Optimization of microencapsulation and stability evaluation of astaxanthin-rich shrimp shell extract

The goal of this research was to find the best way to use shrimp shell as a source of astaxanthin and as an agricultural waste in shrimp processing site. For this purpose, first shrimp shell extract was extracted with the assisting ultrasonic . Then it was encapsulated using different walls (modified starch and maltodextrin with hydrolysis degree of 7 and 20) and spray drying method. Wall composition design was performed using response surface method and simplex lattice design with augmented axial points in mixture design (14 wall compositions). Evaluation of physicochemical properties of microcapsules (moisture content, microencapsulating efficiency, astaxanthin content and antioxidant power) showed that the use of a mixture of maltodextrin and modified starch walls up to the center point of the triangular design (33.33%) improved the physicochemical properties compared to using of walls alone. Optimization of different wall concentrations for microencapsulation of shrimp shell extract containing astaxanthin using numerical and graphical optimization showed that the optimal wall composition containing 18.40% of maltodextrin with a hydrolysis degree7, 41.78% of modified starch and 39.81% of maltodextrin with a hydrolysis degree 20. Also, the stability of astaxanthin in microcapsules during 42 days of storage in different conditions of temperature (4 and 25ͦ C) and humidity (52 and 75%) showed that the amount of astaxanthin decreased linear in all samples (linear coefficient more than 98%), but the amount of final astaxanthin in different samples was significantly different from each other (p <0.5). Reducing the temperature and relative humidity of the storage environment resulted in better preservation of astaxanthin in microcapsules and microcapsules containing optimal wall composition and equal composition of each walls at 4 ° C and relative humidity of 52% had the highest stability of astaxanthin with half-life 94.93 and 92.42 days, respectively compared to other microcapsules

The effect of quinoa germs on the quality of wheyless cheese

The production of imitation whey-less cheeses is one of the new achievements in the dairy industry, which has been noted for its nutritional and economic aspects. In these cheeses, it is possible to increase the nutritional value of cheese and decrease the production costs by using plant ingredients. The effect of quinoa germs was investigated on the physicochemical properties, phenol compounds, textural profile, and microbial and sensory properties of whey-less cheese. The results showed that with increasing quinoa germs, the dry matter, acidity, and fat in dry matter content increased and moisture and protein content decreased in all samples (p<0.05). The value of hardness, springiness and cohesiveness of the samples containing quinoa germs were significantly lower than the control sample (without quinoa germs). However, the samples with higher amounts of quinoa germs had the highest hardness, springiness, cohesiveness, gumminess and chewiness compared to the ones with lower values of quinoa germs (p<0.05). According to the sensory results, the flavor score was significantly improved by adding the quinoa gems up to 6%. But with the increasing germs to 9 %, the flavor score decreased significantly (p<0.05). Based on the results obtained in this study, 6% of quinoa germs can be used in the preparation of whey-less functional cheese

The Effect of Xanthan Gum and Flaxseed Mucilage as Edible Coatings in Cheddar Cheese during Ripening

The object of this study was to investigate the possibility of using xanthan gum and flaxseed mucilage as edible coatings for Cheddar cheese during ripening for 90 days. Five samples of Cheddar cheese blocks were coated with different coating materials in triplicate as follows: Coated with polyvinyl acetate as control (C), coated with 0.5% xanthan gum (XG), coated with 0.75% flaxseed mucilage (FM1), coated with 1% flaxseed mucilage (FM2), and coated with 1.25% flaxseed mucilage (FM3). All samples were kept at 8 ± 2 °C in a cold room for 90 days. The statistical analysis of the results showed that the moisture content of the samples decreased and the protein content increased during the ripening period (P &lt; 0.01). The pH, acidity, fat in dry matter, and TCA-SN/TN of samples were significantly affected by xanthan gum and flaxseed mucilage treatment (P &lt; 0.01). The free fatty acid composition of samples was significantly affected by edible coatings. Edible coatings affected the growth of non-starter lactic acid bacteria and the total mesophilic aerobic bacteria in a non-significant manner (P &gt; 0.01). The growth of starter bacteria was significantly altered under the effect of edible coating materials (P &lt; 0.05). Tyrosine and tryptophan contents as an index of proteolysis, lipolysis, and sensory evaluation of samples were not significantly different