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scientific work thermal degradation antioxidant

Scientific work Thermal degradation, antioxidant and ... Scientific work Thermal degradation, antioxidant and antimicrobial activity of the synthesized allicin and allicin incorporated in gel Authors DUŠICA P. ILIĆ, VESNA D. NIKOLIĆ, LJU

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Scientific work Thermal degradation, antioxidant and ...

Scientific work Thermal degradation, antioxidant and antimicrobial activity of the synthesized allicin and allicin incorporated in gel Authors DUŠICA P. ILIĆ, VESNA D. NIKOLIĆ, LJUBIŠA B. NIKOLIĆ, MIHAJLO Z. STANKOVIĆ and LJILJANA P. STANOJEVIĆ Faculty of Technology, Bulevar oslobođenja 124, 16000 Leskovac, Serbia

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The antioxidant effect in controlling thermal degradation ...

The sample with Irganox 1010 shows a further viscosity increase probably due to free radical recombination following chain-scission. We can conclude that primary antioxidant leads to a shift of thermal-oxidative degradation, in terms of LCB formation/crosslinking, towards shorter times.

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Phytochemicals and antioxidant activity degradation ...

Therefore, the objectives of this study was to investigate the kinetics of thermal degradation of the total phenolic content (TPC), total anthocyanin content (TAC), total flavonoid content (TFC), and antioxidant activity in sour cherries extract in the temperature range of 100 °C–160° for present heating time (0–120 min).

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Influence of antioxidant on the thermal–oxidative ...

1. Introduction. Thermal–oxidative degradation has been a persistent problem for lubricants, in particular for those synthetic esters mainly applied in industrial and engine oil, due to their high-temperature working conditions , , , .Many harmful oxidation products are formed during this process, and they always bring a lot of unfavorable influences to the lubricant system , .

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DUŠICA P. ILIĆ THERMAL DEGRADATION, ANTIOXIDANT VESNA D ...

scientific work udc 547.368–386:543.544.5:615.282 doi: 10.2298/hemind091111003i thermal degradation, antioxidant and antimicrobial activity of the synthesized allicin and allicin incorporated in gel

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[PDF] Thermal degradation, antioxidant and antimicrobial ...

The thermal degradation of allicin by using FTIR method was monitored. The method for the production of allicin gel based on Carbopol 940 (poly(acrylic acid)) was elaborated. The antimicrobial activity of pure allicin and allicin incorporated into gel by using a disk diffusion method was determined.

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(PDF) Thermal degradation, antioxidant and antimicrobial ...

PDF | The main carriers of the pharmacological activity of garlic (Allium sativum L.) are organic sulfur compounds, the most important among them being... | Find, read and cite all the research ...

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Thermal degradation of polyethylene containing antioxidant ...

Immobilized BHT is inactive and it suppresses the stabilizing effect of hydrophobic silica surface in the processes of thermal oxidation at the initial stage. However, being gradually released from the surface antioxidant prolongs the resistance of the polymer against oxidation.

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Identification of degradation products of antioxidants in ...

In addition to the analysis of degradation products of antioxidants in polymer samples, the thermal stability of pure antioxidants was studied. The antioxidants were kept at 115 °C for 24 h, dissolved in acetonitrile and injected into the HPLC-MS (ion trap) system, whereby ESI as well as APPI and APCI were used for ionisation. ADK Stab ...

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Effect of Types of Antioxidants on Thermal and Thermo ...

Thermal and thermo-oxidative degradation of epoxidized natural rubber containing 25 mol % expoxidation (ENR25) with different four antioxidants were investigated by thermogravimetric analysis (TGA). The four antioxidants, viz., poly-2,2,4-trimethyl-1,2-dihydroqui- noline (RD), N-(1,3-dimethylbutyl)-N'-phenyl-p-phenylenedianine (4020), N-isopropyl-N'-phenyl- p-phenylenedi-amine (4010NA), and 2 ...

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Phytochemicals and antioxidant activity degradation ...

Therefore, the objectives of this study was to investigate the kinetics of thermal degradation of the total phenolic content (TPC), total anthocyanin content (TAC), total flavonoid content (TFC), and antioxidant activity in sour cherries extract in the temperature range of 100 °C–160° for present heating time (0–120 min).

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The antioxidant effect in controlling thermal degradation ...

Abstract It is well known that antioxidants are widely used to prevent thermal degradation of high density and linear low density polyethylene. Antioxidants are not always present in low density polyethylene and only small amounts are usually added to these resins. In this work the effect of an antioxidant system on a low density resin having MFI (190 °C/2.16 kg)=2 g/10′ and density 0.9230 ...

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[PDF] Thermal degradation, antioxidant and antimicrobial ...

The thermal degradation of allicin by using FTIR method was monitored. The method for the production of allicin gel based on Carbopol 940 (poly(acrylic acid)) was elaborated. The antimicrobial activity of pure allicin and allicin incorporated into gel by using a disk diffusion method was determined.

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(PDF) Thermal degradation, antioxidant and antimicrobial ...

PDF | The main carriers of the pharmacological activity of garlic (Allium sativum L.) are organic sulfur compounds, the most important among them being... | Find, read and cite all the research ...

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Antioxidants | Free Full-Text | Impact of Thermal ...

Cyanidin-3-O-glucoside (C3G), the predominant anthocyanin in haskap berries (Lonicera caerulea L.), possesses antioxidant and many other biological activities. This study investigated the impact of temperature and pH on the degradation of the C3G-rich haskap fraction. The effect of the thermal degradation products on the viability of hepatocellular carcinoma HepG2 and breast cancer MDA-MB-231 ...

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Thermal degradation of anthocyanins and its impact on ...

Degradation products were monitored by HPLC-DAD-MS 3 to elucidate the prevailing degradation pathways. In addition, alterations of color and antioxidant properties observed upon heating were scrutinized. Most interestingly, the degradation pathways at pH 3.5 were found to differ from those at pH 1.

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Thermal degradation of polyethylene containing antioxidant ...

Immobilized BHT is inactive and it suppresses the stabilizing effect of hydrophobic silica surface in the processes of thermal oxidation at the initial stage. However, being gradually released from the surface antioxidant prolongs the resistance of the polymer against oxidation.

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Antioxidants help favorably regulate ... - Scientific Reports

However, the specific effect of antioxidants on thermal-induced degradation kinetics of omega-6 and omega-3 fatty PUFAs, along with simultaneous changes of cannabinoids has not been reported.

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Revealing the thermal oxidation ... - Scientific Reports

Hypothesis about fatty acid and antioxidant agent theory. As described in Introduction, the higher thermal-oxidation stability is the distinctive character of RBO 1,2,3,4,5,6,7, although the ...

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Characteristics of the Thermal Degradation of Glucose and ...

Characteristics of the Thermal Degradation of Glucose and Maltose Solutions Koan Sik Woo1, Hyun Young Kim1, In Guk Hwang2, Sang Hoon Lee3, and Heon Sang Jeong3 1National Institute of Crop Science, Rural Development Administration, Gyeonggi 441-857, Korea 2National Academy of Agricultural Science, Rural Development Administration, Jeonbuk 565-851, Korea

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Effect of antioxidants on thermal degradation of EPDM and XLPE

An experimental investigation of the effects of antioxidants on thermal degradation of EPDM and XLPE was carried out. We used ldquomapping methodrdquo in our FTIR spectroscopy to evaluate the degree of thermal degradation. The obtained absorbance data of FT-IR spectra were analyzed statistically. Thereby, we confirmed a clear suppressive effect of sulfur-containing phenolic antioxidant, 4-4 ...

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The antioxidant effect in controlling thermal degradation ...

It is well known that antioxidants are widely used to prevent thermal degradation of high density and linear low density polyethylene. Antioxidants are not always present in low density polyethylene and only small amounts are usually added to these resins. In this work the effect of an antioxidant system on a low density resin having MFI (190 <sup>o</sup> C/2.16 kg)=2 g/10' and density 0.9230 ...

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The antioxidant effect in controlling thermal degradation ...

Antioxidants are not always present in low density polyethylene and only small amounts are usually added to these resins. In this work the effect of an antioxidant system on a low density resin having MFI (190 °C/2.16 kg)=2 g/10′ and density 0.9230 g/cm3 has been studied.

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Investigations on thermal degradation of phytochemicals ...

The importance of lavender as a source of essential oils has been well recognized. This study reports the phytochemical profile of lavender extract in terms of chlorophylls, total carotenoids, polyphenols and flavonoids, related to antioxidant activity. The extract displayed a high polyphenolic and flavonoids content, with an antioxidant activity of 2.28±0.18 mMol Trolox/g D.W.

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Thermal Stability of Genistein and Daidzein and Its Effect ...

Soy isoflavones, present in many processed soy foods, are known for their phytoestrogenic and antioxidant activities. The aim of this work was to study the kinetics of genistein and daidzein degradation at elevated temperatures and to follow changes in their antioxidant activity. Daidzein and genistein in model solutions (pH 7 and 9) were thermally treated at 120 °C or incubated at 70, 80 ...

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The Radical Scavenging Activity and Thermal Stability of ...

The thermal treatment caused a significant degradation on the phenolic content and antioxidant activity of the nanoparticles. The energy activation (Ea) of the phenolic content and antioxidant activity was found at 35.17 kJ mol-1 and 27.91 kJ mol-1, respectively. This study suggests that the cinnamon extract-loaded nanoparticles might be ...

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Thermal degradation kinetics of ascorbic acid, thiamine ...

The pulp was processed to nectar by sugar, citric acid and water supplement up to 12-13 brix with minimum 40% puree and maximum 10% sugar. After cooling in an ice-water bath at 20-25 °C, the nectar was transferred to pyrex tubes (75 x 10 mm ID) for the treatment of thermal degradation and stored at 4 °C until thermal processing.

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Thermal Stability of Radiation Vulcanized EPDM Rubber ...

Generally, it can be seen that the thermal degradation, i.e. To, of the EPDM takes place in two steps, starting at 454 oC for the EPDM without antioxidant (So) and at higher values when either Irganox B900, IPPD were separately added or a mixture from IPPD and TMQ. Table 2: The effect of antioxidants on the TGA of irradiated EPDM.

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Characteristics of the Thermal Degradation of Glucose and ...

Characteristics of the Thermal Degradation of Glucose and Maltose Solutions Koan Sik Woo1, Hyun Young Kim1, In Guk Hwang2, Sang Hoon Lee3, and Heon Sang Jeong3 1National Institute of Crop Science, Rural Development Administration, Gyeonggi 441-857, Korea 2National Academy of Agricultural Science, Rural Development Administration, Jeonbuk 565-851, Korea

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(PDF) Effect of thermal and high hydrostatic pressure ...

For example, the Enzyme activity and dissolved oxygen of fresh fruit smoothies and their thermal and degradation constant of ascorbic acid content was lower in tomato high hydrostatic pressure processed counterparts over storage at 4 C. juice than in orange juice i.e. more stable in the former (Van den Process Storage Polyphenol Dissolved ...

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