Comparison of Sugar Content in Bottled 100% Fruit Juice versus Extracted Juice of Fresh Fruit

This paper presents findings of an experiment for the comparison of sugar concentration in extracted juice of fresh fruit to that of commercially-bottled 100% fruit juice with a “no sugar added” attribute. The goal of the study was to determine if the sugar content of bottled 100% fruit juice with a “no sugar added” label is equivalent to that of extracted juices of fresh fruits. The reported study was performed to address the potential concern that commercially-bottled 100% fruit juices with “no sugar added” may contain higher sugar content than extracted juice of fresh fruit. The fruit juices that were tested included apple, grapefruit, orange, pineapple, pomegranate, red grape and white grape. All bottled juices and fresh fruits were purchased in Toledo, Ohio, USA during the winter of 2012. The fresh fruits were juiced and three samples were tested for sugar concentration using a Brix refractometer. The same testing protocol was also applied to the bottled 100% fruit juice. Application of the Mann-Whitney test on the experimental data demonstrated no statistically significant difference (p > 0.05). The results suggested that the sugar content in the commercially bottled 100% fruit juice with the “no sugar added” label is an accurate representation of sugar content in the freshly-extracted juice of the corresponding fruit.

不同PET瓶对100％橙汁质量的影响

聚对苯二甲酸乙二醇酯(PET)具有稳定、质轻、价廉等多种优点而作为饮料包装材料广为使用,但PET瓶的气体阻隔性较传统玻璃瓶差,因此,提高PET瓶的气体阻隔性、提升饮料产品品质是本研究的初衷。本研究通过以两种添加阻隔材料(加吸氧剂、内涂层)、一种多层PET瓶及普通PET瓶为包装容器,选择100%橙汁为研究对象,研究不同温度条件下,100%橙汁储藏过程中VC含量和颜色的变化情况,发现四种PET瓶对VC和色泽保持的顺序为:多层PET瓶>内涂层PET瓶>含吸氧剂PET瓶>普通PET瓶,且果汁产品应尽量在4℃存放。