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Al-Bachir M., 2017. Control of natural microorganisms in chamomile (Chamomilla recutita L.) by gamma ray and electron beam irradiation. Acta Sci.Pol. Technol. Aliment. 16 (1), 17-23

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original articleIssue 16 (1) 2017 pp. 17-23

Mahfouz Al-Bachir

Radiation Technology Department, Atomic Energy Commission of Syria

Control of natural microorganisms in chamomile (Chamomilla recutita L.) by gamma ray and electron beam irradiation

Abstract

Background. Microbial contamination levels and corresponding sensitivities to gamma rays (GR) and elec- tron beam (EB) irradiation were tested in chamomile (Chamomile recutta L.).

Material and methods. Chamomile powders were treated with 10 and 20 kGy by GR and EB, respectively. Microbiological and chemical analyses were performed on controls and treated samples immediately after irradiation, and after 12 months of storage.

Results. The control samples of chamomile exhibited rather high microbiological contamination, exceeding the levels of 4 log10 CFU g-1   (CFU – colony forming units) reported by national and international authorities as the maximum permissible total count level. Irradiation with GR and EB was found to cause a reduction in microbial contamination proportionate to the dose delivered. The sterilizing effect of EB on microorganisms was higher than the GR one. A dose of 10 kGy of GR and EB significantly (p < 0.05) reduced the total bacte- rial, total coliform and total fungal contamination. A dose of 20 kGy of GR significantly (p < 0.05) reduced the total bacterial and total fungal contamination, while a 20 kGy dose of EB reduced the initial bacterial, total coliform and total fungal contamination to below detection level when the analysis was carried out im- mediately after irradiation treatment or after 12 months of storage.

Conclusion. The comparative study demonstrated that electron beam was more effective for decontamination of chamomile powder than gamma irradiation.

Keywords: chamomile, decontamination, electron beam, gamma ray, moisture storage
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http://dx.doi.org/10.17306/J.AFS.2017.0410

For citation:

MLA Al-Bachir, Mahfouz. "Control of natural microorganisms in chamomile (Chamomilla recutita L.) by gamma ray and electron beam irradiation." Acta Sci.Pol. Technol. Aliment. 16.1 (2017): 17-23. http://dx.doi.org/10.17306/J.AFS.2017.0410
APA Al-Bachir M. (2017). Control of natural microorganisms in chamomile (Chamomilla recutita L.) by gamma ray and electron beam irradiation. Acta Sci.Pol. Technol. Aliment. 16 (1), 17-23 http://dx.doi.org/10.17306/J.AFS.2017.0410
ISO 690 AL-BACHIR, Mahfouz. Control of natural microorganisms in chamomile (Chamomilla recutita L.) by gamma ray and electron beam irradiation. Acta Sci.Pol. Technol. Aliment., 2017, 16.1: 17-23. http://dx.doi.org/10.17306/J.AFS.2017.0410