Physico-chemical Characteristics and Oxidative Stability of Date-Pits Oil during Storage at Different Temperatures

2016 ◽  
Vol 12 (4) ◽  
pp. 385-393
Author(s):  
Naima Al-Kharousi ◽  
Mohammed Al-Khusaibi ◽  
Ismail Al-Bulushi ◽  
Nejib Guizani ◽  
Mostafa Waly ◽  
...  
Keyword(s):  
Oxidative Stability ◽  
Value Added ◽  
Stability Index ◽  
Acid Value ◽  
Food Ingredients ◽  
C Storage ◽  
Physico Chemical ◽  
Different Temperatures ◽  
The Stability ◽  
Date Pits

Abstract In this study, oxidative stability of date-pits (i. e. Khalas variety) was investigated during storage as a function of temperature. The stability of date-pits oil was determined by measuring acid value (AV), peroxide value (PV), p-anisidine value (PAV), tocopherol and oxidative stability index. Initial characteristics of oil were assessed by measuring its physico-chemical and melting characteristics, fatty acids composition and aflatoxin. Storage of date-pits caused highest reduction in linoleic acid (C18:2, ω6) followed by oleic acid (C18:1, ω9). AV, PV and PAV of the fresh oil were 1.41 mg KOH/g oil, 3.30 meq/kg oil and 0.60, respectively. These values increased linearly at slower rate in the case of 30 °C storage, while sharp rise was observed after 40 days in cases of 100 and 150 °C storage (p < 0.05). The results of this study indicate that date pits oil had a good oxidative and thermal stability and could thus be used to develop value-added food ingredients.

scholarly journals Process Optimization for Biodiesel Production from Corn Oil and Its Oxidative Stability

2010 ◽  
Vol 2010 ◽  
pp. 1-9 ◽  
Author(s):  
N. El Boulifi ◽  
A. Bouaid ◽  
M. Martinez ◽  
J. Aracil
Keyword(s):  
Storage Time ◽  
Catalyst Concentration ◽  
Corn Oil ◽  
Acid Value ◽  
Biodiesel Production ◽  
Chemical Parameters ◽  
Physico Chemical ◽  
Ester Yield ◽  
The Stability ◽  
Central Composite

Response surface methodology (RSM) based on central composite design (CCD) was used to optimize biodiesel production process from corn oil. The process variables, temperature and catalyst concentration were found to have significant influence on biodiesel yield. The optimum combination derived via RSM for high corn oil methyl ester yield (99.48%) was found to be 1.18% wt catalyst concentration at a reaction temperature of55.6∘C. To determine how long biodiesel can safely be stored, it is desirable to have a measurement for the stability of the biodiesel against such oxidation. Storage time and oxygen availability have been considered as possible factors influencing oxidative instability. Biodiesel from corn oil was stored for a period of 30 months, and the physico-chemical parameters of samples were measured at regular interval of time. Results show that the acid value (AV), peroxide value (PV), and viscosity (ν) increased while the iodine value (IV) decreased. These parameters changed very significantly when the sample was stored under normal oxygen atmosphere. However, theν, AV, and IV of the biodiesel sample which was stored under argon atmosphere were within the limit by the European specifications (EN 14214).

Stability of Ceftazidime and Heparin in Four Different Types of Peritoneal Dialysis Solutions

2018 ◽  
Vol 38 (1) ◽  
pp. 49-56 ◽  
Author(s):  
Surendra Kandel ◽  
Syed Tabish R. Zaidi ◽  
S. Troy Wanandy ◽  
Long C. Ming ◽  
Ronald L. Castelino ◽  
...  
Keyword(s):  
Peritoneal Dialysis ◽  
High Performance ◽  
Anticoagulant Activity ◽  
Storage Conditions ◽  
Color Changes ◽  
Physico Chemical ◽  
Different Temperatures ◽  
The Stability ◽  
Dialysis Solutions ◽  
Potential Use

Background Intraperitoneal (IP) administration of ceftazidime is recommended for the treatment of peritoneal dialysis-associated peritonitis (PDAP) from Pseudomonas. Patients with PDAP may also need IP heparin to overcome problems with drainage of turbid peritoneal dialysis (PD) fluids and blockage of catheters with fibrin. Physico-chemical stability of ceftazidime and heparin, and biological stability of heparin in many types of PD solutions is unknown. Therefore, we investigated the stability of ceftazidime and heparin in 4 types of PD solutions. Methods A total of 12 PD bags (3 for each type of solution) containing ceftazidime and heparin were prepared and stored at 4°C for 120 hours, and then at 25°C for 6 hours, and finally at 37°C for 12 hours. An aliquot was withdrawn after predefined time points and analyzed for the concentration of ceftazidime and heparin using high-performance liquid-chromatography (HPLC). Samples were assessed for pH, color changes, particle content, and anticoagulant activity of heparin. Results Ceftazidime and heparin retained more than 91% of their initial concentration when stored at 4°C for 120 hours followed by storage at 25°C for 6 hours and then at 37°C for 12 hours. Heparin retained more than 95% of its initial activity throughout the study period. Particle formation was not detected at any time under the storage conditions. The pH and color remained essentially unchanged throughout the study. Conclusions Ceftazidime-heparin admixture retains its stability over long periods of storage at different temperatures, allowing its potential use for PDAP treatment in outpatient and remote settings.

scholarly journals Goldenberry (Physalis peruviana L.) seed oil: press extraction, optimization, characterization, and oxidative stability

2021 ◽  
Vol 33 (4) ◽  
pp. 107-117
Author(s):  
Pedro P. Ugarte-Espinoza ◽  
Victor Delgado-Soriano ◽  
Lorenzo Estivi ◽  
Alyssa Hidalgo ◽  
Gloria Pascual-Chagman
Keyword(s):  
Moisture Content ◽  
Oil Recovery ◽  
Stability Index ◽  
Acid Value ◽  
Volatile Matter ◽  
High Linoleic Acid ◽  
Oil Stability Index ◽  
Physalis Peruviana ◽  
Different Temperatures ◽  
Face Centered

In order to optimize the screw-press extraction conditions of oil from goldenberry (Physalis peruviana L.) seeds obtained from nectar processing waste, a face centered design was applied. The oil was extracted at different temperatures (60, 80, and 100°C) and seed moisture contents (8, 10, and 12%). Oil recovery (OR) increased and residual oil in the cake decreased significantly as moisture content and temperature were reduced; oil moisture and volatile matter as well as acid value, K232, K268, and p-anisidine, respectively, decreased proportionally with the moisture extraction. Thus, the highest OR (86.4%) and the best quality were obtained at 8% moisture content and 60°C pressing temperature. Under these conditions, the extracted oil presented high linoleic acid (76.0%), iodine value (140.0 mg I2/g), and refractive index (1.4769). The oil stability index, measured by Rancimat, varied from 3.65 h (120°C) to 14.87 h (100°C); the predicted shelf life at 25°C was 120.4 days and the activation energy was 85.6 kJ/mol. The results highlighted that screw-pressing of goldenberry seeds provides quality oil without employing polluting and hazardous solvents.

scholarly journals The evaluation of stability of Czech and Slovak banks

2018 ◽  
Vol 9 (2) ◽  
pp. 205-223
Author(s):  
Kristina Kocisova ◽  
Beata Gavurova ◽  
Marcel Behun
Keyword(s):  
Banking Sector ◽  
Banking System ◽  
Value Added ◽  
Stability Index ◽  
Financial Indicators ◽  
Z Score ◽  
Banking Stability ◽  
Two Measures ◽  
The Stability ◽  
Main Components

Research background: Commercial banks could affect the stability of the whole banking system due to the way they carry out their business activities. The supervision authorities play a key role in protecting banking stability by ensuring banks´ resilience to shocks, ability to recover their position in response to crisis and ultimately the supervision authorities help prevent failure of these banks. Therefore, in recent years’ researchers have been trying to define conditions that could guarantee stability of banks. Purpose of the article: This paper aims to describe the methodology used to measure banking stability, namely banking stability index (BSI) and Z-score. In the first part, we present the literature review, then we try to assess the stability in the condition of the Czech Republic and Slovakia during the period 2006–2016. Methods: The BSI is constructed according to the methodology presented by Ghosh (2011), taking into account the main components, which are described by the set of financial indicators of banks. Findings & Value added: Results showed that the average BSI in the whole sample moved from 0.20454 (in 2015) to 0.2486 (in 2007). The results according to countries have showed that the tendency of development in the Czech and Slovak banking sector was the same. At the beginning of the analyzed period, the Slovak banks were more stable compared to Czech ones. Since 2009 the situation has been different, where the Czech banks could be considered as more stable compared to Slovak ones. The tendency of development of Z-score in both countries could be considered as the same, without the 2009 year, when the Czech banks significantly strengthened their capitalization, which influenced the development of Z-score. The results of correlation analysis between Z-score and BSI pointed to the fact that there was no high correlation between these two measures, therefore it is appropriate to use both methodologies for stability evaluation.

scholarly journals Selenium in Germinated Chickpea (Cicer arietinum L.) Increases the Stability of Its Oil Fraction

Plants ◽  
2019 ◽  
Vol 8 (5) ◽  
pp. 113 ◽  
Author(s):  
Daniela Guardado-Félix ◽  
Sergio O. Serna-Saldivar ◽  
Janet A. Gutiérrez-Uribe ◽  
Cristina Chuck-Hernández
Keyword(s):  
Sodium Selenite ◽  
Seed Oil ◽  
Stability Index ◽  
Selenium Concentration ◽  
Acid Value ◽  
Cicer Arietinum L ◽  
Oil Fraction ◽  
Oxidative Stability Index ◽  
The Stability ◽  
Excellent Source

Selenium is an essential mineral in human nutrition. In order to assess its effect on the stability of chickpea oil, seeds were germinated and tested with different amounts of sodium selenite (0.0, 0.5, 1.0 and 2.0 mg/100g seeds) for four days. Oil was extracted from sprouted chickpea and its physical properties, fatty acid profile (FAME), oxidative stability index (OSI), lipase and lipoxygenase (LOX) activities, cellular antioxidant activity (CAA), and phenolics and carotenoids were assessed and compared to chickpea seed oil. The amount of chickpea oil and its acid value (AV) increased during germination. The OSI increased by 28%, 46% and 14% for 0.5, 1.0 and 2.0 mg/100g compared with non-selenium treated sprouts. Phenolics increased up to 36% and carotenoids reduced by half in germinated sprouts with and without selenium compared to seeds. Carotenoids increased by 16% in sprouts treated with 1.0 mg/100 g selenium compared to their counterparts without selenium. FAME was not affected by treatments but samples with the highest selenium concentration increased lipase activity by 19% and decreased lipoxygenase activity by 55% compared with untreated sprouts. The CAA of oils increased by 43% to 66% in all germinated treatments compared with seeds. Results suggest that Se-enriched chickpea sprouts could represent an excellent source of oil with a high OSI and CAA, associated with a reduction in LOX activity and an increase in phenolics, respectively.

scholarly journals Evaluation of oxidative stability, fatty acid profile and quality physico-chemical parameters of Brazil nut, coconut and Palm oils

2020 ◽  
Vol 42 ◽  
pp. e19
Author(s):  
Eliane Ferreira de Souza ◽  
Ronaldo Dos Santos Silva ◽  
Mikaelly Nayara Santos ◽  
Cinthia Aparecida de Andrade Silva ◽  
Antonio Rogério Fiorucci
Keyword(s):  
Oleic Acid ◽  
Fatty Acid ◽  
Oxidative Stability ◽  
Fatty Acid Profile ◽  
Palm Oil ◽  
Coconut Oil ◽  
Stability Index ◽  
Acid Value ◽  
Brazil Nut ◽  
Brazil Nuts

The aim of this study was to assess the oxidative stability (OS) of oils Brazil nuts, coconut and palm, as well as determine the quality parameters: acid value (AV), humidity, ash content, and fatty acid profile (FA). According to the results the oils of Brazil nuts, coconut and palm oil showed AV of 2.02, 2.49 and 5.92 mg KOH g-1, humidity of 0.060, 0.101 and 0.040% and ash of 0.010, 0.005 and 0.009%, respectively. Considering FA, the Brazil nut oil showed greater amount of linoleic acid (38.61%) and oleic acid (31.95%) in its composition. While in coconut oil the major amounts were lauric acid (35.22%) and myristic (17.43%) and in the palm oil, oleic acid (48.30%) and palmitic (28.67%). The OS analysis showed that there is a relationship between the FA chemical composition of each oil and oxidative stability index (OSI) that relates to the resilience capacity to lipid degradation.

scholarly journals Physico-chemical studies of some aminobenzoic acid hydrazide complexes

2004 ◽  
Vol 69 (4) ◽  
pp. 255-264 ◽  
Author(s):  
Abd El ◽  
Abd El ◽  
Gamel El ◽  
Abd El
Keyword(s):  
Acid Hydrazide ◽  
Conductometric Titration ◽  
Aminobenzoic Acid ◽  
X Ray ◽  
Physico Chemical ◽  
Coordination Process ◽  
Different Temperatures ◽  
Chemical Studies ◽  
The Stability ◽  
Thermal Stability Of

The stability constants and related thermodynamic functions characterizing the formation of divalent Ni, Cu, Zn, Cd and Hg complexes with o- and p-aminobenzoic acid hydrazide were determined potentiometrically at different temperatures. The formations of the complexes are endothermic processes. The formed bonds are mainly electrostatic. Conductometric titration was carried out to determine the stoichiometry and stability of the formed complexes. The structures of complexes were characterized by their IR, 1H-NMR and 13C-NMR spectra, as well as X-ray diffractograms. The coordination process takes place through the carbonyl group and the terminal hydrazinic amino group. The thermal stability of the complexes was followed in the temperature range 20?600 ?C.

scholarly journals Nanoemulsion of Sesame Seeds Oil: Preparation, Evaluation and Stability

2019 ◽  
Vol 31 (12) ◽  
pp. 3004-3008
Author(s):  
A.A. El-Refai ◽  
M.M. Rabie ◽  
Rania E. El-Gammal ◽  
W.A. Al-Saban
Keyword(s):  
Droplet Size ◽  
Chemical Properties ◽  
Sesame Seed ◽  
Acid Value ◽  
Sesame Oil ◽  
Oil Emulsion ◽  
Sesame Seeds ◽  
Physico Chemical ◽  
Sesame Seed Oil ◽  
The Stability

This work aims to study the effect of using nanoemulsion particles on the stability of sesame seed oil emulsion. During the roasting process of sesame seeds (Sohage-1), some physico-chemical properties of sesame seeds and its oil were determined. The moisture, protein and fiber contents were decreased whereas oil, ash and arbohydrates contents were increased. Sesame oil was extracted from roasted sesame seeds using mechanical pressing; some physico-chemical properties for extracted oil were determined. Results indicated that colour, acid value, free fatty acids (%), peroxide and hydrolysis values were increased, while saponification value was decreased in sesame oil. Also traditional and nanoemulsions form of sesame oil were prepared. Characterization of these emulsions particles was conducted using zeta potential and transmission electron microscope (TEM). The results also indicated that small droplet size of nanoemulsion particles being 26.28 nm in emulsion which prepared by using nano-technique as compared with those of 638.8 nm in traditional emulsion type and low polydispersity index (PDI) was nanoemulsion particles 0.266. This lead to more uniformity in droplet size thus could improve the stability of emulsion system. The TEM results of nanoemulsion particles of sesame oil showed that spherical droplets and nearly similarity in shape in nanoemulsion in compared with semi-spherical and varied particles size in traditional one. Creaming index, centrifugation test, conductivity and freeze-thaw cycles were used to evaluate all type of prepared emulsion stability. The nanoemulsion particles of sesame oil were found to be more stable than those of traditional one. These results indicated that the nanoemulsion process could increase the stability of prepared emulsion. Thus, using of nanoemulsion technique could be used as commercial way to enhance the stability of prepared emulsion.

scholarly journals Effect of the type of packaging on the oxidative stability of pine nuts (Pinus pinea L.) grown in Chile

2018 ◽  
Vol 16 (1) ◽  
pp. 255-262 ◽  
Author(s):  
Henríquez ◽  
Loewe ◽  
Saavedra ◽  
Córdova ◽  
Lutz
Keyword(s):  
Oxidative Stability ◽  
Shelf Life ◽  
Principal Component ◽  
Acid Value ◽  
Pinus Pinea ◽  
Packaging Materials ◽  
Life Study ◽  
Pine Nut ◽  
Wide Range ◽  
Different Temperatures

Pine nut (Pinus pinea L.) is a nutritious, expensive tree nut. During storage, it is exposed to a wide range of environmental deteriorative conditions. This study describes the oxidative stability of pine nuts kept in pouches made of three different packaging materials and stored at three different temperatures. The packaging materials evaluated were low-density polyethylene (LDP), high-density polyethylene (HDP), and high-barrier metallized film (MF). Temperatures evaluated were 4, 20, and 60°C. In addition, a control unpacked sample was also evaluated in identical conditions. The oxidative parameters evaluated were acid value and peroxide value. Data analyses include a shelf-life study and a principal component analysis. The results obtained indicate what the best packaging material at 20°C was MF with a shelf-life of 703 d. At 4°C, the shelf-life of pine nuts stored in HDP was 1148 d. It is concluded that it is fundamental to use an adequate packaging to protect the seeds from environmental conditions that promote deterioration.

scholarly journals The evaluation of stability of Czech and Slovak banks

2018 ◽  
Vol 9 (2) ◽  
pp. 205-223
Author(s):  
Kristina Kocisova ◽  
Beata Gavurova ◽  
Marcel Behun
Keyword(s):  
Banking Sector ◽  
Banking System ◽  
Value Added ◽  
Stability Index ◽  
Financial Indicators ◽  
Z Score ◽  
Banking Stability ◽  
Two Measures ◽  
The Stability ◽  
Main Components

Research background: Commercial banks could affect the stability of the whole banking system due to the way they carry out their business activities. The supervision authorities play a key role in protecting banking stability by ensuring banks´ resilience to shocks, ability to recover their position in response to crisis and ultimately the supervision authorities help prevent failure of these banks. Therefore, in recent years’ researchers have been trying to define conditions that could guarantee stability of banks. Purpose of the article: This paper aims to describe the methodology used to measure banking stability, namely banking stability index (BSI) and Z-score. In the first part, we present the literature review, then we try to assess the stability in the condition of the Czech Republic and Slovakia during the period 2006–2016. Methods: The BSI is constructed according to the methodology presented by Ghosh (2011), taking into account the main components, which are described by the set of financial indicators of banks. Findings & Value added: Results showed that the average BSI in the whole sample moved from 0.20454 (in 2015) to 0.2486 (in 2007). The results according to countries have showed that the tendency of development in the Czech and Slovak banking sector was the same. At the beginning of the analyzed period, the Slovak banks were more stable compared to Czech ones. Since 2009 the situation has been different, where the Czech banks could be considered as more stable compared to Slovak ones. The tendency of development of Z-score in both countries could be considered as the same, without the 2009 year, when the Czech banks significantly strengthened their capitalization, which influenced the development of Z-score. The results of correlation analysis between Z-score and BSI pointed to the fact that there was no high correlation between these two measures, therefore it is appropriate to use both methodologies for stability evaluation.

Sign in / Sign up

Export Citation Format

Share Document