Difference of physico-chemical properties of red wines in polyethylenterephtalate and bag in box packaging

Abstract

Studies have shown that the type of packaging can affect the quality and physico-chemical features of foods stored over a longer period of time. Important physico-chemical characteristics of wines that can change over a storage period are alcoholic strength, the amount of acidity or sulfur dioxide, relative density of wines or total dry extract. The aim of this paper was to determine and compare the physico-chemical properties of red wines (Cabernet sauvignon, Frankovka, Merlot and Pinot noir), stored over a period of one year in two different types of packaging (polyethylene terephthalate and bag-in-box). Relative density of wine, total dry extract, alcoholic strength, total acidity content, volatile acidity content, free and total sulfur dioxide content were determined after 3, 6 and 12 months of storage. The results showed that total and free sulfur dioxide content decreased over time in all wines. Volatile acidity and total acidity content increased over time. Alcoholic strength and total dry extract remained mostly stable. Relative density of wine decreased with time. There were no observed differences of these parameters in wines packed in polyethylene terephthalate and bag-in-box containers. Statistical multiple regression confirmed latter assertion.

Keywords

• physico-chemical properties
• polyethyleneterephthalate
• bag-in-box
• red wines