Determination of total phenolic content using the Folin-C assay: Single-laboratory validation, first action 2017.13

S Kupina, C Fields, MC Roman… - Journal of AOAC …, 2018 - academic.oup.com
A single-laboratory validation of a method using Folin & Ciocalteu’s phenol reagent (Folin-C
reagent) for determination of total phenolic content of selected dietary supplement extracts …

Determination of tartaric, malic, and citric acids in grape juice and wine using gradient ion chromatography

SA Kupina, CA Pohl… - American journal of …, 1991 - Am Soc Enol Viticulture
A gradient ion chromatographic (IC) method with conductivity detection and chemical
suppression was evaluated for the separation and quantification of major organic acids in grape …

Evaluation of a Fourier transform infrared instrument for rapid quality-control wine analyses

SA Kupina, AJ Shrikhande - American Journal of Enology …, 2003 - Am Soc Enol Viticulture
… However, since the instrument’s SEC at two standard deviations satisfied Canandaigua’s
target accuracy agreement requirement of at least two times the standard deviation of the …

An improved capillary electrophoresis procedure for the determination of organic acids in grape juice and wine

T Kandl, S Kupina - American journal of enology and …, 1999 - Am Soc Enol Viticulture
Major organic acids in grape juice and wine were separated and quantified by an improved
capillary electrophoretic (CE) method. Indirect UV detection with 2,6-pyridinedicarboxylic …

[PDF][PDF] Determination of total phenolic content using the Folin-C assay: Single-laboratory validation, first action 2017.13

S Kupina, C Fields, MC Roman… - Journal of AOAC …, 2019 - researchgate.net
Phenols are first extracted in water, then reacted with the Folin-C reagent (a complex mixture
of heteropolyphosphotungstatemolybdate) in the presence of sodium carbonate to form a …

Simultaneous quantitation of glycerol, acetic acid and ethanol in grape juice by high performance liquid chromatography

SA Kupina - American journal of enology and viticulture, 1984 - Am Soc Enol Viticulture
The simultaneous quantitation of glycerol, acetic acid and ethanol in grape juice by high
performance liquid chromatography (HPLC) has been accomplished in 11 minutes using a …

Determination of total carbohydrates in wine and wine-like beverages by HPLC with a refractive index detector: First action 2013.12

S Kupina, M Roman… - Journal of AOAC …, 2014 - academic.oup.com
An international collaborative study was conducted of an HPLC-refractive index (RI) detector
method for the determination of the combined amounts of sugars, glycerol, organic acids, …

[PDF][PDF] Adulteration of grape seed extract

S Kupina, S Gafner - Botanical Adulterants Bulletin, 2016 - polyphenolics.com
… 1.7 General use(s): GSE is known as a dietary ingredient and a number of commercial
materials have received selfaffirmed “generally recognized as safe” (GRAS) status as a food …

[PDF][PDF] Etiological role of opportunistic microflora in the pathogenesis of implant-associated inflammation after primary total knee replacement

…, YA Chibrikova, RG Adilov, ES Kupina - Journal of Medical …, 2018 - sarmj.org
Objective: to investigate etiological role of opportunistic microflora in the pathogenesis of
implant-associated inflammation in patients after primary knee replacement and antibiotic …

Analysis of gluconic acid in botrytised wines

BH Gump, SA Kupina - … Analysis of Food and Beverages V2, 2012 - books.google.com
Gluconic acid is the oxidized product (aldonic acid) of glucose. That is, the aldehyde group
of glucose has been oxi—dized to the carboxyl group by the action of the enzyme, glu-cose …