Preparation of starch ethers using the dry process: carbamoylethyl and cyanoethyl starches and their copolymeric products with acrylamide/acrylonitrile mixture

Hebeish, A.; Waly, A.; Abdel‐Mohdy, F.A.; Aly, A. S.

doi:10.1108/03699429710161688

Cited by 1 publication

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“…Oznaczano trzy pierwiastki: azot, wêgiel i wodór. Na podstawie procentowej zawartooeci azotu okreoelano stopieñ podstawienia (DS) grup karbamoiloetylowych wg wzoru (1) [24]:…”

Section: Analiza Elementarnaunclassified

A new method of poly(aspartic acid) synthesis under microwave radiation

Rupinski¹,

Brzozowski²,

Skwara³

2005

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Streszczenie-Opisano dwie metody syntezy karbamoiloetylowanych pochodnych skrobi (CrES) obejmuj¹ce etapy degradacji (chemicznej b¹dŸ enzymatycznej pod wp³ywem α-amylazy) oraz etap reakcji addycji z akryloamidem. Zbadano wp³yw warunków degradacji enzymatycznej (biodegradacji) na rozpuszczalnooeae w wodzie CrES, lepkooeae jej roztworów wodnych, stopieñ podstawienia (DS) i ciê¿ar cz¹steczkowy. Scharakteryzowano wp³yw opisanej modyfikacji skrobi na zmiany struktury jej powierzchni. S³owa kluczowe: skrobia, karbamoiloetylowanie, stopieñ podstawienia, degradacja enzymatyczna, α-amylaza, rozpuszczalnooeae w wodzie, ciê¿ar cz¹steczkowy, struktura powierzchni. WATER-SOLUBLE CARBAMOYLETHYLATED DERIVATIVES OF POTATO STARCH. PART I. SYNTHESIS AND STRUCTURE Summary-Water-soluble starch derivatives (CrES) containing carbamoylethyl groups were synthesized using two methods. The first based on chemical degradation of native potato starch under the influence of KOH or NaOH and subsequent reaction of addition with acryloamide. The other based on carbamoylethylation of native starch in such reaction and subsequent enzymatic biodegradation of CrES obtained using α-amylase. The effects of biodegradation conditions, namely: catalyst type and concentration [Ca(OH)2, KOH], time and temperature of the process and α-amylase concentration on CrES solubility in the water and viscosity of aqueous solutions obtained (Table 1 and 6) as well as on the degree of substitution (DS, Table 2-5). The lowering of molecular weight of starch products after degradation, either chemical or enzymatic one, positively influences the solubility of CrES in water (results of MALDI-TOF measurements, Fig. 1, 2 and 6). The modification causes also the changes in the surface structure of CrES facilitating its dissolution in water (results of SEM microscopic investigations, Fig. 3 and 7). Chemical structure of CrES was confirmed by FT-IR method (Fig. 4, 5 and 8).

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“…Oznaczano trzy pierwiastki: azot, wêgiel i wodór. Na podstawie procentowej zawartooeci azotu okreoelano stopieñ podstawienia (DS) grup karbamoiloetylowych wg wzoru (1) [24]:…”

Section: Analiza Elementarnaunclassified

A new method of poly(aspartic acid) synthesis under microwave radiation

Rupinski¹,

Brzozowski²,

Skwara³

2005

Polimery

View full text Add to dashboard Cite

show abstract

Preparation of starch ethers using the dry process: carbamoylethyl and cyanoethyl starches and their copolymeric products with acrylamide/acrylonitrile mixture

Cited by 1 publication

References 11 publications

A new method of poly(aspartic acid) synthesis under microwave radiation

A new method of poly(aspartic acid) synthesis under microwave radiation

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