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Related Experiment Videos

Effect of juice extractor settings on juice cloud stability.

R G Cameron1, R A Baker, B S Buslig

  • 1Citrus and Subtropical Products Laboratory, SAA, ARS, U.S. Department of Agriculture, P.O. Box 1909, Winter Haven, Florida 33883, USA. rcameron@asrr.arsusda.gov

Journal of Agricultural and Food Chemistry
|December 20, 1999
PubMed
Summary
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Orange juice cloud stability varies with extraction method, with soft-extracted juice being most stable. Pectinmethylesterase (PME) activity at pH 4.5 predicts stability, but not at pH 7.5.

Area of Science:

  • Food Science
  • Biochemistry

Background:

  • Juice cloud stability is crucial for consumer acceptance.
  • Extraction methods can influence juice properties.
  • Pectinmethylesterase (PME) activity is a key enzyme affecting juice quality.

Purpose of the Study:

  • To investigate the impact of different orange juice extraction settings on juice cloud stability.
  • To determine the role of protein extracts and PME activity in juice cloud stability.
  • To evaluate the reliability of PME activity measurements at different pH levels for predicting juice stability.

Main Methods:

  • Valencia oranges were juiced using three distinct extractor settings: soft, medium, and hard.
  • Protein extracts were isolated from each juice type and added to pasteurized juice.

Related Experiment Videos

  • Pectinmethylesterase (PME) activity was measured at pH 4.5 and pH 7.5.

    • Main Results:

    • Soft-extracted orange juice exhibited the highest cloud stability, while hard-extracted juice showed the least.
    • Protein extracts from different extraction methods differentially affected pasteurized juice cloud stability.
    • PME activity measured at pH 4.5 correlated with observed juice cloud stability.
    • PME activity measurements at pH 7.5 yielded inconsistent and unreliable results for predicting stability.

    Conclusions:

    • Orange juice extraction intensity significantly impacts juice cloud stability.
    • PME activity at pH 4.5 is a reliable indicator for predicting juice cloud stability.
    • PME activity estimation at pH 7.5 is not a reliable method for assessing juice cloud stability.