An Assessment of Seaweeds Diversity and Distribution at the Beach of Nathia Gali, Karachi, Pakistan

Qari, Rashida

doi:10.4172/2155-9910.1000228

Cited by 3 publications

(3 citation statements)

References 18 publications

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“…The variation were found in alginic acid, and carbohydrate concentrations at studied shore in different seasons due to the environmental factors like temperature, pH, light, salinity and dissolved oxygen [19,31,32]. In present work the colour of alginic acid was dark brown i.e., it was as commercial standard [33].…”

Section: Methodsmentioning

confidence: 60%

A Comparative Study on the Seasonal Variation in Alginic Acid Extracted from two Brown Seaweed Species P. pavonica Linnaeusand P. tetrastromatica Hauck

Qari¹,

Siyal²,

Mahar³

2019

Act Scie Micro

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ability to form gels and viscous solutions contributes to the flexibility of algae. Among the macromolecules of the Sargassum, Padina, Cytosmear and other brown algae, alginic acid was identified as the most important constituent [5]. Alginic acid is widely demanded in food, pharmaceutical, textile, paint and paper industries. Properties of alginic acid utilized in these products are thickening, stabilizing, gel forming and film forming. Seaweeds play a small but very important role in the direct economy of many countries. Commercially alginate is principally extracted from species of Microcystis, Laminaria, Ascophyllan and Sargassum. The world market for alginates, excluding China, was over 22,000 tonnes per annum and worth almost US$45M in 1990. Biochemical constituents of seaweeds such as carbohydrate, ash, protein, amino acid and lipids etc. have been extensively investigated in various parts of the world , to mention a few: Dictyota

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Section: Methodsmentioning

confidence: 60%

A Comparative Study on the Seasonal Variation in Alginic Acid Extracted from two Brown Seaweed Species P. pavonica Linnaeusand P. tetrastromatica Hauck

Qari¹,

Siyal²,

Mahar³

2019

Act Scie Micro

Self Cite

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“…The yield of agar was high during winter season. This may be due to high biomass in winter because in this period high nutrient availability and low temperature and light intensity (Qari, 2017).…”

Section: Resultsmentioning

confidence: 99%

Agar Extraction, Physical Properties, FTIR Analysis and Biochemical Composition of Three Edible Species of Red Seaweeds Gracilaria corticata (J. Agardh), Gracilaria dentata (J. Agardh) and Gracilariopsis longissima (S. G. Gmelin)........

Qari

Haider

2021

Pakistan Journal of Scientific & Industrial Research

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Three species of red algae Gracilaria corticata (J. Agardh), Gracilaria dentata (J. Agardh) and Gracilariopsis longissima (S.G. Gmelin), Steentoft, L. M; Irvine and Farnham (formerly Gracilaria verrucosa (Hudson) were collected from four different sites (Buleji, Hawks Bay, Manora and Paradise Point) of Karachi coast. The G. corticata was the dominant species and the highest yield of agar was compared to other studied species. The physical properties such as gel temperature, melting temperature, density, viscosity and gel strength showed large variations. Interestingly, the gel temperature, melting temperature, density, and gel strength had the highest value in G. corticata samples collected, while gel viscosity recorded the highest value in G. dentata samples. Intensive spectroscopic FTIR analysis was determined in all three species of G. corticata, G. dentata and G. longissima. The bands at 414.7/cm to 3917.2/cm represents stretching and bending vibrations of alcohol O-H, amine N-H, alkane C-H, alkyne C=C, nitriles C=N, carboxyl C=O, nitro aromatic N=O, alkane C-C, nitro methane C-N, aliphatic amines C-N, sulfoxides S=O, alkene C-H alkyl halide C-Cl, C-I groups. The ash content of all studied species (G. corticata, G. dentata and G. longissima) was in the range of 20-30%, while the carbohydrate content was in the range of 22-24%. The results of this study suggested the utilization of our natural resources present in Karachi coast. This could be achieved by determining the quantity and quality of agar in the edible species of Gracilaria/Gracilariopsis.

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“…Qari et al (2014) studied Phytomass on a natural bed of seaweed at Paradise Point, Karachi coast. Qari (2017) assessed the seaweed diversity and distribution at the beach of Nathia gali, Karachi, Pakistan. Seaweeds are non-vascular, photosynthetic that inhabit the coastal regions commonly within rocky intertidal or submerged reef-like habitats and have been one of the richest and most promising sources of bioactive primary and secondary metabolites with antimicrobial properties (Chapman, 1950;Jebasingh et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Phycochemical and Biological Activities From Different Extracts of Padina antillarum (Kützing) Piccone

et al. 2022

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Seaweeds are non-vascular, photosynthetic that inhabit the coastal regions commonly within rocky intertidal or submerged reef-like habitats and have been one of the richest and most promising sources of bioactive primary and secondary metabolites with antimicrobial properties. They selectively absorb elements like Na, K, Ca, Mg, I, and Br from the seawater and accumulate them in their thalli. Padina antillarum (Kützing) Piccone is a member of Phaeophycota and has remarkable phycochemistry as well as bioactivity. The phycochemical tests of the different extracts showed the presence of alkaloids, terpenoids, saponins, tannins, steroids, and phenols. The relative percentage of Oxirane, tetradecyl (C16H32O), and Cyclononasiloxane (C18H54O9Si9) are higher while Tetrasiloxane (C16H50O7Si8) is lowest in Gas Chromatography – Mass Spectrometry analysis. FRAP, %inhibition, the total antioxidant value of P. antillarum was higher in methanolic extract. Hexane, chloroform extracts showed no zone of inhibition against Bacillus subtilis, Escherichia coli, Klebsiella pneumonia, Staphylococcus aureus, and Staphylococcus epidermidis. The methanolic extract of P. antillarum exhibits a maximum zone of inhibition against S. epidermidis (18.66 ± 0.09). Antifungal activity of the P. antillarum in hexane extract exhibited no zone of inhibition against Aspergillus niger and Penicillium notatum while the chloroform extract yields maximum zone (37 ± 0.012, 21.66 ± 0.03). Diabetes mellitus is one of the most familiar chronic diseases associated with carbohydrate metabolism. It is also an indication of co-morbidities such as obesity, hypertension, and hyperlipidemia which are metabolic complications of both clinical and experimental diabetes. The treatment of P. antillarum methanol extract in mice reduced the body weight loss, low level of triglycerides, and elevated HDL cholesterol level as compared to diabetic mice.

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An Assessment of Seaweeds Diversity and Distribution at the Beach of Nathia Gali, Karachi, Pakistan

Cited by 3 publications

References 18 publications

A Comparative Study on the Seasonal Variation in Alginic Acid Extracted from two Brown Seaweed Species P. pavonica Linnaeusand P. tetrastromatica Hauck

A Comparative Study on the Seasonal Variation in Alginic Acid Extracted from two Brown Seaweed Species P. pavonica Linnaeusand P. tetrastromatica Hauck

Agar Extraction, Physical Properties, FTIR Analysis and Biochemical Composition of Three Edible Species of Red Seaweeds Gracilaria corticata (J. Agardh), Gracilaria dentata (J. Agardh) and Gracilariopsis longissima (S. G. Gmelin)........

Phycochemical and Biological Activities From Different Extracts of Padina antillarum (Kützing) Piccone

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