|
|
|
|
|
|
|
|
|
|
|
RSS |
|
|
|
 |
|
|
|
|
 |
Search published articles |
 |
|
Showing 2 results for arbabi
Samere Arbabi, Paria Akbary, Zahra Aminikhoei,
Volume 29, Issue 6 (2-2021)
Abstract
Today, microalgae are considered as an important source for the production of biofuels and pharmaceutical products. However, the lack of an efficient and economical method for dewatering and harvesting their biomass is is an important challenge to achieve this goal. The important issue for choosing the harvesting method are species characteristics, final product value and energy consumption. Therefore, in this study, the effect of flocculation method with pH change technique (range 6 to 11) using sodium hydroxide and hydrogen chloride on harvesting efficiency, and fatty acid content of Dunaliella salina was tested. The results of this study showed that with the addition of sodium hydroxide and increasing the pH from 8.2 to 9.8, the flocculation process increased upwards from 18 to 90% and then remained constant until: pH 11. In contrast, increasing hydrogen chloride and creating an acidic environment up to: pH equal to 6 had no effect on clot stimulation. The highest coefficient of biomass concentration was observed in alkaline treatment with pH: equivalent to 9.8 which was 10 times the initial concentration (at pH equal to 8.2 the effect of alkaline pH induction technique and the centrifuge technique on the fatty acids content of biomass was tested. In the next stage, the effect of alkaline pH induction technique and the centrifuge technique on the fatty acids content of biomass was tested. The analysis showed that the percentage of lipid and fatty acids of harvested biomass were significantly different from each other. Based on the obtained results, the flocculation method by increasing the pH by 9.8 is a simple and relatively inexpensive technique with high efficiency and is suitable for harvesting Dunaliella salina microalgae for specific purposes.
Arash Shakoori, Fatemeh Arbabi, Shahab Rahul,
Volume 32, Issue 6 (2-2024)
Abstract
Knowledge of the proximate composition of invertebrates such as sea cucumbers helps to improve our understanding of the nutritional importance of these organisms. In this study, the approximate composition (protein, fat, ash, and moisture) of two species of sea cucumbers, Holothuria leucospilota and Stichopus herrmanni, in Chabahar Bay during 4 seasons of 2022, was investigated based on standard methods. Sea cucumbers were transported to the laboratory after collection. Approximately 20 grams of muscle was used for each sample. Analysis (in triplicate) was performed to check the proximate compounds. The results showed that the percentage of protein than fat was higher in both cucumber species and the percentage of protein and fat in H. leucospilota species was higher than S. hermanni, so that the highest crude protein in the summer season was for H. leucospilota species (72±0.54). 7.7%) and the lowest value was recorded for S. hermanni in spring season (3.23±0.26%). The highest fat content was observed in the spring season (4.56±0.29%) in H. leucospilota species and the lowest in winter season (1.47±0.66%) in S. hermanni species. The percentage of moisture and ash was higher in S. hermanni species than H. leucospilota. The highest humidity percentage was for summer season (87.09±0.45%) in S. hermanni species and the lowest for winter season (81.63±0.48%) in H. leucospilota species. The highest amount of ash was in autumn (4.81±0.49%) for S. hermanni and the lowest for H. leucospilota in summer (1.23±0.28%). Compared to the other studied species, H. leucospilota species is nutritionally more suitable due to its high caloric value and sufficient crude protein content.
|
|
