مطالعة ساختاری لیگنین‌های چوب آسیاب‌شده (MWL) و دیوکسان چوب سرو با استفاده از روش DFRC

نویسندگان

1 استادیار گروه شیمی دانشکده علوم دانشگاه پیام‌نور، تهران، ایران

2 استاد گروه شیمی دانشکده علوم دانشگاه پیام‌نور، تهران، ایران

چکیده

در این مطالعه از روش "مشتق‌سازی – گسست ‌کاهشی" (DFRC) برای بررسی ساختار لیگنین چوب آسیاب‌‌شده (MWL) و لیگنین دیوکسان چوب سرو سیمین استفاده شد. با استفاده از این روش و نیز فنون طیف‌سنجی
13CNMR FT- و GC-Mass و کروماتوگرافی تراوش ژلی (GPC) ساختارهای تشکیل‌دهنده این دو نوع لیگنین مورد بررسی قرار گرفته و نتایج با یکدیگر مقایسه شده است. نتایج نشان داد که مهمترین واحدهای ساختاری در دو لیگنین فوق‌الذکر از شکسته ‌شدن پیوندها در موقعیت‌های ?-O-4 حاصل‌ می‌شوند. بر اساس این مشاهدات، مهمترین واحدهای ساختاری در لیگنین دیوکسان و لیگنین چوب آسیاب‌شده به‌ترتیب، 4- هیدروکسی-3- ‌متوکسی-1- فنیل پروپن و 4- هیدروکسی-3- ‌متوکسی-1- فنیل- پروپنال (ساختارهای گواییاسیل) می‌باشند.

کلیدواژه‌ها


عنوان مقاله [English]

The Structural Study of Milled Wood and Dioxane Lignin of Cupressus Sempervirens Using DFRC Method

نویسندگان [English]

  • Tayebeh Partovi 1
  • Sayyed Ahmad Mirshokraiee 2
چکیده [English]

In this study, derivatization followed by reductive cleavage (DFRC) method was used to investigate the structures of milled wood lignin and dioxane lignin of Spruce (Cupressus sempervirens). After performing DFRC reactions, the structures of constituents resulted from these two kinds of lignins were investigated by using Spectroscopic methods such as 13CNMR, GC-mass and gel permeation chromatography (GPC). The results obtained from chromatography and spectroscopy studies were compared. These comparative results show that the dominant structural components of these two kinds of lignin are obtained from the cleavage of ?-O-4 bonds. The main components obtained from dioxane lignin and milled wood lignin are 4-hydroxy-3-methoxy-1-phenyl propene and 4-hydroxy-3-methoxy-1-phenyl- propenal (guaiacyl structures), respectively.

کلیدواژه‌ها [English]

  • chromatography
  • Derivatization Followed by Reductive Cleavage Method (DFRC)
  • Dioxane Lignin
  • Milled Wood Lignin (MWL)
  • Spruce
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