On-line dilution and detection of vainillin in vanilla extracts obtained by ultrasound

Valdez-Flores, Claudia; Macías, María del Pilar Cañizares

doi:10.1016/j.foodchem.2007.02.028

Cited by 18 publications

(12 citation statements)

References 27 publications

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“…The high sensitivity of UV spectroscopy has limited its application as a PAT tool in the pharmaceutical manufacturing processes where UV absorbance is too strong. Online dilution followed by UV detection is a method used in analytical chemistry to solve the problem of excessive absorbance, and the applications have been reported in the field of food analysis and pharmaceutical analysis . In this study, an online dilution and UV‐detection device (Fig.…”

Section: Methodsmentioning

confidence: 99%

Multivariate data analysis of UV spectra in monitoring elution and determining endpoint of chromatography using polyamide column

Yan

2013

J of Separation Science

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Chromatography using polyamide column is one of the most critical purification operations that affect the safety and efficacy of traditional Chinese medicine (TCM) products. To ensure successful operation and reduce time and solvent consumption, UV spectroscopy combined with multivariate data analysis as an online analytical tool was developed for monitoring the polyamide column chromatography of the TCM Danshen. The process trajectories were established by principal component analysis of the UV spectra and used to determine the endpoint of the washing stage and investigate the impacts of the process conditions. The online analysis method developed determined the concentration of salvianolic acid B (an important compound in Danshen) in the effluent rapidly and precisely with a coefficient of determination of 0.9963 and helped to collect salvianolic acid B quantitatively for determining the endpoint of elution. The methodology proposed is an effective approach applicable in guiding successful operations in the chromatographic separation.

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Section: Methodsmentioning

confidence: 99%

Multivariate data analysis of UV spectra in monitoring elution and determining endpoint of chromatography using polyamide column

Yan

2013

J of Separation Science

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“…As a case study for SEIRA and SPR, we used vanillin (4-hydroxy-3-methoxybenzaldehyde) as an analyte molecule. Vanillin is the major compound of the vanilla bean [51] and can be chemically synthetized for mass production. It finds applications in food, pharmaceuticals and perfumery [52].…”

Section: Resonant Seira and Spr Sensing Demonstrationmentioning

confidence: 99%

Highly doped semiconductor plasmonic nanoantenna arrays for polarization selective broadband surface-enhanced infrared absorption spectroscopy of vanillin

et al. 2017

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Tailored plasmonic nanoantennas are needed for diverse applications, among those sensing. Surfaceenhanced infrared absorption (SEIRA) spectroscopy using adapted nanoantenna substrates is an efficient technique for the selective detection of molecules by their vibrational spectra, even in small quantity. Highly doped semiconductors have been proposed as innovative materials for plasmonics, especially for more flexibility concerning the targeted spectral range. Here, we report on rectangularshaped, highly Si-doped InAsSb nanoantennas sustaining polarization switchable longitudinal and transverse plasmonic resonances in the mid-infrared. For small array periodicities, the highest reflectance intensity is obtained. Large periodicities can be used to combine localized surface plasmon resonances (SPR) with array resonances, as shown in electromagnetic calculations. The nanoantenna arrays can be efficiently used for broadband SEIRA spectroscopy, exploiting the spectral overlap between the large longitudinal or transverse plasmonic resonances and narrow infrared active absorption features of an analyte molecule. We demonstrate an increase of the vibrational line intensity up to a factor of 5.7 of infrared-active absorption features of vanillin in the fingerprint spectral region, yielding enhancement factors of three to four orders of magnitude. Moreover, an optimized readout for SPR sensing is proposed based on slightly overlapping longitudinal and transverse localized SPR.

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“…A peristaltic pump (Gilson minipuls), an injection valve (Rheodyne), Teflon and Tygon tubing, a Hellma 18 µL internal volume flow cell and a Cary UV-Vis spectrophotometer (Varian) as detector were used to build the FI manifold. A FI manifold reported by Valdéz and Cañizares [7] was used to determine vanillin.…”

Section: Instrumentsmentioning

confidence: 99%

“…A flow injection manifold was used to quantify vanillin in accordance with Valdez and Cañizares [7]. 100 µl of sample were injected into a carrier of 0.01 N NaOH, which carries the sample to the reactor where the vanillin was hydrolyzed.…”

Section: Determination Of Vanillinmentioning

confidence: 99%

“…Among non-volatiles compounds of vanilla are: tannins, polyphenols, free amino acids and resins and among volatiles compounds are: carbonyl aromatic and aliphatic alcohols, aromatic acids, aromatic esters, phenols, lactones, aliphatic and aromatic hydrocarbons, terpenoids, etc. Vanillin (1% -3%), vanillic acid (0.1% -0.2%), p-hydroxy-benzaldehyde (0.1% -0.2%) and p-hydroxybenzoic acid (0.01% -0.02%) are the most important phenolics compounds produced during cured process [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Antioxidant Capacity in Vanilla Extracts Obtained by Applying Focused Microwaves

Rojas-López¹,

Cañizares-Macías²

2013

FNS

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ORAC method and a continuous flow injection method based on Folin-Ciocalteau reaction (FI-FC) were used for determining the antioxidant activity in extracts obtained by using focused microwaves. Analysis of the antioxidant capacity (AC) of the main compounds of vanilla (vanillin, p-hydroxybenzaldehyde, p-hydroxybenzoic acid and vanillic acid) was also carried out. Vanilla extracts obtained by using focused microwaves had a higher AC (between 72% and 117%) than the obtained by conventional methods. Vanillin had a linear correlation with the antioxidant capacity of the extracts and it is the most influential compound in the antioxidant power. The AC calculated by the ORAC method and the FI-FC method had a ratio 2:1 because of different kinetics and reaction mechanisms of the antioxidants with the reagents, so it is necessary more than one method to establish the antioxidant power in food. On base on the results of the present study microwaves energy can be used to obtain vanilla extracts to improve the AC of them.

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On-line dilution and detection of vainillin in vanilla extracts obtained by ultrasound

Cited by 18 publications

References 27 publications

Multivariate data analysis of UV spectra in monitoring elution and determining endpoint of chromatography using polyamide column

Multivariate data analysis of UV spectra in monitoring elution and determining endpoint of chromatography using polyamide column

Highly doped semiconductor plasmonic nanoantenna arrays for polarization selective broadband surface-enhanced infrared absorption spectroscopy of vanillin

Antioxidant Capacity in Vanilla Extracts Obtained by Applying Focused Microwaves

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