{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,7]],"date-time":"2025-10-07T15:56:30Z","timestamp":1759852590251,"version":"build-2065373602"},"reference-count":39,"publisher":"Editorial CSIC","issue":"2","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["For. syst."],"abstract":"<jats:p>Aim of the study: The ability of NIR spectroscopy for predicting the ISO brightness was studied on unbleached Kraft pulps of Acacia melanoxylon R. Br.Area of study: Sites covering littoral north, mid interior north and centre interior of Portugal.Materials and methods: The samples were Kraft pulped in standard identical conditions targeted to a kappa number of 15. A Near Infrared (NIR) partial least squares regression (PLSR) model was developed for the ISO brightness prediction using 75 pulp samples with a variation range of 18.9 to 47.9 %.Main results: Very good correlations between NIR spectra and ISO brightness were obtained. Ten methods were used for PLS analysis (cross validation with 48 samples), and a test set validation was made with 27 samples. The 1stDer pre-processed spectra coupling two wavenumber ranges from 9404 to 7498 cm-1 and 4605 to 4243 cm-1 allowed the best model with a root mean square error of ISO brightness prediction of 0.5 % (RMSEP), a r2 of 99.5 % with a RPD of 14.7.Research highlights: According to AACC Method 39-00, the present model is sufficiently accurate to be used for process control (RPD \u2265 8).Key words:\u00a0 Acacia melanoxylon; unbleached Kraft pulps; ISO Brightness; NIR; RPD.<\/jats:p>","DOI":"10.5424\/fs\/2015242-07580","type":"journal-article","created":{"date-parts":[[2015,7,27]],"date-time":"2015-07-27T09:42:04Z","timestamp":1437990124000},"page":"eRC03","source":"Crossref","is-referenced-by-count":9,"title":["Estimation of Acacia melanoxylon unbleached Kraft pulp brightness by NIR spectroscopy"],"prefix":"10.5424","volume":"24","author":[{"given":"Ant\u00f3nio J.A.","family":"Santos","sequence":"first","affiliation":[]},{"given":"Of\u00e9lia","family":"Anjos","sequence":"additional","affiliation":[]},{"given":"Helena","family":"Pereira","sequence":"additional","affiliation":[]}],"member":"2373","published-online":{"date-parts":[[2015,7,27]]},"reference":[{"key":"ref0","doi-asserted-by":"publisher","DOI":"10.1515\/HF.2006.006"},{"key":"ref0","doi-asserted-by":"publisher","DOI":"10.1007\/s00226-007-0130-0"},{"key":"ref0","doi-asserted-by":"publisher","DOI":"10.1007\/s00226-010-0383-x"},{"issue":"2","key":"ref1","first-page":"185","article-title":"Effect of Acacia melanoxylon fibre morphology on papermaking potential.","volume":"64","author":"Anjos","year":"2011","unstructured":"Anjos O, Santos A, Sim\u00f5es R, 2011. 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