Extraction of Polyphenols from P<i>inus radiata</i>Bark

Yazaki, Y.

doi:10.1515/hfsg.1985.39.5.267

Cited by 20 publications

(18 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[15,16] For water extraction at 90 C, the yield of extractable material based on bark residue indicated ca. 20% of extractable material was removed from the bark ( Table 2).…”

Section: Resultsmentioning

confidence: 99%

NMR Estimation of Extractables from Bark: Analysis Method for Quantifying Tannin Extraction from Bark

Hill

McIntosh

Grigsby

2003

Journal of Wood Chemistry and Technology

View full text Add to dashboard Cite

Extraction and recovery of radiata pine bark tannin for use in adhesives should endeavour to be optimal to ensure process viability. A NMR method has been developed to directly gauge the extent of tannin extraction from bark by analyzing processed residues. 13 C Solid-state NMR spectra were obtained for a series of bark and residue samples. The respective peak areas and heights of extractable polyphenolic tannins were compared with residual lignocellulosic materials. From the ratio of NMR peak intensities, diminishing polyphenolic content was apparent with increasing degree of extraction. The percentage polyphenolic tannins removed by extraction could be estimated by a simple equation comparing integrated

show abstract

“…[15,16] For water extraction at 90 C, the yield of extractable material based on bark residue indicated ca. 20% of extractable material was removed from the bark ( Table 2).…”

Section: Resultsmentioning

confidence: 99%

NMR Estimation of Extractables from Bark: Analysis Method for Quantifying Tannin Extraction from Bark

Hill

McIntosh

Grigsby

2003

Journal of Wood Chemistry and Technology

View full text Add to dashboard Cite

show abstract

“…Furthermore, extraction of radiata pine bark with aqueous sodium hydroxide gives a higher yield of extractives than extraction with water (Yazaki 1985). However, the amount of NaOH used for extraction should be very carefully monitored, because highly alkaline conditions cause the rearrangement of the Α-ring structure of polyflavanoids, resulting in the loss of reactivity of polyflavanoids with formaldehyde (Sears et al 1974;Yazaki and Aung 1989).…”

Section: Introductionmentioning

confidence: 99%

Extraction of Polyflavanoids from Radiata Pine Bark Using Hot Compressed Water at Temperatures Higher than 100 °C

Inoue¹,

Asaga²,

Ogi³

et al. 1998

Holzforschung

Self Cite

View full text Add to dashboard Cite

Radiata pine bark was extracted using hot compressed water with or without 1 % NaOH at temperatures of 100 °C and higher under different pressures for various holding times. The yields of extractives and polyflavanoids obtained from the extraction of the bark using hot compressed water without NaOH were much lower than those from conventional extraction at ambient pressure. This result has confirmed our previous experience. However, when 1 % NaOH (based on the weight of the oven-dried bark) was added to the compressed water system, the yields of the extractives and polyflavanoids increased remarkably, and the highest yield (31.3%) of the extractives was obtained at a peak temperature of 140°C and a pressure of lOatm followed by immediate cooling. Furthermore, the bark particle size and the ratio of bark to solvent affected to a much lesser extent the yield of the extractives in this new method, compared with that in the conventional method. The solubility behaviour of the tannin extracts in the hot compressed water is discussed in relation to the extractives yield from the extraction of the bark at temperatures higher than 100°C and at pressures higher than ambient.

show abstract

“…The investigations done on bark extracts of pine species allowed us to detect and identify some carboxylic acids. These compounds represent about 22 to 25 % of these extracts (Yazaki 1985;Weißmann 1983). The presence of ferulic acid in radiata pine bark extract was reported by Yazaki and Aung (1988).…”

Section: Introductionmentioning

confidence: 72%

Carboxylic Acids of Moroccan Pinus Pinaster Bark Extract

Benlarbi¹,

Fechtal²,

Meziane³

et al. 1999

Holzforschung

View full text Add to dashboard Cite

R. Benlarbi et al.: Carboxylic Acids of Pinus pinaster Bark HPLC HPLC analyses were performed with a Jasco chromatograph equipped with a diode 870 UV/VIS detector and 880Up pumps. It is fitted with a 250 * 4.6 mm id, Whatman ODS column that is protected with a pre-column of the same material. The mixture Holzforschung 53 (1999) 580-584 SummaryIn this work, carboxylic acids of the Moroccan Pinus pinaster bark were studied and analysed by High Performance Liquid Chromatography (HPLC), Thin Layer Chromatography (TLC) and Gas Chromatography coupled with Mass Spectrometry (GC-MS). Several acids, such as gallic, p-hydroxyphenylacetic, 3,4-dihydroxyphenylacetic, salicylic, shikimic, protocatechuic, terephtalic, ferulic, p-coumaric, vanillic, caffeic and isovanillic acids, were detected by direct injection of standard products and by studying the mass spectrum of their trimethylsilyl derivatives. KeywordsBark extract Pinus pinaster Carboxylic acids HPLC TLC GC-MS Brought to you by | The University of Auckland Library Authenticated Download Date | 5/17/15 3:04 AM

show abstract

Extraction of Polyphenols from Pinus radiataBark

Cited by 20 publications

References 2 publications

NMR Estimation of Extractables from Bark: Analysis Method for Quantifying Tannin Extraction from Bark

NMR Estimation of Extractables from Bark: Analysis Method for Quantifying Tannin Extraction from Bark

Extraction of Polyflavanoids from Radiata Pine Bark Using Hot Compressed Water at Temperatures Higher than 100 °C

Carboxylic Acids of Moroccan Pinus Pinaster Bark Extract

Contact Info

Product

Resources

About