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Bacillus subtilis BS-2 and peppermint oil as biocontrol agents against Botrytis cinerea

Grata Katarzyna, Rombel-Bryzek Agnieszka, Ziembik Zbigniew

Ecological Chemistry and Engineering. S

2019

Vol. 26, nr 3

597--607

The purpose of this study was to assess the activity of Bacillus subtilis BS-2 and peppermint oil against Botrytis cinerea. In this study parameters such as the age and the density of the bacterial culture and the incubation temperature were taken into consideration. Furthermore, the cellulolytic activity of the bacterium was determined. The effect of peppermint oil was evaluated at a concentration range of 0.5-4.0 %. The research was conducted with a dual culture plate method. The influence of B. subtilis BS-2 and peppermint oil on the growth of B. cinerea was evaluated based on the growth rate index. It was noted that the bacterial culture occurred at an initial density of OD 560 = 1.0, cultivated at 30 °C for 48 hours demonstrated the strongest antagonistic effect (57.07 % inhibition). Furthermore, it was observed that the highest cellulolytic activity occurred on the bacteria incubated for 48 hours at 37 °C. The effect of mint oil, at the lowest concentration of 0.5-1.0 %, was much weaker on bacterial activity (1.1-12.1 % inhibition). The highest concentration (4.0 %) of mint oil caused the maximum inhibition (31.9 %) of the mycelial growth. B. subtilis BS-2 may be environmental-friendly alternatives for protecting plants against B. cinerea.

Off-line coupling liquid chromatography and capillary gas chromatography-mass spectrometry for ultratrace determination of delamethrin in mint oil

Lamiri A., Medvedovici A.V., David F., David V., Sandra P.

Chemia Analityczna

1999

Vol. 44, No. 6

977-984

Analysis of the pyrethroid Deltamethrin in mint oil was achieved at 10 ng g-1 level by off -line couplil1g liquid chromatography (HPLC) and capillary gas chlomatography (CGC). Both LC and GC conditions are discussed. Mass spectrometry (MS) was used as detection system for the gas chromatographic analysis. The single ion monitoring (SIM) mode was chosen,in order to enha11ce on selectivity and sensitivity. Simultaneous moni-toring of three mass channels and calculatio11 of the respective intensity ratios allows structural confirmatio11. Attempts for replacing the LC fractionation step by SPE fail.

Deltametrinę oznaczano w olejku mięty na poziomie 10 ng g(-1) dzięki sprzężeniu off-line chlomatografii cieczowej (HPLC) i kapilarnej chromatografii gazowej (CGC). Przedyskutowano warunki doświadczalne dla obu technik chromatograficznych. W chromatografii gazowej jako detektol- stosowano spektometrię mas (MS). W celu zwiększenia selektywności i czułości stosowano monitorowanie jednego jonu (SIM). Jednocześnie monitorowanie masy w trzech kanałach i obliczanie odpowiedziach stosunków intensywności pozwoliło na potwierdzenie struktury. Nie udało się zastąpić na etapie frakcjonowania chromatografii cieczowej przez ekstrakcję do fazy stałej (SPE).