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Inhalable dust and protein exposure in soybean processing plants.

Adri Spies1, David Rees, Anna M Fourie

  • 1National Institute for Occupational Health, South Africa. adri.spies@nioh.nhls.ac.za

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Inhalable dust in southern African soybean plants was measured. Total protein may serve as a reliable indicator for soybean-specific proteins, despite no direct correlation found with soy trypsin inhibitor.

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Area of Science:

  • Occupational Health
  • Environmental Science
  • Food Science

Background:

  • Inhalable dust exposure in soybean processing plants, particularly in southern Africa, is not well-documented.
  • Understanding dust composition is crucial for worker safety and product quality in soybean processing.

Purpose of the Study:

  • To quantify inhalable dust concentrations in southern African soybean processing plants.
  • To investigate the correlation between inhalable dust, total protein, and soy trypsin inhibitor levels.
  • To assess the potential of total protein as a proxy for soybean-specific proteins.

Main Methods:

  • Conducted 64 personal inhalable dust measurements across three processing plants.
  • Quantified total protein and soy trypsin inhibitor levels in samples from two plants.
  • Performed correlation analyses between dust levels, total protein, and soy trypsin inhibitor.

Main Results:

  • Inhalable dust levels ranged from 0.24-35.02 mg/m³ (median 2.58 mg/m³).
  • Total protein and soy trypsin inhibitor levels were measured at 29.41-448.82 µg/m³ (median 90.09 µg/m³) and 0.05-2.58 µg/m³ (median 0.07 µg/m³), respectively.
  • No significant correlation was found between inhalable dust and soy trypsin inhibitor; however, total protein and soy trypsin inhibitor showed a better correlation.

Conclusions:

  • Inhalable dust levels in these plants warrant attention for occupational health.
  • Total protein emerged as a potential surrogate marker for soybean-specific protein content.
  • Further research could refine the use of total protein as a monitoring tool in soybean processing environments.