:: دوره 4، شماره 1 - ( 11-1395 ) ::
جلد 4 شماره 1 صفحات 33-40 برگشت به فهرست نسخه ها
Some Physicochemical and Rheological Properties of Zedo (Farsi) Gum Exudates from Amygdalus scoparia
چکیده:   (4677 مشاهده)

Background and Objectives: Zedo gum is exuded in three colours (white, yellow, and red) from Amygdalus scoparia. It is used in both food and non-food industries, as well as in traditional medicine. This study aimed to determine the physicochemical and rheological properties of Zedo gum.

Materials and Methods: Zedo gum was collected in Sirjan and classified into three groups, based on colour (samples W, Y, and R). Their soluble parts were separated by centrifuging the dispersions and freeze-drying the supernatants. Surface tension was determined using Du Nouy ring method and NMR spectroscopy was carried out using a Varian Inova-500 MHz spectrometer. Gel Permeation chromatography was used for determining molecular weight and rheological data were obtained with a Physica MCR 301 rheometer.

Results: Surface tension decreased as the concentration decreased, except for sample R that had a maximum point at 1 %. The molecular weight of sample W was the highest, while its dispersity was the lowest. NMR spectroscopy indicated that Ara residues variously were  linked to α-Araf residues, and Gal residues were determined as terminal α-Gal residues. Intrinsic viscosity values for samples W, Y, and R were 7.14±0.13, 6.45±0.11 and 5.40±0.15dl/gr, respectively. Rheological results showed that viscosity was inversely proportional to temperature and directly to concentration.

Conclusions: As three samples of Zedo gum had different characteristics, colour can be a good tool in trade.

Keywords: Zedo, Dispersity, GPC, Amygdalus Scoparia, NMR

متن کامل [PDF 617 kb]   (3516 دریافت)    
نوع مطالعه: پژوهشي | موضوع مقاله: تغذیه
دریافت: 1395/3/23 | پذیرش: 1395/10/26 | انتشار: 1395/10/26



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دوره 4، شماره 1 - ( 11-1395 ) برگشت به فهرست نسخه ها