Antioxidant activity of seagrasses of the Mandapam coast, India

Figures & data

Table 1.  Levels of total phenolic content in seagrasses.

Seagrasses	Phenol (mg GAE/g)
Enhalus acoroides	0.4078 ± 0.023^e
Halophila ovalis	0.4247 ± 0.020^e
Halophila ovata	0.3340 ± 0.025^f
Halophila stipulacea	1.3987 ± 0.055^a
Syringodium isoetifolium	0.4631 ± 0.034^e
Cymodocea serrulata	0.5449 ± 0.039^d
Thalassia hemprichii	0.7421 ± 0.034^b
Halodule pinifolia	0.6468 ± 0.040^c

Data are expressed as mean ± standard deviation, means within each column with different letters (a–f) differ significantly (p < 0.05).

Table 2.  Antioxidant activity of seagrass extracts determined by TAA and FRAP assays.

Seagrasses	Total Antioxidant Activity (mg ascorbic acid/g)	FRAP Assay (mg Gallic acid/g)
Enhalus acoroides	8.439 ± 0.779^f	3.373 ± 0.108^g
Halophila ovalis	17.602 ± 1.005^de	12.042 ± 0.247^e
Halophila ovata	11.908 ± 0.972^ef	5.856 ± 0.104^f
Halophila stipulacea	75.027 ± 5.199^b	46.289 ± 1.002^a
Syringodium isoetifolium	32.959 ± 3.971^c	26.557 ± 1.119^d
Cymodocea serrulata	32.415 ± 3.935^c	28.423 ± 1.086^c
Thalassia hemprichii	20.453 ± 2.329^d	27.979 ± 1.445^cd
Halodule pinifolia	132.382 ± 7.524^a	42.611 ± 0.800^b
Ascorbic acid	NA	122.880 ± 1.535
Gallic acid	NA	NA

Data are expressed as mean ± standard deviation, means within each column with different letters (a–g) differ significantly (p < 0.05), NA—not analyzed.

Table 3.  Antioxidant activity of seagrasses.

Seagrasses	DPPH assay (%)
Enhalus acoroides	24.133 ± 0.153^c
Halophila ovalis	21.21 ± 0.233^d
Halophila ovata	16.926 ± 0.386^e
Halophila stipulacea	67.413 ± 0.956^a
Syringodium isoetifolium	23.676 ± 0.468^c
Cymodocea serrulata	61.853 ± 0.317^b
Thalassia hemprichii	61.64 ± 0.695^b
Halodule pinifolia	68.066 ± 0.181^a
Ascorbic acid	57.28 ± 0.531
Gallic acid	55.753 ± 0.441

Figure 1.  Correlation of FRAP and TAA values of seagrass ethanolic extracts from (1) Enhalus acoroides, (2) Halophila ovalis, (3) H. ovata, (4) H. stipulacea, (5) Syringodium isoetifolium, (6) Cymodocea serrulata, (7) Thalassia hemprichii, and (8) Halodule pinifolia.

Figure 2.  Correlation of FRAP and TPC values of seagrass ethanolic extracts from (1) Enhalus acoroides, (2) Halophila ovalis, (3) H. ovata, (4) H. stipulacea, (5) Syringodium isoetifolium, (6) Cymodocea serrulata, (7) Thalassia hemprichii, and (8) Halodule pinifolia.

Figure 3.  Correlation of TAA and TPC values of seagrass ethanolic extracts from (1) Enhalus acoroides, (2) Halophila ovalis, (3) H. ovata, (4) H. stipulacea, (5) Syringodium isoetifolium, (6) Cymodocea serrulata, (7) Thalassia hemprichii, and (8) Halodule pinifolia.