摘要:

not available

ISSN:1923-4287    

DOI:10.1139/cjr42b-006

出版商:NRC Research Press    

年代:1942

数据来源: NRC

摘要:

A study of the effect of initial drying temperature on the apparent lignin content of various succulent plant tissues has been made. Air-drying, dryingin vacuoat 60 °C., air-drying after removal of constituents soluble in cold water and in cold dilute ethanol, and oven-drying at 105 °C. have been compared.Drying of immature or succulent tissues at 105 °C. results in a markedly higher apparent lignin content (as determined by the 72% sulphuric acid method) than is obtained after drying under the other conditions specified. This difference may be of especial importance when it is desired to compare the lignin contents of tissues of different degrees of maturity, or which have received different treatments, as in comparison of ensiled with non-ensiled materials.The nitrogen and methoxyl contents of the lignin preparations isolated indicate that drying at 105 °C. results in the inclusion of nitrogenous or carbohydrate materials, or both, in the lignin fraction. Evidence that the interfering substances are mainly easily soluble and removable prior to desiccation was obtained. It is indicated that non-lignin methoxyl may be present in lignin preparations prepared from tissues dried at 105 °C.

ISSN:1923-4287    

DOI:10.1139/cjr42b-007

出版商:NRC Research Press    

年代:1942

数据来源: NRC

摘要:

Seven known alkaloids have been isolated fromCorydalis montana(Engelm.) Britton, namely: protopine,dl-tetrahydro-palmatine, corydaline, capauridine, capaurine, scoulerine, and capaurimine. Two new bases have been isolated. One of these, alkaloid F57, was obtained by reduction of a quaternary base which itself could not be obtained crystalline.C.aureahas also yielded the same base. It is represented by C18H21O3N containing three methoxyls. The second new base, alkaloid F56, is represented by C23H27O6N containing four methoxyl groups.It is pointed out that the chemical differences betweenC.aureaandC.montanaare of sufficient magnitude to allocate specific rank to each plant.

ISSN:1923-4287    

DOI:10.1139/cjr42b-008

出版商:NRC Research Press    

年代:1942

数据来源: NRC