Physicochemical properties of crude and purified locust bean gums extracted from Iranian carob seeds

Asgar Farahnaky, Nazanin Darabzadeh, Mahsa Majzoobi, Gholamreza Mesbahi

Research output: Contribution to journalArticle

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Abstract

In this research, seeds of Iranian carob trees grown wild in Kazeroon city (Fars Province) were used to extract Iranian locust bean gum as a seed galactomannan. Chemical composition, solubility, and rheological properties of crude and purified gums were investigated and compared with a commercial (Sigma) locust bean gum (LBG) sample. Chemical composition of the purified Iranian LBG was similar to the commercial LBG, however, the protein content of Iranian crude LBG was higher. Solubility data showed that the Iranian crude LBG was partially cold-water soluble (~ 55% at 25°C) and needed heating to reach a higher solubility value (~ 71% at 80 °C). Rheological properties of the solutions of the three LBG samples were investigated as a function of concentration and temperature (5-60 °C) at shear rate range of 0.5-200 s-1. All three samples showed shear thinning behavior and Power law model was used to fit the experimental data. The Iranian LBG (crude and pure) was able to thicken aqueous solutions; however, its viscosity level was lower than that of the commercial LBG. Study of rheological properties of the three LBG samples at different pH levels (2.5-10) showed that they were significantly affected by pH. The intrinsic viscosities of the Iranian crude and purified LBG and commercial LBG were 3.95, 9.05, and 9.48 dL g-1, respectively.
Original languageEnglish
Article number30
Pages (from-to)125-136
Number of pages12
JournalJournal of Agricultural Science and Technology
Volume16
Issue number1
Publication statusPublished - Jan 2014

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carob
locust bean gum
Seeds
physicochemical properties
seeds
rheological properties
solubility
Solubility
Viscosity
shears
viscosity
chemical composition
sampling
Gingiva
thinning (plants)
aqueous solutions
Heating

Cite this

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title = "Physicochemical properties of crude and purified locust bean gums extracted from Iranian carob seeds",
abstract = "In this research, seeds of Iranian carob trees grown wild in Kazeroon city (Fars Province) were used to extract Iranian locust bean gum as a seed galactomannan. Chemical composition, solubility, and rheological properties of crude and purified gums were investigated and compared with a commercial (Sigma) locust bean gum (LBG) sample. Chemical composition of the purified Iranian LBG was similar to the commercial LBG, however, the protein content of Iranian crude LBG was higher. Solubility data showed that the Iranian crude LBG was partially cold-water soluble (~ 55{\%} at 25°C) and needed heating to reach a higher solubility value (~ 71{\%} at 80 °C). Rheological properties of the solutions of the three LBG samples were investigated as a function of concentration and temperature (5-60 °C) at shear rate range of 0.5-200 s-1. All three samples showed shear thinning behavior and Power law model was used to fit the experimental data. The Iranian LBG (crude and pure) was able to thicken aqueous solutions; however, its viscosity level was lower than that of the commercial LBG. Study of rheological properties of the three LBG samples at different pH levels (2.5-10) showed that they were significantly affected by pH. The intrinsic viscosities of the Iranian crude and purified LBG and commercial LBG were 3.95, 9.05, and 9.48 dL g-1, respectively.",
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Physicochemical properties of crude and purified locust bean gums extracted from Iranian carob seeds. / Farahnaky, Asgar; Darabzadeh, Nazanin; Majzoobi, Mahsa; Mesbahi, Gholamreza.

In: Journal of Agricultural Science and Technology, Vol. 16, No. 1, 30, 01.2014, p. 125-136.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Physicochemical properties of crude and purified locust bean gums extracted from Iranian carob seeds

AU - Farahnaky, Asgar

AU - Darabzadeh, Nazanin

AU - Majzoobi, Mahsa

AU - Mesbahi, Gholamreza

N1 - Imported on 12 Apr 2017 - DigiTool details were: month (773h) = January; Journal title (773t) = Journal of Agricultural Science and Technology. ISSNs: 1680-7073;

PY - 2014/1

Y1 - 2014/1

N2 - In this research, seeds of Iranian carob trees grown wild in Kazeroon city (Fars Province) were used to extract Iranian locust bean gum as a seed galactomannan. Chemical composition, solubility, and rheological properties of crude and purified gums were investigated and compared with a commercial (Sigma) locust bean gum (LBG) sample. Chemical composition of the purified Iranian LBG was similar to the commercial LBG, however, the protein content of Iranian crude LBG was higher. Solubility data showed that the Iranian crude LBG was partially cold-water soluble (~ 55% at 25°C) and needed heating to reach a higher solubility value (~ 71% at 80 °C). Rheological properties of the solutions of the three LBG samples were investigated as a function of concentration and temperature (5-60 °C) at shear rate range of 0.5-200 s-1. All three samples showed shear thinning behavior and Power law model was used to fit the experimental data. The Iranian LBG (crude and pure) was able to thicken aqueous solutions; however, its viscosity level was lower than that of the commercial LBG. Study of rheological properties of the three LBG samples at different pH levels (2.5-10) showed that they were significantly affected by pH. The intrinsic viscosities of the Iranian crude and purified LBG and commercial LBG were 3.95, 9.05, and 9.48 dL g-1, respectively.

AB - In this research, seeds of Iranian carob trees grown wild in Kazeroon city (Fars Province) were used to extract Iranian locust bean gum as a seed galactomannan. Chemical composition, solubility, and rheological properties of crude and purified gums were investigated and compared with a commercial (Sigma) locust bean gum (LBG) sample. Chemical composition of the purified Iranian LBG was similar to the commercial LBG, however, the protein content of Iranian crude LBG was higher. Solubility data showed that the Iranian crude LBG was partially cold-water soluble (~ 55% at 25°C) and needed heating to reach a higher solubility value (~ 71% at 80 °C). Rheological properties of the solutions of the three LBG samples were investigated as a function of concentration and temperature (5-60 °C) at shear rate range of 0.5-200 s-1. All three samples showed shear thinning behavior and Power law model was used to fit the experimental data. The Iranian LBG (crude and pure) was able to thicken aqueous solutions; however, its viscosity level was lower than that of the commercial LBG. Study of rheological properties of the three LBG samples at different pH levels (2.5-10) showed that they were significantly affected by pH. The intrinsic viscosities of the Iranian crude and purified LBG and commercial LBG were 3.95, 9.05, and 9.48 dL g-1, respectively.

KW - Open access version available

KW - Consistency index, Carob seeds, Iranian LBG, Intrinsic viscosity, Rheology

M3 - Article

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SP - 125

EP - 136

JO - Journal of Agricultural Science and Technology

JF - Journal of Agricultural Science and Technology

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M1 - 30

ER -