Some vegetables (e.g., potatoes, carrots) require peeling. There are several available peeling methods; at an industrial scale, however, vegetables are peeled mechanically, chemically, or with high-pressure steam peelers. In an each case, the peeling operation should be as gentle as possible. The ideal method is hand peeling with a sharp knife. Industrial peeling affects active compounds in fresh-cut vegetables. found increased levels of vitamin C retained in hand- prepared shredded iceberg lettuce relative to machine- peeled samples. Also, observed losses of 39% of quercetin in onions after peeling, trimming, and chopping. Such high losses of this flavonoid resulted from the removal of the first and second layers, which contain more than 90% of all quercetin in onions.
Some vegetables (e.g., potatoes, carrots) require peeling. There are several available peeling methods; at an industrial scale, however, vegetables are peeled mechanically, chemically, or with high-pressure steam peelers. In an each case, the peeling operation should be as gentle as possible. The ideal method is hand peeling with a sharp knife. Industrial peeling affects active compounds in fresh-cut vegetables. found increased levels of vitamin C retained in hand- prepared shredded iceberg lettuce relative to machine- peeled samples. Also, observed losses of 39% of quercetin in onions after peeling, trimming, and chopping. Such high losses of this flavonoid resulted from the removal of the first and second layers, which contain more than 90% of all quercetin in onions.
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