Natural preservative ingredient from marine alga Ulva lactuca L.

Abstract

The contents of total chlorophyll (T-Chl), carotenoids and phenolics compounds were quantified in the biomasses of Ulva lactuca grown either in normal or artificial sea water under indoor conditions. The antioxidant and antibacterial activities of U. lactuca crude organic extracts (Ulva-COEs) were determined. Thirty-four compounds in Ulva-COEs were characterised by thin layer chromatography and highperformance liquid chromatography. The major compounds were chlorophyll a (Chl a) (15.60-30.90%) and b (Chl b) (12.20-14.89%), 9-cis b-carotene (13.12-14.47%), a-carotene (11.44-11.47%) and all-trans bcarotene (6.16-29.70%, of total carotenoids).The Ulva-COEs exhibited remarkable antioxidant activity, with an IC 50 (concentration which causes a 50% of DPPH radical scavenging activity) values ranged from 16.5 and 18.7 lg mL )1 , which could be compared with the synthetic antioxidants: a-tocopherol (14.4 lg mL )1 ), butylated hydroxyanisol (13.1 lg mL )1 ) and butylated hydroxyltoluene (13.1 lg mL )1 ). Also, Ulva-COEs exhibited great potential antibacterial activities against six bacterial strains, with minimal inhibitory concentration values ranged from 0.40 to 0.35 mg mL )1 .

Preservative Effect of Algae Extracts on Lipid Composition and Rancidity Development in Brine‐Canned Atlantic Chub Mackerel (Scomber colias)

“…In agreement with this difference, a valuable polyphenol content (53.5 ± 5.0 mg GAE g −1 lyophilized alga) was measured in F. spiralis samples employed in the current study, while U. lactuca showed a markedly lower polyphenol content (0.7 ± 0.6 mg GAE g −1 lyophilized alga). However, previous research has reported on the antioxidant behaviour of U. lactuca , this activity being explained by the presence of preservative molecules such as tocopherols, carotenoids, phenolic compounds, and sulfates …”

Interaction of Photoprotective and Acclimation Mechanisms in Ulva rigida (Chlorophyta) in Response to Diurnal Changes in Solar Radiation in Southern Chile

“…Thus, the potential antioxidant effect of the phenolic and nonenzymatic compounds of Ulva rigida (Abd El‐Baky et al. , Hassan and Ghareib , Fabrowska et al. , Messyasz et al.…”

“…In contrast, in algae exposed to PAR treatment the maximum increase was 40%. Thus, the potential antioxidant effect of the phenolic and nonenzymatic compounds of Ulva rigida (Abd El-Baky et al 2009, Hassan and Ghareib 2009, Fabrowska et al 2016, Messyasz et al 2018) could be ruled out, due to its low activity, delayed increase (only after 16 h), and undifferentiated response to UV stress. In fact, there were no significant changes between treatments with and without the presence of UV radiation.…”

The Potential Use of Microalgal Carotenoids as Dietary Supplements and Natural Preservative Ingredients

“…However, the worldwide market value of all carotenoids was US$887 million in 2004 and reached US$1,023 million by the end of the decade (Del Campo et al, 2007). Many studies reported that carotenoids of Dunaliella are efficacious in preventing oxidative stress-related lung and liver pathologies due to scavenging of the reactive oxygen species, generated during pathological processes (Hughes, 1997;Raja et al, 2007;Abd El-Baky et al, 2009b). Therefore, the scavenging of oxygen free radicals ( 1 O 2 , .…”

“…The chemical composition of some microalgae indicates that it has a high nutritional value due to a wide range of essential nutrients-such as vitamins, minerals, and proteins (Sathivel et al, 2008;Abd El-Baky et al, 2006). Moreover, it contains a wide range of compounds that are used or could be potentially employed as functional ingredients including carotenoids, polyphenols and other antioxidant pigments, and omega (ω)-3 and ω-6 polyunsaturated fatty acids (Abd El-Baky et al, 2008, 2009b.…”