Crop and Soil Science Department , Oregon State University , Corvallis , Oregon 97331 , United States.
Department of Plant Sciences , University of Tennessee , Knoxville , Tennessee 37996 , United States.
J Agric Food Chem. 2018 Aug 22;66(33):8744-8752. doi: 10.1021/acs.jafc.7b04594. Epub 2018 Aug 13.
Dual production of biofuels and chemicals can increase the economic value of lignocellulosic bioenergy feedstocks. We compared the bioenergy potential of several essential oil (EO) crops with switchgrass ( Panicum virgatum L.), a crop chosen to benchmark biomass and lignocellulosic biofuel production. The EO crops of interest were peppermint ( Mentha × piperita L.), "Scotch" spearmint ( Mentha × gracilis Sole), Japanese cornmint ( Mentha canadensis L.), and sweet sagewort ( Artemisia annua L.). We also assessed each crop for EO production in a marginal production environment in Wyoming, USA, with irrigation and nitrogen (N) rates using a split-plot experimental design. Oil content ranged from 0.31 to 0.4% for Japanese cornmint, 0.23 to 0.26% for peppermint, 0.38 to 0.5% for spearmint, and the overall mean of sweet sagewort was 0.34%. Oil yields ranged from (in kg ha) 34 to 165 in Japanese cornmint, 25 to 108 in peppermint, 29.3 to 126 in spearmint, and 39.7 in sweet sagewort. EO production, but not composition, was sensitive to N fertilization. The alternative bioenergy crops and switchgrass produced similar amounts of ethanol from bench-scale simultaneous saccharification and fermentation assays. Value-added incomes from the EO proceeds were estimated to be between $1055 and $5132 ha from peppermint, $1309 and $5580 ha from spearmint, $510 and $2460 ha from Japanese cornmint, and $3613 ha from sweet sagewort under Wyoming growth conditions. The advantage of the proposed crops over traditional lignocellulosic species is the production of high-value natural products in addition to lignocellulosic biofuel production.
生物燃料和化学品的联产可以提高木质纤维素生物能源原料的经济价值。我们比较了几种精油（EO）作物与柳枝稷（ Panicum virgatum L.）的生物能源潜力，柳枝稷是一种用于生物质和木质纤维素生物燃料生产基准的作物。感兴趣的精油作物包括薄荷（ Mentha × piperita L.）、“苏格兰”薄荷（ Mentha × gracilis Sole）、日本薄荷（ Mentha canadensis L.）和青蒿（ Artemisia annua L.）。我们还在美国怀俄明州评估了每个作物在边缘生产环境中的精油生产情况，采用裂区实验设计，灌溉和氮（N）用量。日本薄荷的油含量在 0.31%至 0.4%之间，薄荷的油含量在 0.23%至 0.26%之间，薄荷的油含量在 0.38%至 0.5%之间，青蒿的总体平均值为 0.34%。油产量在日本薄荷中范围为（kg ha）34 至 165，在薄荷中为 25 至 108，在薄荷中为 29.3 至 126，在青蒿中为 39.7。精油的产量，而不是成分，对 N 施肥敏感。替代生物能源作物和柳枝稷在小规模同步糖化发酵试验中产生了相似量的乙醇。根据怀俄明州的生长条件，从薄荷中估计精油收益的附加值收入在 1055 美元至 5132 美元/公顷之间，从薄荷中估计精油收益的附加值收入在 1309 美元至 5580 美元/公顷之间，从日本薄荷中估计精油收益的附加值收入在 510 美元至 2460 美元/公顷之间，从青蒿中估计精油收益的附加值收入在 3613 美元/公顷。与传统木质纤维素物种相比，拟议作物的优势在于除了木质纤维素生物燃料生产外，还生产高附加值的天然产品。
