Photoprotection and antioxidative metabolism in Ulva lactuca exposed to coastal oceanic acidification scenarios in the presence of Irgarol

The valorification of the marine biomass is an important resource for many industries like pharmaceutical, supplying raw material for the extraction of bioactive substances (vitamins, sterols and collagen), cosmetics, biofertilizers and wastewater treatment. In the last years a special attention has been given to the use of macroalgae. The aim of this study was to emphasize the capacity of two representative green algae species frequent presents on the Romanian shore, Ulva lactuca (L.) and Cladophora vagabunda (L.) Hoek, to remove two usual detergents from wastewater. The green algae washed, dried at room temperature, macerated to powder were introduced into different filter paper for comparison, then immersed in waste water treated with different concentrations of detergents. Tap water was used for the experiment. The results show that Ulva lactuca (L.) species is suitable than Cladophora vagabunda (L.) Hoek species, for wastewater treatment.

Download Full-text

PHYTOCHEMICAL STUDIES ON ULVA LACTUCA (L.) THURET FROM RED SEA COAST OF JEDDAH, SAUDI ARABIA

Egyptian Journal of Phycology ◽

10.21608/egyjs.2007.114562 ◽

2007 ◽

Vol 8 (1) ◽

pp. 185-194

Author(s):

Zeinab El Sewafy ◽

Naseem Radi

Keyword(s):

Saudi Arabia ◽

Red Sea ◽

Ulva Lactuca ◽

Red Sea Coast ◽

Phytochemical Studies ◽

Sea Coast

Download Full-text

Optimizing the ultrasonic-assisted extraction of antioxidants from Ulva lactuca algal biomass using factorial design

Biomass Conversion and Biorefinery ◽

10.1007/s13399-021-01516-8 ◽

2021 ◽

Author(s):

Sayed Rashad ◽

Ghadir El-Chaghaby ◽

Eder C. Lima ◽

Glaydson Simoes dos reis

Keyword(s):

Factorial Design ◽

Algal Biomass ◽

Ulva Lactuca ◽

Extraction Technique ◽

Extraction Solvent ◽

Assisted Extraction ◽

Study Results ◽

Ultrasonic Assisted ◽

Ultrasonic Assisted Extraction ◽

Optimum Extraction

AbstractUltrasonic-assisted extraction (UAE) is increasingly emerging as a highly effective extraction technique. This extraction technique is affected by several experimental factors. The present work aimed to optimize the ultrasonic-assisted extraction of antioxidants from Ulva lactuca (sea lettuce), widespread macroalgae growing along the Mediterranean coast. In this respect, a full-factorial design (23) was employed to assess the effect of three different factors at two levels and their interactions on the extraction of antioxidants from sea lettuce algal biomass. The studied factors were extraction solvent, time of extraction, and temperature. The two levels chosen for extraction solvent were 100% ethanol and 50% ethanol, for the sonication time (1 h and 3 h) and temperature (25 °C and 40 °C). All experiments were done using an ultrasonic bath, and the biomass to solvent ratio was kept at 1:5. Total antioxidant capacity and quercetin concentration were set as the two responses for optimum output. The results showed that the temperature and solvent were the dominating factors that significantly affect the extraction process. The optimum extraction parameters were extraction time of 1 h, 50% ethanol, and temperature of 25 °C. Under these conditions, the maximum value for TAA was calculated as 2166.51 mg of ascorbic acid equivalent per gram (mg/g of AAE), and quercetin showed a maximum calculated value of 42.5 mg/g with combined desirability of 0.91 for the two responses. The present study results indicate that U. lactuca can be used as a source of antioxidants and phenolic compounds that can be applied in food and medicine at optimum extraction conditions. Graphical abstract

Download Full-text