Measurement of Tannic Substances in Forest Species

Medeiros, Jordânia Xavier de; Calegari, Leandro; Silva, Girlânio; Oliveira, Elisabeth de; Pimenta, Alexandre Santos

doi:10.1590/2179-8087.058916

Cited by 7 publications

(5 citation statements)

References 11 publications

(12 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The use of MT + NaHSO 3 also resulted in greater CT if compared to the unmodified MT, although the NT remained similar in this case. These results are different from those reported in a previous study on MT bark and some extractions done under hot water [43]. These divergences can be explained by some differences in extracting procedures, as well as differences in the used raw materials (like particle size of and extraction mechanism).…”

Section: Analysis Of Powdered Tannin-based Extracts (Pte)contrasting

confidence: 97%

Tannin-based extracts of Mimosa tenuiflora bark: features and prospecting as wood adhesives

et al. 2021

Self Cite

View full text Add to dashboard Cite

Mimosa tenuiflora (Willd.) Poir. (MT) is an underutilized plant specie since its wood is mostly used for energy production. Nonetheless, the bark from this forest plant has a high amount of tannins and other valuable compounds. Tannins have high worldwide importance and, because of that, there is an increasing number of researches on biorefinery systems aiming at maximizing their exploitation. The present study evaluated tannins extracted from the MT bark and their use for producing wood adhesives. Three types of powdered tannins were extracted using different solvents: a pure aqueous solution, a 5% sodium hydroxide (NaOH) aqueous solution, and a 5% sodium bisulfite (NaHSO3) aqueous solution. Distilled water, wheat flour, and formaldehyde were also used as a solvent, a glue extender, and a catalyst, respectively. These adhesives were applied for bonding pine wood joints and their shear strengths were determined. All the MT-based adhesives showed high viscosities and, yielded glue lines with similar shear strengths and similar shear deformations if compared to each other. That tannin-based glue incorporated with the tannin extracted using NaOH or NaHSO3 stood out and yielded similar bonding performances if compared to a commercial adhesive applied as a positive control.

show abstract

Section: Analysis Of Powdered Tannin-based Extracts (Pte)contrasting

confidence: 97%

Tannin-based extracts of Mimosa tenuiflora bark: features and prospecting as wood adhesives

et al. 2021

Self Cite

View full text Add to dashboard Cite

show abstract

“…The use of MT + NaHSO3 also resulted in greater CT if compared to the unmodified MT, although the NT remained similar in this case. These results are different from those reported in a previous study on MT bark and some extractions done under hot water [46]. These divergences can be explained by some differences in extracting procedures, as well as differences in the used raw materials (like particle size of and extraction mechanism).…”

Section: Analysis Of Powdered Tannin-based Extracts (Pte)contrasting

confidence: 97%

Tannin-Based Extracts of Mimosa Tenuiflora Bark: Features and Prospecting as Wood Adhesives

Lopes

Calegari

Silva

et al. 2020

Preprint

Self Cite

View full text Add to dashboard Cite

Mimosa tenuiflora (Willd.) (MT) Poir. is an underutilized plant specie since its wood is mostly used for energy production. Nonetheless, the bark from this forest plant has a high amount of tannins and other valuable compounds. Tannins have high worldwide importance and, because of that, there is an increasing number of researches on biorefinery systems aiming at maximizing their exploitation. The present study evaluated tannins extracted from the MT bark and their use for producing wood adhesives. Three types of powdered tannins were extracted using different solvents: a pure aqueous solution, a 5% sodium hydroxide (NaOH) aqueous solution, and a 5% sodium bisulfite (NaHSO3) aqueous solution. Also, distilled water, wheat flour, and formaldehyde were used as a solvent, a glue extender, and a catalyst, respectively. These adhesives were applied for bonding pine wood joints and their shear strengths were determined. All the MT-based adhesives showed high viscosities and, if compared to each other, yielded glue lines with similar shear strengths and similar shear deformations. That tannin-based glue incorporated with the tannin extracted using NaOH/NaHSO3 stood out and yielded a similar bonding performance compared to a commercial adhesive applied as a positive control.

show abstract

“…The two latter values of TSC were statistically equal. The TSC found in the present study for M. tenuifl ora is lower than that determined by Medeiros et al (2018), who observed a value of 44.6% for the same species. The authors explained such diff erences in bark solids content by dissimilarities regarding edaphoclimatic conditions and genetic factors.…”

Section: 1tannin Extraction and Quantifi Cationcontrasting

confidence: 90%

Extraction, Quantification, and Ftir Characterization of Bark Tannins of Four Forest Species Grown in Northeast Brazil

et al. 2021

View full text Add to dashboard Cite

Condensed tannins are chemical compounds derived from the secondary metabolism of plants. They are of particular interest due to their broad range of technological uses and applications. The objective of this study was to extract, quantify, and characterize by Fourier-transform infrared spectroscopy (FTIR) the bark tannins of four forest species grown in Northeast Brazil: Acacia mangium, Azadirachta indica, Mimosa tenuiflora, and Mimosa caesalpiniifolia. Bark samples were collected from 5 trees of each species grown in a five-year-old forest stand. Samples were collected, grounded, and submitted to extraction with hot water, then measured to determine total solids content (TSC), Stiasny number (SN), and condensed tannins content (CTC). FTIR spectra were acquired from tannin samples fixed in potassium bromide pellets. Among the four species, M. tenuiflora presented the highest CTC, equal to 23.4%, and the purest crude hot-water extract with SN of 91.27%. Based on FTIR characterization, tannins from M. caesalpiniifolia, A. indica, and A. mangium barks were classified as proanthocyanidins and those from M. tenuiflora bark as prodelphinidins.

show abstract

Measurement of Tannic Substances in Forest Species

Cited by 7 publications

References 11 publications

Tannin-based extracts of Mimosa tenuiflora bark: features and prospecting as wood adhesives

Tannin-based extracts of Mimosa tenuiflora bark: features and prospecting as wood adhesives

Tannin-Based Extracts of Mimosa Tenuiflora Bark: Features and Prospecting as Wood Adhesives

Extraction, Quantification, and Ftir Characterization of Bark Tannins of Four Forest Species Grown in Northeast Brazil

Contact Info

Product

Resources

About