Journal of the Korean Physical Society

, Volume 71, Issue 10, pp 670–678 | Cite as

Optical and biological properties of plasma-treated Neurospora crassa spores as studied by absorption, circular dichroism, and Raman spectroscopy

  • Geon Joon LeeEmail author
  • Gyungsoon Park
  • Eun Ha Choi


We studied the effect of plasma treatment on the optical, structural and biological properties of Neurospora crassa (N. crassa) spores. An atmospheric-pressure plasma jet (APPJ) was used to generate reactive oxygen and nitrogen species in aqueous solution. The APPJ treatment of N. crassa spores in water significantly reduced the viability of spores. The reduction in the spore viability can be attributed to the reactive species from the plasma itself and those derived from the reaction of plasma radicals with aqueous solution. These structural modifications were contingent on the medium in which N. crassa spores were suspended; plasma treatment of N. crassa spores in PBS did not significantly affect the viability of spores as compared with N. crassa spores in water. Scanning electron microscopy images and circular dichroism spectra indicated that the spore cell wall was damaged by plasma treatment. The optical absorption spectrum of untreated N. crassa spores exhibited two resonance absorption bands at approximately λ1 ≈ 260 nm and λ2 ≈ 472 nm, originating from deoxyribonucleic acid (DNA) and β-carotene. The Raman spectrum of untreated N. crassa spores exhibited three main peaks at 1519, 1157 and 1006 cm −1, attributed to β-carotene inside the cell wall. The Raman spectra showed that the APPJ treatment of N. crassa spores in water caused degradation of β-carotene, affecting the viability of spores.


Atmospheric-pressure plasma jet Reactive oxygen species Neurospora crassa β-carotene Raman spectroscopy Circular dichroism spectroscopy 


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Copyright information

© The Korean Physical Society 2017

Authors and Affiliations

  1. 1.Department of Electrical and Biological Physics /Plasma Bioscience Research CenterKwangwoon UniversitySeoulKorea

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