Adsorption isotherms in bleaching hazelnut oil

Bayrak, Yüksel

doi:10.1007/s11746-003-0833-7

Cited by 28 publications

(10 citation statements)

References 10 publications

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“…The higher the acid clay in bleaching, the lighter was the color of the roasted sesame oil. Pigments and brown gum materials in roasted sesame oil were removed by acid clay (Choe and Moon 1994;Rossi and others 2001;Bayrak 2003). Dark brown color of roasted sesame oil often deteriorates the original color of foods.…”

Section: Resultsmentioning

confidence: 99%

Effects of Bleaching on the Properties of Roasted Sesame Oil

Kim¹,

Choe²

2005

Journal of Food Science

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: Improvement in quality of roasted sesame oil was studied. Roasted sesame oil was bleached at 70 °C, 85 °C, or 100 °C for 20 min with acid‐activated clay at 0.5%, 1.0%, or 3.0% (w/w) and then centrifuging at 12096 × g at 4 °C for 10 min. The color of the roasted sesame oil became lighter and the viscosity of oil decreased by bleaching. Bleaching caused a significant increase in the smoke point of the oil, from 170 °C to a range of 183 °C to 191 °C. Bleaching increased palmitic acid and decreased linoleic acid contents of roasted sesame oil. Bleaching decreased free fatty acid (FFA) and conjugated dienoic acid (CDA) contents and carbonyl values (CV) of roasted sesame oil. The more the acid clay was used, the lower were the FFA and CDA contents and CV of the oil. Amount of acid clay in bleaching of roasted sesame oil had higher effects on the color, viscosity, smoke point, FFA and CDA contents, and CV of roasted sesame oil than the bleaching temperature. Bleaching did not show a significant effect on tocopherol contents of the sesame oil. Bleaching tended to decrease sesamolin contents and increase sesamol contents in the roasted sesame oil. As the amount of acid clay and the bleaching temperature increased, the contents of sesamin and sesamolin in the oil decreased while sesamol contents increased.

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Section: Resultsmentioning

confidence: 99%

Effects of Bleaching on the Properties of Roasted Sesame Oil

Kim¹,

Choe²

2005

Journal of Food Science

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“…N is related to the magnitude of the adsorption driving force and to the adsorbent site energy distribution [16]. The relative amount, X and the residual relative amount at equilibrium, X e , were obtained from the equations X = (A 0 -A e )/A 0 and X e = A e /A 0 , where A 0 is the absorbance of the neutralized oil; A e is the absorbance of the oil at equilibrium [17,18].…”

Section: Introductionmentioning

confidence: 99%

Effect of Attapulgite Pore Size Distribution on Soybean Oil Bleaching

Huang

Liu

et al. 2007

J Americ Oil Chem Soc

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The pore size distribution and specific surface area of the attapulgite is a crucial parameter for the uptake of pigments of oil. Bleaching of the soybean oil with three attapulgites with different pore size distribution, which were assigned a, b, and c, respectively was investigated. The specific surface area and the pore size distribution of the attapulgites were characterized. The Freundlich isotherm analysis was used to evaluate the sorption capacity of the three attapulgite. Sample b gave the highest surface area and sample c the lowest. Sample b exhibited a wider pore distribution (8-65 Å ) whereas samples a and c had more micropores smaller than 15 Å . Sample a, in contrast to samples b and c, was characterized by some larger pores (100-170 Å ). The sorption capacity followed the sequence: attapulgite sample c > attapulgite sample a > attapulgite sample b. The sorption capacity was decided by the pore size distribution. The more pores with a distribution range 8-32 Å (i.e., close to the diameter of the pigments), the more pigments were removed. The attapulgite sample c, which had most pores (8-32 Å ) was the best.

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“…The sorption of copper, therefore, could be as a result of more than one mechanism and that a degree of heterogeneity is possible for ionic species involved in the solution and on the surface. Physical adsorption due to Van der Waals forces of attraction could also have contributed to the interaction phenomenon [131]. Table 3 shows the results obtained for adsorption isotherm of lead ions.…”

Section: Freundlich Isothermsmentioning

confidence: 99%

Remediation of Some Selected Heavy Metals from Water Using Modified and Unmodified Mushrooms

Bii¹,

Mwangi²,

Wanjau³

et al. 2016

J Pollut Eff Cont

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The dispersal of toxic heavy metals by water from natural and anthropogenic is a worldwide environmental concern due to pollution. Despite some metals playing an important role in body, they are toxic when the level exceeds the tolerance limits while others such as lead have no known physiological value to human beings. Since heavy metals cannot be degraded, then their removal from drinking water is necessary. Mushrooms are readily available in Bomet County and their metal removal ability was investigated. The study aimed at removing heavy metals from water by adsorption using mushroom, as a cost-effective and sustainable method. The raw mushroom was modified with sodium hydroxide and characterization of both the parent material and its modified form was done using Fourier Transform Infrared spectrometry (FTIR). Sorption experiments were carried out using the batch adsorption method and sorption parameters including pH, contact time, adsorbent dose and initial metal ion concentration investigated. The results found out that the sorption capacity for cadmium ions ranged from 1.826-25.285 mg/g by the unmodified edible mushroom (UEM), the modified edible mushroom (EM), unmodified toxic mushroom (UTM) and modified toxic mushroom (TM). For copper ions, sorption capacity ranged from 0.002-4.097 mg/g, while that of the lead ions ranged from 1.345-2.593 mg/g by the UEM, EM, UTM and TM respectively. The sorption capacity showed improvement on modification as sorption of cadmium increased from 1.826-25.285 mg/g by the UEM, EM, UTM and TM. At a pH range of 4-6, the sorbent material was found to remove up to 90% of the metals. The sorbent material had a removal efficiency of 95% of the metals in less than 20 minutes. The UEM and UTM fitted well in Langmuir adsorption isotherm model for cadmium and lead ions. For copper ions, UEM, EM, UTM and TM fitted in the Freundlich model. TM for lead ions best fitted in the Freundlich model. The bio-sorption kinetics was determined by fitting first-order-Lagergreg and Pseudo-second-order kinetics models to the experimental data. It was found that the data for lead was better described by the pseudo-second-order model. For copper ion, the data was best described by Ho's pseudo second order for UEM and UTM, cadmium ions for all sorbents was best described by Lagergreg's first-order kinetics. The FTIR analysis suggested the possibility of the participation of carboxyl groups in metal uptake. The levels of dissolved organic carbon (DOC) were found to be 19.0 mg/L in the raw material and 2.19 mg/L after modification. It was confirmed that modification minimized secondary pollution. This indicated that mushrooms have a potential application for the remediation of metal polluted waters.

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Adsorption isotherms in bleaching hazelnut oil

Cited by 28 publications

References 10 publications

Effects of Bleaching on the Properties of Roasted Sesame Oil

Effects of Bleaching on the Properties of Roasted Sesame Oil

Effect of Attapulgite Pore Size Distribution on Soybean Oil Bleaching

Remediation of Some Selected Heavy Metals from Water Using Modified and Unmodified Mushrooms

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