The Rapid Tentative Recognition of Psychro‐trophic Types Among Enterobacteriaceae Isolated From Foods

Mossel, D. À. A.; Zwart, H.

doi:10.1111/j.1365-2672.1960.tb00194.x

Cited by 35 publications

(12 citation statements)

References 23 publications

(9 reference statements)

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“…over 37°C), the so-called thermotrophic types, because they found such counts to be invariably low in waters of good sanitary quality Schmidt-Lorenz, 1981: Schmidt-Lorenz andJaeggi, 1983). We have established earlier that a similar approach could be followed to assess and interpret colonization of piped water and some types of food by Gram-negative bacteria (Mossel and Zwart, 1960: Leclerc et al, 1983: Mossel et al, 1983a. The Swiss results and our own prompted a study of the feasibility of using an enumeration of thermotrophs for the monitoring of bottled, still mineral waters, by carrying out a survey on two leading French brands.…”

Section: Introductionmentioning

confidence: 99%

Monitoring non-carbonated (‘still’) mineral waters for aerobic colonization

Leclerc

Mossel

Savage

1985

International Journal of Food Microbiology

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Fifty samples each of two leadmg brands of French, non-carbonated ('still') mineral waters, packed an plastic bottles, were stored in the dark for one month at approx~mateb. 200(. . to allot marked proliferation of their autotrophic microbial flora. Upon completion of th~s challenge test 1250 ml per bottle were filtered through five membranes. ~.h~ch were subsequently cultured on 1/10 strength nutrient agar for 48 h at a temperature favouring the growth of thermotrophtc orgam~ms only,, i.e 42 _+ 0 5°C. The numbers of colonies per one htre were below 10 ~ in all samples and did not exceed 200 in 56-80~. depending on the brand. Identification of the ~solates demonstrated strong inhibition of the psychrotrophic Gram-negative types, predominating m the association flora of stored stdl v, ater~ and preponderance of Gram-positive. catalase-posmve, facultatively anaerobic cfx:ci. Consequentl). a Reference Value for the thermotrophic autotrophic colony count per I ml m stdl, commercial mineral taters of the order m = I and M -5 seems justified. It is emphasized that. besides exammmg for these trl~.ial orgamsms, the usual tests for marker bacteria (Escherwht, coh and Lancefield group D .,treptoctv,,'cO and Pseud,monas aerugmosa should always be carried out

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Section: Introductionmentioning

confidence: 99%

Monitoring non-carbonated (‘still’) mineral waters for aerobic colonization

Leclerc

Mossel

Savage

1985

International Journal of Food Microbiology

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“…1101 Such analytical techniques have mostly to be developed, or at least adapted, then carefully standardized, and ultimately laid down in crystalclear procedures.…”

Section: The Required "Twinning" Between Standards and Methodsmentioning

confidence: 99%

Occurrence, prevention, and monitoring of microbial quality loss of foods and dairy products

Mossel

Pflug

1975

C R C Critical Reviews in Environmental Control

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“…For this purpose all colonies obtained in VRBG plates were streaked onto plates with MacConkey agar incubated at 37°C and single colonies thus obtained examined for the traits of the main genera of Enterobacteriaceae by the procedures described earlier. In addition to assessing their psychrotrophic character, cultures from these colonies were made in brain heart infusion broth (BHI) (Oxoid CM 225) incubated at 37°C and subcultured on VRBG plates incubated at 30 as against 43°C (Mossel and Zwart, 1960).…”

Section: Table IImentioning

confidence: 99%

Control of the bacteriological condition of calf brain. I. Impact of improving hygiene

Smulders

Korteknie

Woolthuis

1985

International Journal of Food Microbiology

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Sixty calves of the Dutch Friesian (FH) breed were stunned mechanically. Without previously having been stunned, another 30 calves were stuck according to the Jewish rite. Upon opening of the skulls (1-2 h post mortem) brains of mechanically stunned calves were collected either conventionally ( n = 30) or 'hygienically" (n = 30), i.e. using a fresh pair of surgical gloves during each removal to avoid cross contamination. For ritually slaughtered animals only the hygienic procedure was followed. Samples of 10 g were excised from undamaged hemispheres and in the mechanically stunned treatment group also from the site of impact of the captive bolt. After storage in polystyrene trays at 3 + I°C for 7 days sampling was repeated. Bacteriological examination included the assessment of aerobic colony counts at 30°C for 3 days (ACC-30) and 4°C for 14 days (ACC-4) and Enterobacteriaceae colony counts at 37°C for 20 h (ECC). In conventionally collected samples the ACC-30 and ACC-4 were 3.8 and 3.0 log10 cfu g-1 at day 1 and 6.2 and 6.4 loglo cfu g-1 at day 8. With hygienic collection these counts were reduced by approximately 1 log unit. Whilst by conventional practice the ECCs, at day 1 and 8 were 2.6 and 4.8 log10 cfu g-I these counts were 1.8 and 2.6 log10 cfu g-I for hygienic practice. In samples excised from the site of impact of the captive bolt the hygienic procedure had similar, though less marked effects. On day 1 brains from ritually slaughtered animals had a bacteriological contamination similar to that found in the hemispheres of mechanically stunned calves. However, whilst at day 8 their mean ECCs were 3.4 and 3.5 log10 cfu g-1 the percentages of plates 'positive' for Enterobacteriaceae were only 10% in the ritually vs. 53% in the mechanically stunned group. The Enterobacteriaceae in this case were composed of psychrotrophic non-pathogenic genera of environmental origin. Salmonella was not isolated from any sample.

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The Rapid Tentative Recognition of Psychro‐trophic Types Among Enterobacteriaceae Isolated From Foods

Cited by 35 publications

References 23 publications

Monitoring non-carbonated (‘still’) mineral waters for aerobic colonization

Monitoring non-carbonated (‘still’) mineral waters for aerobic colonization

Occurrence, prevention, and monitoring of microbial quality loss of foods and dairy products

Control of the bacteriological condition of calf brain. I. Impact of improving hygiene

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