求翻译：食物保鲜一直是食品研究领域的重要内容。普鲁兰多糖是一种健康的多糖，使用它进行食品保鲜可以很好的保证食物的新鲜度并且不影响营养价值是什么意思？

Food preservation has been an important part of the field of food research. Pullulan is a healthy polysaccharides, and use it for food preservation can guarantee the freshness of the food and do not affect the nutritional value

Food has always been an important area of food studies. Gunter, sugar is more than a healthy, more sugar, and use it for food preservation can be a good guarantee food freshness and nutritional value does not affect

Food maintains freshness always is the food research area important content.The Prew blue polysaccharide is one kind of healthy polysaccharide, and uses it to carry on food to maintain freshness may the very good guarantee food freshness not affect the nutritional value

Food preservation is an important content of food research. Pullulan polysaccharide is a health, use it for food preservation is a good guarantee of freshness and do not affect the nutritional value of food

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