Sciences

Distribution of optical brightening agent (OBA), in the fibre wall of high-yield and kraft pulps

Distribution of optical brightening agent (OBA), in the fibre wall of high-yield and kraft pulps

RÉSUMÉ

An aspen High-yield pulp (HYP) was fractionated and processed with Optical Brightening Agents (OBA), and their UV fluorescent images were taken using the fluorescence microscopy technique. The results were compared with those from a hardwood Kraft pulp. At a same OBA charge, the fluorescent intensity of OBA-treated Kraft pulp was stronger than that of the OBA-treated HYP. Interestingly, for the aspen HYP, the OBA diffusion occurred from both the fibre surface inward, and the lumen outward, while for the Kraft pulp, the OBA diffusion occurred mainly from the fibre surface inward. The difference between mechanical and Kraft pulping processes, (mechanical pulping produces open-ended fibres while chemical pulping produces intact fibres), can account for the difference in the OBA diffusion between the HYP and Kraft pulp.

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Towards a commercial production of phage-based bioactive paper

Towards a commercial production of phage-based bioactive paper

RÉSUMÉ

Detection and disabling of harmful bacteria such as Escherichia coli (E.coli), Listeria, and Salmonella is of great importance to control disease apparition in air, water or food. Due to inherent flexibility, low cost and ease of fabrication, papers and non-woven are ideal substrates to functionalize for bioactivity.

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