Determination of 5-hydroxymethylfurfural after Winkler and by the HPLC method for authentication of honey

2006 ◽  
Vol 60 (3) ◽  
Author(s):  
K. Kukurova ◽  
J. Karovičová ◽  
G. Greif ◽  
Z. Kohajdová ◽  
J. Lehkoživová
Keyword(s):  
Electrical Conductivity ◽  
Physicochemical Parameters ◽  
Separation Efficiency ◽  
Hplc Method ◽  
Total Acidity

AbstractThe quality and authenticity of commercially available honey from Slovak market and the development of HPLC method for determination of hydroxymethylfurfural (HMF) content of honey with fine separation efficiency, sensitivity, applicability, and recovery was evaluated.Physicochemical parameters (moisture, total acidity, content of proline, saccharides, and value of electrical conductivity) have been determined.

Determination of Nitrophenol Isomers in Water

2015 ◽  
Vol 1083 ◽  
pp. 80-83
Author(s):  
Xiao Na Ji ◽  
Sheng Shu Ai ◽  
Juan Tang ◽  
Hong Qu ◽  
De Jun Bian
Keyword(s):  
Separation Efficiency ◽  
Tap Water ◽  
Target Object ◽  
Hplc Method ◽  
The Other ◽  
Municipal Sewage ◽  
External Standard Method ◽  
External Standard ◽  
High Separation

This paper establishes the HPLC method of determining three nitrophenol isomers in municipal sewage, surface water and tap water. After the sample is filtered and distilled, conduct the monitoring analysis on the distillate with HPLC-DAD and quantify it in external standard method. In the municipal sewage treated in bioanalysis method one type of target object o-nitrophenol is found, whose content is 0.11mg·L-1, no target object is found in all the other samples. This method has the adventages of high separation efficiency and high analysis rate. The experiment result shows that the linear correlation coefficient is above 0.983, the recovery rate lies between 78.6% and 105.2%, the minimum detection limit is 0.05mg·L-1(S/N=3.0).

scholarly journals Evaluation of 5-Hydroxymethylfurfural (HMF) Concentration and Physicochemical Properties in Fresh and Aged Tualang Honey

2020 ◽  
Vol 4 (2) ◽  
pp. 10-16
Author(s):  
Siti Nurfarhana Sabireen ◽  
Siti Amrah Sulaiman ◽  
Rabeta Mohd Salleh ◽  
Wan Ezumi Mohd Fuad
Keyword(s):  
Moisture Content ◽  
Physicochemical Properties ◽  
Chemical Reactions ◽  
High Performance ◽  
Hplc Method ◽  
Human Consumption ◽  
Total Acidity ◽  
Storage Duration ◽  
Tualang Honey

The quality and purity of honey are generally indicated by the physicochemical properties including 5-hydroxymethylfurfural (HMF) level, a neo-formed contaminant with genotoxic potential. The concentration of HMF in honey usually increases as storage duration prolonged. This study investigated the differences in the physicochemical properties and the HMF concentration of fresh (stored within six months) and aged (stored for four years) tualang honey (TH), as well as the correlation between these two main parameters. Each of the physicochemical properties of TH was evaluated using standard established protocols. Meanwhile, the determination of HMF concentrations was conducted using High Performance Lipid Chromatography (HPLC) method. Results obtained indicated that the HMF contents in fresh TH (27 mg/kg) was found to be lower whereas aged TH sample contained greatly higher concentration (1426 mg/kg) when compared to the international recommended value of HMF for tropical honeys (< 80 mg/kg). The physicochemical properties (pH, free acids, lactones, total acidity and moisture content) of TH showed significant correlation with HMF concentration. These parameters could be used as rapid assessments for TH quality from different storage periods. The current findings suggest that there were significant modifications in the chemical reactions between TH of different storage durations. TH stored for four years might be not suitable and safe for human consumption. Keywords: physicochemical properties, 5-hydroxymethylfurfural, aged honey, storage duration

scholarly journals Development of a complex of detergents for membrane units in the dairy industry

2021 ◽  
Vol 14 ◽  
pp. 89-99
Author(s):  
Y.V. Matveichuk ◽  
◽  
D.V. Stanishevskii ◽  
Keyword(s):  
Electrical Conductivity ◽  
Mass Fraction ◽  
Dairy Industry ◽  
Total Acidity ◽  
Microbiological Contamination ◽  
Acid Base ◽  
Redox Titration ◽  
Dairy Plant ◽  
Active Substances

Aim. Development of a complex of detergents (acidic, alkaline, enzymatic, chlorine-containing, surfactant-containing additives) for membrane units used in the dairy industry. Materials and Methods. Methods for controlling the concentration of active substances in concentrates of agents are given on the example of KATELON 202 - determination of total acidity by the method of acid-base potentiometric titration (in terms of HNO3) and KATELON 114 – determination of the mass fraction of active chlorine by redox titration. Results. A complex of detergents for membrane plants (ultrafiltration (UV, UF), microfiltration (MF, MF), nanofiltration (NF, NF), reverse osmosis (RO, RO)), used in the dairy industry and including alkaline non-foaming, medium-, low-foam products KATELON 109, KATELON 110, KATELON 115; alkaline chlorine-containing non-foamy agent KATELON 114; acid non-foamy KATELON 202, KATELON 207, KATELON 208; high-foam neutral additives KATELON 308 and KATELON 309 – enhancers of the washing effect for KATELON 109, KATELON 110, KATELON 115; preservative non-foaming additive KATELON 310 for protection from microbiological contamination; enzyme medium supplement KATELON 601. The composition of all products, their brief characteristics and physicochemical indicators, as well as an approximate program of washing with a complex of developed preparations are given. The dependences of pH and electrical conductivity were obtained for KATELON 109, KATELON 110, KATELON 115, KATELON 202, KATELON 207, KATELON 208. Conclusion. The complex of detergents is successfully used at Kopylsky Butter Cheese Plant, Lyubansky Cheese Making Plant, Minsk Dairy Plant No. 1, Verkhnedvinsky Butter and Cheese Plant, Molodechno Dairy Plant, Volozhin production site of Minsk Dairy Plant No. 1, Tolochin Branch of Lepel Dairy Canning Plant.

scholarly journals Classification of Honeys From Three Geographical Regions Based on Their Quality Control Data

2012 ◽  
Vol 5 (1-2) ◽  
Author(s):  
Slavica Grujić ◽  
Jasmin Komić
Keyword(s):  
Electrical Conductivity ◽  
Bosnia And Herzegovina ◽  
Physicochemical Parameters ◽  
Black Locust ◽  
Refraction Index ◽  
Quality Level ◽  
North West ◽  
The North ◽  
Geographical Regions

Characterisation of commercial honeys is a hard task initiated in response to consumers’ demands. They demand basic quality level and determination of geographical and botanical origin. During processing and bottling of honey, there is a possibility of mixing honeys from various origins and quality. The processing could cause honey alterations that can affect the properties and quality, due to the adulteration of high quality honey types with a lower price natural honey. Control of honey requires determination of parameters that could unequivocally establish origin and improve honey characterisation. Nineteen physicochemical parameters (water content, ash, content of Zn, Cd, P, Fe, Cu, Mn, Mg, K, Na, refraction index, density, electrical conductivity, pH, free-acidity, percentage of total sugars, fructose and glucose, and sucrose) were analyzed in 194 samples of 7 nectar honey types (Amorpha, Black Locust, Black Locust and Multifloral, Chestnut, Chestnut and Multifloral, Bast-small-leaved lime and White Linden, Multifloral) from three geographical regions of the North-West Bosnia and Herzegovina. The aim of the study was to find which physicochemical parameters correlated to the geographical origin of the honey. After applying the one-way analysis of variance - ANOVA statistical comparison of analytically measured physicochemical parameters for a given honey types and Turkey’s Multiple Comparison HSD Test, the results showed that the content of ash, Cd, Mn, Mg, K, pH and electrical conductivity was useful for discriminating honeys from three geographical regions of the North-West Bosnia and Herzegovina.

scholarly journals Multiple Linear Regression (MLR) Model: A Tool for Water Quality Interpretation

2020 ◽  
Vol 12 (1) ◽  
pp. 123-134
Author(s):  
Ogbozige F. J ◽  
Toko M. A ◽  
Arawo C.C
Keyword(s):  
Water Quality ◽  
Electrical Conductivity ◽  
Physicochemical Parameters ◽  
Tap Water ◽  
Chloride Ion ◽  
Total Hardness ◽  
Uncoated Steel ◽  
Borehole Water ◽  
Black Plastic

The lack of standard water analysis equipment as well as inadequate trained personnel especially in the developing countries has discouraged many researchers in such countries to execute water quality researches. Hence, this paper presents developed mathematical relationship among some physicochemical parameters in order to aid the determination of the concentrations of certain parameters with the use of minimal equipment. This was achieved by weekly analyzing 7 physicochemical parameters of two sources of potable water (tap water and borehole water) stored in different containers for a period of 6 weeks using standard methods. The storage containers used were black plastic tank, blue plastic tank, green plastic tank, coated steel metal tank, uncoated steel metal tank and clay pot. The parameters examined were turbidity, electrical conductivity (EC), pH, alkalinity, chloride ion (Cl-), dissolved oxygen (DO) and total hardness. Results showed that the relationship between electrical conductivity (EC), alkalinity (Alk), total hardness (TH) and chloride ion (Cl-) is given as; EC = -224.8066493 + 6.244028022(Alk) + 0.28204735(TH) + 0.000518108(Cl-). A programing language was written on the models using Visual Basic.Net (VB.Net) version 2018. Keywords: Water, Physicochemical, Parameters, Function, Equation.

scholarly journals CHARACTERIZATION OF SERBIAN SUNFLOWER HONEYS BY THEIR PHYSICOCHEMICAL CHARACTERISTICS

2021 ◽  
Author(s):  
Nenad Popov ◽  
Milica Živkov Baloš ◽  
Sandra Jakšić ◽  
Vladimir Polaček
Keyword(s):  
Electrical Conductivity ◽  
Water Content ◽  
Physicochemical Parameters ◽  
Mass Fraction ◽  
Physicochemical Characteristics ◽  
Total Acidity ◽  
Mean Values ◽  
Significant Difference ◽  
The Mean

Abstract: Five physicochemical parameters (water content, electrical conductivity, total acidity (pH), ash mass fraction and concentration of free acids) were analyzed in 15 sunflower honeys collected from several localities in Vojvodina, Republic of Serbia. The mean values of analyzed honeys were: water content 16.87%; concentration of free acids 27.43 mEq/kg; electrical conductivity 0.34 mS/cm; pH 3.64. The selected physicochemical characteristics of all honey samples from Serbia analyzed in this research can be considered to be within the parameters expected for sunflower honey in general. The values for ash mass fraction, electrical conductivity and concentration of free acids in all sunflower honey samples showed similar trends. High correlation was established between electrical conductivity and ash mass fraction. Statistically significant difference at p≤0.05 (p=0.017) was established only for average values of free acids concentration between honey samples originating from the localities Kanjiža and Čelarevo. All of the analyzed honeys were found to meet national and European legislation for all investigated parameters. Therefore, further research on physicochemical properties of sunflower honey is required to confirm the quality and authenticity of this product and for better understanding the benefits of this honey.

Determination of the Common Phenolic Endocrine Disrupting Chemicals in the Water

2014 ◽  
Vol 1073-1076 ◽  
pp. 558-561
Author(s):  
Xiao Na Ji ◽  
Yan Zuo ◽  
Qing Kai Ren ◽  
Xue Hua Zhang ◽  
De Jun Bian
Keyword(s):  
Surface Water ◽  
Separation Efficiency ◽  
Limit Of Detection ◽  
Tap Water ◽  
Endocrine Disrupting Chemicals ◽  
Hplc Method ◽  
Municipal Sewage ◽  
External Standard Method ◽  
Endocrine Disrupting

This paper established a HPLC method of determining two common types of phenols endocrine disrupter (pEDCs) in municipal sewage, surface water and tap water. After the sample is filtered and distilled, the distillate is detected with HPLC-DAD, and quantified in external standard method. In the municipal sewage, surface water and tap water Bisphenol-A (BPA) and 4-octyl phenol (4-OP) are not found. The experiment result shows the linearly dependent coefficient (R2 ) is 0.9914 and 0.9870 respectively, the recovery lies between 89.7-95.6%, the limit of detection is 0.001 (S/N=4.0) and 0.010mg·L-1 (S/N=2.5) respectively. This method has a high separation efficiency and a rapid analysis speed.

scholarly journals Characterization of Serbian sunflower honeys by their physicochemical characteristics

2021 ◽  
Vol 48 (1) ◽  
pp. 1-8
Author(s):  
Milica Živkov-Baloš ◽  
Sandra Jakšić ◽  
Nenad Popov ◽  
Vladimir Polaček
Keyword(s):  
Electrical Conductivity ◽  
Water Content ◽  
Physicochemical Parameters ◽  
Mass Fraction ◽  
Physicochemical Characteristics ◽  
Total Acidity ◽  
Mean Values ◽  
Significant Difference ◽  
The Mean

Five physicochemical parameters (water content, electrical conductivity, total acidity (pH), ash mass fraction and concentration of free acids) were analyzed in 15 sunflower honeys collected from several localities in Vojvodina, Serbia. The mean values of analyzed honeys were: water content 16.87%; concentration of free acids 27.43 mEq/kg; electrical conductivity 0.34 mS/cm; pH 3.64 and ash mass fraction 0.13%. The selected physicochemical characteristics of all honey samples from Serbia analyzed in this research can be considered to be within the parameters expected for sunflower honey in general. The values for ash mass fraction, electrical conductivity and concentration of free acids in all sunflower honey samples showed similar trends. High correlation was established between electrical conductivity and ash mass fraction. Statistically significant difference (p≤0.05) was established only for average values of free acids concentration between honey samples originating from the localities Kanjiža and Čelarevo. All of the analyzed honey samples were found to meet national and European legislation for investigated parameters

RP-HPLC method development for simultaneous determination of the drugs Ramipril and Amlodipine

2012 ◽  
Vol 2 (2) ◽  
pp. 364-367 ◽  
Author(s):  
Saida Naik Dheeravath ◽  
◽  
Kasani Ramadevi ◽  
Zilla Saraswathi ◽  
Dheeravath Maniklal ◽  
...  
Keyword(s):  
Simultaneous Determination ◽  
Method Development ◽  
Hplc Method ◽  
Rp Hplc ◽  
Hplc Method Development
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