Formulation and characterization of water-in-oil nanoemulsions loaded with açaí berry anthocyanins: Insights of degradation kinetics and stability evaluation of anthocyanins and nanoemulsions

In view of the increase in the number of cosmetic preparations containing antioxidant vitamins, chiefly, due to their action in preventing the process of skin aging, there is a need to develop pre-formulation studies and to validate analytical methods in order to obtain high quality products. Thus, the objective of this research was to evaluate and compare the thermal behavior of tocopheryl acetate and ascorbyl tetraisopalmitate as raw materials, and incorporated into a base cream. Thermogravimetry (TG / DTG) and differential scanning calorimetry (DSC) were used for this purpose. Both vitamins were found to be stable up to 250ºC. The base cream (placebo) and the sample (base cream containing the vitamins) presented different weight loss. Thermal analysis has shown itself to be an excellent tool for the characterization of these vitamins and can be used in routine analysis for quality control of this type of cosmetic formulation.

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Erratum to “Characterization of a homologous series of d,l-lactic acid oligomers: a mechanistic study on the degradation kinetics in vitro”

Biomaterials ◽

10.1016/j.biomaterials.2004.04.009 ◽

2005 ◽

Vol 26 (7) ◽

pp. 827 ◽

Cited By ~ 1

Author(s):

Gesine Schliecker ◽

Carsten Schmidt ◽

Stefan Fuchs ◽

Thomas Kissel

Keyword(s):

Lactic Acid ◽

Homologous Series ◽

Degradation Kinetics ◽

Mechanistic Study

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Synthesis and characterization of stimuli-responsive hydrogel based on starch and methyl-3-aminocrotonate: swelling and degradation kinetics

Polymer Bulletin ◽

10.1007/s00289-018-2524-6 ◽

2018 ◽

Vol 76 (6) ◽

pp. 3073-3092 ◽

Cited By ~ 1

Author(s):

Muhammad Aslam Malana ◽

Faryal Aftab ◽

Syeda Rabia Batool

Keyword(s):

Degradation Kinetics ◽

Synthesis And Characterization ◽

Stimuli Responsive

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Synthesis and Characterization of Green Tea Stabilized Iron Nanocatalysts for Brymothymol Blue (BTB) Degradation

Journal of Nano Research ◽

10.4028/www.scientific.net/jnanor.42.1 ◽

2016 ◽

Vol 42 ◽

pp. 1-13

Author(s):

David Mutuku Katithi ◽

Immaculate N. Michira ◽

Peterson M. Guto ◽

Priscilla Gloria Lorraine Baker ◽

Geoffrey N. Kamau ◽

...

Keyword(s):

Green Tea ◽

Dye Degradation ◽

Degradation Kinetics ◽

Environmental Pollutant ◽

X Ray Diffraction ◽

Tunneling Microscopy ◽

X Ray ◽

First Order Kinetics ◽

Different Temperatures

Iron nanoparticles (FeNPs) were prepared from the green tea extracts at different temperatures through green synthesis procedure and characterized by various physicochemical techniques like UV-Visible spectroscopy, FTIR Spectroscopy, energy dispersive X-ray spectrometry (EDS), X-ray diffraction and high resolution tunneling microscopy (HRTEM) and the results confirmed the synthesis of polydisperse and stable FeNPs by the tea extracts. The catalytic activity of FeNPs was investigated using a common environmental pollutant BTB often used in textile industries for dyeing purposes. In these tests, catalytic degradation of BTB with FeNPs at a 10 μL or 30 μL concentration was done in the presence of 2% hydrogen peroxide. Results show no BTB degradation in the absence of the FeNPs. However, a 38% and 68% degradation of BTB was realized in the presence of 10μL and 30 μL FeNPs respectively indicating that the iron nanocatalysts were responsible for the dye degradation. The BTB degradation kinetics was found to follow pseudo-first order kinetics with rate constants at the two catalyst concentrations being 0.023 min-1 and 0.063 min-1 respectively.

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