Chemical, physical, rheological and sensory properties of biscuit fortified with protein hydrolysate from cephalothorax of Pacific white shrimp.

Chemical, physical, rheological and sensory properties of biscuits fortified with shrimp protein hydrolysate powder (SHP) at various levels (0-7.5%, flour substitution) were investigated. The addition of 7.5% SHP slightly decreased diameter of biscuit and thickness was decreased as SHP at levels of 2.5-7.5% was incorporated. Hardness and fracturability of biscuit decreased as the levels of SHP was higher than 1.25 and 2.5%, respectively. Surface of biscuit became more reddish and yellowish as SHP was added. The addition of 5% SHP increased likeness score of resulting biscuit. Fortification of SHP affected the viscoelastic properties of dough. Deformation resistance and strength of dough decreased with increasing levels of SHP. Additional volatile compounds including aldehyde, ketone, alkane and ether, were detected when 5% SHP was incorporated, thus more likely contributing to odor and flavor of resulting biscuit. The addition of 5% SHP into biscuit resulted in the increased protein content with reduction of carbohydrate. Therefore, the biscuit could be fortified with 5% SHP and had higher nutritional value and increased sensory properties.

Ultrasound assisted extraction of antioxidative phenolics from cashew (Anacardium occidentale L.) leaves.

Optimization of ultrasound-assisted extraction (UAE) of antioxidative phenolics from the leaves of cashew (Anacardium occidentale L.) was carried out by response surface methodology along with the central composite design. Two independent variables were considered: amplitude (30-77%) and time (7-31 min). The highest extraction yield was 23.61% when the optimal extraction condition (77% amplitude for 31 min) was implemented. The extract containing total phenolic content of 579.55 mg GAE/g dry extract possessed radical scavenging activities and reducing power. The experiment values were in line with the predicted counterparts. Extract contained gallic acid, isoquercetin, tannic acid, quercetin, catechin, apigenin, hydroquinin, eriodictyol, and rutin. The extract with increasing levels inhibited AAPH-induced DNA damage to a higher extent. Thus, UAE was demonstrated to potentially increase the extraction efficacy of phenolics from cashew leaves and the extract could be applied as a natural antioxidant.