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Ioan David

19 linked publication records · Univesity of Life Science "King Mihai I" from Timisoara

Author: Ioan Davidclear all
Showing 1-19 of 19 records
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SWS 2026 Conference Preprints
Publication

ANTIBACTERIAL ACTIVITY EVALUATION OF SOME CONIFER BUD SYRUPS

(STEF92 Technology, 2026, Gabriel Stelian Bujanca, Corina Iuliana Megyesi, Ioan David, Laura Radulescu, Aurica Borozan)

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The present study aims to evaluate the antibacterial potential of syrups derived from the buds of indigenous Romanian conifers, specifically silver fir (Abies alba) and Scots pine (Pinus sylvestris). The research is motivated by the increasing clinical interest in natural bioactive compounds as viable alternatives or adjuncts to synthetic pharmaceutical agents. By utilizing traditional extraction methods on raw materials harvested from natural forest ecosystems, this work seeks to characterize the therapeutic and ...

Advances in Biotechnology2026
SWS 2026 Conference Preprints
Publication

LIPOXYGENASE, AN ENZYMATIC BIOCATALYST USED FOR SUSTAINABLE FOOD PRODUCTION

(STEF92 Technology, 2026, Ioan David, Calin Jianu, Nicoleta Hadaruga, Ariana Velciov, Gabriel Bujanca)

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This investigation evaluates the biocatalytic efficacy of oxidases, more specifically lipoxygenase, on the physicochemical and rheological dynamics of wheat flour matrices. A systematic review of current literature highlights the multifaceted functional advantages of lipoxygenase incorporation across diverse wheat cultivars. Empirically, lipoxygenase significantly modulates dough rheology, concurrently enhancing extensibility, viscoelasticity, deformation resistance, and hydration capacity. Furthermore, we elucida...

Advances in Biotechnology2026
25th International Multidisciplinary Scientific GeoConference Proceedings SGEM 2025, Nano, Bio, Green and Space: Technologies for Sustainable Future, Vol 25, Issue 6.2
Publication

ASSESSMENT OF THE ANTIOXIDANT PROPERTIES OF DRIED APPLE PEEL (Malus domestica L.)

(STEF92 Technology, 2025-12-27, Ariana-Bianca Velciov, Maria Rada, Radulescu Laura, Corina-Iuliana Megyesi, Ioan David David)

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Apple peels represent a significant source of bioactive compounds with potential health-promoting effects, including polyphenols, flavonoids, dietary fibers, vitamins, and essential minerals. Due to their high content of polyphenols and flavonoids, apple peels exhibit remarkable antioxidant activity, contributing to the development of functional foods and to the reduction of chronic disease risks such as cardiovascular diseases, cancer, and diabetes. The aim of this study was to evaluate the functional properties ...

Advances in Biotechnology2025
25th International Multidisciplinary Scientific GeoConference Proceedings SGEM 2025, Nano, Bio, Green, and Space Technologies for a Sustainable Future, Vol25, Issue 6.1
Publication

THE INFLUENCE OF ENZYMATIC BIOCATALYSTS IN THE TECHNOLOGY OF WAFER PRODUCTIONS

(STEF92 Technology, 2025-08-15, Ioan David, Călin Jianu, Nicoleta G. Hădărugă, Ariana Bianca Velciov, G. Bujancă)

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This article shows how enzymatic biocatalysts, specifically hemicellulase and asparaginase, affect the rheological properties of white flour dough used for wafers. The study utilized alveo-consistographic and falling number methods to analyze dough behavior and the impact of different dosages of enzymes on flour and finished wafer products. Adding these enzymes in wafer production increases health and efficiency by enhancing dough handling, volume, and wafer texture, demonstrating their potential for sustainable f...

Advances in Biotechnology2025
25th International Multidisciplinary Scientific GeoConference Proceedings SGEM 2025, Nano, Bio, Green, and Space Technologies for a Sustainable Future, Vol25, Issue 6.1
Publication

THE INFLUENCE OF RAW MATERIALS ON THE QUALITY OF RAW DRIED MEAT PRODUCTS. CARPA?I SALAMI

(STEF92 Technology, 2025-08-15, G. Bujancă, Corina Iuliana Megyesi, Ioan David, A. Rinovetz, D. S. Ștef)

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The aim of the study was to monitor two types of Carpathian salami (one with a fat content of 20% and the other with 30% content). Variations in humidity, pH, fat and NaCl content were monitored, as well as changes that occurred during storage. The monitoring interval of the influence of raw and auxiliary materials on the obtained salami and the physicochemical and organoleptic changes occurred during storage was 1 - 115 days. In the case of the two types of salami, it was observed that the variation of fat conten...

Advances in Biotechnology2025
SGEM International Multidisciplinary Scientific GeoConference- EXPO Proceedings; 23rd SGEM International Multidisciplinary Scientific GeoConference Proceedings 2023, Nano, Bio, Green and Space: Technologies for a Sustainable Future, Vol. 23, Issue 6.2
Publication

THE USE OF BIOENZYMATIC INDICATORS LIKE PROTEASE AND ASPARAGINASE ENZYMES ON BISCUIT PRODUCTS

(STEF92 Technology, 2023-12-15, Ioan David, Ariana Bianca Velciov, G. Bujancă)

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This article presents the rheological study of protease and asparaginase enzymes on dough obtained from white flour used for biscuits. Using alveographic method and falling number method we were able to determine the rheological characteristics of the dough used for biscuits and monitor the effects in the flour and finished products of protease and asparaginase enzymes taking into account different dosages. The technological process of preparing biscuits and crackers using protease and asparaginase becomes more he...

Advances in Biotechnology2023
SGEM International Multidisciplinary Scientific GeoConference- EXPO Proceedings; 22nd SGEM International Multidisciplinary Scientific GeoConference Proceedings 2022, Nano, Bio, Green and Space - Technologies For a Sustainable Future, VOL 22, ISSUE 6.2
Publication

THE BIOCATALYTIC INFLUENCE OF ALFA-AMYLASE AND BETA-AMYLASE ENZYMES ON WHITE FLOUR USED IN BAKERY INDUSTRY

(STEF92 Technology, 2022-12-27, Ioan David)

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This article presents the biocatalytic influence of alfa-amylase and beta-amylase enzymes on the rheological parameters of the dough obtained from white flour used in bakery industry. Using alveographic and consistographic methods we were able to determine the rheological characteristics of the dough and make a comparison between alfa-amylase and beta-amylase taking into account different dosages and monitoring the effects in the flour and finished product. Amylase hydrolyzes starch to soluble dextrins and can aff...

Advances in Biotechnology2022
SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 19th International Multidisciplinary Scientific GeoConference SGEM2019, Nano, Bio, Green and Space: Technologies for Sustainable Future
Publication

THE INFLUENCE OF PENTOSANASES ENZYMES ON RYE FLOUR

(STEF92 Technology, 2019-06-20, Ioan David)

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This article presents the influence of pentosanases enzymes on the rheological parameters of the dough obtained from rye flour. The rheological characteristics of the rye dough were determined using the alveographic and consistographic methods. The functional properties of the main constituents of rye - starch, proteins and pentosans influence the baking characteristics rye flour. Rye does not contain as much gluten as wheat, and the quality of rye gluten is poor when it comes to retaining gases. This means breads...

Advances in Biotechnology2019
SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 18th International Multidisciplinary Scientific GeoConference SGEM2018, Energy and Clean Technologies
Publication

REPLACEMENT POSSIBILITIES OF THE HEAVY OVERLOAD PISTON OF GRAVITY HYDRO-POWER-TOWER ENERGY STORAGE PLANTS USING COMPRESSED AIR

(STEF92 Technology, 2018-06-20, Ioan David)

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In the era of the increasingly implementation of renewable energy sources in the electrical energy supply, the expansion of a sustainable energy industry must be promoted the resulting increase in storage requirements. The Gravity Hydro Power Tower Energy Storage (GHPTES) is an innovative hydraulic energy storage system based on pumped storage technology. It consists of a vertical cylindrical cavity, filled with water, in which moves an overload piston from steel at smaller storage systems or from rock at large st...

Ecology and Environmental Protection2018
SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 18th International Multidisciplinary Scientific GeoConference SGEM2018, Nano, Bio and Green - Technologies for a Sustainable Future
Publication

THE INFLUENCE OF BETA-AMYLASE ON DIFFERENT TYPES OF FLOUR

(STEF92 Technology, 2018-06-20, Ioan David)

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This article presents the influence of beta-amilase on 3 types of flour: white, whole and brown flour used in the baking industry. In order to determine the activity of the enzyme, the following analysis were done: the falling number using Perten Instruments FN 1310 and the rheological parameters of the dough using the alveographic method. The falling index indirectly measures the activity of enzymes, rapidly jellifying the aqueous suspension of flour which is introduced in a boiling water bath and it measures the...

Advances in Biotechnology2018
SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 18th International Multidisciplinary Scientific GeoConference SGEM2018, Nano, Bio and Green - Technologies for a Sustainable Future
Publication

THE INFLUENCE OF BETA-AMYLASE ON DIFFERENT TYPES OF FLOUR

(STEF92 Technology, 2018-06-20, Ioan David)

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This article presents the influence of beta-amilase on 3 types of flour: white, whole and brown flour used in the baking industry. In order to determine the activity of the enzyme, the following analysis were done: the falling number using Perten Instruments FN 1310 and the rheological parameters of the dough using the alveographic method. The falling index indirectly measures the activity of enzymes, rapidly jellifying the aqueous suspension of flour which is introduced in a boiling water bath and it measures the...

Advances in Biotechnology2018
SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 18th SGEM International Multidisciplinary Scientific GeoConference SGEM2018, Nano, Bio, Green and Space: Technologies for Sustainable Future
Publication

THE INFLUENCE OF LIPASE AND CARBOXYLESTERASE ENZYMES ON THE RHEOLOGICAL CHARACTERISTICS OF WHEAT FLOUR

(STEF92 Technology, 2018-11-20, Ioan David)

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This article presents the a comparison study between two enzymes: lipase and carboxylesterase, considering the influence on the rheological parameters of the dough obtained from wheat flour. For determining the activity of the enzymes, there were performed the following analysis: the determination of the fat content using Soxhlet method and the determination of rheological parameters of the dough using the alveographic method. The Soxhlet method is based on repeated extraction with ethyl ether or petroleum ether o...

Advances in Biotechnology2018
SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 18th SGEM International Multidisciplinary Scientific GeoConference SGEM2018, Nano, Bio, Green and Space: Technologies for Sustainable Future
Publication

THE INFLUENCE OF LIPASE AND CARBOXYLESTERASE ENZYMES ON THE RHEOLOGICAL CHARACTERISTICS OF WHEAT FLOUR

(STEF92 Technology, 2018-11-20, Ioan David)

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This article presents the a comparison study between two enzymes: lipase and carboxylesterase, considering the influence on the rheological parameters of the dough obtained from wheat flour. For determining the activity of the enzymes, there were performed the following analysis: the determination of the fat content using Soxhlet method and the determination of rheological parameters of the dough using the alveographic method. The Soxhlet method is based on repeated extraction with ethyl ether or petroleum ether o...

Advances in Biotechnology2018
SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 17th International Multidisciplinary Scientific GeoConference SGEM2017, Nano, Bio and Green - Technologies for a Sustainable Future
Publication

STUDY OPPORTUNITIES ON DRY FRACTIONATION METHOD BY WINTERIZATION FOR COMERCIALIZED NON HYDROGENATE PALM OIL. CHARACTERIZATION OF SOME QUALITY INDICATORS

(STEF92 Technology, 2017-06-20, Alexandru-Erne Rinovetz, Bogdan Radoi, Gabriel Bujanca, Corina Dana Misca, Ioan David)

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Developing products modified structurally and functionally that ensure health benefits is relatively recent and is the result of accepting the idea that food plays an important role in the prevention and therapy of some health conditions; these arguments are at the basis of the appearance of пїЅfunctional foodsпїЅ with пїЅhealth benefitsпїЅ. Modification techniques of non hydrogenated palm oil lipids (simple mixing, hydrogenation, interesterification, fractionation) are no novelty since they are being optimised th...

Advances in Biotechnology2017
SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 17th International Multidisciplinary Scientific GeoConference SGEM2017, Nano, Bio and Green - Technologies for a Sustainable Future
Publication

THE CONSISTOGRAPHIC DETERMINATION OF ENZYME ACTIVITY OF CARBOXYL ESTERASE ON PASTA PRODUCTS

(STEF92 Technology, 2017-06-20, Ioan David, Ariana Velciov, Lect. Alexandru Rinovetz, Lect. Gabriel Bujanca, Corina Misca)

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This study presents an analysis over the action of carboxyl esterase, enzyme used on dough for pasta and noodles. By using carboxyl esterase polar lipids are formed, acting as emulsifiers and interacting with the gluten as well free unsaturated fatty acids are released, which can be converted by lipoxygenase (contained in flour naturally) resulting in the formation of hydroperoxides, which can act as oxidants and lead to protein strengthening and bleaching (oxidation of pigments). Enyzmatic improvement of pasta an...

Advances in Biotechnology2017
Showing 1-19 of 19 records
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