The silver nanoparticle colloid was used to obtain surface enhanced Raman spectra of Listeria monocytogenes, Salmonela enterica, and Esherichia coli bacteria. The SERS spectra were captured using for excitation the near-infrared (1064 nm) laser radiation with reduced intensity, which ensured the prevention of the fluorescence background as well as photo- and thermal decomposition of the samples. It was found that the optimal size of silver nanoparticles for the enhancement of the Raman signal in the near-infrared spectral region is ca. 50 nm. The spectral data obtained in this study indicate that relative intensities of SERS spectral bands of bacteria can be used for spectral differentiation of bacteria. In case of Listeria , Salmonela, and Esherichia cells, the intensity ratio of spectral bands of adenine and cysteine can be used as a spectral marker for differentiation of the bacteria.
Keywords: SERS, silver colloid, bacteria identification and differentiation
PACS: 87.64.kp, 87.85.Rs, 87.19.xu

PAVIRŠIUMI SUSTIPRINTOS FT RAMANO SPEKTROSKOPIJOS TAIKYMAS BAKTERIJŲ PADERMIŲ NUSTATYMUI
K. Kairytė^a, Ž. Lukšienė^a, M. Pučetaitė^b , and V. Šablinskas^b
aVilniaus universiteto Taikomųjų mokslų institutas, Vilnius, Lietuva
^bVilniaus universiteto Fizikos fakultetas, Vilnius, Lietuva

Listeria monocytogenes, Salmonela enterica ir Esherichia coli bakterijų Ramano spektrai buvo užregistruoti naudojant sidabro nanodalelių koloidinį tirpalą. Bakterijų paviršiumi sustiprintiems Ramano sklaidos (SERS) spektrams žadinti pirmą kartą buvo panaudotas 1064 nm bangos ilgio lazeris. Nustatyta, kad naudojant 50 nm skersmens sidabro nanodalelių koloidą stebimas didžiausias bakterijų Ramano sklaidos signalo stiprinimas. Galima daryti išvadą, kad bakterijų diferencijavimui SERS spektriniu metodu yra naudotini ne spektrinių juostų dažniai, o jų santykiniai intensyvumai. Listeria monocytogenes, Salmonela enterica ir Esherichia coli ląstelių diferencijavimui tinkamiausias yra SERS spektrinis žymuo – adenino ir cisteino spektrinių juostų 600–750 cm^–1 srityje intensyvumų santykis.

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