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Food preservative additives are natural or synthetic substances which delay degradation in foods caused by microbial growth, enzyme activity, and oxidation. Until recently, the use of synthetic additives in food was more common. However, synthetic additives have not been widely accepted by consumers in recent years due to their assumed adverse effects on their health. Therefore, the tendency of consumers to natural additives is increasing day-by-day. Seafood is an easily perishable food due to its chemical composition. Immediately after harvest, changes in odor, taste, and texture in fishery products can be noticed. For this reason, measures to protect the product must be taken immediately after harvest or catching. Various preservation methods have been developed. In addition to various technological methods, preservative additives are used in fresh or processed seafood as well as in other foods. This review focuses on novel natural preservatives from different sources such as plants, bacteria, fungi, animals and algae, and their use in seafood to protect quality and prolong shelf life. © 2018 Society of Chemical Industry.

The use of protein restructuring enzyme transglutaminase (TGase) for extending the shelf-life of rainbow trout mince was determined during refrigerated storage. TGase added into the fish mince in the proportions of 0.0%, 0.2%, 0.5% and 1.0% and the quality alterations were evaluated in terms of chemical, microbiological and sensory parameters. The scores of TVB-N and TIVIA-N, fish spoilage indicators, of the fish mince treated with TGase had lower levels than control samples. It was recorded that the progress in total free amino acids was suppressed with the addition of TGase. The increase in enzyme concentration met successful results in hindering the growth of total psychrophilic bacteria and coliform bacteria. The best results were obtained with the addition of TGase in the concentration of 1.0%. Overall, utilization of TGase can be a useful tool for seafood processing technology to achieve products with extended shelf life. (C) 2017 Elsevier Ltd. All rights reserved.

The aim of this study was to investigate the effects of tumbling on the physicochemical and textural characteristics of squid (Loligo vulgaris), octopus (Octopus vulgaris) and cuttlefish (Sepia officinalis) muscles. Before tumbling the cephalopod samples were placed in plastic bags and 0.5 M NaCl was added. Tumbling process was performed continuously in three different tumbling times (2, 4, and 6 h). The results of the analyses showed that tumbling affected the physicochemical properties of cephalopod muscles. The increase in the time of tumbling resulted in the tenderness of the cephalopod muscles. The total soluble protein, the total free amino acid, and pH values increased with the increase of the tumbling time. The water holding capacity decreased and the cooking loss increased. The squid and octopus hardness and shear force values decreased after tumbling, according to instrumental and sensorial texture measurements. As a result, tumbling was found to be an effective method for tenderizing of squid and octopus muscle, but not for cuttlefish.

The aim of this study was to investigate the effects of bromelain and papain enzymes for tenderizing of squid (Loligo vulgaris) muscle. Squid samples were immersed into the enzyme solutions and then they were kept in a water bath at 60 degrees C for 20 min to activate enzymes. After enzyme treatment, pH values, hardness and shear force values of squid muscle decreased. Total protein, free amino acid contents and sensory scores increased. Use of bromelain and papain enzymes was found as effective method to tenderize of squid muscle. Better results were obtained with papain compared to bromelain.

This research aimed to inhibit the oxidation of fish lipid by adding the ethanol extracts of albedo and flavedo fragments of grapefruit, sour orange, and bergamot. The samples were stored at 25°C, ...

Inhibitory effects of high pressure processing (HPP) on the biogenic amine formation (histamine, tyramine, putrescine and cadaverine) in marinated herring fillets (2% acetic acid+8% NaCl; or 4% acetic acid+8% NaCl solutions) were investigated. Marinated fillets were inoculated with M. psychrotolerans followed by vacuum-packaging and HPP treatment at 100, 300 and 500 MPa for 5 and 10 min. One batch was left untreated for each marination group and the batches were stored at 4 °C for 3 months. HPP in combination with 4% acetic acid had a strong inhibitory effect on the growth of M. psychrotolerans, since there was no growth in samples treated with 300 MPa for 10 min and 500 MPa for 5, 10 min. Psychrophilic bacteria growth was not detected in samples marinated with 4% acetic acid and treated with 500 MPa H2S-producing bacteria were not observed in marinated herring during the storage period. Histamine and cadaverine formation were not observed in the samples marinated with 4% acetic acid along the storage. Taken together, the findings of this research might be helpful to enhance the safety of consumption of marinated herring. © 2018 Elsevier Ltd, Deutscher Akademischer Austauschdienst Firat University Scientific Research Projects Management Unit, This research was supported by the Scientific and Technological Research Council of Turkey (TUBITAK), Deutscher Akademischer Austauschdienst (DAAD) and The Scientific Research Projects Administration Unit of Akdeniz University under project no. FDK-2015-273 . The authors thank to management and staff of Deutsches Institut für Lebensmitteltechnik (German Institute of Food Technologies) for providing opportunity to work and infrastructure.

Herring fillets were inoculated with Photobacterium phosphoreum and Morganella psychrotolerans, vacuum packed and subjected to high-pressure processing (HPP) treatment (100, 200, 300, and 500 MPa for 5 min) or left untreated as controls. The samples were stored at 4 ± 1 °C up to 21 days, and subjected to microbial quality evaluation. The results revealed that 500 MPa pressure treatment significantly (p .05) affect the microbial growth of vacuum-packed herring fillets, but further higher pressure levels (300–500 MPa) were effective to inhibit the growth of microorganisms. Overall, the findings of this study suggested that HPP application of 300 MPa and above could help to industry for commercial production of microbiologically free fish and fish products. © 2018 Wiley Periodicals, Inc, Deutscher Akademischer Austauschdienst Deutscher Akademischer Austauschdienst, Deutscher Akademischer Austauschdienst; Scientific and Technological Research Council of Turkey, This research was supported by the Scientific and Technological Research Council of Turkey (TUBITAK) and Deutscher Akademischer Austauschdienst (DAAD). The authors thank to the management and the staff of Deutsches Institut für Lebensmitteltechnik (German Institute of Food Technologies) for providing opportunity to work and infrastructure.

This study describes the potential use of olive oil-lemon juice emulsions containing different levels of lemon juice (0, 25, 35, and 50% v/v) as a flavoring, preservative, and antioxidant agent in marinated anchovy. The phenolic content and antioxidant activity of lemon juice, olive oil, and olive oil-lemon juice sauces as well as chemical, oxidative, and sensorial changes of marinade samples were analyzed. Increasing the level of lemon juice in sauces retarded the chemical and oxidative changes of marinated anchovy. However, increasing the level of lemon juice more than 35% in sauces led to a decrease in sensorial acceptability. Chemical and oxidative qualities of all the sauced samples were in the limit of deterioration during 100 days of storage. Although marinated anchovy samples treated with sauce containing 50% lemon juice had a significant inhibitor effect on chemical and oxidative deterioration, samples treated with sauce containing 35% lemon juice received the highest overall acceptabilit...

In this study, shrimp (Aristeus antennatus) immediately after trawling was treated with plant extracts (rosemary and green tea), sodium metabisulphite solution, and their combinations. After dipping into the solutions, melanosis and selected quality changes of shrimp were investigated during the storage at 4°C. Plant extracts were found effective in delaying melanosis in shrimp. Combinations of sodium metabisulphite and plant extracts were found more effective than those groups separately treated with plant extracts. Plant extracts, sodium metabisulphite, and combinations showed lower trimethylamine and total volatile nitrogen values as compared to the control group. It is concluded that use of plant extracts decreased the need for sodium metabisulphite.

The aim of this study was to investigate the effects of freezing and frozen storage on protein functionality and texture of squid (Loligo vulgaris), octopus (Octopus vulgaris), and cuttlefish (Sepia officinalis) muscles. Squid, octopus, and cuttlefish samples were cut into pieces of 4x4cm. These pieces were packed in polyethylene bags. The bags were frozen in a blast freezer at -45 degrees C until the thermal center reached -18 degrees C. Frozen samples were stored in a deep freezer at -18 degrees C for 30days. After freezing and during frozen storage, total soluble protein and water holding capacity decreased and total free amino acid and cooking loss increased in all cephalopod muscles. According to instrumental texture analysis results, freezing and frozen storage affected textural characteristics of squid and cuttlefish but not of octopus. Sensory hardness and chewiness values of all cephalopods increased after freezing, but elasticity values did not change. There were no significant differences between storage days in hardness values of squid and octopus. However, significant differences in hardness values of cuttlefish were observed between the 1st day of storage and the last day.

Response surface methodology was used to investigate the effect of ultrasound-assisted extraction conditions including solvent:seaweed ratio (10:1–30:1), extraction temperature (30–50°C), and extraction time (30–60 min) on the total phenolic compounds and antioxidant activity of red seaweed (Laurencia obtuse) extracts. The optimum extraction parameters for maximum phenolic content were as follows: solvent:seaweed ratio, 30:1; extraction temperature, 50°C; and extraction time, 42.8 min. The experiment results showed that the solvent:seaweed ratio was the most significant parameter for the extraction. The optimum extraction conditions for maximum antioxidant activity were as follows: solvent:seaweed ratio, 24.3:1; extraction temperature, 45.3°C; and extraction time, 58 min. Under the above-mentioned conditions, the experimental total phenolic content and antioxidant activity value were 26.23 ± 0.75 mg GAE/g seaweed and 120.89 ± 0.81 TEAC, respectively, of seaweed tested, which are well compatible wi...