, at the pH range 3–8. Acetate, phosphate and citrate buff ers were used for the experiments. As a result of the pigment photo-decomposition, numerous decarboxylated and dehydrogenated derivatives were formed. Spectrophotometric studies enabled determination of the pigment retention (percentage of the pigment residue relative to its initial concentration after decomposition time). The studies demonstrated betanin high lability in all solvents, not only at extreme pH values, but also in the middle pH range which, in general, provides higher stability of betalains.
Źródło:
Challenges of Modern Technology; 2012, 3, 4; 34-38
2082-2863
2353-4419
Pojawia się w:
Challenges of Modern Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spiral-coil countercurrent chromatographic separation of betanin and betanidin ethyl-esters monitored by continuous ESI-MS/MS injection and LC-ESI-MS/MS
Autorzy:
Tuwalska, D.
Szot, D.
Wybraniec, S.
Winterhalter, P.
Jerz, G.
Powiązania:
https://bibliotekanauki.pl/articles/115897.pdf
Data publikacji:
2013
Wydawca:
Fundacja na Rzecz Młodych Naukowców
Tematy:
spiral-coil countercurrent chromatography (spCCC)
betacyanin ethyl-esters
betalains
betacyanins
betanin
betanidin
Opis:
Betalains present in Beta vulgaris L. (Chenopodiaceae) have a high potential as natural pigments for food applications. They have been used as a substitute of synthetic dyes in processing of gelatine, strawberry yogurts, ice creams, fruits cocktails, candies and biscuits. The stability of betalains is strongly influenced by numerous factors – sugar content, and impact of light, oxygen, water activity, pH and temperature. A mixture of betacyanin mono-, di- and tri-ethyl-esters was separated by a large-volume spiral-coil countercurrent chromatography (spCCC) prototype which yielded fractions continuously off-line injected to an ESI-MS/MS device. This method yielded a reconstituted pigment profile and finally enabled the MS-target-guided isolation procedure for the whole spCCC-experiment. The individual fractions were analyzed by LC/ESI-MS/MS. Betanin and betanidin mono-, di- and tri-ethyl-esters as well as other decarboxylated derivatives were detected in the chromatograms. The ethyl-esters of betanin were only partially fractionated, but clearly fractionated from the ethyl-esters of betanidin which will be of great value for biological evaluations.
Źródło:
Challenges of Modern Technology; 2013, 4, 4; 21-25
2082-2863
2353-4419
Pojawia się w:
Challenges of Modern Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reactions of decarboxylated betanins under influence of halogen light
Autorzy:
Skopinska, A.
Szot, D.
Starzak, K.
Wybraniec, S.
Powiązania:
https://bibliotekanauki.pl/articles/115710.pdf
Data publikacji:
2014
Wydawca:
Fundacja na Rzecz Młodych Naukowców
Tematy:
betanin
decarboxylated betacyanins
photolability
mass spectrometry
betanina
dekarboksylacja betacyjaniny
spektrometria masowa
Opis:
Betalains as natural plant pigments are very sensitive to several factors, including light, therefore, studies on stability of their derivatives which retain their attractive color, are crucial for their potential application in pharmaceutical, food or cosmetic industries. An effect of irradiation by halogen light on reactivity of main decarboxylated derivatives of betacyanins (2-decarboxy-betanin, 17-decarboxy-betanin and 2,17-decarboxy-betanin) was investigated in aqueous and organic-aqueous solutions: 50% (v/v) acetonitrile, 50% (v/v) methanol and 50% (v/v) ethanol, at pH range 3-8. The double decarboxylation of betanin (at C-2 and C-17 position of carbon) significantly increases the stability of this pigment in the acidic media. As a result of pigments reactions induced by light, some betacyanin derivatives with different decarboxylation and dehydrogenation levels were identified by chromatography with tandem mass spectrometry (LC-MS/MS) and diode array detection (LC-DAD).
Źródło:
Challenges of Modern Technology; 2014, 5, 3; 37-43
2082-2863
2353-4419
Pojawia się w:
Challenges of Modern Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reduction of Selected Betacyanins
Autorzy:
SZOT, DOMINIKA
STARZAK, KAROLINA
SKOPIŃSKA, ANNA
WYBRANIEC, SŁAWOMIR
Powiązania:
https://bibliotekanauki.pl/articles/1034140.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
Tematy:
1
7-diazaheptamethin
LC-MS
betanin
chromophore
decarboxy-betacyanins
reduction
Opis:
Betacyanins are conjugates of betalamic acid and glycosylated cyclo-DOPA which bring about the creation of a specific chromophoric system, the 1,7-dia- zaheptamethin chain. Betanin, a betacyanin pigment from red beet (Beta vulga- ris L.), as well as its decarboxylated derivatives were subjected to reduction with the use of NaBH4. The pigment structures contain a vinyl linker which is postu- lated to be protonated during reaction with NaBH4. In this study, 17-decarboxy- betanin and 2,17-bidecarboxy-betanin were obtained from betanin, which had been previously isolated from red beet root (Beta vulgaris L.). Purified pigments were tested in the presence of the reduction reagent while looking for the prod- ucts of the reaction identified by LC-MS.
Źródło:
Zeszyty Naukowe Towarzystwa Doktorantów Uniwersytetu Jagiellońskiego. Nauki Ścisłe; 2014, 8; 265-273
2082-3827
2084-977X
Pojawia się w:
Zeszyty Naukowe Towarzystwa Doktorantów Uniwersytetu Jagiellońskiego. Nauki Ścisłe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Semi-synthesis of red beet betacyanin ethyl-esters by esterification
Autorzy:
Tuwalska, D.
Starzak, K.
Szot, D.
Wybraniec, S.
Winterhalter, P.
Jerz, G.
Powiązania:
https://bibliotekanauki.pl/articles/115735.pdf
Data publikacji:
2014
Wydawca:
Fundacja na Rzecz Młodych Naukowców
Tematy:
betacyanin ethyl-esters
betalains
betacyanins
betanin
betanidin
esterification
estry etylowe
betalainy
betacyjaniny
betanina
betanidyna
estryfikacja
Opis:
Red beet pigments recovered from Beta vulgaris L. (Chenopodiaceae), mainly consist of purple betacyanins, such as 15R/15S-betanin. Currently,this pigment class is intensively investigated in respect of stability in food systems. Quite popular is the use of red beet extracts in dairy products such as yoghurts, and ice-creams. So far, there are no issues of toxicity using these natural pigments in food – so they seem to be a very good alternative to replace synthetic dyes which had been frequently discussed for negative side-effects to human health. Betacyanins, the glycosidation products of betanidin are very polar and therefore water soluble pigments, which are biosynthetically derived from condensation of cyclo-DOPA and betalamic acid. The significant polarity of betacyanins requires the use of ion-pair reagents such as trifluoro-acetic acid (TFA) or other homologue fluorinated additives under standard separation conditions on larger scale in spiral coil countercurrent chromatography (spCCC). In our synthetic experiment, the polarity of the natural betacyanins was reduced. This omitted the use of toxic per-fluoro ion-pair reagents. The three carboxylic groups of the betanin pigment backbone were the target functional groups of the derivatisation. In semi-synthesis, fortified red beet pigment extract was esterified with water-free ethanolic hydrogen chloride solution. The reaction was carried out at ambient temperature (7 days) to yield a mixture of betacyanin mono-, di- and tri-ethyl-esters, and their epimeric forms, as well as the respective betanidin-ethyl-esters. The time course of the reaction mixture was monitored by analytical C18-HPLC with ESI-DAD-MS/MS detection. The detected molecular weights of the pigments confirmed the presence of expected products. To the best of our knowledge, the presence of betalains containing ethyl-ester groups in biological samples have not been studied before.
Źródło:
Challenges of Modern Technology; 2014, 5, 3; 27-31
2082-2863
2353-4419
Pojawia się w:
Challenges of Modern Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of citric acid on stabilization of betanin solutions
Autorzy:
Skopińska, A.
Szot, D.
Tuwalska, D.
Starzak, K.
Osiadło, M.
Wybraniec, S.
Powiązania:
https://bibliotekanauki.pl/articles/115716.pdf
Data publikacji:
2014
Wydawca:
Fundacja na Rzecz Młodych Naukowców
Tematy:
betanin
betacyanins
citric acid
Beta vulgaris L.
betanina
betacyjaniny
kwas cytrynowy
Opis:
Elevated temperature is known to be the most crucial factor influencing betanin integrity during food processing and storage. Nevertheless, certain chelating agents or antioxidants, such as acetic acid, may act as stabilizers. Therefore, the effect of citric acid on the stability of betanin – basic betacyanin – was investigated during the heating experiments in water as well as 50% and 95% (v/v) aqueous-organic solutions of methanol, ethanol and acetonitrile. The presence of citric acid in tested solutions affects betanin stability, especially in the 95 % solutions, in which the stabilizing effect of this compound is significantly higher than in aqueous solutions. However, some decrease of retention in 50% methanol was also observed. The main products of betanin thermal degradation in aqueous and aqueous-organic solutions were compounds characterized by absorption bands around the wavelength at 420 nm.
Źródło:
Challenges of Modern Technology; 2014, 5, 2; 19-24
2082-2863
2353-4419
Pojawia się w:
Challenges of Modern Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal degradation of 17-decarboxy-betanin monitored by LC-MS
Autorzy:
Szot, D.
Starzak, K.
Skopińska, A.
Tuwalska, D.
Wybraniec, S.
Powiązania:
https://bibliotekanauki.pl/articles/115566.pdf
Data publikacji:
2014
Wydawca:
Fundacja na Rzecz Młodych Naukowców
Tematy:
17-decarboxy-betanin
betacyanins
thermal degradation
17-dekarboksy-betanina
betacyjaniny
degradacja termiczna
Opis:
A thermal stability study on 17-decarboxy-betanin depending on physicochemical process conditions was conducted. 17-decarboxy-betanin is one of betacyanin, natural origin pigments applied in food and pharmaceutical industry instead of artificial colorants. There is a need for searching of new non-toxic natural food components and this is a reason of increasing interest of betacyanins. As most derivatives of betanin obtained by decarboxylation, 17-decarboxy-betanin tends to degrade in the presence of some factors such as increased temperature or other conditions of the reaction environment [1]. This subject was investigated in this study because the stability of the pigments is still a significant issue limiting their wide application. The degradation of 17-decarboxy-betanin during heating in selected solutions: water as well as aqueous solutions of ethanol 50% (v/v), methanol 50% (v/v) and acetonitrile 50% (v/v) at pH in the range 3-8 was tested. As UV-Vis spectra indicate, 17-decarboxy-betanin tends to degrade mostly at pH 3, notwithstanding a type of solution. The products of degradation were identified by LC-DAD-ESI-MS. As a result of incubation at 85°C in different solutions, various mono-, bi- and tridecarboxylated as well as dehydrogenated derivatives were obtained. The dominant product of 17-de-carboxy-betanin degradation is 2,15,17-tridecarboxy-2,3-dehydro-betanin.
Źródło:
Challenges of Modern Technology; 2014, 5, 3; 32-36
2082-2863
2353-4419
Pojawia się w:
Challenges of Modern Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chromatographic fractionation of betacyanins from flowers of Gomphrena globosa
Autorzy:
Szot, D.
Starzak, K.
Skopińska, A.
Wybraniec, S.
Powiązania:
https://bibliotekanauki.pl/articles/115427.pdf
Data publikacji:
2015
Wydawca:
Fundacja na Rzecz Młodych Naukowców
Tematy:
betacyanins
Gomphrena globosa
plant pigments
LC-MS
betacyjaniny
Gomfrena kulista
barwniki roślinne
Opis:
In this study, a chromatographic fractionation of betacyanin pigments from extract of purple Gomphrena globosa petals was performed by preparative high performance liquid chromatography (prep-HPLC). The particular betacyanins in each collected fractions were tentatively identified by chromatography with optical amd mass spetrometric detection (LC-DAD-ESI-MS). Betacyanins are natural pigments, which are confirmed to have an antioxidant activity. It was reported that betacyanins can prevent civilization diseases, because of an ability of free radicals scavenging. Betacyanins are present in tissue of plants from Amaranthaceae family, e.g. in petals of Gomphrena globosa. Preparative separation of these particular pigments is difficult, because they are structurally very similar to each other and tend to coelute. However, in this study, fractions, containing a dominant amount of the principal pigments of Gomphrena globosa inflorescences, were obtained successfully. In the first fractions, two isomeric pigments assigned to gomphrenin I and isogomphrenin I were detected. The fractions of significant amounts of gomphrenin III and isogomphrenin III were obtained separately with sufficient purity. The presence of other, minor gomphrenin-type betacyanins were also confirmed as: gomphrenin II, cis-isomer of gomphrenin II and sinapoyl-gomphrenin I as well as their 15S-diastereomers. Moreover, in other fractions, various unknown pigments were detected.
Źródło:
Challenges of Modern Technology; 2015, 6, 2; 19-23
2082-2863
2353-4419
Pojawia się w:
Challenges of Modern Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Cu (II) Cations on 2-Decarboxy-betanin Stability in Aqueous-Organic Solutions
Autorzy:
Skopińska, A.
Szot, D.
Starzak, K.
Wybraniec, S.
Powiązania:
https://bibliotekanauki.pl/articles/115534.pdf
Data publikacji:
2015
Wydawca:
Fundacja na Rzecz Młodych Naukowców
Tematy:
betacyanins
2-decarboxy-betanin
copper ions
betalain stability
Beta vulgaris L.
betacyjaniny
2-dekarboksy-betanina
jony miedzi
stabilność betalainy
Opis:
Several important factors, such us pH, exposure to light, oxygen or temperature affect significantly the betalain stability. In particular, the heavy metal ions exert negative effect on stability of betalain colorants and accelerate pigment decomposition. Trace amounts of metal ions may be present in the food products, as well as in food packaging, leading to undesirable colour changes or even discoloration of betalainic foodstuffs. Decarboxylated betalains, such as 2-decarboxy-betanin, generated, e.g. during betalain thermal treatment, may exhibit greater stability than parent pigments. Moreover, obtained derivatives retain attractive color, making them the promising material for study of pigment stability. An effect of Cu2+ cations as the most degradative metal ions on 2-decarboxy-betanin stability was investigated in ethanolic and methanolic solutions. The increase of the concentration of copper cations has a negative impact on stability of 2-decarboxy-betanin. The cations of Cu (II) in the presence of organic solvents induce the pigment degradation, while the increase of the concentration of organic solvents enhances the pigment decomposition. The main degradation products of the 2-decarboxy-betanin are compounds possessing absorption maxima at λmax ca. 430 nm. These studies allow obtaining the information needed for proper isolation and treatment of pigments, as well as proper storage of products containing betalains.
Źródło:
Challenges of Modern Technology; 2015, 6, 3; 24-29
2082-2863
2353-4419
Pojawia się w:
Challenges of Modern Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mass Spectrometric Detection of New Betalains in Mammillaria Flowers
Autorzy:
Szot, Dominika
Starzak, Karolina
Skopińska, Anna
Wybraniec, Sławomir
Powiązania:
https://bibliotekanauki.pl/articles/1034229.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
Tematy:
Cactaceae
LC-MS
Mammillaria
betacyanins
natural pigments
Opis:
Betacyanins are natural, red-violet betalain pigments which can be found in plenty of plants of the Cactaceae family. The Mammillaria is the widest genus of the Cactaceae family of which fruit was examined for betacyanins contents. As a result of the investigation, a new pigment structure, mammillarinin, was identified. Heretofore, no betacyanins of Mammillaria coronata flowers has been extensively studied. In this report, the results of betacyanin analysis by LC-DAD-ESI-MS/MS in the flower extract are presented.
Źródło:
Zeszyty Naukowe Towarzystwa Doktorantów Uniwersytetu Jagiellońskiego. Nauki Ścisłe; 2015, 10; 189-196
2082-3827
2084-977X
Pojawia się w:
Zeszyty Naukowe Towarzystwa Doktorantów Uniwersytetu Jagiellońskiego. Nauki Ścisłe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Profiles of products generated during betacyanins reduction by 2-methylpyridine borane
Autorzy:
Szot, D.
Starzak, K.
Skopińska, A.
Wybraniec, S.
Powiązania:
https://bibliotekanauki.pl/articles/115550.pdf
Data publikacji:
2015
Wydawca:
Fundacja na Rzecz Młodych Naukowców
Tematy:
betanina
neobetanina
betacyjaniny
redukcja
2-2-metylopirydyna boranu
LC-MS
betanin
neobetanin
betacyanins
reduction
2-methylpyridine borane
Opis:
Betanin and neobetanin (14,15-dehydrogenated betanin), natural betacyanin pigments were subjected to a gentle reduction by 2-methylpyridine borane. During each reduction reaction, the visible spectra were collected. The results were tentatively confirmed by LC-DAD-ESI-MS. In comparison to a previous study with sodium borohydride, various types of products were obtained. Depending on pH, one or two double bonds are reduced. Interestingly, a preliminary decarboxylation of the pigments is also noticed. Betacyanins are plant red-violet pigments applied as colorants in food and pharmaceutical industry which are proven to have an antioxidant activity. They are confirmed to be beneficial for human health as free radical scavengers. Therefore, betacyanins can prevent from many diseases which would be induced by an excessive accumulation of free radicals in the human body. There are more and more reports of their pro-health properties. However, the mechanism of betacyanins oxidation remains not completely elucidated. It is postulated that the rearrangement in the chromophoric system is a significant part of this mechanism. The products obtained as a result of reduction of betanin and neobetanin can be useful in oxidation investigations. Betacyanins with partially destroyed chromophoric system by reduction of the double bonds would by perfect models for further studies on their oxidation.
Źródło:
Challenges of Modern Technology; 2015, 6, 4; 19-22
2082-2863
2353-4419
Pojawia się w:
Challenges of Modern Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of ascorbic acid supplementation on betacyanin stability in purple pitaya (Hylocereus polyrhizus) juice
Autorzy:
Skopińska, A.
Szot, D.
Starzak, K.
Mizrahi, Y.
Wybraniec, S.
Powiązania:
https://bibliotekanauki.pl/articles/115881.pdf
Data publikacji:
2015
Wydawca:
Fundacja na Rzecz Młodych Naukowców
Tematy:
betalains
betacyanins
Hylocereus polyrhizus
thermal treatment of natural pigments
ascorbic acid
betalainy
betacyjaniny
obróbka termiczna naturalnych pigmentów
kwas askorbinowy
Opis:
Current studies on betalains are focused on searching of new plant sources of these pigments. In this light, purple pitaya (Hylocereus polyrhizus) is a valuable batalain-containing fruit. Betalains are known to be sensitive at elevated temperatures conditions. Nevertheless, addition of specific food stabilizers (EDTA, ascorbic acid, citric acid) as well as natural matrix compounds may exert stabilizing effect on maintenance of pigments. Therefore, in presented study, the stability of betalains in Hylocereus polyrhizus juices with protective addition of ascorbic acid at 85 ̊C was examined. Spectrophotometric analyses enable monitoring of reaction during heating of solutions. The hypsochromic shift of λmax to 460 nm is observed in more acidic media without ascorbic acid, suggesting the generation of new reaction products. These absorption bands in solutions with ascorbic acid are not detected, indicating on retaining of the basic structure of betalain chromophore. Generally, pigment retention is diminishing with prolonged heating and depends on pH-values of tested solutions. The addition of ascorbic acid significantly affects the betalain stability. After 60 min of heating, more than 60% of the initial pigment is retained at pH 3-4 in samples of purple pitaya with ascorbic acid. In summary, betacyanins in purple pitaya juice are shown to exhibit proper heat stability, when are stabilized with ascorbic acid. However, a protective effect of natural juice matrix and ascorbic acid is more significant at acidic pH.
Źródło:
Challenges of Modern Technology; 2015, 6, 4; 14-18
2082-2863
2353-4419
Pojawia się w:
Challenges of Modern Technology
Dostawca treści:
Biblioteka Nauki
Artykuł

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