Analysis Of Phytochemicals And Antioxidents From Red Seaweeds(Halyminiya Dilate And Liagora Albicance) Collected From Rameswaram, Tamil Nadu

Seaweeds are marine macroscopic algae which form an important components of marine living organism. This study was carried out to detect presence of some secondary metabolites that they have the secondary metabolites like phytochemicals have been extensively investigated as a source of medicinal agents seaweeds are becoming a viable source of biologically active composites with a hopeful application as nutraceuticals, functional food components. Natural products from marine algae have attracted the attention of biologists and chemists the world over for the last five year The aim of present study was to perform the qualitative and quantitative phytochemical analysis of redMETHODS: seaweed Halymiya dilate and Liagora albicance. DPPH Radical scavenging and cytotoxicity screening were carried out in methanol extract of 2 macro algae as per standard methods with few modifications Among the 2RESULT seaweeds, H.dilata showed the maximum number of active constituents in the methanol extract Likewise. H.dilata showed maximum number of compounds in petroleum ether and methanol. L.albicance showed the maximum number of compounds acetone and methanol. The methonal extract showed the highest radical scavenging activity(IC 50 VALUE ) was methanol extract when tested by DPPH in both H.dilata and L.albicance

Hexadecanoic acid-enriched extract of Halymenia durvillei induces apoptotic and autophagic death of human triple-negative breast cancer cells by upregulating ER stress

Objective: To investigate the effect of the hexane solvent fraction of Halymenia durvillei (HDHE) on triple-negative breast cancer. Methods: The phytochemical profile of HDHE was investigated by GC-MS. The cytotoxicity of HDHE against MDA-MB-231 cells was determined. The apoptotic and autophagic effects of HDHE were analyzed. The expression of molecular markers controlling apoptosis, autophagy, DNA damage, and endoplasmic reticulum (ER) stress was determined. Results: HDHE contains a mixture of fatty acids, mainly hexadecanoic acid. HDHE at a cytotoxic concentration induced apoptotic death of MDA-MB-231 cells through mitochondrial membrane dysfunction, and induction of apoptosis markers, and increased the expression of proteins related to DNA damage response. HDHE also induced the expression of LC-3, a marker of autophagic cell death at a cytotoxic concentration. Moreover, HDHE modulated the expression of ER stress genes. Conclusions: The hexadecanoic acid-enriched extract of Halymenia durvillei promotes apoptosis and autophagy of human triple-negative breast cancer cells. This extract may be further explored as an anticancer agent for triple-negative breast cancer.

Biopeptides of Pyropia yezoensis and their potential health benefits: A review

Pyropia yezoensis (P. yezoensis) is a popular species of red algae that are commercially cultivated and consumed in East Asia, China, Japan, and Korea. The high protein content of P. yezoensis provides a source of multiple bioactive peptides exhibiting antioxidant, anti-inflammatory, antihypertensive, anticancer, tissue healing, immunomodulatory, and anticoagulant properties. Furthermore, many other biologically active substances in P. yezoensis, including carbohydrates, lipids, dietary fibers, and polyphenols, have shown potential health benefits and are important in both the food and agriculture industries. This review provides a detailed summary of researches over the last decade on the biological and medicinal properties of bioactive peptides. The information was extracted from various electronic resources, including Google Scholar, PubMed, MEDLINE, and Google Patents.

Gracilaria fisheri oligosaccharides ameliorate inflammation and colonic epithelial barrier dysfunction in mice with acetic acid-induced colitis

Objective: To investigate the effect of Gracilaria fisheri oligosaccharides (GFO) on inflammation and colonic epithelial barrier dysfunction in colitis mice. Methods: The animals were treated by oral gavage with distilled water, 1 000 mg/kg inulin, 100, 500, or 1 000 mg/kg GFO for 14 d, or treated with 50 mg/kg mesalamine for 5 d after colitis induction (on day 10). Histopathology, inflammatory cytokines, colonic permeability, and tight junction proteins were investigated by hematoxylin and eosin staining, immunohistochemical staining, Ussing chamber technique, and Western blotting assays, respectively. Results: GFO ameliorated histological damage in colitis mice when compared to untreated colitis mice. Treatments with 100, 500, and 1 000 mg/kg GFO reduced TNF-α expression, while IL-1β was significantly reduced in colitis mice treated with 500 and 1 000 mg/kg. Compared to untreated colitis mice, GFO increased transepithelial electrical resistance, reduced fluorescein isothiocyanate-dextran paracellular flux, and modulated tight junction proteins (occludin and claudin 2) in colitis mice. Conclusions: GFO has anti-inflammatory activity and could modulate colonic epithelial barrier dysfunction in acetic acid-induced colitis mice. Furthermore, GFO could modulate the expression of tight junction proteins that play important roles in colonic barrier function.

Bioassay guided purification of cytotoxic natural products from a red alga Dichotomaria obtusata

ABSTRACT Different solvent extracts of Dichotomaria obtusata (J. Ellis & Solander) Lamark, Galaxauraceae, a red algae collected from the coast of Bushehr in the Persain Gulf, was investigated for its cytotoxic properties and chemical constituents. The fresh alga, after extraction with methanol and dichloromethane were combined and partitioned between water, dichloromethane and ethyl acetate. The above fractions were then tested against MOLT-4 (human lymphoblastic leukemia) cancer cell line. The IC50 values of the dichloromethane and ethyl acetate layers of the crude extract were 29.8 ± 3.1 and 30.6 ± 7.9 µg/ml against MOLT-4 cells, respectively, while the water layer showed a week activity with IC50 > 50 µg/ml. After fractionation of the active extracts using open column chromatography over silica gel and preparative thin layer chromatography purification, two terpenoid derived compounds, trans-phytol palmitate and γ-tocopherol were isolated from the dichloromethane and ethyl acetate extracts. The structures of the compounds were elucidated using different spectral data including 1H NMR, 13C NMR, HSQC, HMBC and EI-MS. The IC50 values of compounds trans-phytol palmitate, γ-tocopherol and an undetermined mixture of compounds (F-13-14) were determined as 43.4 ± 1.6, – and 20.3 ± 6.2 µg/ml against LS180 (human colon adenocarcinoma); 53.2 ± 9.3, >100 and 27.6 ± 6.9 µg/ml against MCF-7 (human breast adenocarcinoma) and 40.0 ± 4.1, 48.8 ± 1.8 and 15.9 ± 0.3 µg/ml against MOLT-4 cell lines, respectively, which were comparable to the IC50 values of standard anticancer agent, cisplatin against the same cell lines. The red algae collected from the Persian Gulf contained substances that could inhibit the growth of human cancer cell lines and may represent a natural source for the discovery of novel anticancer agents.

C15 acetogenins from the Laurencia complex: 50 years of research – an overview

Abstract Acetogenins are secondary metabolites derived from the polyketide pathway and their potential role as chemotaxonomical markers for red algae belonging to the Laurencia complex has been long pointed out. C15 acetogenins from algae are quite different from plant acetogenins: they are usually halogenated, and have an enyne or a bromoallene terminal group. Since they were first reported, laurencin and other algal acetogenins have inspired great curiosity among natural product chemists and also those working with synthesis. This paper reviews the literature about C15 acetogenins, focusing on their distribution, chemical and biological aspects, including their reported biological activities.

Anticoagulant and antibacterial activities of polysaccharides of red algae Corallina collected from Lebanese coast.

In this work, we studied another species of red algae, Corallina, growing on the Lebanese coast of Batroun. The analysis of trace elements showed that Corallina was rich in K, Ca, Mg, Na, Si, Sr, P and Fe. Corallina was composed of 70.81% of saturated fatty acids, 25.54% of monounsaturated fatty acids and 3.65% of polyunsaturated fatty acids with palmitic acid as the main component. Moreover, the total yield of sulfated galactans and carrageenan was 2.5% and 10%, respectively. Both extracts exhibited anticoagulant effect but sulfated galactans were less potent than carrageenan. Sulfated galactans possessed inhibitory activity as well as bactericidal activity against all Gram-positive strains tested (Enterococcus faecalis ATCC 29212 and Staphylococcus epidermidis CIP 444). But, carrageenan was only able to inhibit the growth of S. epidermidis with a minimal inhibitory concentration (MIC) of 0.325 mg/mL. Furthermore, infrared spectroscopy (IR) revealed that the isolated carrageenan was of Lambda-type. Corallina could therefore be considered as a potential source of bioactive molecules that may be useful for the development of new pharmaceutical agents.

Crouania pumila sp. nov. (Callithamniaceae: Rhodophyta), a new species of marine red algae from the Seaflower International Biosphere Reserve, Caribbean Colombia / Crouania pumila sp. nov. (Callithamniaceae: Rhodophyta), una nueva especie de alga roja marina de la Reserva Internacional de la Biosfera Seaflower, Caribe colombiano

In the Colombian Caribbean, the marine macroalgal flora of the Seaflower International Biosphere Reserve has been little studied, despite its ecological importance. Historical records have reported only 201 macroalgae species within its area of almost 350 000km². However, recent surveys have shown a diversity of small algae previously overlooked. With the aim to determine the macroalgal diversity in the Reserve, we undertook field surveys in different ecosystems: coral reefs, seagrass beds, and rocky and sandy substrates, at different depths, from intertidal to 37m. During these field surveys, we collected a small described species belonging to the genus Crouania (Callithamniaceae, Rhodophyta), Crouania pumila sp. nov. that is decribed in this paper. This new species was distinguished from other species of the genus by a distinctive suite of traits including its diminutive size (to only 3.5mm in length), its decumbent, slightly calcified habit (epiphytic on other algae), its ramisympodial branching, the ecorticate main axes, and the elongate shape of the terminal cells of the cortical filaments. The observations were provided for both female (cystocarpic) and tetrasporangiate thalli; however, male thalli were not seen. Further studies have to be undertaken in this Reserve in order to carry out other macroalgal analysis and descriptions.

Crouania pumila sp. nov. (Ceramiaceae, Rhodophyta) es descrita para la isla de Providencia, en el Caribe colombiano. La nueva especie se destaca de las otras especies del género por características como su tamaño diminuto (hasta 3.5mm de largo), su hábito decumbente y poco calcificado (epífita sobre otras algas), su ramificación ramisimpodial, la ausencia de corticación y la forma alargada de las células terminales de los filamentos corticales. Se proveen observaciones sobre talos femeninos (cistocárpicos) y tetraspóricos. No se observaron talos masculinos.

Polysaccharides of the red algae 'Pterocladia' growing on the Lebanese coast: Isolation, structural features with antioxidant and anticoagulant activities.

In addition to their high nutritional value, red algae are of great interest as a source of therapeutic substances. However, despite their abundance on the Lebanese coast red algae have never been studied before. Therefore, we attempted to study among the available biomass one of the species of red algae growing on the Lebanese coast “Pterocladia”. We performed the extraction of trace elements, fatty acids, sulfated galactans and watersoluble polysaccharides of the phycocolloids family (carrageenans) whose physicochemical gelling or stabilizing effects attract many industrial sectors. The analysis of trace elements shows large amounts of potassium, calcium, silicon and iron. Moreover, Pterocladia appears to be rich in saturated fatty acids (69%) with palmitic acid as major fatty acid and 31% of monounsaturated fatty acids. The extraction yields were 2.7% for sulfated galactans and 11.5% for carrageenan. In order to elucidate their structures, H¹ NMR spectroscopy was performed as well as Infra-Red spectroscopy which allowed us to reveal their functional groups. A study of the antioxidant effect by the electrolysis method showed a greater effect for sulfated galactans. Furthermore, the study of the anticoagulant effect by APTT test, activated partial thromboplastin time, showed more pronounced anticoagulant power of sulfated galactans. The results of the present study confirmed the potential use of the red algae Pterocladia as a source of active known molecules.

Rhodophyta de ambientes lóticos de Unidades de Conservação da região Sul do Brasil

Espécies de Rhodophyta de 10 Unidades de Conservação da região Sul do Brasil foram investigadas. As amostragens foram conduzidas em 105 segmentos de riachos consistindo em transeções de 10 m de comprimento. O levantamento florístico resultou em 80 populações representando três gêneros, Batrachospermum, Kumanoa e Hildenbrandia, além do estágios 'Chantransia'. Batrachospermum foi representado por cinco espécies (B. arcuatum Kylin, B. atrum (Hudson) Harvey, B. helminthosum Bory, B. keratophytum Bory, B. puiggarianum Grunow in Wittrock & Nordstedt). O gênero Kumanoa foi representado por K. abilii (Reis) Necchi Júnior & Vis e K. ambigua (Montagne) Entwisle et al., enquanto Hildenbrandia exclusivamente por H. angolensis W. West & G.S. West. Nossos resultados confirmam Batachospermum como o gênero melhor representado, em termos de número de espécies, entre as Rhdophyta de água doce. Batrachospermum arcuatum foi registrado pela primeira vez na região Sul do Brasil, ampliando assim, o limite austral de sua distribuição.

Species of Rhodophyta from 10 Conservation Units from the south region of Brazil were surveyed. The samplings were carried out in 105 stream reaches, consisting of 10 m length transects. The floristic survey involved 80 populations, representing three genera, Batrachospermum, Kumanoa and Hildenbrandia plus the 'Chantransia' stages. Batrachospermum was represented by five species (B. arcuatum Kylin, B. atrum (Hudson) Harvey, B. helminthosum Bory, B. keratophytum Bory and B. puiggarianum Grunow in Wittrock & Nordstedt). The genus Kumanoa was represented by K. abilii (Reis) Necchi Júnior & Vis and K. ambigua (Montagne) Entwisle et al., while Hildenbrandia only by H. angolensis W.West & G.S.West. Our results confirm Batachospermum as the best represented genus, in terms of species number, among freshwater Rhdophyta. B. arcuatum was a new record for the south region of Brazil, thus extending its austral distribution range.

Heparinoides naturais isolados de rodofíceas (halymenia sp. ) arribadas na costa cearense / Natural heparinoids isolated from halymenia sp. (rhodophyceaes) delivery

A crescente carência de heparina (HEP) motiva a busca por fontes alternativas de novos anticoagulantes naturais. Objetivou-se avaliar a atividade anticoagulante dos polissacarídeos sulfatados (PS) isolados de uma rodofícea do gênero Halymenia, nativa do litoral cearense, Brasil.Os PS totais foram obtidos por digestões consecutivas com papaína em tampão acetato de sódio 0,1 M (pH 5,0), contendo cisteína 5 mM e EDTA 5 mM, seguidas por cromatografia de troca iônica em coluna de DEAE-celulose. As frações obtidas foram concentradas por liofilização e submetidas à eletroforese em gel de agarose a 0,5%. Os ensaios anticoagulantes foram realizados pelo tempo de tromboplastina parcial ativada (TTPA), usando-se plasma de coelho e uma curva padrão de HEP (100 UI mg-1). As extrações (53,96%) mostraram diferenças marcantes durante o fracionamento e no grau de resolução dos PS. A espécie apresentou PS com atividade anticoagulante superior a HEP. O TTPA das frações modificou-se acentuadamente entre as extrações, expressando-se de maneira dose-dependente e sofrendo um acréscimo de 110,40 (1a extração) para 143,10 UI mg-1 (3a extração). Os resultados sugerem que a atividade anticoagulante dos PS isolados de Halymenia sp. foi promovida pela inibição da via intrínseca e/ou comum da cascata de coagulação. As modificações no TTPA possivelmente serão elucidadas pelos mecanismos de ação envolvidos na coagulação e caracterização estrutural desses compostos. Portanto, a rodofícea Halymenia sp. é uma boa fonte de heparinoides e sugerem-se estudos relacionados ao cultivo da espécie, em proteção aos bancos de algas.

The increasing demand for heparin (HEP) has led to a search for alternative sources of natural anticoagulants. This study aimed to evaluate the anticoagulant activity of sulfated polysaccharides (SP) isolated from a Halymenia rhodophyceae genus native to the coast of Ceará, Brazil. Total SP were obtained by consecutive digestions with papain in 0.1 M sodium acetate buffer (pH 5.0) containing 5 mM cysteine and 5 mM EDTA, followed by ion-exchange chromatography on DEAE-cellulose column. The obtained fractions were concentrated by lyophilization and submitted to 0.5% agarose gel electrophoresis. Anticoagulant activity was evaluated by the activated partial thromboplastin time (APTT) using plasma from rabbits and a standard HEP (100 IU mg-1) curve. The extractions (53.96%) showed marked differences during the fractionation and in the degree of purification of SP. The species SP showed higher activity anticoagulant than that of HEP. However, the APTT of the fractions changed sharply among the extractions, expressing itself in a dose-dependent manner and increasing from 110.40 (1st extraction) to 143.10 IU mg-1 (3rd extraction). The results suggest that the anticoagulant activity of SP isolated from Halymenia sp. was promoted by inhibition of the intrinsic and/or common pathway of the coagulation cascade. The changes on APTT possibly will be elucidated through the mechanisms of action involved in coagulation and structural characterization of these compounds. Therefore, the red alga Halymenia sp. is a good source of heparinoids, and studies are suggested on the cultivation of this species and on the protection of natural algae banks.

Experiencias colombianas en la utilización de medios de cultivo y extractos experimentales a partir de macroalgas marinas del caribe: estado actual de su conocimiento / Colombian experiences in the use of culture media and experimental extracts from marine macroalgae of the caribbean sea: current state of knowledge

Después de desarrollarse una amplia y ambiciosa serie de investigaciones, se ha avanzado en aislamiento, purificación y caracterización química de las sustancias responsables de la actividad especialmente antibacterial y antifungicida, pero también antimitótica, citotóxica e ictiotóxica de los extractos orgánicos crudos, liofilizados y especificos (metanólicos) de algunas macroalgas marinas colombianas. Igualmente se ha determinado la cantidad y calidad del agar, agaroides y mucílagos obtenidos de algas rodofíceas en la región noroeste de Colombia. Tres grupos de investigación en diferentes ciudades del país, pero utilizando el material biológico recolectado en las regiones de Cartagena (Bolívar), Santa Marta (Magdalena) y Riohacha (Guajira), trabajan en los proyectos “Estudio preliminar para la obtención de agar bacteriológico a partir de algas nativas del Caribe colombiano” (Pontificia Universidad Javeriana, Bogotá), “Estudio de la actividad antimicrobiana de los extractos alcohólicos de algunas macroalgas del Caribe colombiano” (Universidad de Antioquia - Universidad Nacional de Colombia, Medellín), “Ensayos de actividad biológica y ecología química de extractos orgánicos crudos de algunas macroalgas del Caribe colombiano” (Universidad de Bogotá Jorge Tadeo Lozano, Santa Marta). Si se tiene en cuenta que en Colombia el consumo de agar bacteriológico asciende aproximadamente a una tonelada anual, es evidente que a partir de los resultados obtenidos en dichos proyectos sería posible disminuir los costos al producirse agar a partir de algas rojas, además de los avances biológicos, ecológicos, químicos y médicos previstos.

After developing a wide and ambitious series of investigations, advancements have been made regarding the isolation, purification and chemical characterization of the substances responsible for the antibacterial and antifungal activity, but also in the antimitotic, cytotoxic and ictiotoxic activity of the raw, liofilized and specific (metanolics) organic extracts of some Colombian marine macroalgae. In the same manner, the quantity and quality of the agar, agaroids and mucilages obtained from rodophyties algae in the northwest region of Colombia have been determined. Three research groups in different cities of the country, but using the biological material gathered in Cartagena (Bolívar), Santa Marta (Magdalena) and Riohacha (Guajira) regions work on the following projects: “Preliminary study on the obtainment of bacteriological agar from native algae of the Colombian Caribbean" (Pontificia Universidad Javeriana, Bogotá), “Study on the antibacterial activity of the alcoholic extracts of some macroalgae of the Colombian Caribbean” (Universidad de Antioquia - National University of Colombia, Medellín), “Tests on the biological activity and chemical ecology of raw organic extracts of some macroalgae of the Colombian Caribbean” (University of Bogotá Jorge Tadeo Lozano, Santa Marta). Keeping in mind that in Colombia, the consumption of bacteriological agar rises to approximately one annual ton, it is evident that based on the results obtained in these projects, it would be possible to diminish the costs when producing agar from red algae, as well as the expected biological, ecological, chemical, and medical advances.

The status of the name Alysium holtingii C. Agardh, a red alga described from Brazil, and a depiction of the type specimen

The type specimen of the red alga Alysium holtingii C. Agardh, described from Brazil, is located in the Lund Herbarium, and it is depicted for the first time in a publication. It is taxonomically identical to Dichotomaria obtusata (J. Ellis and Solander) Lamarck and thus can be treated as a later taxonomic synonym. Alysium is regarded as congeneric with Dichotomaria.

O espécime tipo da alga vermelha Alysium holtingii C. Agardh, descrito para o Brasil, está localizado no Herbário Lund, e é aqui apresentado. Ele é taxonomicamente idêntico a Dichotomaria obtusata (J. Ellis e Solander) Lamarck e portanto deve ser tratado como um sinônimo taxonômico posterior. Alysium é considerado como congenérico com Dichotomaria.

Antinociceptive properties in mice of a lectin isolated from the marine alga Amansia multifida Lamouroux

The antinociceptive effects of a lectin (LEC) isolated from the marine alga Amansia multifida were determined in Swiss mice. The LEC (1, 5, and 10 mg/kg) inhibited acetic acid-induced abdominal writhings in a dose-dependent manner after intraperitoneal or oral administration. A partial but significant inhibition of writhings was observed after the combination of LEC (10 mg/kg) with avidin (1 mg/kg), a potent inhibitor of the hemmaglutinant activity of the lectin. However, total writhing inhibition was demonstrable in the group of mice treated with LEC plus mannose (1 mg/kg), as compared to LEC alone or to control groups. Furthermore, avidin and mainly mannose also play a role in antinociception, somehow facilitating the interaction of LEC with its active cell sites. In the formalin test, although both phases of the response were significantly inhibited, the effect of LEC was predominant during phase 2, causing inhibition of licking time that ranged from 48 to 88 percent after oral (5 and 10 mg/kg) and intraperitoneal (1 to 5 mg/kg) administration. As is the case with morphine, the effect of LEC (2 mg/kg) was reversed by naloxone (2 mg/kg), indicating the involvement of the opioid system. LEC was also effective in the hot-plate test, producing inhibitory responses to the thermal stimulus, and its effects were blocked by naloxone. In the pentobarbital-induced sleeping time, although LEC did not alter the onset of sleep significantly, it increased the time of sleep within the same dose range compared to control. These results show that LEC presents antinociceptive effects of both central and peripheral origin, possibly involving the participation of the opioid system.

Chemical constituents of Hypnea charoides / 中草药

Objective To investigate the chemical constituents of red algae Hypnea charoides. MethodsThe constituents were isolated by column chromatography and their structures were elucidated by chemical properties and spectroscopic analyses. Results Three compounds were isolated and their structures were identified as 3, 6-dimethyl-8-(4-methyleneheptan-3-yloxy) octane-1-amine (Ⅰ), palmitate-K (Ⅱ), and (2R, 1′S, 2′S, 3′R)-N-(1′-hydroxymethyl-2′, 3′-dihydroxy-heptadecenyl)-2-hydroxy-12, 13-methylene-tetracosanamide (Ⅲ). Conclusion Compounds Ⅰ and Ⅲ are new compounds named as charoidesine and charoidesamide.