Preferencje help
Polish version English version Język
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 6

Liczba wyników na stronie
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 1 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników

Wyniki wyszukiwania

help Sortuj według:

help Ogranicz wyniki do:
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 1 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
1
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Effect of high hydrostatic pressure on the structure and gelling properties of amylopectin starches

100%
Blaszczak W., Wasserman L. A., Fornal J., Yuryev V. P.
Polish Journal of Food and Nutrition Sciences
|
2007
|
tom 57
|
nr 4
475-480
Waxy maize starch (APM), amylopectin wheat (APW) and amylopectin potato (APP) starches were subjected to high pressure treatment (650 MPa/9 min) in the excess of water. High sensitivity differential scanning microcalorimetry (HSDSC) and 1H-NMR spectroscopy were used to analyse changes in the crystalline structure, gelling and osmotic properties of the pressurized starches. High pressure-treated APM and APW starches demonstrated almost complete gelatinisation of granules (GD=86% and GD=90%, respectively) and significant changes in their crystalline structure (melting of the A-type crystallites). Whereas, the degree of gelatinization of the “pressurised” APP starch accounted for 54%. The measurements of relaxation time constants (T2) of water molecules in pressurized starch gels showed two different relaxations (46–720 ms and 8–120 ms). The complex relaxation of water molecules resulted directly from their different mobility that was triggered by differences in the structure of pressurized starch gels. These differences, i.e. ratio of swollen elements (granule remnants) to the non-swollen elements (crystalline, ordered structures), significantly affected not only the relaxation of water molecules in the gels but also determined their swelling index. The high pressure-treated starches after rehydration formed a gel structure that revealed low values of a swelling index.
2

Interaction of starch polysaccharides and their mixture with water molecules and model lipids. ESR study

100%
Wasserman L. A., Aliev I. O., Yuryev V. P.
Żywność Nauka Technologia Jakość. Suplement
|
2002
|
tom 09
|
nr 4
Electron spin resonance (ESR) was used in order to study interaction of starch polysaccharides (amylose and amylopectin), their mixture and gelatinized potato starch with water molecules and lipids upon cooling. Different spin probes were used, on the one hand spin-labelled stearic acid (5-DSA), which limited lipids, and on the other hand the water soluble probe 4-hydroxy-2,2,6,6-tetramethylpiperidine-1- oxyl (Tempol), which was sensitive to changes in dynamic water phase associated with the temperature- induced polysaccharide gel formation. It was shown that interaction between gelatinized starches and lipids related to mainly on presence of amylose macromolecules in the system. On the other hand, interaction between amylopectin macromolecules and lipids takes place also.
3

The influence of the growth temperature on structural and thermodynamic properties of starches

100%
Yuryev V. P., Genkina N. K., Wasserman L. A.
Żywność Nauka Technologia Jakość. Suplement
|
2002
|
tom 09
|
nr 4
Effects of environmental factors on composition, structure, and physicochemical properties of native starches from different plants have been extensively studied. Among parameters to which attention was paid were environmental factors there is a growth (soil) temperature during plants development (growth temperature) that plays one of the most important role. The application of different physical approaches for a description of the thermodynamic melting parameters of starches allows to determine the cooperative melting unit, the thickness of crystalline lamellae and to evaluate the role of defects in the structural organization of native granules at changes of growth temperature. As example it is considered the influence of growth temperature of plants on the properties of normal potato and sweet potato starches as well as waxy, normal and high-amylose barley starches, i.e. starches with different polymorphous structures of B-, C- and A- types, correspondingly. The nature of calorimetric peaks doubled for some lormal and high-amylose barley starches at a decrease in growth temperature is discussed.
4

Electrophoretic and DSC studies on different wheat starches with various amylose contents

76%
Wasserman L. A., Vaccino P., Boggini G., Schiraldi A., Noda T., Kudryavzev A. M., Yuryev V. P.
Polish Journal of Food and Nutrition Sciences
|
2006
|
tom 15/56
|
nr 1
Granule-bound starch synthase and the structural and thermodynamic properties of the isolated starches were compared using amylopectin (2.1% amylose content), normal (20.5-25.1% amylose content) and high amylose (≥39.5% amylose) wheat cultivars of Japanese, Italian and Russian selections. Amylopectin (2.1% amylose content), normal (20.5-25.1% amylose content) and high amylose (amylose rich containing ≥39.5% amylose) wheat cultivars were investigated using an electrophoretic technique to examine starch-granule bound synthase. High-sensitivity differential scanning microcalorimetry was used to examine the structural and thermodynamic properties of extracted wheat starches. Wx-B1 protein was not present in normal and even in high amylose cultivars except for the normal amylose cultivar Bilancia. An increase in amylose content in starches is generally accompanied by a decrease both in the melting enthalpy and the melting temperatures of crystalline lamella, whilst the polymorphous structure of starches remains invariable (A-type). The melting cooperative unit, the thickness and the surface free energy, enthalpy and entropy of crystalline lamella were also determined. Classification of wheat starches with different amylose contents is offered.
5

Structure and functional properties of wheat bread and pasta produced through supplementation of RS2 and RS3 to wheat flour from traditional Polish and Russian cultivars

76%
Kiseleva V. I., Blaszczak W., Sadowska J., Chernykh V. Y., Artem'eva E., Fornal J., Yuryev V. P.
Polish Journal of Food and Nutrition Sciences
|
2007
|
tom 57
|
nr 2
239-245
Bread and pasta produced from a mixture of common wheat flour and commercial preparations of RS2 and RS3 were investigated. Irrespective of RS types, their addition to flour leads to changes in structure, gel strength, hardness and gumminess of bread crumb. At the same time, an addition of RS does not exert any influence on the elasticity nor cohesiveness. Some features in relaxation behavior of bread samples produced with an addition of RS2 are discussed. In contrast to RS3, the application of RS2 during pasta processing leads to some increase in productivity of pasta extruder, shortening of cooking time, but does not exert any influence on the loss of dry substance during cooking as compared with the control. White bread and pasta containing 7-10% RS are of good organoleptic properties. Extension of storage time of pasta is accompanied by an increase in RS content, which can be reflected in the physiological effect of the dishes based on this type of pasta.
6

Microstructure, thermal properties and susceptibility of the high amylose wheat starch to enzymatic hydrolysis: a new material for resistant starch (RIII) production

64%
Wasserman L. A., Kiseleva V. I., Schiraldi A., Blaszczak W., Fornal J., Sotnikova E. V., Gapparov M. M. G., Yuryev V. P.
Polish Journal of Food and Nutrition Sciences
|
2004
|
tom 13/54
|
nr 2
Differential scanning calorimetry, optical (LM) and scanning electron (SEM) microscopy methods were used for studying the properties and structure of type III resistant starches obtained from high amylose (39.5% amylose) wheat starch. The susceptibility of RSIII starch to enzymatic hydrolysis was also studied. This study has shown that the structure of the investigated, laboratory-obtained preparation was highly influenced by the processing parameters - indicating changes typical of a repeated heating-cooling process. Thermal properties connected with the presence of amylose-lipid complexes, as well as ordered structure fragments in the preparations, were in high accordance to those reported in literature for RSIII preparations from normal wheat, high amylose barley and pea starches as well as commercial types - Novelose 330 or CrystaLean. It was shown that high amylose wheat is a promising raw material for processing bakery and extrusion food products with a reasonably high content of resistant starches without the addition of commercial resistant starches to meal or extrusion mixture.
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 1 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.