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Juicing Technique Could Influence Healthfulness of Fresh Squeezed Juice

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With the New Year, many people are making resolutions to eat healthier, by eating more vegetables, for example. But those who don’t like the taste or texture of some vegetables might prefer to drink them in a home-squeezed juice. Now, researchers reporting in ACS Food Science & Technology have found that the choice of household juicing technique can influence the phytochemical content and antioxidant activity of common vegetable juices.

Home juicing machines have become popular in recent years, with different types available. For example, blenders crush vegetables with fast, spinning blades, and the resulting juice is typically thick, with much pulp and dietary fiber. In contrast, high-speed centrifugal juicers quickly pulverize veggies and separate out pulp and fiber, making for a thinner juice. Low-speed juice extractors squeeze juice with a horizontal auger that rotates vegetables at a low speed, producing the least heat of the three methods and also removing pulp and fiber.

Juicing can alter the levels of health-promoting phytochemicals and antioxidants in raw vegetables by exposing inner tissues to oxygen, light and heat and releasing enzymes. Therefore, Junyi Wang, Guddadarangavvanahally Jayaprakasha and Bhimanagouda Patil at Texas A&M University wanted to compare the phytochemical and antioxidant contents of 19 vegetables juiced with these three techniques.

After preparing juices with the different methods, the researchers observed that, in general, blending produced juices with the lowest amounts of some beneficial compounds, such as vitamin C, antioxidants and phenolics, probably because the technique produced the most heat. Low-speed juicing generated the highest amounts of beneficial compounds, although exceptions were found for certain vegetables. However, likely because of their higher fiber content, blended vegetable juices had the highest amounts of α-amylase inhibitors, which could help reduce hyperglycemia after a meal.

The researchers then used mass spectrometry and chemometrics to identify and quantify 85 metabolites in juices prepared by the three methods, finding that the low-speed juicer produced more diverse metabolites than the other two methods, but the relative abundances for the three juicing methods differed based on the veggie type. Therefore, different vegetables and juicing methods could produce unique health benefits, the researchers say.

American Chemical Society

Journal article

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