Nicotinic Acid
Mostrando 1-12 de 272 artigos, teses e dissertações.
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1. HIDAZIDA 6-HIDRAZINONICOTÍNICA: SÍNTESE QUIMIO E REGIOSSELETIVA DE PIRIDINOHIDRAZONAS, ÁCIDOS PIRAZOLIL-NICOTÍNICOS E HETEROCICLOS DERIVADOS / 6-HYDRAZINONICOTINIC ACID HYDRAZIDE: CHEMO AND REGIOSELECTIVE SYNTHESIS OF PYRIDINE-HYDRAZONES, PYRAZOLYL-NICOTINIC ACIDS AND HETEROCYCLIC DERIVATIVES
Este trabalho descreve, inicialmente, o estudo de métodos de hidrólise para a ligação amídica [C(O)-N] em 2-[3-alquil(aril/heteroaril)-5-hidróxi-5-trifluormetil-4,5-diidro-1H-pirazol-1-il]-5-[3-alquil(aril/heteroaril)-5-hidróxi-5-trifluormetil-4,5-diidro-1H-carbonilpirazol-1-il]piridinas (2), sendo alquila = CH3, arila = C6H5, 4-OCH3C6H4, 4,4-BiPh e h
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 20/04/2012
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2. Studies on trigonelline from Moringa oleifera and its in vitro regulation by feeding precursor in cell cultures
Trigonelline (N-methylnicotinate) biosynthesized from nicotinate is one of the metabolically active pyridine alkaloid, widely distributed in plant kingdom. In the present study trigonelline has been isolated from various plant parts and callus cultures of Moringa oleifera Lam., Moringaceae, and was identified using TLC, GLC, GC-MS, which was comparable to th
Rev. bras. farmacogn.. Publicado em: 03/04/2012
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3. A intrigante bioquímica da niacina: uma revisão crítica
Niacin (nicotinamide, nicotinic acid) interferes on homeostasis, DNA regulation, signaling and longevity. Nicotinic acid reduces synthesis of lipoproteins-apo-B and increases HDL. Its antilipemic action in liver produces: 1) inhibition of DGAT2, with decreased triacylglycerol synthesis, 2) downregulation of the b-chain of adenosine triphosphate synthase, lea
Química Nova. Publicado em: 2011
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4. Constantes de acidez de ácidos dipróticos a partir de titulações potenciométricas: ilustração dos princípios do cálculo através da construção de um algoritmo muito simples
This work describes the creation of an very simple calculation algorithm, based in basic chemical and mathematic principles, for the calculation of weak diprotic acid dissociation constants as, for example, amino acids, from potentiometric titrations. For an easier understanding of the algorithm the logical reasoning of this calculus is schematized in a diag
Química Nova. Publicado em: 2011
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5. Teores de compostos bioativos em cafés torrados e moídos comerciais
The amounts of nicotinic acid, trigonelline, 5-CQA, caffeine, kahweol and cafestol in 38 commercial roasted coffees ranged from 0.02 to 0.04; 0.22 to 0.96; 0.14 to 1.20; 1.00 to 2.02; 0.10 to 0.80 and 0.25 to 0.55 g/100 g, respectively. Evaluation of color and content of thermo-labile compounds indicated similarity in roasting degree. Differences in the leve
Química Nova. Publicado em: 2010
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6. Estudo dos componentes protéicos da peçonha da serpente Micrurus frontalis (serpentes: elapidae)
Coral snakes (Micrurus genus) venoms contain a wide spectrum of biologically active proteins and peptides. The major obstacle to study Micrurus venoms is the small amount of material that can be collected. Therefore, the biochemistry and pharmacology of components from coral snakes venoms are mostly unknown. In this study we describe the isolation, molecular
Publicado em: 2010
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7. Nutrient balance and metabolic analysis in a Kluyveromyces marxianus fermentation with lactose-added whey
Addition of lactose on whey to produce an alcoholic product by fermentation is optimized in order to maximise final ethanol concentrations and lactose consumption. The effect of the supplementation of the broth with yeast extract, ammonium sulphate, oxygen, protein, peptides and the vitamins nicotinic acid, biotin, pantothenic acid and inositol on aerobic ce
Brazilian Journal of Chemical Engineering. Publicado em: 2009-09
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8. Multivariable parameter optimization for the endoglucanase production by Trichoderma reesei Rut C30 from Ocimum gratissimum seed
The aim of this study was to evaluate the interaction effects of the physico-chemical parameters on the endoglucanase (CMCase) production by Trichoderma reesei Rut C30 on a cellulosic agro-residue by the solid-state fermentation (SSF) and to determine their optimum values by the EVOP factorial design technique. The best combination of physical parameters for
Brazilian Archives of Biology and Technology. Publicado em: 2008-02
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9. Metodologia para análise simultânea de ácido nicotínico, trigonelina, ácido clorogênico e cafeína em café torrado por cromatografia líquida de alta eficiência
A reverse phase liquid chromatography method was developed for simultaneous determination of trigonelline, caffeine, nicotinic and chlorogenic (5-CQA) acids in roasted coffee. A gradient of acetic acid/acetonitrile was used as mobile phase and detection was carried out in the UV. The samples were extracted with acetonitrile/water (5:95 v/v) at 80 ºC/10 min.
Química Nova. Publicado em: 2006-12
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10. Técnicas de cultivo in vitro e microenxertia ex vitro visando a eliminação do Cowpea Aphid-Borne Mosaic virus em Maracujazeiro-Azedo
The sour passion fruit plant (Passiflora edulis Sims f. flavicarpa Deg.) is one of the most important Brazilian fruitbearings and its cultivation presents good perspectives of expansion. The culture development has been made more difficult by diseases, specially the fruit hardening disease, caused by the Cowpea aphid-borne mosaic virus (CABMV). The virus eli
Publicado em: 2006
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11. Socioeconomic, nutritional and antioxidants profile in young smokers from the city of Viçosa MG / Perfil socioeconômico, nutricional e de antioxidantes de jovens fumantes, do município de Viçosa-MG
With the objective of comparing the socioeconomic, nutritional and antioxidant profile of young smoking and non smoking subjects, a controlled transversal study was conducted. Smokers and non smokers were selected from educational institutions from the city of Viçosa MG. It was considered as smoker the individual that smoked at least one cigarette daily, fo
Publicado em: 2006
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12. Discriminação de espécies de café (Coffea arabica e Coffea canephora) em diferentes graus de torra
O café é um dos produtos agrícolas de maior importância na economia mundial. Seu cultivo se baseia nas espécies Coffea arabica e Coffea canephora (conilon). A diferença de preço incentiva a adição de conilon, de menor valor comercial e qualidade sensorial, ao arábica. Após a torra e moagem, não é possível a distinção visual das espécies, pod
Publicado em: 2005