Infrared analysis of eleven carrageenophytes from Baja California, Mexico

Correa-Díaz, Felipe; Aguilar-Rosas, Raúl; Aguilar-Rosas, Luis E.

doi:10.1007/bf00040295

Cited by 28 publications

(16 citation statements)

References 7 publications

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“…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.…”

Section: Discussionmentioning

confidence: 51%

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

2011

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Qualitative and quantitative differences in carrageenan composition of gametophytes and tetrasporophytes of Chondrus crispus were observed in this study. Carrageenans in gametophytes belong to the kappa family (κ-, ι-, ν-and μ-carrageenan). The dominant fractions were κ-and ι-carrageenan (more than 50% of the total carrageenans). In tetrasporophytes, the presence of λ-carrageenan was confirmed. Carrageenan content in gametophytes (37.4±1.68% DW) was higher than in tetrasporophytes (29.13±0.76% DW). Spatial and temporal variation in carrageenan content in both life cycle phases appears to be related mainly to seawater and air temperatures, insolation, water movement and desiccation. The highest values of carrageenan content were recorded in those localities where higher values of precipitation, wind speed or water movement occurred. A bimodal temporal pattern on carrageenan content was observed. Fronds showed a high carrageenan content in spring and autumn. During these seasons, the content was over 40% in gametophytes and 30% in the tetrasporophytes. In summer and winter, these values down in both life cycle phases below 30%. In general the highest carrageenan contents were related to highest seawater temperatures. On the contrary, high air temperature and high insolation appeared to be unfavourable for carrageenan production. GLM models were obtained to predict carrageenan production from natural C. crispus populations, along Galician coast.

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Section: Discussionmentioning

confidence: 51%

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

2011

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“…5) present broad absorption bands in 820 Á/830 cm (1 region, characteristic of the lcarrageenan [5,6]. The FT-Raman spectra of these samples present a broad peak in 820 cm (1 (Fig.…”

Section: Resultsmentioning

confidence: 91%

“…1) present strong absorption bands in 930 cm (1 region (3,6-anhydro-D-galactose) and in the 845 cm (1 region (D-galactose-4-sulphate), typical of k-carrageenan. They present lower absorbance in the 805 cm (1 region (3,6-anhydro-D-galactose-2-sulphate), which indicates a presence of low quantities of i-carrageenan [5,6]. The ratio between 805 and 845 cm (1 absorption bands was calculated [5,7] and used as parameter to determine the degree of the kÁ/i hybridisation (Figs.…”

Section: Resultsmentioning

confidence: 99%

Carrageenophytes of occidental Portuguese coast: 1-spectroscopic analysis in eight carrageenophytes from Buarcos bay

Pereira

Mesquita

2003

Biomolecular Engineering

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Infrared and Raman spectroscopic analysis of the carrageenan (alkaline extraction) in eight species (representing seven genera and four families) of Gigartinales, in different reproductive phases from Buarcos bay (Figueira da Foz, Portugal), were studied. Female gametophytes and non-fertile thalli samples of Chondrus crispus , Mastocarpus stellatus , Chondracanthus teedei var. lusitanicus , Gigartina pistillata and Chondracanthus acicularis present a k-carrageenan profile or varying degrees of a k Á/i hybrid. The presence of k Á/i hybrid carrageenan in C. teedei var. lusitanicus was confirmed by 13 C NMR. The carrageenans extracted from Gymnogongrus crenulatus and Ahnfeltiopsis devoniensis are constituted mainly by i-carrageenan but seasonal variations in the nature of carrageenans are present. l-Family carrageenans were found in tetrasporophytes of C. crispus , M. stellatus , C. teedei var. lusitanicus , C. acicularis and G. pistillata . Calliblepharis jubata presents carrageenans of i-type in all reproductive stages. #

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“…The polysaccharide from tetrasporic M. laminarioides showed a galactose/3,6-anhydrogalactose/ sulfate molar ratio of 1:0.1:1.1. The presence of 3,6-anhydrogalactose in significant amount is not so unusual in carrageenans from tetrasporic carrageenophytes (Correa-Díaz et al 1990;Furneaux 1995, 1998;López-Acuña, et al 2002). On the other hand, the molar ratio showed lower sulfate content in relation to idealized λ-carrageenan (1.0:0.0:1.5); this fact may be due to the undersulfation at position C-6 of α-galactopyranosyl residues as found in the carrageenan from tetrasporic Chondrus crispus (Matsuhiro and Urzúa 1992).…”

Section: Discussionmentioning

confidence: 89%

Carrageenans from nuclear phases of subantartic Mazzaella laminarioides (Gigartinales, Rhodophyta) and graft copolymerization of alkali-modified carrageenan with acrylamide

et al. 2015

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Aqueous extraction of cystocarpic, tetrasporic, and vegetative individuals of Mazzaella laminariodes collected in the Magellan Ecoregion, Southern Chile, afforded sulfated galactans. Analysis by Fourier transform infrared spectroscopy (FT-IR) and by 1 H and 13 C NMR spectroscopy indicated that purified extracts from cystocarpic (CP) and vegetative individuals (VP) were mixtures of κ/ι-type carrageenans and their precursors μ-and ν-carrageenans, whereas the aqueous extract from tetrasporic individuals was a λ-type carrageenan. Alkaline treatment of CP and VP polysaccharides produced modified polysaccharides with lower content of sulfate groups and with a concomitant increase of 3,6-anhydrogalactose content; analysis by 2D 1 H and 13 C NMR indicated the presence of hybrid κ-ι-carrageenans. Copolymerization of alkalitreated CP carrageenan with acrylamide was achieved by using ceric ammonium nitrate as the initiator; studies by NMR spectroscopy indicated grafting of polyacrylamide at position C-6 of β-galactopyranosyl residues. Reaction of modified CP with acrylamide assisted by microwave irradiation in the presence of ammonium persulfate afforded a copolymer grafted at position C-2 of β-galactopyranosyl residues.

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Infrared analysis of eleven carrageenophytes from Baja California, Mexico

Cited by 28 publications

References 7 publications

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

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

Carrageenophytes of occidental Portuguese coast: 1-spectroscopic analysis in eight carrageenophytes from Buarcos bay

Carrageenans from nuclear phases of subantartic Mazzaella laminarioides (Gigartinales, Rhodophyta) and graft copolymerization of alkali-modified carrageenan with acrylamide

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