Changes in content and composition of dietary fiber in yellow onions and red delicious apples during commercial storage.
Changes in content and composition of dietary fiber in yellow onions and red delicious apples during commercial storage.
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DOI：
10.1093/jaoac/83.4.992
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发表时间：
2000-07
影响因子：
1.6
通讯作者：
J. Marlett;J. Marlett
中科院分区：
文献类型：
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作者：
J. Marlett;J. Marlett
果胶成分和溶解度的变化是苹果在成熟和采后贮藏过程中软化过程的一部分。长期储存也可能发生木质化。在美国，苹果和洋葱每年收获一次，然后在接下来的12个月里储存和销售。研究了红苹果和黄洋葱在贮藏过程中膳食纤维含量和组成的变化，并测定了去皮苹果的纤维损失量。采用鹿茸和鹿茸的酶化学法提取膳食纤维。贮藏对苹果总纤维和不溶性纤维含量没有影响；贮藏12个月的木质素浓度高于贮藏0、4、8个月的木质素浓度。果皮通过降低不溶性部分中的中性糖、酸性糖和木质素，使苹果纤维浓度降低约25%。洋葱总纤维含量随贮藏时间的增加而增加，主要是由于糖醛酸不溶性纤维含量的增加。结果表明，在华盛顿州使用的标准化、环境控制的苹果储存方法对膳食纤维含量几乎没有影响。相比之下，不严格控制的储存条件下，黄色西班牙洋葱的不溶性纤维含量和醛酸含量增加。
Changes in pectin composition and solubility are part of the softening process in apples during ripening and postharvest storage. Lignification may also occur with long-term storage. In the United States, apples and onions are harvested once yearly and then stored and marketed for the next 12 months. The changes that occur in the dietary fiber content and composition in Red Delicious apples and yellow Spanish onions during storage were studied, and the loss of fiber in peeled apples was determined. Dietary fiber was extracted by the enzymatic-chemical method of Theander and Westerlund. Storage had no effect on total or insoluble fiber content of apples; Klason lignin concentration was greater in samples stored for 12 months than in those stored for 0, 4, or 8 months. Peeling reduced apple fiber concentration about 25% by decreasing neutral and acidic sugars and Klason lignin in the insoluble fraction. The total fiber content of onions increased with storage, primarily by increasing the insoluble fiber content of uronic acids. The results suggest that the standardized, environmentally controlled storage of apples, as used in Washington State, has little effect on dietary fiber content. In contrast, the less rigorously controlled storage conditions for yellow Spanish onions increases the insoluble fiber fraction and uronic acid content.