Effect of Different Drying Procedures on the Nutritional Value of the Mantle and Tentacles of Sepia officinalis

Abstract

The aim of this work was to investigate the influence of two different drying methods, traditionally by sun and controlled temperatures of 45, 50, 60 and 70 °C and relative humidity of 20 and 30% on the chemical composition of Sepia officinalis. When compared to fresh samples, lipid content increased under both drying methods whereas protein levels significantly increased only under controlled conditions. Drying procedures increased the percentage of saturated fatty acids mainly in sun‐dried samples and at high temperature (70 °C). A significant decrease in the amount of polyunsaturated fatty acids was detected in sun‐dried samples. No significant differences were found between the levels of polyunsaturated fatty acids of fresh cuttlefish and those under controlled conditions. The highest value of malondialdehyde in mantles was observed in sun‐dried samples, while in tentacles the highest level was seen at 70 °C. The highest level of advanced oxidation protein products was noted in traditionally sun‐dried samples. The results obtained showed that 45–50 °C and 20–30% humidity conserved the value of proteins and lipids more than traditional drying. Results of this study may be suitable for developing a reliable industrial index.

Physicochemical, microstructural, and microbial qualities of dehydrated Tuna chunks: Effects of microwave power and drying methods

“…During sun drying, oxidation of fish lipids is facilitated by direct exposure to sunlight for a longer duration. Selmi et al (2010) compared the oxidative stability of silverside fish during sun drying and hot air drying and Tir et al (2017) compared the oxidation of sun-dried and hot air-dried cuttlefish. In both studies, significantly higher amounts of TBARS, PV, and free fatty acids were observed in sun-dried samples.…”

Differential Impact of Sex on Seasonal Changes in Mantle and Tentacle Phospholipids and Triacylglycerols inSepia officinalis

“…It presents high growth rates (Forsythe et al, 1994) and market price (FAO, 2008). In Tunisian coasts, little is known about S. officinalis and some works have discussed its systematic and reproduction cycle (Najai, 1983), genetic diversity (Tir et al, 2015a), chemical composition (Tir et al, 2015b), and also the effect of different drying procedures on the nutritional value (Tir et al, 2017).…”