Quality Assessment of Raw Honey Issued from Eastern Romania

Romania is known among the main European honey producers, due to the variety of landforms as well as the diversity of the flora. Thirty-four honey samples of the acacia, linden and multifloral types, produced in eastern Romania and collected during 2013–2018, were physico-chemically analyzed using methods provided by the national and EU standards. The results of water-insoluble solids, color and refractive index were found to be 0.023–0.131%, 0.3–76.4 mm Pfund and 1.485–1.499, respectively. The moisture content ranged between 15.20% and 20.77%, solid substances content ranged between 79.23% and 84.80% and total soluble substances content ranged between 77.83 °Brix and 83.26 °Brix. The obtained values of specific gravity were from 1.414 to 1.450 g/cm3, pH ranged from 3.673 to 5.503 and free acidity ranged between 2.4 meq and 50 meq kg−1. The ash content and the electrical conductivity varied between 0.030 and 0.543% and 130 and 679 µS cm−1, respectively. Pearsonʹs correlation analysis showed an intense association of the ash content with electrical conductivity (r = 0.81). Our findings reveal the qualitative level of Romanian honey and the variation in quality parameters due to factors such as geographical region, climatic conditions, botanical origin and handling or storage conditions.

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From the Beehives: Identification and Comparison of Physicochemical Properties of Algerian Honey

Resources ◽

10.3390/resources10100094 ◽

2021 ◽

Vol 10 (10) ◽

pp. 94

Author(s):

Mokhtar Guerzou ◽

Hani Amir Aouissi ◽

Ahlem Guerzou ◽

Juris Burlakovs ◽

Salaheddine Doumandji ◽

...

Keyword(s):

Electrical Conductivity ◽

Physicochemical Properties ◽

Water Content ◽

Physicochemical Parameters ◽

Ash Content ◽

International Standards ◽

Free Acidity ◽

Codex Alimentarius ◽

Index Analysis ◽

Geographical Locations

In this study, the authors aimed at characterizing 11 Algerian kinds of honey taken from various geographical locations (beehives located at Djelfa (Medjbara and Dzaira), Laghouat, Aflou, Medea, Tiaret, Sidi bel-Abbes, Tiaret, Ain-Safra, Mostaganem, El Bayadh, and Ghardïa). The authors investigated the physicochemical parameters of these honey samples, including density, water content, electrical conductivity, ash content, pH, hydroxymethylfurfural (HMF) content, free acidity, and color. The physicochemical parameters obtained were found to be within acceptable ranges according to the international standards (Codex Alimentarius) for 9 out of 11 analyzed samples: density 1.38–1.50 g/cm3 (the same as kg/L, as commonly used for honey), water content 14.03–18.80%, electrical conductivity 0.38 × 10−1 − 6.41 × 10−1 mS/cm, ash content 0.06–0.48%, pH 3.50–4.50, free acidity 11–47 meq/kg, and color 1.1–9.2 Pfund index. Analysis of HMF content showed that only two honey samples have high values (117.7 and 90.0 meq/kg). Most samples of Algerian honey are of suitable quality according to international standards.

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The influence of frozen storage conditions on selected quality parameters of poultry and pork

AUTOBUSY – Technika Eksploatacja Systemy Transportowe ◽

10.24136/atest.2018.241 ◽

2018 ◽

Vol 19 (6) ◽

pp. 1137-1140

Author(s):

Krzysztof Tereszkiewicz ◽

Magdalena Pigoń ◽

Piotr Molenda ◽

Karolina Choroszy

Keyword(s):

Electrical Conductivity ◽

Water Absorption ◽

Water Content ◽

Ph Value ◽

Frozen Storage ◽

Storage Conditions ◽

Quality Parameters ◽

Chemical Parameters ◽

Physico Chemical

The paper presents results of studies concerning the influence of frozen storage conditions on selected quality parameters of poultry and pork. The following physico-chemical parameters were analysed: water content, pH value, lightness of colour, electrical conductivity and water absorption. It was observed that during the analysed period of frozen storage similar changes of the examined quality parameters occurred in both types of meat, yet with a different intensity. In poultry, higher losses of water were observed, as well as a significant increase in light-ness of colour and in the index of water absorption. In pork, changes in pH value and electrical conductivity were the most visible.

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The physicochemical, sensory evaluation and glycemic load of stingless bee honey and honeybee honey

Food Research ◽

10.26656/fr.2017.5(1).316 ◽

2020 ◽

Vol 5 (1) ◽

pp. 99-107

Author(s):

Raja Nurfatin R.M.Y. ◽

Norhayati M.K. ◽

Mohd Fairulnizal M.N. ◽

N. Hadi ◽

M. Abdul Manam ◽

...

Keyword(s):

Electrical Conductivity ◽

Sensory Evaluation ◽

Sugar Content ◽

Glycemic Load ◽

Ash Content ◽

Stingless Bee ◽

Oral Glucose ◽

Free Acidity ◽

Total Carbohydrate ◽

Glucose Response

Honey is a widely consumed functional food which has a valued place in traditional medicine. The purpose of this study was to compare the physicochemical properties, sensory evaluation, and glycemic load of honeybee honey and stingless bee honey. Physicochemical parameters include moisture, ash, pH, free acidity, electrical conductivity and sugar content which were determined by following the International Honey Commission methods. Ten subjects were selected for glycemic index study. For oral glucose tolerance test (OGTT), about 50 g of pure glucose in 250 mL of water was given to subject while 25 g of pure glucose in 250 ml water as a reference food. The blood glucose response was measured based on the incremental area under curve (IAUC) and compared to that of 25 g of available carbohydrate from glucose. Results indicated that the moisture content (29.5% vs 28.0%), free acidity (84.5 vs 73.5) and total carbohydrate (64.33 vs 50.35) of honeybee honey was significantly (all p<0.05) higher as compared to stingless bee honey, with no significant differences in ash content, pH and electrical conductivity between both honey (p>0.05). Their ash content is closely similar, which might be due to a similar geographical source, namely the Marang area. In terms of sensory evaluation, honeybee honey is more preferred, as the overall scores (5.5 vs 4.8) including colour (4.5 vs 3.5), odour (5.2 vs 4.0) and sweetness (6.0 vs 3.5) were significantly higher than stingless bee honey, even though the aftertaste (5.8 vs 4.8) is also higher. Furthermore, stingless bee honey has lower GI and GL (81.76, 5.27) as compared to honeybee honey (97.86, 6.96), respectively. It is suggested that the serving in term of odd or even numbers might affect the outcomes of the study as honeybee honey represents four spoons vs five spoons of stingless bee honey.

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Characterization of Kenyan Honeys Based on Their Physicochemical Properties, Botanical and Geographical Origin

International Journal of Food Science ◽

10.1155/2019/2932509 ◽

2019 ◽

Vol 2019 ◽

pp. 1-10 ◽

Cited By ~ 2

Author(s):

Mary Wanjiru Warui ◽

Lise Hansted ◽

Mary Gikungu ◽

John Mburu ◽

Geoffrey Kironchi ◽

...

Keyword(s):

Electrical Conductivity ◽

Physicochemical Properties ◽

Local Level ◽

International Standards ◽

The European Union ◽

Botanical Origin ◽

Free Acidity ◽

Pollen Types ◽

West Pokot ◽

Parameter Values

Properties and composition of honey are essential in providing information regarding their quality as well as in their differentiation based on production region characteristics, e.g., floral sources. This paper presents physicochemical properties and floral sources (botanical origin) of 21 honey samples obtained from arid and semiarid areas of Kenya, specifically, West Pokot, Baringo, and Kitui Counties. Physicochemical parameters which were analyzed to determine honey quality included moisture content, hydroxymethylfurfural (HMF), diastase activity, free acidity, and electrical conductivity. Values of these parameters were compared with those of the existing local, regional, and international standards for honey. Melissopalynological analysis (pollen analysis) was also carried out to provide information on botanical origin of the honeys. Results showed mean parameter values of moisture, 16.34%; HMF, 23.28 mg/kg; diastase activity, 10.67 Schade units; free acidity, 22.95 meq/kg; and electrical conductivity, 0.40 mS/cm. Free acidity and electrical conductivity values of honey samples obtained from West Pokot were significantly lower than the values of honeys from Baringo and Kitui. Eighteen (18) honey samples had all parameter values within the limits set in the East African, Codex Alimentarius, and the European Union directive standards for honey. Results also showed a total of 29 pollen types in the honey samples analyzed, and Acacia spp. was the predominant pollen type in 4 of the 21 honey samples. Findings of this study showed that Kenyan origin honeys can tap into the existing regional and international markets based on their quality which can be attributed to their botanical origin. Results of this study also suggested that honey producers have undertaken appropriate measures in honey harvesting, processing, handling, and storage. However, there is a need to build capacity of producers whose honey were of unacceptable quality. This would involve training on proper honey production, processing, and handling practices as well establishment of honey collection and processing centres at the local level in order to improve honey quality. This will enhance access to existing honey markets. Conservation of bee floral sources would also be needed to maintain honey quality.

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Physical and Rheological Properties of Poly-floral Honey from the Iraqi Kurdistan Region and the Effect of Temperature on its Viscosity

Current Nutrition & Food Science ◽

10.2174/1573401316999201001145306 ◽

2020 ◽

Vol 16 ◽

Author(s):

Auday Khudaier Azawy ◽

Kocher Jamal Ibrahim ◽

Omed Gh. Abdullah ◽

Beshroo Abdulkareem Othman ◽

Jasim M. S. Al-Saadi

Keyword(s):

Electrical Conductivity ◽

Surface Tension ◽

Heat Capacity ◽

Moisture Content ◽

Rheological Properties ◽

Ash Content ◽

Soluble Solids ◽

Effect Of Temperature ◽

Free Acidity ◽

Kurdistan Region

Aims: In this study, the physical and rheological properties of three poly-floral honey samples collected from different places in the Kurdistan region were determined. Methods: The honey samples were analyzed for pH, free acidity, total ash content, moisture content, refractive index, soluble solids (Brix), electrical conductivity, volume expansion, density, specific heat capacity, surface tension, and rheological properties. The pH and free acidity of the honey samples varied from 4.10 to 4.81 to 30 to 62 mEq/kg, respectively. The total ash content ranged from 0.166 to 0.408 %. The moisture content, soluble solids, and refractive index ranged from 15.60 to 16.60 g/100 g, 83.40 to 84.40, and 1.4998 to 1.5023, respectively. The electrical conductivity ranged from 40.896 to 44.471 mS/cm. The linear relationship between the electrical conductivity and the ash content was also calculated in this investigation. The volumetric expansion coefficient of the honey samples varied from 6.0098x10-4 to 6.69942x10-4 mm3 /K. The density ranged from 1.42125995 to 1.45501137 g/cm3 . The specific heat capacity of the varied from 2448.078 to 2575.004 J/kg.K. The surface tension varied from 0.2178 to 0.2282 N/m. The apparent viscosity was measured by Brookfield Viscometer, and the dynamic viscosity was measured by HAAKE Falling Ball Viscometer, after changing the temperature from 293 to 323 K. Results and Discussion: The honey samples of lower moisture content showed a greater increase in their apparent and dynamic viscosities. Arrhenius model was used to describe the effect of temperature on the honey viscosity. This model was used to determine the activation energy. Other rheological properties as kinematic viscosity and fluidity, were also determined. Conclusion: All the honey samples behaved as Newtonian fluids in the whole temperature range.

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Assessment of trace metals and physicochemical parameters of commercially available honey in Ethiopia

10.31221/osf.io/5vb6a ◽

2019 ◽

Author(s):

Chem Int

Keyword(s):

Electrical Conductivity ◽

Physicochemical Properties ◽

Toxic Metal ◽

Absorption Spectrometry ◽

Quality Parameters ◽

Ash Content ◽

International Standards ◽

Flame Atomic Absorption ◽

Metal Contents ◽

Mean Concentration

Trace metal contents and quality parameters (physicochemical properties) such as pH, electrical conductivity and ash content of four Ethiopian honeys were determined using flame atomic absorption spectrometry, pH-meter, conductivity meter and ashing, respectively. The optimized wet digestion method for honey analysis was found efficient for the metals determined and it was validated through the recovery experiment and a good percentage recovery was obtained (93-104%). Fe was found in highest amount with mean concentration ranging from 5.37 to 12.4 μg/g followed by Ni with mean concentration range of 0.80 to 4.46 μg/g, Cr (1.20-4.33 μg/g), Zn (1.92-4.22 μg/g), Co (0.60-1.17 μg/g), Mn (0.16-0.89 μg/g), Cd (ND-0.69 μg/g) and Cu (0.09-0.47 μg/g). The toxic metal Pb was not detected. The ranges of physicochemical properties determined were summarized as: pH 4.11-4.33, electrical conductivity of 0.10-0.29 mscm-1 and ash content 0.17-0.46%. The metals content and the physicochemical properties investigated in honey samples were found within the ranges established by national and international standards.

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Ekstrak Biji Mahoni (Swietenia Mahogany (L.)Jacq) Untuk Pembuatan Obat Anti Nyamuk Elektrik

Jurnal Katalisator ◽

10.22216/jk.v3i1.2305 ◽

2018 ◽

Vol 3 (1) ◽

pp. 7

Author(s):

Yuska Novi Yanti ◽

Hepiyansori Hepiyansori

Keyword(s):

Bitter Taste ◽

Quality Parameters ◽

Ash Content ◽

Tropical Region ◽

Mosquito Repellent ◽

Standard Quality ◽

Traditional Crops

Indonesia daerah tropis yang baik untuk perkembangan jenis nyamuk sehingga membahayakan kesehatan. Indonesia kaya tanaman tradisional untuk pengobatan. Salah Satunya Mahoni (Swietenia mahogany (L.)Jacq) pada bagian biji yang digunakan masyarakat untuk pengobatan malaria, diabetes, dan darah tinggi. Kandungan pada biji Mahoni yaitu saponin dan flavanoid dapat digunakan sebagai sediaan obat anti nyamuk. Sampel penelitian ini adalah biji mahoni yang diambil dari Taman Remaja Kota Bengkulu lalu di maserasi menggunakan pelarut metanol p.a dan etanol 96% selanjutnya ekstrak dibuat menjadi 3 konsentrasi ekstrak yaitu 1%, 3% dan 5%. Kemudian dibuat keping anti nyamuk dan di buat obat anti nyamuknya, dilanjutkan dengan pengujian evalusi ekstrak meliputi uji organoleptis, uji kadar abu dan uji rendemen kemudian pengujian evalusi sediaan yang meliputi uji organoleptis, uji keping anti nyamuk dan uji ketahanan sediaan. Hasil penelitian didapatkan, ekstrak metanol biji mahoni dapat mempengaruhi sifat fisik sediaan keping nyamuk, Ekstrak biji mahoni berwarna coklat sampai kemerahan, memiliki bau khas (aroma kacang tanah), konsistensi cukup padat sedikit berminyak dan berasa pahit. Uji parameter standar menghasilkan data untuk rendemen sebesar 0,8235% untuk metanol dan 0,6747% untuk etanol, kadar abu untuk metanol 1,249% dan untuk etanol 1,022%. sehingga ekstrak metanol biji mahoni dapat dibuat menjadi sediaan keping anti nyamuk.Indonesia tropical region places the development some mosquitoes that endanger health. Indonesia traditional crops can used for treatment. Mahoni (Swietenia mahogany (L.)Jacq) a plant which usually treatment. Especially part of the seed malaria drugs, diabetes and high blood pseasure.That in the seeds of mahoni there is saponin and flavonid can be used as a mosquito repellent. The sample this research is seeds mahoni taken from the Remaja Bengkulu Pares. Processed maserasi with methanol solvent p.a and ethanol 96% next methanol made to 3 concentration an extract that 1%, 3% and 5%. Created pieces of mosquito repellent and mosquito repellent that followed terts the evaluation of extract. covers organoleptis, ash content and rendemen and testing performed and evaluation dosage, includes organoleptis, pieces mosquito repellent and dosage resutance.Result experiment is extract methanol seeds mahoni 82,35 gram and extract ethanol seeds mahoni 67,47 gram. Extract colored from dark brown to reddish, have peanut like aroma, adequate compact consistency, bitter taste and not sticky in hand. The result of standard quality parameters rendemen extract methanol 0,8235% and rendemen extract ethanol 0,6747%, ash content extract methanol 1,247% and ash content extract ethanol 1,022%. so that the extract of methanol mahogany seeds can made into anti-mosquito

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Effect of Storage Conditions on Storability and Antioxidant Potential of Pears cv. ‘Conference’

Agriculture ◽

10.3390/agriculture11060545 ◽

2021 ◽

Vol 11 (6) ◽

pp. 545

Author(s):

Grzegorz P. Łysiak ◽

Krzysztof Rutkowski ◽

Dorota Walkowiak-Tomczak

Keyword(s):

Mass Loss ◽

Strong Influence ◽

Storage Conditions ◽

Quality Parameters ◽

Soluble Solids ◽

Controlled Atmosphere ◽

Postharvest Diseases ◽

Market Prices ◽

Long Period ◽

The Impact

Late pear cultivars, such as ‘Conference’, can be stored for a long period if kept in good storage conditions. A three-year study (2011–2013) compared the impact of six-month storage using four technologies—normal atmosphere, normal atmosphere + 1-methylcyclopropene (1-MCP), controlled atmosphere, and controlled atmosphere + 1-MCP—on the quality parameters of ‘Conference’ pears, such as mass loss, firmness, total soluble solids, acidity, antioxidant capacity, and the incidence of diseases and disorders. Additionally, the study analysed different storage conditions in terms of profitability, based on the market prices for pears in the seasons during which the pears were stored. The storage conditions had a very strong influence on the fruit quality parameters, and were found to affect most visibly the mass loss and the incidence of postharvest diseases and disorders. The storage of ‘Conference’ pears for 180 days in normal atmosphere is not economically viable, even if the fruit is subjected to 1-MCP treatment; at the same time, it is profitable to store ‘Conference’ pears in controlled atmosphere for the same period, no matter whether 1-MCP was applied or not.

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Comparison of Quality Changes in Eurasian Perch (Perca Fluviatilis L.) Fillets Originated from Two Different Rearing Systems during Frozen and Refrigerated Storage

Foods ◽

10.3390/foods10061405 ◽

2021 ◽

Vol 10 (6) ◽

pp. 1405

Author(s):

Nima Hematyar ◽

Jan Mraz ◽

Vlastimil Stejskal ◽

Sabine Sampels ◽

Zuzana Linhartová ◽

...

Keyword(s):

Protein Oxidation ◽

Sodium Dodecyl ◽

Frozen Storage ◽

Storage Conditions ◽

Quality Parameters ◽

Protein Carbonyls ◽

Main Concern ◽

Refrigerated Storage ◽

Eurasian Perch ◽

Recirculating Aquaculture Systems

The current knowledge on how different Eurasian perch rearing systems impact the final fillet quality is scant. Therefore, two domestic storage conditions were investigated—10 months frozen (-20 °C) and 12 days refrigerated (+4 °C) storage conditions—in order to determine (i) how the choice of rearing system affects fillets quality during different processing conditions and (ii) if oxidative changes and other quality parameters were interactive. For the proposed idea, proteome analysis, oxidative changes, and some quality parameters were considered in this study. Sodium dodecyl-sulfate polyacrylamide gel electrophoresis (SDS-PAGE) indicated a higher loss of protein in the frozen fillets from ponds (PF) than the fillets from recirculating aquaculture systems (RAS) (RF). Western blot showed a higher protein carbonyls level in RF compared to PF, which was confirmed by the total protein carbonyls during frozen storage. PF indicated less liquid loss, hardness, and oxidation progress than RF in both storage conditions. The biogenic amines index (BAI) in the fillets from either origin showed acceptable levels during storage at +4 °C. Furthermore, the n-3/n-6 ratio was similar for both fillets. The deterioration of fillets during frozen storage was mainly caused by formation of ice crystals followed by protein oxidation, while protein oxidation was the main concern during refrigerated storage confirmed by principal component analysis (PCA) analysis.

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