Non-migratory bioactive polymers(NMBP)in food packaging 83 500 1000 Fig 5.4 Atomic force microscopy surface profiles of(a)untreated and(b)UV irradiated ylon film(from Shearer et al. (2000), reprinted by permission of Wiley-Liss, In subsidiary of John Wiley and Sons, Inc. hing of the film by the laser treatment would result in increased bacterial adsorption compared to the native film. Bacterial adsorption is the most likely cause of the decreased bacterial populations observed for the untreated nylon films. and in most cases the differences observed between the treated and untreated films were small, typically of the order of one log. More investigation is needed to determine whether cells are adsor bed or inactivated 5.4.3 Others In addition to the polymers mentioned above, many others have been investigated for potential bioactivity. An interesting recent development is the possibility ofetching of the film by the laser treatment would result in increased bacterial adsorption compared to the native film. Bacterial adsorption is the most likely cause of the decreased bacterial populations observed for the untreated nylon films, and in most cases the differences observed between the treated and untreated films were small, typically of the order of one log. More investigation is needed to determine whether cells are adsorbed or inactivated. 5.4.3 Others In addition to the polymers mentioned above, many others have been investigated for potential bioactivity. An interesting recent development is the possibility of Fig. 5.4 Atomic force microscopy surface profiles of (a) untreated and (b) UV irradiated nylon film (from Shearer et al. (2000), reprinted by permission of Wiley-Liss, Inc., a subsidiary of John Wiley and Sons, Inc.) Non-migratory bioactive polymers (NMBP) in food packaging 83