Search for tag: "absorbance"

VEN123L Video 10.1 - Phenols and Color: Spectrophotometric Analysis

How can a spectrophotometer be used to quantify phenols and characterize wine color? What are the contributors to wine color and how can they be chemically distinguished from one another?

From  Thi Nguyen on August 11th, 2021 0 likes 9 plays 0  

VEN123L Video 8.2 - Malic Acid: Enzymatic Analysis

How can malic acid be quantified when tracking the progress of malolactic fermentation? What are some similarities and differences between the analyses of malic acid and residual sugar? What are the…

From  Thi Nguyen on August 11th, 2021 0 likes 3 plays 0  

VEN123L Video 8.1 - Residual Sugar - Enzymatic Analysis

How do we know when we're really done with fermentation? How does enzymatic analysis work? What are the components of an enzymatic assay kit? Copyright Thi Nguyen Do not distribute without…

From  Thi Nguyen on November 14th, 2020 0 likes 161 plays 0  

VEN123L Video 6.1 - Copper - Flame Atomic Absorption Spectroscopy

How is atomic spectroscopy different from molecular spectrophotometry? What's going on inside an atomic spectrometer? How is copper analyzed by flame atomic absorption spectroscopy? Copyright…

From  Thi Nguyen on October 15th, 2020 0 likes 107 plays 0  

VEN123L Video 5.3 - Free Alpha-Amino Nitrogen - Analysis

How do we prepare juice samples for the analysis of free alpha-amino nitrogen? How do we perform dilutions? How do we deal with sample background noise during spectrophotometric analysis? How do we…

From  Thi Nguyen on September 2nd, 2020 0 likes 115 plays 0  

VEN123L Video 5.2 - Free Alpha-Amino Nitrogen - Calibration

What is calibration? How do we prepare standards for external calibration and how do we make a calibration curve? How do we give the spectrophotometer a baseline, to measure just what we're…

From  Thi Nguyen on August 31st, 2020 0 likes 124 plays 0