Convective drying of bacteria

Lievense, L.C.; Riet, K. van ’t

doi:10.1007/bfb0007386

Cited by 32 publications

(35 citation statements)

References 24 publications

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“…The resultant microorganisms in the dry form retrieve metabolic activity upon rehydration with retained biological properties and genetic stability. From an economical point of view, however, the long processing time and the comparatively high processing cost make freeze drying less favorable for the mass-production of dry cells (Desobry, Netto, & Labuza, 1997;Lievense & van't Riet, 1993;Ratti, 2001;. Other drying approaches including convective drying and conductive drying have hence been investigated, with the aim of developing a more costeffective process for the dehydration of microorganisms.…”

Section: Introductionmentioning

confidence: 99%

“…This article is intended to give a step-by-step discussion on maximizing the survival of microbial cells during thermal drying with respect to microbiological properties and kinetics modeling. Factors that affect the cell activity in a convective drying process may be logically grouped into two categories: intrinsic and extrinsic factors (Lievense & van't Riet, 1993. Intrinsic factors mainly affect the stress tolerance of cells and are implicit characteristics of a given microorganism.…”

Section: Introductionmentioning

confidence: 99%

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Towards a maximal cell survival in convective thermal drying processes

Chen

2011

Food Research International

274

194

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Towards a maximal cell survival in convective thermal drying processes

Chen

2011

Food Research International

274

194

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“…There is much eviThe residual activity of dried Lactobacillus plantarum can dence that bacteria harvested in the stationary growth phase be improved by choosing the appropriate drying conditions possess a higher residual activity after drying compared to (Linders et al 1996a,b). Growth conditions may also influbacteria harvested in the exponential growth phase (Chamence the production of dry active starter cultures (Champagne pagne et al 1991;Kessler 1993;Lievense and Van 't Riet et al 1991;Kessler 1993;Kets and De Bont 1994;Lievense 1994;Potts 1994;Teixeira et al 1995). According to Chamand Van 't Riet 1994;Potts 1994), although there is little pagne et al (1991) cells will survive freeze drying best when literature on this topic.…”

Section: Introductionmentioning

confidence: 99%

Effect of growth parameters on the residual activity of Lactobacillus plantarum after drying

Linders

Meerdink

Riet

1997

Journal of Applied Microbiology

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. In order to select optimal conditions for the production of dry and active starter cultures it is important to determine the influence of growth conditions on the residual activity of dried bacteria. The influence of medium composition, pH during growth, continuous vs batch reactor and growth phase was studied on the residual activity of Lactobacillus plantarum after drying. The effect of high sodium chloride concentrations during growth on the residual activity of Lact. plantarum after drying was measured. The samples were dried by convection and in a fluidized bed. Bacteria with the highest residual activity after drying were produced in batch or chemostat with pH-controlled growth using enriched or diluted MRS medium. The presence of 1 or 1·25 mol l −1 NaCl during growth resulted in a decreased residual activity after drying. Variations in growth conditions (application of stress) generally did not result in higher residual activities after drying.

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“…During dehydration there is an inherent loss of viability which has been ascribed to alterations in the DNA or RNA and intracellular proteins, but it is now generally agreed that damage occurs first in cell membranes [17]. Accumulation of some sugars which may induce a glassy state and provide specific protection to proteins and membranes correlates well with a high survival rate under desiccated conditions in bacteria, seeds, nematodes, and other organisms [1].…”

Section: Introductionmentioning

confidence: 99%

Viability of dry Trichoderma harzianum spores under storage

Pedreschi

Aguilera

1997

Bioprocess Engineering

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Spores of the potential biocontrol agent Trichoderma harzianum P1 were prepared without (M1) and with heat shock (40°C for 90 min) after fermentation (M2), filtered into a paste and dried over silica gel. M1 and M2 exhibited high viability (55%) and similar initial trehalose contents (4.0 and 5.4%, respectively) after slow drying. No significant differences in viability were found between treatments during storage for 110 days under different temperatures, T (8, 33 and 42°C) and water activities, a w (0.03, 0.33 and 0.75). Viability of spores, after storage at a w 0:03 were 100 and 70% for 8 and 33°C, respectively. During storage, decrease in trehalose content and viability was faster at a w 0:75 and 42°C. Loss of viability was modeled by a first order kinetic model depending on 1=T and a w . M2 (with heat shock) showed slightly higher trehalose contents than M1 which resulted in 100% viability after 52 days at 8°C. List of symbols a wwater activity , and parameters in GAB equation 1 , and parameters in kinetic equation AV t absolute viability of dried spores after time t AV 0 absolute viability of spores after drying CFU colony forming units k kinetic constant, function of T and a w days )1 k b y c constants in the GAB equation m moisture content g water/g dry spores m 0 monolayer value g water/g dry spores t storage time days TS total number of spores (conidia) V relative viability at certain time t V 0 relative viability at time zero

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Convective drying of bacteria

Cited by 32 publications

References 24 publications

Towards a maximal cell survival in convective thermal drying processes

Towards a maximal cell survival in convective thermal drying processes

Effect of growth parameters on the residual activity of Lactobacillus plantarum after drying

Viability of dry Trichoderma harzianum spores under storage

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