The Effect of Corn Zein Edible Film Coating on Intermediate Moisture Apricot (Prunus Armenica L.) Quality (in English)

Abstract

Intermediate moisture apricots were produced from sun dried natural apricots which were dipped into a 2.5% citric acid solution at 80 oC for 3 minutes. Intermediate moisture apricots were coated with different formulations of natural corn protein “zein” films by dipping treatment. The potential of antimicrobial and antioxidant agents in edible zein film and the coating effects to maintain the quality of intermediate moisture apricots has been investigated during 10 months storage at 5 and 20 oC. Colour change was reduced remarkably by coating process. The control fruits presented higher values of a*/b* (1.0±0.1) than the coated fruits (0.7±0.2). ∆E value of coated samples was found to be 7.9±1.1 at the end of storage period where it was identified as 13.8±0.6 for control samples . Total viable bacteria count of control group was found significantly higher than zein film coated samples (P<0.05). Coating with zein film inhibited microbial growth to the extent of around 2　log between control and coated batches. Higher storage temperature caused higher moisture loss from samples , however no significant difference was found between different coating formulations on moisture loss. 

Keywords

•  edible film, corn zein, ascorbic acid, sorbic acid, intermediate moisture apricot

Yenilebilir Mısır Zeini Filmi Kaplamanın Orta Nemli Kayısı (Prunus Armenica L.) Kalitesine Üzerine Etkisi (İngilizce)

Abstract

Güneşte kurutulmuş naturel kayısıların %2.5 sitrik asit çözeltisine 80 oC de 3 dk daldırılması ile orta nemli kayısı örnekleri üretimi gerçekleştirilmiştir. Orta nemli kayısılar farklı zein film formülasyonları içeren çözeltilere daldırılarak kaplanmıştır. Antimikrobiyal ve antioksidant maddelerin zein film içerisine eklenmesinin etkilerinin araştırılması ve depolama süresince kaplamanın orta nemli kayısı üzerine etkisinin belirlenmesi amacıyla ürünler 10 ay süresince 5 ve 20 oC sıcaklıklarda depolanmıştır. Kayısılarda depolama sırasında oluşan renk değişimi önemli ölçüde kaplama işlemi ile azaltılmıştır. Kontrol örnekleri için a*/b* (1.0±0.1) değeri kaplanmış örneklerin a*/b* (0.7±0.2) değerinden yüksek bulunmuştur. Depolama süresi sonunda ∆E değerleri ise kaplanmış örneklerde 7.9±1.1 iken kontrol örnekleri için bu değer 13.8±0.6 olarak belirlenmiştir. Kontrol grubu örneklerin toplam canlı sayımı zein film ile kaplanmış örneklere göre istatistiksel anlamda yüksek bulunmuştur (P<0.05). Kaplanmış örneklerle kontrol grubu örnekler arasında 2　log düzeyinde farklılık oluştuğu belirlenmiştir. Yüksek depolama sıcaklıklarının nem kaybını arttırdığı ancak farklı kaplama formülasyonları arasında önemli bir farklılık olmadığı bulgulanmıştır.

Keywords

• Yenilebilir film, zein, sorbik asit, askorbik asit, orta nemli kayısı　　

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