Analysis And Identification Of Apocynum Fiber Composition Based On Infrared Spectroscopy Technology

Degumming is the primary link in the processing of apocynum bast fiber,and the determination of fiber gum composition is the key to evaluate the degumming process.Pectin,lignin and hemicellulose are the inner-layer structure of cells,which are difficult to remove and are the key research objects in microbial degumming.The traditional method for detecting the apocynum venetum gum composition need long cycle,the operation was complicated,the chemical reagents were large,and pollute the environment.Therefore,it is necessary to establish a rapid,simple,non-destructive and green method for the determination of apocynum fiber composition.In addition,with the development of apocynum venetum fiber finishing technology.How to realize the high-efficiency identification of high-value fiber is also an important issue for the promotion and application of apocynum venetum fiber.In this paper,the apocynum venetum fiber,which is a rare plant resource with Chinese characteristics,was used as the research object.The infrared spectrum technique was used to detect,analyze and identify the apocynum venetum fiber component.Based on data acquisition,data processing and numerical simulation,the apocynum venetum fiber infrared spectrum was constructed.Rapid evaluation of degumming effect of Apocynum venetum and accurate identification of Apocynum venetum fibers are realized.The near-infrared spectroscopy technique was used to detect the high-throughput content of apocynum venetum fiber,and the rapid evaluation technology of apocynum venetum fiber degumming effect was constructed.83 samples of apocynum venetum fibers with different degumming degree were prepared by traditional chemical degumming,biological degumming and alkali-oxygen one-bath degumming.The contents of pectin,hemicellulose and lignin in 83 apocynum venetum fibers were determined by traditional chemical methods.Near infrared spectra of 83 samples were collected by near infrared diffuse reflectance mode.The original spectrum has some problems,such as weak validated by the models.The model was used to predict the content of each component of the validation set.The results showed that the correlation coefficients of validation set for determination of pectin,hemicellulose and lignin in apocynum venetum fiber were 0.9293,0.8869 and 0.9002.Paired t-test showed that the P values of the three gum components were greater than 0.05,which indicated that the high throughput detection of pectin,hemicellulose and lignin in apocynum venetum fiber by near infrared spectroscopy was feasible.Apocynum venetum fibers were identified by one-dimensional spectrum and second derivative of mid-infrared spectrum.According to the difference of peak strength,peak position and peak shape of four kinds of fiber characteristic peaks to analyze.The results showed that apocynum venetum fiber could be distinguished from ramie,hemp and flax at 1717,1522,1457 and 721 cm-1 all four characteristic peaks in one-dimensional infrared spectroscopy,thus achieving the first-step identification of apocynum venetum fiber.Further analysis by second derivative spectroscopy showed that apocynum and green stem hemp fibers had characteristic peaks at 2915,2848,1473,1463,730 and 718 cm-1,and the peak intensity of apocynum venetum was the largest,while the other three kinds of fibers barely appeared,thus realizing the second-step identification of apocynum fibers.