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Comparison between FTIR-ATR technique and traditional methods in discrimination of Bacillus isolates from some foods

مقارنة بين تقانة مطيافية تحويل فورييه للأشعة تحت الحمراء المزودة بوحدة الانعكاس الكلي المخفف و الطرائق التقليدية في تمييز بعض العزلات البكتيرية التابعة للجنس Bacillus من بعض الأغذية

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 Publication date 2014
  fields Food Sciences
and research's language is العربية
 Created by Shamra Editor




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Forty-five Bacillus isolates were obtained from different foods (spices, grains, dried milk), the isolates were identified using traditional method from Bergey's manual based on morphological tests (gram staining, spores staining), physiological tests (optimum growth temperature, pH, NaCl concentration) and biochemical tests (Voges-Proskauer, gelatin hydrolysis, esculin hydrolysis, β- Galactosidase test, Lysine decarboxylase and Ornithine decarboxylase, production of acid from different sugars). Bacterial suspensions were prepared from the isolates and FTIR spectrums were obtained using ATR unit, which consists of ZnSe prism, by scanning at the range of 4000-400 cm-1. Results revealed that the isolates represented 5 species of Bacillus (B. pumilus, B. subtilis, B. lentus, B. megaterium, B. cereus) and the potential of Fourier transform infrared spectroscopy-attenuated total reflectance (FTIR-ATR) method as a reliable method for discrimination among Bacillus isolates, which is accurate, rapid, easy to apply and cheap.


Artificial intelligence review:
Research summary
تتناول هذه الدراسة مقارنة بين تقانة مطيافية تحويل فورييه للأشعة تحت الحمراء المزودة بوحدة الانعكاس الكلي المخفف (FTIR-ATR) والطرائق التقليدية في تمييز بعض العزلات البكتيرية التابعة للجنس Bacillus من بعض الأغذية. تم الحصول على 45 عزلة من البكتيريا من أغذية مختلفة مثل البهارات والحبوب والحليب المجفف. تم تصنيف هذه العزلات باستخدام دليل Bergey والاختبارات الفيزيولوجية والبيوكيميائية. كما تم تحضير معلق بكتيري من العزلات للحصول على أطياف FTIR-ATR. أظهرت النتائج أن العزلات تنتمي إلى خمسة أنواع من Bacillus وهي B. pumilus وB. subtilis وB. lentus وB. megaterium وB. cereus. وأثبتت الدراسة أن تقانة FTIR-ATR هي طريقة موثوقة ودقيقة وسريعة وسهلة التطبيق ومنخفضة التكلفة لتحديد العزلات البكتيرية.
Critical review
دراسة نقدية: تعتبر هذه الدراسة خطوة هامة في مجال تمييز العزلات البكتيرية باستخدام تقانة FTIR-ATR. ومع ذلك، هناك بعض النقاط التي يمكن تحسينها. أولاً، قد يكون من المفيد تضمين عدد أكبر من العينات لزيادة دقة النتائج وتعميمها. ثانياً، يمكن تحسين وصف الإجراءات التجريبية لتكون أكثر وضوحاً وتفصيلاً، مما يسهل على الباحثين الآخرين تكرار الدراسة. وأخيراً، قد يكون من المفيد مقارنة نتائج FTIR-ATR مع تقانات أخرى حديثة لتحديد مدى تفوقها أو تكاملها مع هذه التقانات.
Questions related to the research
  1. ما هي الأنواع الخمسة من Bacillus التي تم تمييزها في الدراسة؟

    الأنواع الخمسة هي B. pumilus وB. subtilis وB. lentus وB. megaterium وB. cereus.

  2. ما هي الفوائد الرئيسية لاستخدام تقانة FTIR-ATR في تمييز العزلات البكتيرية؟

    الفوائد الرئيسية هي الدقة، السرعة، سهولة التطبيق، وانخفاض التكلفة.

  3. ما هي الاختبارات التقليدية التي تم استخدامها لتصنيف العزلات البكتيرية؟

    تم استخدام اختبارات فيزيولوجية مثل درجة الحرارة المثلى للنمو ودرجة pH، واختبارات بيوكيميائية مثل فوغس-بروسكاور وحلمأة الجيلاتين والإسكولين.

  4. ما هي المادة المستخدمة في موشور وحدة الانعكاس الكلي المخفف في تقانة FTIR-ATR؟

    المادة المستخدمة هي ZnSe.


References used
Al-Qadiri, H. M., M. A. Al-Holy. M. Lin. N. I. Alami. A. G. Cavinato and B. A. Rasco. 2006. Rapid detection and identification of Pseudomonas aeruginosa and Escherichia coli as pure and mixed cultures in bottled drinking water using fourier transform infrared spectroscopy and multivariate analysis. J. Agric. Food Chem., 54(16): 5749-5754
Beattie, S. H. 1997. The incidence and importance of Bacillus species in raw milk and the dairy environment. Ph. D. thesis, Glasgow University
Beattie, S. H., C. Holt. D. Hirst and A. G. Williams. 1998. Discrimination among Bacillus cereus, B. mycoides and B. thuringiensis and some other species of the genus Bacillus by fourier transform infrared spectroscopy. FEMS. Microbiol. Lett., 164: 201-206
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