Academia.edu no longer supports Internet Explorer.
To browse Academia.edu and the wider internet faster and more securely, please take a few seconds to upgrade your browser.
1977, Botanica Marina
Journal of Applied Phycology
A comparative analysis of phycocolloids produced by underutilized versus industrially utilized carrageenophytes (Gigartinales, Rhodophyta)2009 •
Carrageenan (E-407) and semi-refined carrageenan (E-407a) are some of the main additives used by the food industry for their gelling, emulsifying, thickening, and stabilizing properties. These are natural ingredients, which have been used for decades in food applications and are generally regarded as safe. Internationally, sub-tropical carrageenophytes (e.g., Kappaphycus alvarezii) are cultivated extensively as a source of raw materials for industrial extraction, and their use as potential candidates in integrated multitrophic aquaculture is tentative. We analyzed carrageenan yield (as a percentage of dry weight) and chemical composition (by Fourier transform infrared attenuated total reflection and Fourier transform-Raman) of extracts produced by several carrageenophytes (Gigartinales, Rhodophyta), from different origins, e.g., K. alvarezii (Tanzania, Indonesia, the Philippines, Panama, and Mexico), Kappaphycus striatum (Madagascar), Eucheuma denticulatum (Tanzania, the Philippines, and Madagascar), Betaphycus gelatinum (the Philippines), Chondracanthus chamissoi, and Sarcothalia crispata (Chile). For comparison, some underutilized carrageenophytes were also analyzed, e.g., Chondrus crispus, Mastocarpus stellatus, Gigartina pistillata, Chondracanthus teedei var. lusitanicus, Chondracanthus acicularis, Calliblepharis jubata, Gymnogongrus crenulatus, and Ahnfeltiopsis devoniensis (Portuguese carrageenophytes). The main findings were that the highest carrageenan yield was obtained from K. striatum (Madagascar) with 75.6 (percent dry weight (% DW)); B. gelatinum and K. alvarezii (both from the Philippines) had yields of 71.0% and 68.0% (% DW), respectively; and G. pistillata (Portugal) 65.4% (% DW). Spectroscopic analysis of the phycocolloids allowed determination of a wide range of carrageenan types, e.g., pure iota carrageenan, several kappa–iota hybrid carrageenans with different iota/kappa ratios, and kappa–beta, xi–theta, and xi–lambda hybrid carrageenans.
Carbohydrate Polymers
Chemical and rheological characterization of the carrageenans from Hypnea musciformis (Wulfen) Lamoroux2014 •
Increasing worldwide demand and development of new applications of carrageenan have added urgency to the search for new or additional raw material sources. Native and alkali-treated carrageenan from Halymenia floresii from Yucatán was extracted and preliminarily characterized. Results showed that this species contains a highly sulfated carrageenan, with minor amounts of 3,6-anhydro-galactose. Native sulfated galactan seems to be rheologically and chemically similar to the lambda-family carrageenan with appropriate thickening ability for food applications. Further studies are needed to precisely define the structure of these complex polymers and its potential use as a source of industrial lambda family.
Carbohydrate Polymers
Portuguese carrageenophytes: Carrageenan composition and geographic distribution of eight species (Gigartinales, Rhodophyta)2011 •
Eight carrageenophytes from the Centre and North coast of Portugal, representing seven genera and three families of Gigartinales, were studied in 15 different coastal stations in a geographic study, from Baleal (Peniche), in the central zone, to Moledo, in the northern zone.In order to characterize the different carrageenan types, 1H NMR spectroscopy was used to identify and quantify the different carrageenan fractions in the extracted phycocolloids (both water and alkali extractions). Thereby, detailed information concerning the properties and structure of these polysaccharides at molecular level was revealed.Based on the results of the analysis of the carrageenan types, the following conclusions were made: female gametophytes and non-fertile thalli of Chondrus crispus, Mastocarpus stellatus, Chondracanthus teedei var. lusitanicus, Gigartina pistillata, Chondracanthus acicularis and Gymnogongrus crenulatus, presented a varying degrees of kappa–iota hybrid carrageenan (co-polymers of kappa–iota carrageenan). The kappa/iota ratio ranged from 0 to 2.2. The carrageenans extracted from Ahnfeltiopsis devoniensis were mainly iota-carrageenan, but some geographic variations in the composition of carrageenans were found. Calliblepharis jubata contained carrageenans of iota-type in all reproductive stages. Lambda-family carrageenans were found in tetrasporophytes of C. cripus (lambda), M. stellatus (lambda), C. teedei var. lusitanicus (hybrid xi–theta), C. acicularis (hybrid xi–theta) and G. pistillata (hybrid xi–lambda).
Journal of Information and Computational Science
Micromorphological and Biochemical Studies of Laurencia obtusa (Hudson) Lamouroux (Ceramiales) of Rhodophyceae2020 •
Thallus of Laurencia obtusa of Rhodophyceae was studied and detailed micromorphological evaluation was done. Morphology of the thallus has been studied to aid pharmacognostic and phytochemical evidences to aid in taxonomic species identification. Parameters presented in this paper may be proposed to establish the authenticity of this red alga and can possibly help to differentiate this alga from its other species. Since the collections were made in the month of March, Laurencia was with few gametophytic thalli. The study revealed several interesting anatomical characters and its cellular details. Phytochemical screening reveal the presence of tannin, saponin and flavonoids. These features both anatomy and phytochemistry clearly help in identification of this plant.
The Scientific World Journal
Population studies and carrageenan properties in eight Gigartinales (Rhodophyta) from Western Coast of Portugal2013 •
Carbohydrate Research
The potassium chloride-soluble carrageenans of the red seaweed Iridaea undulosa B1986 •
Ciencias Marinas
Characterization of the carrageenan of Chondracanthus pectinatus (Rhodophyta: Gigartinales)Journal of Applied Phycology
Population studies and carrageenan properties of Chondracanthus teedei var. lusitanicus (Gigartinaceae, Rhodophyta)2004 •
Features of an intertidal population of Chondracanthus teedei var. lusitanicus, which occurs in sandy basins on rocky shores of part of the Portuguese coast (Buarcos, Figueira da Foz), were studied over one year. Biomass and plant size showed a small increase in early spring (April), a marked increase in early summer (June/July) and were at a minimum in late summer. There was generally more tetrasporophytes (4–32.5%) than female gametophytes (3–29%), which contrasts with other geographical regions where C. teedei populations have been studied, such as Brazil and France. However, non-fructified thalli predominated throughout the year. Phycocolloid extracts were compared for the various stages using spectroscopic methods (FTIR, FT-Raman, 1H- and 13C-NMR). These showed a hybrid carrageenan belonging to the lambda family in the tetrasporophyte and a hybrid kappa-iota-mu-nu carrageenan in the female gametophyte and non-fructified thalli. The average phycocolloid content was 34.9% dry weight, with a maximum of 43.6% in July. The combination of high available biomass and phycocolloid content makes this species a potentially important source of kappa/iota hybrid carrageenan in Portugal additional to the traditionally harvested carrageenophytes.
The main isolation procedures (extraction, alkali modification, and precipitation) of hybrid carrageenan blend from seaweeds of the Kassari algal stratum (the Baltic Sea, Estonia) were quantitatively investigated. In the case of all extracting agents (water, KOH and NaOH solutions) used, a sharp rise occurred in the extracting rate during the first 2 h. Pure water was the most efficient extracting medium for carrageenans from the biomass of Furcellaria lumbricalis-Coccotylus truncatus with regard to yield but certainly not gelling properties (gel strength) of polysaccharides extracted. Long-time alkali extraction causes great losses due to degradation of carrageenans; however, alkali treatment is an obligatory step for the isolation of high-quality gelling galactans from the Kassari algal stratum, resulting in a more than 3-fold increase in gel strength. In the case of a typical algal blend from this stratum (69% F. lumbricalis and 10% C. truncatus), the most effective medium for th...
Agricultural Science Digest - A Research Journal
Effects of nematode infection on contents of phenolic substances as influenced by root-knot nematode,Meloidogyne incognitain susceptible and resistant brinjal cultivarsThe Journal of Immunology
Augmentation of RANTES-Induced Extracellular Signal-Regulated Kinase Mediated Signaling and T Cell Adhesion by Elastase-Treated Fibronectin2001 •
International Journal of Molecular Sciences
Cellular Model of Malignant Transformation of Primary Human Astrocytes Induced by Deadhesion/Readhesion CyclesRevista Controversia
El surgimiento y apuntalamiento de grupos paramilitares2004 •
Biochimica et Biophysica Acta (BBA) - Molecular Basis of Disease
Synthesis of adenine and guanine nucleotides at the ‘inosinic branch point’ in lymphocytes of leukemia patients1999 •
2015 •
The Journal of General Physiology
A Conducting State with Properties of a Slow Inactivated State in a Shaker K+ Channel Mutant2001 •
International Dairy Journal
Differences in volatiles, and chemical, microbial and sensory characteristics between artisanal and industrial Piacentinu Ennese cheeses2005 •
Foods and Raw Materials
Determination of Physicochemical, Immunochemical and Antioxidant Properties, Toxicological and Hygienic Assessment of Whey Protein Comcentrate and Its Hydrolysate2015 •
2019 •
Journal of Family Issues
The “Good Enough” Parent: Perfectionism and Relationship Satisfaction Among Parents and Nonparents2018 •
2014 •
Sleep and Breathing
The relationship between cephalometric carotid artery calcification and Framingham Risk Score profile in patients with obstructive sleep apnea2012 •
TrAC Trends in Analytical Chemistry
Effect-based and chemical analytical methods to monitor estrogens under the European Water Framework Directive2018 •
Sau Sinh Bị ê Buốt Răng Và Những Điều Cần Biết
Sau Sinh Bị ê Buốt Răng Và Những Điều Cần Biết2024 •
Musamus Journal of Technologi and Information
Sistem Pemesanan Rumah Sewa Pada Kabupaten Merauke Berbasis Web2018 •
Journal of Colloid and Interface Science
Physicochemical Properties of Dodecylammonium Picrate2000 •
Journal for the Study of the Pseudepigrapha
Demonstratio et veritas. Priestly oracles in Pseudo-Philo's Liber Antiquitatum Biblicarum2024 •
Filozofia Publiczna i Edukacja Demokratyczna
The Interpreter of untranslatable: A tribute to Janek Karłowski (1962-2017)2018 •