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Humayun S, Premarathna AD, Rjabovs V, Howlader MM, Darko CNS, Mok IK, Tuvikene R. Biochemical Characteristics and Potential Biomedical Applications of Hydrolyzed Carrageenans. Mar Drugs 2023; 21:md21050269. [PMID: 37233463 DOI: 10.3390/md21050269] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2023] [Revised: 03/06/2023] [Accepted: 03/07/2023] [Indexed: 05/27/2023] Open
Abstract
Seaweed contains a variety of bioactive compounds; the most abundant of them are polysaccharides, which have significant biological and chemical importance. Although algal polysaccharides, especially the sulfated polysaccharides, have great potential in the pharmaceutical, medical and cosmeceutical sectors, the large molecular size often limits their industrial applications. The current study aims to determine the bioactivities of degraded red algal polysaccharides by several in vitro experiments. The molecular weight was determined by size-exclusion chromatography (SEC), and the structure was confirmed by FTIR and NMR. In comparison to the original furcellaran, the furcellaran with lower molecular weight had higher OH scavenging activities. The reduction in molecular weight of the sulfated polysaccharides resulted in a significant decrease in anticoagulant activities. Tyrosinase inhibition improved 2.5 times for hydrolyzed furcellaran. The alamarBlue assay was used to determine the effects of different Mw of furcellaran, κ-carrageenan and ι-carrageenan on the cell viability of RAW264.7, HDF and HaCaT cell lines. It was found that hydrolyzed κ-carrageenan and ι-carrageenan enhanced cell proliferation and improved wound healing, whereas hydrolyzed furcellaran did not affect cell proliferation in any of the cell lines. Nitric oxide (NO) production decreased sequentially as the Mw of the polysaccharides decreased, which indicates that hydrolyzed κ-Carrageenan, ι-carrageenan and furcellaran have the potential to treat inflammatory disease. These findings suggested that the bioactivities of polysaccharides were highly dependent on their Mw, and the hydrolyzed carrageenans could be used in new drug development as well as cosmeceutical applications.
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Affiliation(s)
- Sanjida Humayun
- School of Natural Sciences and Health, Tallinn University, Narva mnt 29, 10120 Tallinn, Estonia
| | - Amal D Premarathna
- School of Natural Sciences and Health, Tallinn University, Narva mnt 29, 10120 Tallinn, Estonia
| | - Vitalijs Rjabovs
- National Institute of Chemical Physics and Biophysics, Akadeemia tee 23, 12618 Tallinn, Estonia
- Institute of Technology of Organic Chemistry, Riga Technical University, P. Valdena Str. 3, LV-1048 Riga, Latvia
| | - Md Musa Howlader
- School of Natural Sciences and Health, Tallinn University, Narva mnt 29, 10120 Tallinn, Estonia
| | | | - Il-Kyoon Mok
- Green-bio Research Facility Center, Institutes of Green Bio Science & Technology, Seoul National University, Pyeongchang-gun 25354, Gangwon-do, Republic of Korea
| | - Rando Tuvikene
- School of Natural Sciences and Health, Tallinn University, Narva mnt 29, 10120 Tallinn, Estonia
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Premarathna AD, Tuvikene R, Fernando PHP, Adhikari R, Perera MCN, Ranahewa TH, Howlader MM, Wangchuk P, Jayasooriya AP, Rajapakse RPVJ. Comparative analysis of proximate compositions, mineral and functional chemical groups of 15 different seaweed species. Sci Rep 2022; 12:19610. [PMID: 36380074 PMCID: PMC9666456 DOI: 10.1038/s41598-022-23609-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2022] [Accepted: 11/02/2022] [Indexed: 11/16/2022] Open
Abstract
Seaweed is a popular edible source and is associated with many foods and pharmaceutical industries around the world. The current research aims to provide information on the chemical composition of 15 seaweed species, consisted of Chlorophyta, Ochrophyta/Phaeophyceae, and Rhodophyta macroalgae, collected from coastal areas of Sri Lanka. Seaweed samples were subjected to the analysis of lipids, proteins, ash and macro, micro, trace and ultra-trace elements. The highest protein content was recorded in the brown algae. Maximum dietary fiber and ash contents were recorded from green algae. The highest predominant fatty acids were observed from green seaweeds (Caulerpa racemosa); however, linoleic acid (C18:2n6) is the dominant fatty acid of all macroalgae. Mineral contents were highest in the red macroalga; however, copper, zinc and magnesium were also comparatively higher in green alga Ulva lactuca. In conclusion, 15 seaweed species belonging to the three different classes of seaweeds are investigated in details to obtain their biochemical, mineral and fatty acid compositions for the synthesis of novel therapeutic agents. In order to explore biorefinery processes for these seaweeds, as well as how they can potentially be cultivated, more extensive studies are required. Studying and determining the nutritional values of seaweeds will be beneficial with the potentials for future industrial uses and research.
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Affiliation(s)
- Amal D Premarathna
- School of Natural Sciences and Health, Tallinn University, Narva mnt 29, 10120, Tallinn, Estonia.
- Department of Veterinary Pathobiology, Faculty of Veterinary Medicine and Animal Science, University of Peradeniya, Peradeniya, Sri Lanka.
| | - Rando Tuvikene
- School of Natural Sciences and Health, Tallinn University, Narva mnt 29, 10120, Tallinn, Estonia.
| | - P H P Fernando
- Department of Biochemistry, Faculty of Medicine, University of Peradeniya, Peradeniya, Sri Lanka
| | - Ranjith Adhikari
- National Serpentarium, South Asian Clinical Toxicology Research Collaboration, Faculty of Medicine, University of Peradeniya, Peradeniya, Sri Lanka
| | - M C N Perera
- Department of Biochemistry, Faculty of Medicine, University of Peradeniya, Peradeniya, Sri Lanka
| | - T H Ranahewa
- Department of Veterinary Pathobiology, Faculty of Veterinary Medicine and Animal Science, University of Peradeniya, Peradeniya, Sri Lanka
| | - Md Musa Howlader
- School of Natural Sciences and Health, Tallinn University, Narva mnt 29, 10120, Tallinn, Estonia
| | - Phurpa Wangchuk
- Centre for Molecular Therapeutics, Australian Institute of Tropical Health and Medicine, James Cook University, Smithfield, QLD, 4878, Australia
| | - Anura P Jayasooriya
- Department of Basic Veterinary Sciences, Faculty of Veterinary Medicine and Animal Science, University of Peradeniya, Peradeniya, Sri Lanka
| | - R P V J Rajapakse
- Department of Veterinary Pathobiology, Faculty of Veterinary Medicine and Animal Science, University of Peradeniya, Peradeniya, Sri Lanka.
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Azzam RM, Howlader MM. Fourth- and sixth-order polarization aberrations of antireflection-coated optical surfaces. Opt Lett 2001; 26:1607-1608. [PMID: 18049678 DOI: 10.1364/ol.26.001607] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
For single-layer antireflection-coated (ARC) optical surfaces, the first five derivatives of reflectance with respect to angle of incidence phi for the p and s polarizations are zero at normal incidence, whereas the first three derivatives of differential transmission phase shift D(t)(= D(tp)-D(ts)) with respect to phi are also zero at phi=0 . Consequently, ARC optical systems with numerical apertures of <0.7(phi<45 degrees ) exhibit fourth- and sixth-order polarization aberrations owing to retardance and diattenuation, respectively. Results for ARC Ge and ZnS surfaces are presented to illustrate these effects.
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