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Related Concept Videos

Adhesion01:14

Adhesion

Adhesion occurs when one type of molecule is attracted to a different molecule. Water exhibits adhesive properties in the presence of polar surfaces, such as glass or cellulose in plants. For instance, when water is poured into a glass, the positively charged hydrogen molecules of water are more attracted to the negatively charged oxygen molecules in the silica than to the oxygen in neighboring water molecules.
Capillary action is a result of water’s adhesive tendencies. When a narrow glass...

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Engineered nanoparticle adhesion and removal from tomato surfaces.

Mahmoudreza Ovissipour1, Shyam S Sablani, Barbara Rasco

  • 1School of Food Science, Washington State University , Pullman, Washington 99164, United States.

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|October 2, 2013
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Washing food with deionized water can remove some engineered nanoparticles (NPs), but effectiveness depends on the NP type and washing conditions. Alumina NPs were removed, but titania and silica NPs remained on tomato surfaces.

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Area of Science:

  • Environmental Science
  • Food Safety
  • Materials Science

Background:

  • Engineered nanoparticles (NPs) possess unique properties valuable in various industries.
  • Potential toxicity of NPs raises public health and environmental contamination concerns.
  • Understanding NP behavior on food surfaces is crucial for risk assessment.

Purpose of the Study:

  • To investigate the removal efficiency of different NPs from cherry tomato surfaces using deionized water washing.
  • To determine the influence of NP concentration and physicochemical properties (isoelectric point, hydrodynamic size) on removal efficacy.
  • To assess the impact of washing solution pH relative to NP isoelectric point (IEP) on removal.

Main Methods:

  • Contamination of cherry tomatoes with titania (TiO2), silica (SiO2), and alumina (Al2O3) NPs at two concentrations (50 and 500 μg mL(-1)).
  • Washing treated tomatoes with deionized water (DI).
  • Characterization of NP properties (surface charge, hydrodynamic diameter, IEP).
  • Quantification of NP concentration on tomato surfaces using Inductively Coupled Plasma Mass Spectrometry (ICP-MS).

Main Results:

  • Higher NP concentrations (500 μg mL(-1)) resulted in greater surface contamination.
  • Alumina (Al2O3) NP levels significantly decreased after DI washing.
  • Titania (TiO2) and silica (SiO2) NP concentrations showed no significant reduction post-washing.
  • NP removal was more effective when the pH difference between the washing solution and the NP's IEP was substantial.

Conclusions:

  • Simple deionized water washing can remove certain engineered nanoparticles from food surfaces.
  • The effectiveness of NP removal is NP-specific and influenced by their physicochemical properties, particularly their isoelectric point.
  • Optimizing washing conditions, such as pH, is critical for efficient removal of potentially harmful NPs from food models.