influence of drying and extraction methods on yield and chemical composition of the essential oil of eucalyptus sargentii
نویسندگان
چکیده
many parameters affect essential oil yield and chemical composition of aromatic plants. for obtaining the highest quantity and quality of essential oil, it is necessary to know the proper methods of drying and distillation. the aim of this research was to investigate the influence of drying and extraction methods on the yield and chemical composition of the essential oil of eucalyptus sargentii. the fresh leaves of eucalyptus sargentii, cultivated in kashan (central region of iran), were collected in the middle of spring and dried by five different drying methods: sun-drying, shade-drying, and oven-drying at 30, 40 and 50°c. the essential oils of every treatment were obtained by hydro-distillation in three replication. in addition, the essential oil of shade-dried sample was obtained by two other distillation methods, namely, water- and steam-distillation and direct steam-distillation. the oils were analyzed by capillary gc and gc-ms. statistical analysis showed significant difference between oil yield (w/w) of the shade-dried sample (3.39%) compared to oven-dried at 40°c (2.92%), sun-dried (2.66%), oven-dried at 30°c (2.59%) and oven-dried at 50°c (2.30%). the oil content of the shade-dried sample obtained by hydro-distillation (3.39%) was higher than those of the water and steam distillation (2.89%) and steam distillation (1.35%). twenty-three components were identified in the oil of e. sargentii in the different drying methods, including 1,8-cineole (57.9-65.8%) and α-pinene (11.3-28.3%) as main components. twenty-four compounds were characterized in the oils of different distillation methods, including 1,8-cineole (61.2-66.6%) and α-pinene (19.7-28.3%) as the major compounds. among the different drying methods, shade-dried samples produced the highest oil yield and 1,8-cineole content, while in different distillation methods, hydro-distillation produced the highest oil yield, but the highest percentage of 1,8-cineole was obtained by water and steam distillation.
منابع مشابه
effect of seed priming and irrigation regimes on yield,yield components and quality of safflowers cultivars
این مطالعه در سال 1386-87 در آزمایشگاه و مزرعه پژوهشی دانشگاه صنعتی اصفهان به منظور تعیین مناسب ترین تیمار بذری و ارزیابی اثر پرایمینگ بر روی سه رقم گلرنگ تحت سه رژیم آبیاری انجام گرفت. برخی از مطالعات اثرات سودمند پرایمینگ بذر را بر روی گیاهان مختلف بررسی کرده اند اما در حال حاضر اطلاعات کمی در مورد خصوصیات مربوط به جوانه زنی، مراحل نموی، عملکرد و خصوصیات کمی و کیفی بذور تیمار شده ژنوتیپ های م...
on the comparison of keyword and semantic-context methods of learning new vocabulary meaning
the rationale behind the present study is that particular learning strategies produce more effective results when applied together. the present study tried to investigate the efficiency of the semantic-context strategy alone with a technique called, keyword method. to clarify the point, the current study seeked to find answer to the following question: are the keyword and semantic-context metho...
15 صفحه اولEffect of oven and shade drying methods on essential oil yield and chemical composition of Kelussia odoratissima Mozaff.
Background & Aim: Kelussiaodoratissima Mozaff is a valuable plant of Apiaceae family that is used as medicinal and aromatic herb. According to the importance of drying treatment on quality and quantity of essential oil, the effect of different drying methods on essential oil yield and chemical composition of Kelussia odoratissima Mozaff was examined in this research. ...
متن کاملEffect of oven and shade drying methods on essential oil yield and chemical composition of Kelussia odoratissima Mozaff.
Background & Aim: Kelussiaodoratissima Mozaff is a valuable plant of Apiaceae family that is used as medicinal and aromatic herb. According to the importance of drying treatment on quality and quantity of essential oil, the effect of different drying methods on essential oil yield and chemical composition of Kelussia odoratissima Mozaff was examined in this research. ...
متن کاملextraction and acetylation of purified trypsin from bovin pancreas and study of some its physico-chemical properties
آنزیم تریپسین در شرایط قلیایی ناپایدار می باشد .و فعالیت پروتئولیتیکی تریپسین منجربه خود هضمی آن در جایگاههای خاصی می گردد. بنابر این آنزیمی با ناپایداری بالا محسوب میگردد. در سالهای اخیر موفق شدند که با ایجاد تغیرات شیمیایی با اضافه کردن فلزات خاص ، کلسیم و یا عمل استیلاسیون منجر به افزایش پایداری آنزیم تریپسین گردند. مطالعات در حال حاضر نشان می دهد که تریپسین استیله شده فعالیت آنزیمی خود را ...
15 صفحه اولمنابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
journal of agricultural science and technologyناشر: tarbiat modares university
ISSN 1680-7073
دوره 14
شماره 5 2012
میزبانی شده توسط پلتفرم ابری doprax.com
copyright © 2015-2023