Off-Flavor Compounds in Wine and Other Food Products Formed By Enzymatical, Physical, and Chemical Degradation of Tryptophan and its Metabolites

1999 ◽  
pp. 659-669 ◽  
Author(s):  
N. Christoph ◽  
M. Geßner ◽  
T. J. Simat ◽  
K. Hoenicke
Keyword(s):  
Food Products ◽  
Chemical Degradation ◽  
Flavor Compounds ◽  
Physical And Chemical

scholarly journals Control of physical and chemical qualities of milk and dairy food products obtained in an ecologically unfavorable zone

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Y.A. Yuldashbaev ◽  
R.B. Temiraev ◽  
V.V. Tedtova ◽  
K.B. Temiraev ◽  
R.V. Osikina ◽  
...  
Keyword(s):  
Food Products ◽  
Dairy Food ◽  
Physical And Chemical

scholarly journals Enzymes Involved in Plastic Degradation

2021 ◽  
pp. 95-110
Author(s):  
S.Z.Z. Cobongela
Keyword(s):  
Polyethylene Terephthalate ◽  
Synthetic Polymers ◽  
Chemical Degradation ◽  
Natural Resistance ◽  
Aquatic Life ◽  
Carbon Backbone ◽  
Catabolic Enzymes ◽  
Plastic Degradation ◽  
Global Increase ◽  
Physical And Chemical

The global increase in production of plastic and accumulation in the environment is becoming a major concern especially to the aquatic life. This is due to the natural resistance of plastic to both physical and chemical degradation. Lack of biodegradability of plastic polymers is linked to, amongst other factors, the mobility of the polymers in the crystalline part of the polyesters as they are responsible for enzyme interaction. There are significantly few catabolic enzymes that are active in breaking down polyesters which are the constituents of plastic. The synthetic polymers widely used in petroleum-based plastics include polyethylene (PE), polypropylene (PP), polyvinylchloride (PVC), polyurethane (PUR), polystyrene (PS), polyamide (PA) and polyethylene terephthalate (PET) being the ones used mostly. Polymers with heteroatomic backbone such as PET and PUR are easier to degrade than the straight carbon-carbon backbone polymers such as PE, PP, PS and PVC.

scholarly journals Studying Non-Traditional Plants Oils For Food Purpose

2020 ◽  
Vol 02 (12) ◽  
pp. 59-63
Author(s):  
Akramova Rano Ramizitdinovna ◽  
◽  
Sayfutdinov Djamolitdin Ramizitdinovich ◽  
Keyword(s):  
Vegetable Oils ◽  
Food Products ◽  
Innovative Technology ◽  
Chemical Characteristics ◽  
Oil Seeds ◽  
Economic Mechanism ◽  
Physical And Chemical Characteristics ◽  
Food Market ◽  
Traditional Vegetable ◽  
Physical And Chemical

The article discusses the possibility of expanding the range of strategically important consumer food products such as vegetable oil.The necessity of developing an innovative technology for obtaining non-traditional vegetable oils, which will improve the economic mechanism for the development of the food market, has been substantiated. The physical and chemical characteristics of oil seeds grown in Uzbekistan have been studied. It has been proven that the oils obtained from non-traditional oilseeds can be used for consumption, and will play an important role in expanding the range of non-traditional vegetable oils.

Applications of Nanoemulsions in Food Manufacturing

2022 ◽  
pp. 448-465
Author(s):  
Tahir Mehmood ◽  
Muhammad Kaleem ◽  
Zulfiqar Ahmad ◽  
Muhammad Waseem ◽  
Baila Ahmad ◽  
...  
Keyword(s):  
Antimicrobial Agents ◽  
Control Release ◽  
Food Products ◽  
Chemical Degradation ◽  
Lipophilic Compounds ◽  
Food Industries ◽  
Fortified Food ◽  
Main Challenge ◽  
Texture Modification ◽  
Modified Starches

Nanoemulsions are increasingly used in the food industry for the encapsulation of lipophilic compounds such as nutraceuticals, flavors, vitamins, antioxidants, and colors. The advantages of nanoemulsion-based encapsulation include increased bioavailability, higher solubility, control release, protection from chemical degradation, and incorporation of different ingredients into food products. Food industries are interested in the preparation of natural polymer-based nanoemulsions to prepare clean label products. A variety of polymers such as soya lecithin, WPI, GA, and modified starches have been used to fabricate nanoemulsion-based delivery systems for nutraceuticals and micronutrients. Hence, nanoemulsion-fortified food products have received great attention due to consumer demand for safer and healthier food products. Additionally, nanoemulsions can be used for the texture modification of food products and encapsulation as well as delivery of antimicrobial agents. The main challenge for the preparation of nanoemulsions is the selection of appropriate ingredients.

Preparation and Characterization of Vitamin a Palmitate-Loaded Nanostructured Lipid Carriers as Delivery Systems for Food Products

2011 ◽  
Vol 236-238 ◽  
pp. 1818-1823 ◽  
Author(s):  
Rong Kong ◽  
Qiang Xia ◽  
Guang Yu Liu
Keyword(s):  
Vitamin A ◽  
Spherical Shape ◽  
Entrapment Efficiency ◽  
Food Products ◽  
Storage Conditions ◽  
Correlation Spectroscopy ◽  
Nanostructured Lipid Carriers ◽  
Laser Diffractometry ◽  
Physical And Chemical

Vitamin A Palmitate-loaded Nanostructured Lipid Carriers were prepared by High Pressure Homogenization (HPH) technique. The influences of storage conditions such as time and temperature on the physical and chemical storage stability of VAP-NLCs were studied in details. Preparation and physicochemical properties of VAP lipid nanoparticles were investigated using various analytical equipments such as TEM, photon correlation spectroscopy (PCS), laser diffractometry (LD) and ultraviolet spectrophotometer. The respective optimal HPH pressure and cycles were 70MPa and 5 cycles, so VAP-NLC dispersions under the optimized condition gave rise to the entrapment efficiency (EE) of 99.8%, PI of 0.234, mean diameter of 144±1.7 nm (2% VAP loading capacity). In addition, VAP lipid nanoparticle has a distinct spherical shape, its particle sizes were around 60–330 nm according to VAP contents and zeta potential values -18~-23 mV. Furthermore, the pH of VAP-NLC dispersion was near to 7.0. This study showed that VAP-NLC could hopefully be applied for food products.

scholarly journals Leaf wax <i>n</i>-alkanes in modern plants and topsoils from eastern Georgia (Caucasus) – implications for reconstructing regional paleovegetation

2017 ◽  
Author(s):  
Marcel Bliedtner ◽  
Imke K. Schäfer ◽  
Roland Zech ◽  
Hans von Suchodoletz
Keyword(s):  
Regional Scale ◽  
Chemical Degradation ◽  
Vegetation Types ◽  
Terrestrial Plants ◽  
Caucasus Region ◽  
Leaf Wax ◽  
South Eastern Europe ◽  
Southern Caucasus ◽  
Physical And Chemical ◽  
Long Chain

Abstract. Long-chain n-alkanes became increasingly used for paleoenvironmental studies during the last years as they have the great potential to reconstruct past changes in vegetation and climate. They mostly originate from leaf waxes of higher terrestrial plants, are relatively resistant against physical and chemical degradation and can thus serve as valuable biomarkers that are preserved in various sedimentary archives for at least millennial timescales. However, before any robust interpretation of the long-chain n-alkane patterns in sedimentary archives, reference samples from modern vegetation and topsoil material should be investigated at a regional scale. Apart from Central and South-Eastern Europe, such systematic regional studies on modern plant and topsoil material are still largely lacking. To test the potential of leaf wax derived n-alkane patterns for paleoenvironmental studies in the semi-humid to semi-arid southern Caucasus region, we investigated the influence of different vegetation types on the leaf wax n-alkane signal in modern plants and topsoil material (0–5 cm) from eastern Georgia. We sampled (i) sites with grassland that included steppe, cultivated grassland and meadows, and (ii) sites that are dominated by deciduous hornbeam forests. The n-alkane results show distinct and systematic differences between samples from sites with the different vegetation types: n-alkanes derived from sites with grassland are mainly dominated by C31, while n-alkanes derived from sites with deciduous trees show high abundances of C29. Thus, chain-length ratios allow to discriminate between these two different vegetation types and have a great potential when used for regional paleoenvironmental reconstructions. As degradation of organic matter can affect the leaf wax n-alkane distribution, we further present an updated end-member model that includes our results, accounts for degradation effects and enables semi-quantitative reconstruc-tions of past vegetation changes in the southern Caucasus region.

scholarly journals Fire - mechanical behaviour of sandwich composite beam

2020 ◽  
pp. 22-26
Author(s):  
Tran Van Luan, Le Minh Tien Tran
Keyword(s):  
Mechanical Behaviour ◽  
Sandwich Beam ◽  
Extreme Temperature ◽  
Chemical Degradation ◽  
Sandwich Composite ◽  
Composite Sandwich ◽  
Materials Used ◽  
Marine Applications ◽  
Sandwich Materials ◽  
Physical And Chemical

We have analyzed the fire-mechanical behaviour of sandwich composite materials used in marine applications, as a function of the combustion time. In this light, sandwich beam samples are analyzed in terms of fire resistance kinetic and of post-combustion mechanical strength. We have shown that the materials undergo a strong degradation during 100 s of fire exposure at 750 ° C and this degradation is linked to the top skin. Finally, a finite element modelling work is being developed to predict the thermal behavior of composite sandwich materials; this modelling must include all thermal, physical and chemical degradation processes in order to realistically report resistance of materials in extreme temperature environment.

scholarly journals Fractal Metrology for biogeosystems analysis

2010 ◽  
Vol 7 (11) ◽  
pp. 3799-3815 ◽  
Author(s):  
V. Torres-Argüelles ◽  
K. Oleschko ◽  
A. M. Tarquis ◽  
G. Korvin ◽  
C. Gaona ◽  
...  
Keyword(s):  
Measurement Techniques ◽  
Clay Mineralogy ◽  
Chemical Degradation ◽  
Structural Pattern ◽  
Box Counting ◽  
Soil Functioning ◽  
Gray Intensity ◽  
Physical And Chemical ◽  
Contrasting Structure

Abstract. The solid-pore distribution pattern plays an important role in soil functioning being related with the main physical, chemical and biological multiscale and multitemporal processes of this complex system. In the present research, we studied the aggregation process as self-organizing and operating near a critical point. The structural pattern is extracted from the digital images of three soils (Chernozem, Solonetz and "Chocolate" Clay) and compared in terms of roughness of the gray-intensity distribution quantified by several measurement techniques. Special attention was paid to the uncertainty of each of them measured in terms of standard deviation. Some of the applied methods are known as classical in the fractal context (box-counting, rescaling-range and wavelets analyses, etc.) while the others have been recently developed by our Group. The combination of these techniques, coming from Fractal Geometry, Metrology, Informatics, Probability Theory and Statistics is termed in this paper Fractal Metrology (FM). We show the usefulness of FM for complex systems analysis through a case study of the soil's physical and chemical degradation applying the selected toolbox to describe and compare the structural attributes of three porous media with contrasting structure but similar clay mineralogy dominated by montmorillonites.

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