Physico-chemical properties of water, proximate composition, minerals and antioxidant of six species of seagrasses at Merambong shoal, Johore, Malaysia

Seagrass has not yet been claimed as a dietary stuff and source of medicine for human consumption. Since several seagrass species are edible, investigation of nutrient, proximate composition and antioxidant properties in marine macrophytes are very important. Thus, the objectives of this study were...

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Main Author:	Wan Nawi, Wan Hazma
Format:	Thesis
Language:	English
Published:	2017
Subjects:	Seagrasses - Malaysia Seagrasses - Ecology
Online Access:	http://psasir.upm.edu.my/id/eprint/70525/1/FP%202017%2057%20IR.pdf
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spelling	my-upm-ir.705252019-08-20T00:44:18Z Physico-chemical properties of water, proximate composition, minerals and antioxidant of six species of seagrasses at Merambong shoal, Johore, Malaysia 2017-03 Wan Nawi, Wan Hazma Seagrass has not yet been claimed as a dietary stuff and source of medicine for human consumption. Since several seagrass species are edible, investigation of nutrient, proximate composition and antioxidant properties in marine macrophytes are very important. Thus, the objectives of this study were to assess the physico-chemical and nutrient status of seawater in the seagrass habitat, determine the proximate composition, mineral contents and screening the antioxidant properties of six seagrass species; Enhalus acoroides, Thalassia hemprichii, Cymodocea serrulata, Halodule uninervis, Halophila ovalis (small and big-leaved) and Halophila spinulosa at Merambong shoal, Johore during the low tide, from March to August 2013. Nutritive proximate compositions were estimated following analysis methods described by the Association of Official Analytical Chemists. Results showed that seagrasses were high in carbohydrate (48.99-83.03%), fiber (10.02-27.48%) and ash (11.46-41.69%), and low in lipid content (0.02-1.22%). The protein content showed variation with species ranged 5.50% to 16.04%. The moisture content range from 6.68-21.49%. Macro-(Nitrogen-N, Phosphorus-P, Potassium-K, Calcium-Ca, Magnesium-Mg) and micro-(Zinc-Zn, Iron-Fe, Manganese-Mn, Copper-Cu) minerals measured using Atomic Absorption Spectrophotometer (AAS) and their concentrations varied with species and time. Minerals content; N, P, K, Ca, Mg, Zn, Fe, Mn, and Cu ranged 3308.00-36826.67 mg kg-1, 429.33-3400.00 mg kg-1, 2025.33-29520.00 mg kg-1, 4680.00-25280.00 mg kg-1, 3244.00-13040.00 mg kg-1, 85.33-180.00 mg kg-1, 922.67-5657.33 mg kg-1, 13.33-129.33 mg kg-1 and 3.20-29.20 mg kg-1 respectively. Trend in micro-nutrient contents categorically followed a simple pattern, Fe>Zn>Mn>Cu. Methanol extracts of seagrasses were used to examine antioxidant activity by DPPH radical scavenging activity, total phenolic content (TPC) content and total flavonoid content (TFC). DPPH scavenging activity, TPC and TFC significantly different (p<0.05) between seagrass species with month. Rhizomes of E. acoroides and H. uninervis had relatively higher antioxidant activity (0.34 mg ml-1 in June and 0.26 mg ml-1 in July and August of EC50 value respectively). Total phenolic content of seagrasses at Merambong shoal ranged 1.02 to 91.77 mg GAE kg-1 with lower content in March and higher in August. The values of TFC were also varied among species and months (ranged from 43.25 to 361.46 mg QE kg-1). Based on biplots generated by Principle component analysis (PCA), there were clear separation of proximate composition and mineral contents of seagrass species with locations from Malaysia and other regions. In conclusion, seagrasses possessed essential nutrient content and good antioxidant properties that could be utilized for pharmaceutical and nutraceutical uses. Seagrasses - Malaysia Seagrasses - Ecology 2017-03 Thesis http://psasir.upm.edu.my/id/eprint/70525/ http://psasir.upm.edu.my/id/eprint/70525/1/FP%202017%2057%20IR.pdf text en public masters Universiti Putra Malaysia Seagrasses - Malaysia Seagrasses - Ecology
institution	Universiti Putra Malaysia
collection	PSAS Institutional Repository
language	English
topic	Seagrasses - Malaysia Seagrasses - Ecology
spellingShingle	Seagrasses - Malaysia Seagrasses - Ecology Wan Nawi, Wan Hazma Physico-chemical properties of water, proximate composition, minerals and antioxidant of six species of seagrasses at Merambong shoal, Johore, Malaysia
description	Seagrass has not yet been claimed as a dietary stuff and source of medicine for human consumption. Since several seagrass species are edible, investigation of nutrient, proximate composition and antioxidant properties in marine macrophytes are very important. Thus, the objectives of this study were to assess the physico-chemical and nutrient status of seawater in the seagrass habitat, determine the proximate composition, mineral contents and screening the antioxidant properties of six seagrass species; Enhalus acoroides, Thalassia hemprichii, Cymodocea serrulata, Halodule uninervis, Halophila ovalis (small and big-leaved) and Halophila spinulosa at Merambong shoal, Johore during the low tide, from March to August 2013. Nutritive proximate compositions were estimated following analysis methods described by the Association of Official Analytical Chemists. Results showed that seagrasses were high in carbohydrate (48.99-83.03%), fiber (10.02-27.48%) and ash (11.46-41.69%), and low in lipid content (0.02-1.22%). The protein content showed variation with species ranged 5.50% to 16.04%. The moisture content range from 6.68-21.49%. Macro-(Nitrogen-N, Phosphorus-P, Potassium-K, Calcium-Ca, Magnesium-Mg) and micro-(Zinc-Zn, Iron-Fe, Manganese-Mn, Copper-Cu) minerals measured using Atomic Absorption Spectrophotometer (AAS) and their concentrations varied with species and time. Minerals content; N, P, K, Ca, Mg, Zn, Fe, Mn, and Cu ranged 3308.00-36826.67 mg kg-1, 429.33-3400.00 mg kg-1, 2025.33-29520.00 mg kg-1, 4680.00-25280.00 mg kg-1, 3244.00-13040.00 mg kg-1, 85.33-180.00 mg kg-1, 922.67-5657.33 mg kg-1, 13.33-129.33 mg kg-1 and 3.20-29.20 mg kg-1 respectively. Trend in micro-nutrient contents categorically followed a simple pattern, Fe>Zn>Mn>Cu. Methanol extracts of seagrasses were used to examine antioxidant activity by DPPH radical scavenging activity, total phenolic content (TPC) content and total flavonoid content (TFC). DPPH scavenging activity, TPC and TFC significantly different (p<0.05) between seagrass species with month. Rhizomes of E. acoroides and H. uninervis had relatively higher antioxidant activity (0.34 mg ml-1 in June and 0.26 mg ml-1 in July and August of EC50 value respectively). Total phenolic content of seagrasses at Merambong shoal ranged 1.02 to 91.77 mg GAE kg-1 with lower content in March and higher in August. The values of TFC were also varied among species and months (ranged from 43.25 to 361.46 mg QE kg-1). Based on biplots generated by Principle component analysis (PCA), there were clear separation of proximate composition and mineral contents of seagrass species with locations from Malaysia and other regions. In conclusion, seagrasses possessed essential nutrient content and good antioxidant properties that could be utilized for pharmaceutical and nutraceutical uses.
format	Thesis
qualification_level	Master's degree
author	Wan Nawi, Wan Hazma
author_facet	Wan Nawi, Wan Hazma
author_sort	Wan Nawi, Wan Hazma
title	Physico-chemical properties of water, proximate composition, minerals and antioxidant of six species of seagrasses at Merambong shoal, Johore, Malaysia
title_short	Physico-chemical properties of water, proximate composition, minerals and antioxidant of six species of seagrasses at Merambong shoal, Johore, Malaysia
title_full	Physico-chemical properties of water, proximate composition, minerals and antioxidant of six species of seagrasses at Merambong shoal, Johore, Malaysia
title_fullStr	Physico-chemical properties of water, proximate composition, minerals and antioxidant of six species of seagrasses at Merambong shoal, Johore, Malaysia
title_full_unstemmed	Physico-chemical properties of water, proximate composition, minerals and antioxidant of six species of seagrasses at Merambong shoal, Johore, Malaysia
title_sort	physico-chemical properties of water, proximate composition, minerals and antioxidant of six species of seagrasses at merambong shoal, johore, malaysia
granting_institution	Universiti Putra Malaysia
publishDate	2017
url	http://psasir.upm.edu.my/id/eprint/70525/1/FP%202017%2057%20IR.pdf
_version_	1747812858967621632

Physico-chemical properties of water, proximate composition, minerals and antioxidant of six species of seagrasses at Merambong shoal, Johore, Malaysia

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