Ranganathan Sumanth, Campion Sylke H, Dale Reid A, Tanjay Queenie L, Murray Rachel H, de Lena Anna, Robertson Michael, Thumm Armin, West Mark
Scion, 49 Sala Street, Rotorua, 3010, New Zealand.
Bioresour Bioprocess. 2025 May 31;12(1):49. doi: 10.1186/s40643-025-00896-3.
Pinus radiata is the dominant tree species in exotic plantation forestry of New Zealand producing timber for construction and pulp and paper. Additionally, the processing yields large amounts of bark as a byproduct that is either left at the harvest site or used for landscaping. P. radiata bark is rich in biochemical extractives containing polyphenols and waxes on sequential extraction with hydrophilic and lipophilic solvents, respectively. Previous studies have exclusively focussed on the effect of parameters such as solvent type, bark to solvent ratio, and extraction time on the yield of extractives. However, two parameters were always maintained constant: solvent order (lipophilic to hydrophobic) and particle size. This work investigated the the combined impact of these two parameters on total yield and product quality by using two solvents- water and hexane. Total extractives were highest when water was used first (11.74% and 9.45%) compared to hexane (10.53% and 6.53%). The individual yields of hexane extractives were in the range of 2.25-2.9% while those of water were 4.30-9.24%. Chemical analyses of the extracts and residues showed no qualitative differences, indicating the order in which bark is extracted does not alter the extract composition. Moreover, the results have successfully established that extracting bark with water first followed by hexane will increase the total yield of extractives and increasing particle size decreases the total yield of the sequential extraction.
辐射松是新西兰外来人工造林的主要树种，用于生产建筑用木材以及纸浆和纸张。此外，加工过程会产生大量树皮副产品，这些树皮要么留在采伐现场，要么用于景观美化。辐射松树皮富含生化提取物，分别用亲水性和疏水性溶剂进行连续萃取后，可得到含有多酚和蜡质的提取物。以往的研究主要集中在溶剂类型、树皮与溶剂比例以及萃取时间等参数对提取物产量的影响上。然而，有两个参数始终保持不变：溶剂顺序（从亲脂性到疏水性）和粒径。本研究通过使用水和己烷两种溶剂，探讨了这两个参数对总产量和产品质量的综合影响。与先用己烷（10.53%和6.53%）相比，先用（11.74%和9.45%）水时，总提取物含量最高。己烷提取物的单产在2.25 - 2.9%之间，而水提取物的单产在4.30 - 9.24%之间。对提取物和残渣的化学分析表明没有质量上的差异，这表明树皮的萃取顺序不会改变提取物的成分。此外，研究结果成功表明，先用水萃取树皮，然后用己烷萃取，将提高提取物的总产量，而增大粒径会降低连续萃取的总产量。
