Investigation of oxidative, microbial and sensory quality changes of fish burgers enriched with pomegranate seed extract

Abstract

In this study, it was aimed to investigate the changes in oxidative, microbial and sensory quality of trout (Oncorhynchus mykiss) burgers enriched with pomegranate seed extract in different concentrations (0.5, 1%) during 15 days storage at 4 ±1 ^oC. According to the results, lower peroxide and TBARS values were found and oxidative degradation was delayed in trout burgers prepared with pomegranate seed extract. Total mesophilic and psychrophilic bacteria count, total coliform bacteria count, total number of yeast-mold and the lactic acid bacteria counts were found to be significantly lower (P<0.05) in the groups prepared with addition of pomegranate seed extract than the control group. In particular, microbial growth was significantly suppressed in the group supplemented with 1% extract concentration. According to sensory evaluation results, the control group was rejected by panellists on 6 days of the storage, while pomegranate seed extract added groups were rejected on 15 days of the storage. Considering the antioxidant and antimicrobial properties of pomegranate seed extract with delaying spoilage and increasing shelf life as 9 days, it may be tought that the seeds can be used as an alternative natural food preservative in the food industry.

Keywords

• Fish burger
• Pomegranate seed extract
• Oxidative spoilage
• Microbial spoilage

Nar çekirdeği ekstraktı ile zenginleştirilmiş balık burgerlerin oksidatif, mikrobiyal ve duyusal kalite değişimlerinin incelenmesi

Öz

Bu çalışmada farklı konsantrasyonlarda (%0.5 ve %1) nar çekirdeği ekstraktı ile zenginleştirilen alabalık (Oncorhynchus mykiss) burgerlerinin soğukta (4 ±1 ⁰C) 15 gün boyunca depolanması sırasında oksidatif, mikrobiyal ve duyusal kalitesinde meydana gelen değişimlerin incelenmesi amaçlanmıştır. Elde edilen sonuçlar doğrultusunda nar çekirdeği ekstraktı ile hazırlanan alabalık burgerlerinde daha düşük peroksit ve TBARS değerleri bulunmuş ve oksidatif bozulma geciktirilmiştir. Toplam mezofilik ve toplam psikrofilik bakteri sayısı, toplam koliform bakteri sayısı, toplam maya-küf sayısı ve toplam laktik asit bakterileri sayısı nar çekirdeği ekstraktı ilave edilerek hazırlanan gruplarda kontrol grubuna göre önemli düzeyde (P<0.05) düşük bulunmuştur. Özellikle %1 konsantrasyonda ekstrakt ilave edilen grupta mikrobiyal gelişim önemli düzeyde baskılanmıştır. Duyusal değerlendirme sonuçlarına göre kontrol grubu depolamanın 6. gününde panelistler tarafından reddedilirken, nar çekirdeği ekstraktı ilaveli gruplar depolamanın 15. gününde reddedilmiştir. Tüm sonuçlar doğrultusunda nar çekirdeği ekstraktının antioksidan ve antimikrobiyal özellik göstererek alabalık burgerlerinde bozulmayı geciktirdiği ve raf ömrünü 9 gün arttırdığı göz önünde bulundurulduğunda gıda endüstrisinde alternatif doğal koruyucu katkı maddesi olarak kullanılabileceği düşünülmektedir.  

Anahtar Kelimeler

• Balık burger
• Nar çekirdeği ekstraktı
• Oksidatif bozulma
• Mikrobiyal bozulma

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