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butylated hydroxytoluene

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https://www.readbyqxmd.com/read/28216892/antioxidant-and-hepatoprotective-potential-of-phenol-rich-fraction-of-juniperus-communis-linn-leaves
#1
Akash Ved, Amresh Gupta, Ajay Kumar Singh Rawat
BACKGROUND: Juniperus communis Linn. is an important plant in India traditional system of medicine which is widely used by different tribes in many countries. OBJECTIVE: In the present study, the antioxidant, cytotoxic and hepatoprotective activities of Juniperus communis leaves were investigated against various models. MATERIALS AND METHODS: ethanolic extract (70% v/v) of J. communis leaves was successively extracted using hexane and ethyl acetate to prepare various fractions...
January 2017: Pharmacognosy Magazine
https://www.readbyqxmd.com/read/28211691/lipophilized-grape-seed-proanthocyanidin-derivatives-as-novel-antioxidants
#2
Mingshun Chen, Shujuan Yu
Grape seed proanthocyanidin (GSP) is a natural food antioxidant. Natural proanthocyanidins (PC) in grape seed are usually polyhydroxy derivatives which exhibit hydrophilic character. GSP was modified structurally to improve its lipophilicity, expand its application in lipophilic media, and enhance its cellular absorption in vivo. Esterification of the water-soluble GSP was prepared by immobilized lipase Lipozyme TL IM with lauric acid, and their enhanced lipophilicity was confirmed by the 1-octanol/water partition coefficient...
February 17, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28159281/comparative-study-of-the-antioxidant-activities-of-some-lipase-catalyzed-alkyl-dihydrocaffeates-synthesized-in-ionic-liquid
#3
Somayeh Gholivand, Ola Lasekan, Chin Ping Tan, Faridah Abas, Leong Sze Wei
The solubility limitations of phenolic acids in many lipidic environments are now greatly improved by their enzymatic esterification in ionic liquids (ILs). Herein, four different ILs were tested for the esterification of dihydrocaffeic acid with hexanol and the best IL was selected for the synthesis of four other n-alkyl esters with different chain-lengths. The effect of alkyl chain length on the anti-oxidative properties of the resulted purified esters was investigated using β-carotene bleaching (BCB) and free radical scavenging method DPPH and compared with butylated hydroxytoluene (BHT) as reference compound...
June 1, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28159244/preparation-of-steppogenin-and-ascorbic-acid-vitamin-e-butylated-hydroxytoluene-oil-in-water-microemulsions-characterization-stability-and-antibrowning-effects-for-fresh-apple-juice
#4
Jing Tao, Qin Zhu, Fang Qin, Mingfu Wang, Jie Chen, Zong-Ping Zheng
Oil-in-water microemulsions (O/W MEs) allow the preparation of insoluble compounds into liquid. In this study, we prepared O/W MEs to improve the solubility and stability of steppogenin (S) in aqueous liquid, and studied their ability to inhibit fresh apple juice browning. The ME technique greatly increased steppogenin solubility up to 3000-fold higher than that in water. All SMEs demonstrated good stability after acceleration and long-term storage. In particular, 0.01% SME was associated with dramatic inhibition of fresh apple juice browning after 24h at room temperature and 7days at 4°C, and its antibrowning effects were further improved when combined with 0...
June 1, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28154487/evaluation-of-antioxidant-anti-cholinesterase-and-anti-inflammatory-effects-of-culinary-mushroom-pleurotus-pulmonarius
#5
Trung Kien Nguyen, Kyung Hoan Im, Jaehyuk Choi, Pyung Gyun Shin, Tae Soo Lee
Culinary mushroom Pleurotus pulmonarius has been popular in Asian countries. In this study, the anti-oxidant, cholinesterase, and inflammation inhibitory activities of methanol extract (ME) of fruiting bodies of P. pulmonarius were evaluted. The 1,1-diphenyl-2-picryl-hydrazy free radical scavenging activity of ME at 2.0 mg/mL was comparable to that of butylated hydroxytoluene, the standard reference. The ME exhibited significantly higher hydroxyl radical scavenging activity than butylated hydroxytoluene. ME showed slightly lower but moderate inhibitory activity against acetylcholinesterase (AChE) and butyrylcholinesterase than galantamine, a standard AChE inhibitor...
December 2016: Mycobiology
https://www.readbyqxmd.com/read/28133943/reversed-phase-single-drop-microextraction-followed-by-high-performance-liquid-chromatography-with-fluorescence-detection-for-the-quantification-of-synthetic-phenolic-antioxidants-in-edible-oil-samples
#6
Bahman Farajmand, Mahnaz Esteki, Elham Koohpour, Vahid Salmani
The reversed-phase mode of single drop microextraction has been used as a preparation method for the extraction of some phenolic antioxidants from edible oil samples. Butylated hydroxyl anisole, tert-butylhydroquinone and butylated hydroxytoluene were employed as target compounds for this study. High-performance liquid chromatography followed by fluorescence detection was applied for final determination of target compounds. The most interesting feature of this study is the application of a disposable insulin syringe with some modification for microextraction procedure which efficiently improved the volume and stability of the solvent micro-drop...
January 30, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28105861/a-novel-benzimidazole-and-other-constituents-with-antiproliferative-and-antioxidant-properties-from-thymelaea-microphylla-coss-et-dur
#7
Labib Noman, Feyza Oke-Altuntas, Amar Zellagui, Ayse Sahin Yaglioglu, Ibrahim Demirtas, Susana M Cardoso, Salah Akkal, Noureddine Gherraf, Salah Rhouati
A new compound (microphybenzimidazole, 7) along with the six known compounds matairesinol (1), prestegane B (2), umbelliferone (3), daphnoretin (4), microphynolide A (5) and microphynolide B (6) were isolated from Thymelaea microphylla. The structures of the pure compounds were elucidated by spectroscopic and mass-spectrometric analyses, including 1D-, 2D-NMR, and HPLC-TOF/MS. Compounds 2 and 4, as well as three fractions (F6, F6-C5, and F6-W42) obtained from a 50% (v:v) CH2Cl2:MeOH extract exhibited a selective activity against rat brain glioma cells (C6)...
January 20, 2017: Natural Product Research
https://www.readbyqxmd.com/read/28100884/stabilization-of-neem-oil-biodiesel-with-corn-silk-extract-during-long-term-storage
#8
Rehab Farouk M Ali, Ayman M El-Anany
The current study aimed to evaluate the antioxidant efficiency of different extracts of corn silk. In addition, the impact of corn silk extract on oxidative stability of neem biodiesel during storage was studied. The highest phenolics, DPPH radical scavenging and reducing power activities were recorded for methanol-water extract. The longest oxidation stability (10 h) was observed for biodiesel samples blended with 1000 ppm of corn silk extract (CSE). At the end of storage period the induction time of biodiesel samples mixed with 1000 ppm of CSE or butylated hydroxytoluene (BHT) were about 6...
January 18, 2017: Journal of Oleo Science
https://www.readbyqxmd.com/read/28067055/chemical-composition-and-antioxidant-activity-of-essential-oil-from-leaves-and-rhizomes-of-curcuma-angustifolia-roxb
#9
Sudipta Jena, Asit Ray, Anwesha Banerjee, Ambika Sahoo, Noohi Nasim, Suprava Sahoo, Basudeba Kar, Jeetendranath Patnaik, Pratap Chandra Panda, Sanghamitra Nayak
The essential oil extracted from rhizome and leaf of Curcuma angustifolia Roxb. (Zingiberaceae) was characterised by gas chromatography-mass spectrometry (GC-MS). The GC-MS analysis revealed the presence of 32 and 35 identified constituents, comprising 92.6% and 92% of total leaf and rhizome oil, respectively. Curzerenone (33.2%), 14-hydroxy-δ-cadinene (18.6%) and γ-eudesmol acetate (7.3%) were the main components in leaf oil. In rhizome oil, curzerenone (72.6%), camphor (3.3%) and germacrone (3.3%) were found to be the major constituents...
January 9, 2017: Natural Product Research
https://www.readbyqxmd.com/read/28052192/fish-in-vitro-digestion-influence-of-fish-salting-on-the-extent-of-lipolysis-oxidation-and-other-reactions
#10
Bárbara Nieva-Echevarría, Encarnación Goicoechea, María J Manzanos, María D Guillén
A study of the various chemical reactions which take place during fish in vitro digestion and the potential effect of fish salting on their extent is addressed for the first time. Farmed European sea bass fillets, raw, brine-salted or dry-salted, were digested using a gastrointestinal in vitro model. Fish lipid extracts before and after digestion were analyzed by (1)H NMR, and the headspace composition of the digestates was investigated by SPME-GC/MS. During digestion, not only lipolysis, but also fish lipid oxidation took place...
February 1, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/27965755/screening-of-potential-free-radicals-scavenger-and-antibacterial-activities-of-purwoceng-pimpinella-alpina-molk
#11
Retno Wahyuningrum, Pri Iswati Utami, Binar Asrining Dhiani, Malikhah Kumalasari, Rizka Sari Kusumawardani
Purwoceng (Pimpinella alpina Molk) is a traditional medicinal plant used for its aphrodisiac values. This plant was originated Dieng Plateu, Central Java, Indonesia. Purwoceng has been reported to contain steroid, flavonoids, glycoside, saponins, tannins, and phenolic. Based on secondary metabolite compounds of Purwoceng herbs, a research need to be done to determine the other potential free radicals scavenger and antibacterial activities of Purwoceng. The objectives of this research are to screen the potential free radicals scavenger activity of in vitro using DPPH (1,1 diphenyl-2-picryl-hydrazil) radicals and NO• (nitric oxide) radicals, and antibacterial activity of Purwoceng...
November 2016: Tropical Life Sciences Research
https://www.readbyqxmd.com/read/27941601/two-new-diphenylketones-and-a-new-xanthone-from-talaromyces-islandicus-en-501-an-endophytic-fungus-derived-from-the-marine-red-alga-laurencia-okamurai
#12
Hong-Lei Li, Xiao-Ming Li, Hui Liu, Ling-Hong Meng, Bin-Gui Wang
Two new diphenylketones (1 and 2), a new xanthone (3), and a known xanthone analogue (4) were isolated and identified from Talaromyces islandicus EN-501, an endophytic fungus obtained from the fresh collected marine red alga Laurencia okamurai. Their structures were elucidated on the basis of NMR spectroscopic and X-ray crystallographic analysis. The joint isolation of benzophenones and xanthones from the same fungal strain supports the biogenesis of xanthones via a benzophenone intermediate. It is worth mentioning that xanthones 3 and 4 have a methyl group at C-6 and C-2, respectively, which is uncommon compared with typical xanthones usually having a methyl group at C-8...
December 7, 2016: Marine Drugs
https://www.readbyqxmd.com/read/27886663/organic-impurity-profiling-of-methylone-and-intermediate-compounds-synthesized-from-catechol
#13
Erin Heather, Adam Bortz, Ronald Shimmon, Andrew M McDonagh
This work examined the synthesis and organic impurity profile of methylone prepared from catechol. The primary aim of this work was to determine whether the synthetic pathway used to prepare 3,4-methylenedioxypropiophenone could be ascertained through analysis of the synthesized methylone. The secondary aim was the structural elucidation and origin determination of the organic impurities detected in methylone and the intermediate compounds. The organic impurities present in the reaction products were identified using GC-MS and NMR spectroscopy...
November 25, 2016: Drug Testing and Analysis
https://www.readbyqxmd.com/read/27874826/optimization-and-validation-of-a-fast-uplc-method-for-simultaneous-determination-of-hydroquinone-kojic-acid-octinoxate-avobenzone-bha-and-bht
#14
Fanny Galimany-Rovira, Montse Miñarro-Carmona, Pilar Pérez-Lozano, Encarna García-Montoya, Josep R Ticó-Grau, Josep M Suñé-Negre
A previously published HPLC method for the simultaneous determination of six major components (hydroquinone, kojic acid, octinoxate, avobenzone, butylated hydroxyanisole, and butylated hydroxytoluene) in a skin-whitening cream was transferred and optimized to an ultra-performance LC system. Separation was achieved in a ZORBAX SB-Phenyl Rapid-Resolution High Throughput column (2.1 × 100 mm, 1.8 μm), using a mobile phase consisting of water with 0.1% acetic acid and acetonitrile at a flow rate of 0.7 mL/min...
September 29, 2016: Journal of AOAC International
https://www.readbyqxmd.com/read/27859283/impact-of-pecan-nut-shell-aqueous-extract-on-the-oxidative-properties-of-margarines-during-storage
#15
Paula Cristina Engler Ribeiro, Priscila de Britto Policarpi, Andrea Dal Bo, Pedro Alberto Barbetta, Jane Mara Block
BACKGROUND: The oxidative properties of margarines supplemented with pecan nut shell extracts, rosemary extract and butylated hydroxytoluene (BHT) were investigated RESULTS: The extracts of pecan nut shell and rosemary showed a high content of total phenolics and condensed tannins (93 and 102.9 mg GAE g(-1) and 46 and 38.9 mg CE g(-1) , respectively) as well as a high antioxidant activity (1257 and 2306 µmol TEAC g(-1) , and 293 and 856 mg TEAC g(-1) for ABTS and DPPH methods, respectively)...
November 17, 2016: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/27835835/effect-of-natural-antioxidants-in-spanish-salchich%C3%A3-n-elaborated-with-encapsulated-n-3-long-chain-fatty-acids-in-konjac-glucomannan-matrix
#16
P E S Munekata, R Domínguez, D Franco, R Bermúdez, M A Trindade, Jose M Lorenzo
The effect of natural antioxidants on physicochemical properties, lipid and protein oxidation, volatile compounds and free fatty acids (FFA) were determined in Spanish salchichón enriched with n-3 fatty acids encapsulated and stabilized in konjac matrix. Phenolic compounds of beer residue extract (BRE), chestnut leaves extract (CLE) and peanut skin extract (PSE) were also identified and quantified. Five batches of salchichón were prepared: control (CON, without antioxidants), butylated hydroxytoluene (BHT), BRE, CLE and PSE...
February 2017: Meat Science
https://www.readbyqxmd.com/read/27804907/effect-of-dietary-supplementation-of-grape-seed-extract-on-the-growth-performance-lipid-profile-antioxidant-status-and-immune-response-of-broiler-chickens
#17
M H Farahat, F M Abdallah, H A Ali, A Hernandez-Santana
Grape seed extracts (GSE) contain several beneficial bioactive constituents; therefore, can be utilized as a potential feed additive in broiler chickens. An experiment was conducted to investigate the effect of supplementation of broiler chicken diets with GSE as a natural antioxidant at levels of 125, 250, 500, 1000 and 2000 ppm on the growth performance, serum lipid profile, liver glutathione-reduced, thigh muscle malondialdehyde and humoral immune response against Newcastle disease virus vaccines. This experiment was performed during the life-span of chickens from 0 to 42 days of age...
November 2, 2016: Animal: An International Journal of Animal Bioscience
https://www.readbyqxmd.com/read/27775656/rp-hplc-ms-ms-analysis-of-the-phenolic-compounds-antioxidant-and-antimicrobial-activities-of-salvia-l-species
#18
Hatice Tohma, Ekrem Köksal, Ömer Kılıç, Yusuf Alan, Mustafa Abdullah Yılmaz, İlhami Gülçin, Ercan Bursal, Saleh H Alwasel
The identification and quantification of the phenolic contents of methanolic extracts of three Salvia L. species namely S. brachyantha (Bordz.) Pobed, S. aethiopis L., and S. microstegia Boiss. and Bal. were evaluated using reverse phase high performance liquid chromatography, UV adsorption, and mass spectrometry (RP-HPLC/MS). In order to determine the antioxidant capacity of these species, cupric ions (Cu(2+)) reducing assay (CUPRAC) and ferric ions (Fe(3+)) reducing assay (FRAP) were performed to screen the reducing capacity and 1,1-diphenyl-2-picrylhydrazyl (DPPH) assay was employed for evaluation of the radical scavenging activity for both solvents...
October 21, 2016: Antioxidants (Basel, Switzerland)
https://www.readbyqxmd.com/read/27725206/comparative-analysis-of-antioxidant-and-antiproliferative-activities-of-rhodomyrtus-tomentosa-extracts-prepared-with-various-solvents
#19
Hazrulrizawati Abd Hamid, Roziasyahira Mutazah, Mashitah M Yusoff, Nurul Ashikin Abd Karim, Ahmad Faizal Abdull Razis
Rhodomyrtus tomentosa (Aiton) Hassk. has a wide spectrum of pharmacological effects and has been used to treat wounds, colic diarrhoea, heartburns, abscesses and gynaecopathy. The potential antiproliferative activities of R. tomentosa extracts from different solvents were evaluated in vitro on HepG2, MCF-7 and HT 29 cell lines while antioxidant activity was monitored by radical scavenging assay (DPPH), copper reducing antioxidant capacity (CUPRAC) and β-carotene bleaching assay. Extracts from R. tomentosa show the viability of the cells in concentration-dependent manner...
October 7, 2016: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/27719940/mechanisms-and-kinetics-of-tryptophan-n-nitrosation-in-a-gastro-intestinal-model
#20
Diane de La Pomélie, Véronique Santé-Lhoutellier, Philippe Gatellier
The reaction of nitrite with different amino acids containing secondary amino groups was tested under simulated in-vitro conditions of the digestive tract. After treatment, tryptophan was the only amino acid that exhibited specific UV absorbance of nitrosamines at 335nm, supporting the assumption that it is the main source of endogenous nitrosamines. The combined effect of pH (from 2 to 6.5) and nitrite (from 0.1 to 20mM) was analyzed and the mechanisms and kinetic laws of tryptophan N-nitrosation were determined...
March 1, 2017: Food Chemistry
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