A simple 1H NMR method for the quantification of carrageenans in blends

Spatial and temporal variations of Chondrus crispus (Gigartinaceae, Rhodophyta) carrageenan content in natural populations from Galicia (NW Spain)

“…The dominant fractions were κ-and ι-carrageenan (more than 85% of the total carrageenans). Carrageenan fractions present in tetrasporophytes could not be determined by 1 HNMR, although the results of FTIR analysis confirmed the presence of λ-carrageenan as observed by different authors (McCandless et al 1983;Correa-Diaz et al 1990;Pereira and Mesquita 2003;Tojo and Prado 2003a). Spatial and temporal variations on qualitative and quantitative carrageenan content in both phases may be Fig.…”

Functions of iota-carrageenan on the gelatinization and retrogradation behaviors of corn starch in the presence or absence of various salts

“…As physicochemical characteristics of iota-carrageenan, contents of iota fractions and cations in the sample were determined by 1 H nuclear magnetic resonance spectroscopy (Tojo & Prado, 2003) and inductively coupled plasma-optical emission, respectively, in the same manner as reported previously (Funami, Hiroe, et al, 2007). As macromolecular characteristics of iota-carrageenan, weight-average molecular weight M w , z-average rootmean-square radius of gyration R g , and polydispersity index were determined by SEC-MALS, and the intrinsic viscosity [Z] was measured by capillary viscometry in the same manner as reported previously (Funami, Hiroe, et al, 2007).…”

Molecular mobility and microscopic structure changes in κ-carrageenan solutions studied by gradient NMR

“…The corresponding signals are indicated by p and , respectively. Detailed information on the signal assignments of pullulan and -carrageenan can be found in the literature (Mclntyre & Calgary, 1993;Tojo & Prado, 2003). The water peak at 4.7 ppm was completely eliminated due to the fast diffusion of water.…”