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- Some preliminary data on the enzymatic hydrolysis of Pinus pinaster kraft pulpPublication . Duarte, Ana Paula; Spiridon, IulianaEnzymes' applications in pulp and paper manufacturing processes and products is gaining global attention. In fact, several applications, including pitch deposits, drainage enhancement, deinking of wastepapers, pulp bleaching enhancement and modification of fibers' characteristics are already used at industrial level. Enzymes are being produced on a commercial scale and are available at a relatively low price. Research to establish the effect of enzymatic treatment continues in an effort to increase knowledge about the action of enzymes. The present paper, an additional contribution to this field, studies the potential utilization of hydrolytic enzymes to enhance the fiber characteristics derived from Pinus pinaster kraft pulp.
- Influence of xilanase treatment on Pinus pinaster kraft pulpPublication . Spiridon, Iuliana; Duarte, Ana Paula; Curto, JoanaIn Portugal, pulp and paper industry uses especially two wood species, Eucalyptus globules and Pinus pinaster. The second species gives pulps with low bleachability (compared with other common softwood species, like Pinus silvester), utilised for packaging papers. It is known that treatments with different hydrolytic enzymes could improve the bleaching capacity of softwood pulp. That is why, xylanases were used to improve Pinus pinaster kraft pulp characteristics. The enzymatic hydrolysis improved brightness and some papermaking properties.
- Enzymatic hydrolysis of Pinus pinaster kraft pulpPublication . Duarte, Ana Paula; Spiridon, Iuliana; Belgacem, Mohamed Naceurkraft pulp from Pinus pinaster was treated with two enzymes preparations - Cartazyme MCX-A (which presents both cellulase and xylanase activity) and Cartazyme PS-10 (a xylanase preparation) to enhance papermaking properties of the fibres. Both preparations reduced Kappa number and improved brightness, while the effect on the papermaking properties was different.