Journals / Harran Tarım ve Gıda Bilimleri Dergisi / 2018 / Cilt: 22 - Sayı: 4

Effect of enzyme pretreatment on the physical and chemical properties, total phenolic content and total antioxidant capacity of black grape and raspberry juices

Enzim Ön Uygulamasının Siyah Üzüm ve Ahududu Sularının Fiziksel ve Kimyasal Özellikleri, Toplam Fenolik Madde İçeriği ve Toplam Antioksidan Kapasitesi Üzerine Etkisi

Pages
502–512
Publication Date
2018-12-24
DOI
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AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

For both juices, maximum yield increase was obtained when treated at 40°C with 0.5% enzyme concentration (For GJ 17% and for GJ 4%).

📌 3 Key Takeaways

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Objective & Hypothesis:In this study, the effect of enzyme pretreatment on the physical and chemical properties as well as total phenolic content (TP) and total antioxidant capacity (TAC) of black grape (GJ) and raspberry (RJ) juices were investigated.
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Key Findings & Data:After that, remaining pulp was added to obtained juice incubated for 1 hour at 40 and 50 °C after adding 0.1% (v/w) or 0.5% (v/w) pectinase enzyme.
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Conclusion & Impact:For both juices, maximum yield increase was obtained when treated at 40°C with 0.5% enzyme concentration (For GJ 17% and for GJ 4%).
🔬Design:Research Article
📍Scope:Comprehensive Sample
⚙️Variables:Meyve suyu · Enzim ön uygulaması · Üzüm

Abstract

In this study, the effect of enzyme pretreatment on the physical and chemical properties as well as total phenolic content (TP) and total antioxidant capacity (TAC) of black grape (GJ) and raspberry (RJ) juices were investigated. For this purpose, fruits were crushed and squeezed with a cheesecloth. After that, remaining pulp was added to obtained juice incubated for 1 hour at 40 and 50 °C after adding 0.1% (v/w) or 0.5% (v/w) pectinase enzyme. Titratable acidity, pH, brix, color difference, TP and TAC of the samples was determined. An increase in the temperature increased the pH of the RJ. For GJ, an increase in both temperature and enzyme increased the pH. Brix of the enzymatically treated RJ was increased comparing to control groups, but GJ. Heat application caused an increase in the total sugar content of GJ compared to control group. There was no significant difference on the TP and TAC values of the GJ and RJ treated at 40 °C comparing to control group treated at room temperature. However, a decrease was observed at 50 °C. For both juices, maximum yield increase was obtained when treated at 40°C with 0.5% enzyme concentration (For GJ 17% and for GJ 4%).

Özet

Bu çalışmada, enzim uygulamasının siyah üzüm (ÜS) ve ahududu sularının (AS) fiziksel ve kimyasal özellikleri, toplam fenolik madde içeriği (TF) ve toplam antioksidan kapasitesi (TAK) üzerine etkisi incelenmiştir. Meyveler ezilip tülbentten geçirildikten sonra posaları geri ilave edilmiş, %0.1 (v/w) veya %0.5 (v/w) pektinaz enzimi ilave edilerek 40 ve 50 °C’de 1 saat boyunca inkübe edildikten sonra örneklerin pH, titre edilebilir asitlik (TA), briks ve renk değişimleri ile TF ve TAK belirlenmiştir. ÜS pH’sı artan enzim konsantrasyonu ve sıcaklık ile, AS pH’sı ise artan sıcaklığa bağlı olarak artmıştır. Enzimatik işlem uygulanan AS briksleri kontrol gruplarına göre artış gösterirken ÜS briksleri azalmıştır. Isıl işlem ÜS şeker içeriğinde kontrol grubuna göre artışa neden olmuştur. 40 °C’de ÜS ve AS’nin TF ve TAK değerleri oda sıcaklığına göre önemli bir değişiklik göstermezken, 50 °C’de düşüş göstermiştir. Her iki meyve örneği için 40°C’de %0.5 enzim ilave edildiğinde maksimum meyve suyu verimi elde edilmiştir (ÜS için %17, AS için %4).

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Cite This Article

AYDIN, E., SARIKAYA, Ö., ÇATALKAYA, G., KAHVECİ, D. (2018). Effect of enzyme pretreatment on the physical and chemical properties, total phenolic content and total antioxidant capacity of black grape and raspberry juices. Harran Tarım ve Gıda Bilimleri Dergisi, Cilt: 22 - Sayı: 4, 502–512. https://ajindex.com/articles/423062

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