Treatment of the extractive-free bark samples with 1 percent NaOH to remove interfering phenolic compounds impacted the lignin contents determined by the Klason method, but not those determined by the acetyl bromide method.
Lignin contents were also determined by the acetyl bromide method (Morrison 1972) using an extinction coefficient of 23.
Alternatively, analyses of extractive-free samples by the acetyl bromide method gave even lower lignin contents.
Acetyl bromide lignin analyses, infrared spectroscopic analyses, and density changes of 30 [micro]m-thick sections of peracetic-acid-treated samples, as a function of depth from the wood surface, suggested that a partial delignification had occurred that diminished with depth.
27), (28) To determine lignin content in small wood samples, an acetyl bromide procedure and a spectrophotometer were used.
In our work, an acetyl bromide lignin method(31) was modified slightly for application in the analysis of microtome, sections.
A sequence of preliminary acetyl bromide lignin analyses were performed on 24 quality-controlled (QC) mature pine samples to quantify the 95% confidence interval for the lignin content determined by the acetyl bromide method.
The acetyl bromide lignin analyses are consistent with a diffusion-controlled delignihcation process occurring in the treatment bath.
11) closely resembles that of the acetyl bromide lignin data.
Marton, J, "Determination of Lignin in Small Pulp and Paper Samples Using the Acetyl Bromide Method.
Fukushima, RS, Hatfield, RD, "Extraction and Isolation of Lignin for Utilization as a Standard to Determine Lignin Concentration Using the Acetyl Bromide Spectropholomel-ric Method.