Results 151 to 160 of about 8,203 (206)

Optimization of ultrasound-assisted dispersive liquid–liquid microextraction of niacinamide in pharmaceutical and cosmetic samples using experimental design

Microchemical Journal, 2021
In this paper, an efficient and inexpensive analytical procedure using sugar alcohol-based deep eutectic solvent ultrasound-assisted dispersive liquid–liquid microextraction (DES-UA-DLLME) was optimized for the extraction of niacinamide from vitamin ...
Nail Altunay
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Cosmeceutical Aptitudes of Niacinamide: A Review

Recent Advances in Anti-Infective Drug Discovery, 2021
Background: The prevalence and scope of dermatological illness differ from region to region. Based upon type and severity, the conditions may vary from superficial to deep systemic skin infections. Niacinamide, an amide analog of vitamin B3 which was conventionally utilized as a food supplement, is now explored for the management of skin disorders ...
Piyush Madaan, Priyanshi Sikka, Deepinder Singh Malik   +2 more
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Niacin and Niacinamide Biosynthesis in Insects

Science, 1952
It has recently been shown that niacin can be formned from tryptophan in mammals (1), but cannot be formed in the larval stage of insects, such as 'The authors are indebted to K. Nakamura, M. Takanami, and S. Higashi. This work was supported in part by a grant from the Science Research Fund No. 4009, Ministry of Education.
M, Kato, Y, Hamamura
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Determination of Niacinamide in Pharmaceutical Preparations

Journal of Pharmaceutical Sciences, 1969
A method for the isolation of niacinamide from multi-component pharmaceutical preparations by partition chromatography between a diatomaceous earth-water column and chloroform followed by measurement of UV absorbance at 262 mμ is proposed. A second method using the color produced by the niacinamide in the column eluate with bromothymol blue in ...
M T, Jeffus, C T, Kenner
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Niacinamide in canned tomato sauce

Bulletin of Environmental Contamination and Toxicology, 1984
Au cours d'une recherche de pesticides dans de la sauce tomate en boite, mise en evidence d'une reponse analytique inconnue d'un compose contenant de l'azote. Identification par chromatographie en phase gazeuse-spectrometrie de masse de la niacinamide (amide de l'acide pyridine-3 carboxylique, ou vitamine B3) a la dose de 3-4 ...
T, Cairns, E G, Siegmund, G M, Doose
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Rate Studies on the Hydrolysis of Niacinamide

Journal of Pharmaceutical Sciences, 1962
Abstract The apparent first-order rate constant corresponding to the hydrolysis of niacinamide has been determined over the pH range 0.4–11.3 in purely aqueous solutions at 89.4. Although the pH-rate profile shows a minimum between pH 4 and 6, the reaction velocity is relatively slow over the usual pharmaceutical range. Surprisingly, the second-order
P, FINHOLT, T, HIGUCHI
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Direct Determination of Niacinamide in Multivitamin Preparations

Journal of Pharmaceutical Sciences, 1961
Abstract A simple method for the direct determination of niacinamide in pharmaceutical preparations is described. The method involves the reaction of niacinamide in potassium dihydrogen phosphate with cyanogen bromide and barbituric acid. The resulting purple color has a maximum absorbance at 550 m μ . Niacin does not interfere in the reaction unless
O, PELLETIER, J A, CAMPBELL
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Niacinamide

Dermatologic Surgery, 2005
In multiple chronic clinical studies, topical niacinamide (vitamin B3) has been observed to be well tolerated by skin and to provide a broad array of improvements in the appearance of aging facial skin (eg, reduction in the appearance of hyperpigmentated spots and red blotchiness).To clinically determine the effect of topical niacinamide on additional ...
Donald L, Bissett, John E, Oblong, Cynthia A, Berge   +2 more
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Niacinamide and Acanthosis Nigricans

Archives of Dermatology, 1984
To the Editor.— A side effect of high-dose niacinamide therapy, not mentioned in the October 1983,Archivesarticle entitled "Response of Generalized Granuloma Annulare to High-Dose Niacinamide," 1 is acanthosis nigricans. The following cases, encountered recently, illustrate the potential for a reaction when the association is overlooked.
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Polarographic assay of niacinamide in pharmaceutical preparations

Journal of Pharmaceutical Sciences, 1969
A rapid polarographic determination of niacinamide pharmaceutical preparations had been developed and is compared with the Konig colorimetric assay using barbituric acid. The niacinamide is extracted from the sample using a combination column and liquid-liquid partition chromatography. The extracted niacinamide is determined in a supporting electrolyte
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