| dc.creator | MATSUHIRO,BETTY | |
| dc.creator | TORRES,SIMONET E | |
| dc.creator | GUERRERO,JUAN | |
| dc.date | 2007-03-01 | |
| dc.date.accessioned | 2017-03-07T15:48:04Z | |
| dc.date.available | 2017-03-07T15:48:04Z | |
| dc.identifier | http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072007000100009 | |
| dc.identifier.uri | http://repositorioslatinoamericanos.uchile.cl/handle/2250/391062 | |
| dc.description | Alkaline extraction of Lessonia vadosa blades collected in Fuerte Bulnes (southern Chile) afforded sodium alginate in 14.5% yield. Partial acid hydrolysis of the sodium alginate gave three fractions which were characterised by one- and two-dimensional nuclear magnetic resonance techniques. Fraction 1 (17.8 % yield) showed to be mainly composed of alternate heteropolymeric block (MG) and in minor proportions of polymannuronic sequences. Analysis of 13C NMR and 2D HSQC spectra indicated that Fraction 2 (64.5% yield) is a polymannuronic enriched fraction. The minor amount of guluronic acid residues in this fraction showed by 2D ¹H/¹H NOESY NMR spectrum to be present in a 1→4 homopolyguluronic sequence; moreover, the interresidue correlation data indicated that MG blocks were not present. Results are in agreement with data obtained by FT-IR spectroscopy in the solid state. Full assignments of ¹H and 13C signals in the NMR spectra indicated that Fraction 3 (17.7%) presented a regular homopolyguluronic block structure | |
| dc.format | text/html | |
| dc.language | en | |
| dc.publisher | Sociedad Chilena de Química | |
| dc.source | Journal of the Chilean Chemical Society v.52 n.1 2007 | |
| dc.subject | seaweeds | |
| dc.subject | alginic acid | |
| dc.subject | block composition | |
| dc.subject | Lessonia vadosa | |
| dc.subject | NMR | |
| dc.title | BLOCK STRUCTURE IN ALGINIC ACID FROM LESSONIA VADOSA (LAMINARIALES, PHAEOPHYTA) | |
| dc.type | Artículos de revistas | |
