Combined impacts of oregano extract and vacuum packaging on the quality changes of frigate tuna muscles stored at 3±1°C

Aim: The combined effects of oregano extract with vacuum packing (VP) on the quality enhancement of dark and white muscles of frigate tuna (Auxis thazard) stored as intact fillet at refrigerated (3±1°C) conditions were studied. Materials and Methods: About 35 kg of fish were filleted without skin removal and randomly divided into two groups. One group without treatment (control) and the remaining group were dipped in a sterilized oregano extract solution for 5 min. Chemical, microbiological, sensorial, and textural analyses were carried out in each of dark and white muscles of frigate tuna fillets during storage. Results: Several quality indexes were higher in dark muscle than white muscle. The sensory assessment indicated that both muscles from control had a shelf life of 12 days. Quality parameters of both muscles had the same tendency and were significantly affected by time and also by the presence of plant extract in VP. Although VP alone was sufficient to delay lipid oxidation on fish fillets, especially on dark muscle but cannot enhance the textural deterioration in both muscles. Conclusion: Consequently, the employment of such combination had a cumulative effect on preservation, resulting in prolonging the shelf life of both frigate tuna muscles

The effects of edible oil nanoemulsions on the chemical, sensory, and microbiological changes of vacuum packed and refrigerated sea bass fillets during storage period at 2 +/- 2 degrees C

WOS: 000494414700001The quality of vacuum packed sea bass fillets treated with nanoemulsions based on commercial oils (hazelnut oil, corn oil, canola oil, soybean oil, olive oil, and sunflower oil) at 2 +/- 2 degrees C was evaluated by sensory, chemical (thiobarbituric acid reactive substances, peroxide value, total volatile basic nitrogen, and free fatty acids), and microbiological (total psychrophilic bacteria, total Enterobacteriaceae counts, total mesophilic aerobic bacteria, and total lactic acid bacteria) methods. The chemical parameters of fillets treated with the nanoemulsions presented lower values than those of the control group. Microbiological assessment correlated with sensory analyses. The use of nanoemulsions extended shelf life of fish, 4 days for canola, corn, soybean, and hazelnut oils and 2 days for olive and sunflower treatment groups. The quality of chemical, sensory, and microbiological parameters of sea bass fillets was increased with the application of oil nanoemulsions as well as their shelf life. Practical applications Nanomulsions have been paid attention since they are known as ideal carrier for the delivery of lipophilic substances because of small particle size, the ease of preparation, high bioavailability, and long-term stability. They are also proven to be self-preserving antimicrobials due to the bound water in their structure and restricted available water to microorganisms. Nanoemulsion has been shown to extend the shelf life of different species of fish by lowering the value of biochemical parameters and also inhibiting microbial growth.Turkiye Bilimsel ve Teknolojik Arastirma KurumuTurkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK) [TOVAG-113O379]Turkiye Bilimsel ve Teknolojik Arastirma Kurumu, Grant/Award Number: TOVAG-113O37

Combined effects of plant and cell-free extracts of lactic acid bacteria on biogenic amines and bacterial load of fermented sardine stored at 3 +/- 1 degrees C

WOS: 000438140400017Effects of cell-free extracts (CFE, 8%) prepared using Lactobacillus plantarum FI8595 or Pediococcus acidolactici ATCC 25741 alone or in combination with thyme and laurel extracts (0.5%) on physical, sensory, microbiological and chemical quality of fermented and vacuum packaged sardine fillets were investigated during 8 wk of chilled storage (3 +/- 1 degrees C). Sardine fillets were divided into 7 groups with the control being untreated. The other groups were treated with CFE of Lb. plantarum (LP group) and P. acidolactici (PA group). In addition, thyme with LP CFE (THLP) or PA CFE (THPA); and laurel with LP CFE (LALP) or PA CFE (LAPA) were also prepared. According to the sensory and physical assessment, shelf life of fermented fish was 5 wk for the control, 6 wk for LP, PA, LALP and LAPA, and 7 wk for THPA and THLP, although chemical and microbiological results exhibited longer shelf life. THPA and THLP had the lowest bacterial growth and TBA values. TVB-N values remained below 35 mg/100 g until 7 wk for all groups. THPA significantly reduced TMA formation. The study suggested that cell-free extracts of Lb. plantarum and P. acidolactici with thyme extract was the most effective way to improve the shelf-life of fermented sardines stored at chilled temperature.Scientific Research Projects Unit of Cukurova UniversityCukurova University [SUF2012BAP6]The authors would like to thank the Scientific Research Projects Unit of Cukurova University for their financial support (Research Project: SUF2012BAP6)

Effects of citrus essential oils on the oxidative stability of microencapsulated fish oil by spray-drying

The effects of citrus essential oils (orange, lemon, mandarin, and grapefruit) on the oxidative stability of microencapsulated fish oil by spray-drying were evaluated. The encapsulation efficiency of microcapsules was in the range of 42.25 and 62.43%. Twelve active substances were determined as major volatile components of citrus essential oils. The highest phenolic content was obtained from grapefruit essential oil (44.32 mg GAE/g). Lower values of thiobarbituric acid reactive substances (TBARs) were obtained for microencapsulated fish oils with essential oils compared to control. At the end of storage, the highest peroxide value (PV) was observed in the control group (25.30 meq O2/kg oil) while the lowest value was in the lemon (13.40 meq O2/kg oil) and orange group (13.91 meq O2/kg oil). The results of this study showed that citrus essential oils can be used to improve the oxidative stability of fish oil microcapsules

Remembering the Basics: A Patient with Sickle Cell Disease and Proteinuria

Patients with sickle cell disease (SCD) tend to develop many renal abnormalities, including concentration defect, renal papillary necrosis, and glomerulopathy that often presents with proteinuria. We report a case of a patient who presented with sickle cell crisis and proteinuria. A diagnosis of SCD glomerulopathy was confirmed with renal biopsy. Treatment with angiotensin-converting enzyme inhibitor was initiated, and proteinuria rapidly reduced to 0.27 g/day. It is crucial for a clinician to recognize this important complication and take necessary precautions to delay progression to end-stage renal disease