¹³C‐NMR study of Dipteryx Alata Vogel starch

Abstract

Natural starches obtained by fruit seeds have been a subject of studies because of their applications, as a consequence of their chemical properties. As it is known, the fruits depend on the geographic region. Because of this, several factors affect the seed starches nature, such as granules size, morphology, components, and composition. Thus, to better understand starch properties, it is necessary to investigate the chemical behavior of these factors. This work focused on the chemical components and molecular dynamic behavior of the Dipterxy Alata Vogel (cumbaru) starch, because this fruit is very popular and is used in abundance for people because they think that it is good for some kinds of diseases. The main chemical components and the molecular dynamics of starch from the Dipterxy Alata Vogel were studied by applying solid-state 13 C nuclear magnetic resonance spectroscopy (NMR).

Caracterização de diferentes amostras de mandioca por espectroscopia de ressonância magnética nuclear

“…A primeira localizada aproximadamente entre 63 e 67 ppm está relacionada aos grupamentos CH 2 -OH (C-6); uma outra faixa entre 70 e 84 ppm aproximadamente representa os grupos CH-O (C-2, C-3, C-4 e C-5), e por fim a faixa localizada aproximadamente entre 94 e 107 ppm é referente ao grupamento C-O-C dos carbonos anoméricos (C-1) [9,[14][15][16] . O espectro de 13 C da amostra F4 apresentou, além das três faixas de sinais mencionadas para as demais amostras, uma outra faixa de sinais entre 19,4 e 25,3 ppm.…”

Complexation of Fe(III) with water‐soluble oxidized starch

“…Even with the 0.65:1 AGU-to-Fe(III) molar ratio the iron was completely soluble indicating that one AGU effectively binds 1.5 Fe(III) ion and keeps it in solution. Polynuclear Fe(III) species have been reported to form with polysaccharides containing SO 4 À and COO À groups and the stability of the complex depended on the molecular weight of the polymer [18]. Without OS, the Fe(III) was highly insoluble at pH 8.5 and its solution was colorless with a reddish precipitation.…”

“…(mol/L) 4 ) [11]. The adsorption mechanism and interaction between Fe(III) and starch or other carbohydrates containing variable functionalities have been intensively studied for years [8,[12][13][14][15][16][17][18][19][20][21].…”

“…Starch has a granular structure [4], which consists of linear amylose and branched amylopectin [5] structured from anhydroglucose units (AGUs). Three hydroxyl groups in AGU can turn to one side of the ring making it more hydrophilic.…”

Solid State NMR Study ofCouma utilisSeeds

“…Nuclear magnetic resonance (NMR) is one of the best spectroscopies to be used to analyze the sample in nature, applying solid state techniques [3][4][5][6][7][8][9][10][11][12]. 1 H and 13 C High resolution NMR spectroscopy are the most important nuclei applied to plant seeds because it is a nondestructive analysis, and permits to evaluate the seeds' molecular behavior.…”