Quality Analysis of Liquid Adjuncts Flashcards
What does Dextrose Equivalent (DE) measure in sugar syrups?
The extent to which starch molecules have been converted to sugar
DE is the percentage of reducing end-groups in the syrup compared to pure dextrose.
What is a reducing sugar?
A sugar that can donate electrons due to a free aldehyde group
Dextrose acts as a reducing sugar because it has a free aldehyde group.
What is the DE value of pure starch?
0
Pure starch has no reducing ends available.
What is the DE value of dextrose/glucose?
100%
This indicates complete conversion to reducing sugar.
What range of DE values do dextrins have?
1 to 13%
Dextrins contain some reducing ends but not as many as dextrose.
What is the DE range for maltodextrins?
3 to 20%
Maltodextrins are partially hydrolyzed starches.
What is the DE value of maltose?
52%
Maltose contains reducing ends but is less than dextrose.
What is the standard method for measuring DE in syrups?
Lane-Eynon titration
This method measures the sugar’s ability to reduce copper sulfate.
True or False: Lane-Eynon titration is commonly used in the brewing industry.
False
Its use is uncommon in brewing despite being a standard method.
What does a high DE indicate about a syrup’s fermentability?
It may not indicate high fermentability
A syrup can have high DE but be low in fermentability due to dextrins.
What does Brix measure in a solution?
The w/w % of sucrose
1% Brix equals 1 g of sucrose in 99 g of water.
How is Brix expressed?
As % or °Brix
It quantifies the concentration of dissolved substances in a liquid.
What instrument is used to measure Brix?
Refractometer
It measures the degree of refraction of light in the solution.
What is the minimum DE for high maltose syrup according to the analysis sheet?
40
This is part of the quality assurance for syrup production.
What is the maximum Brix° at 25°C for high maltose syrup?
84
This refers to the maximum concentration of sucrose in the syrup.
What is the pH range for a 1:1 aqueous solution of high maltose syrup at 25°C?
4 to 6
pH is crucial for stability and fermentation processes.
Fill in the blank: The appearance of high maltose syrup should be _______.
Colourless to high yellow coloured syrup
This indicates the visual quality of the syrup.
What are the maximum allowable levels for E. coli in high maltose syrup?
Absent/10 gm
This is a safety standard to prevent contamination.
What are the acceptable levels for Total Plate Count in high maltose syrup?
2,500 cfu/gm Max
A measure of microbial contamination in food products.
What is the maximum level of Arsenic in high maltose syrup?
1.0 Max mg/kg
This is a safety standard to avoid toxic contamination.
What is the maximum level of heavy metals (Lead) in high maltose syrup?
1.0 Max mg/kg
Similar to Arsenic, this is to ensure food safety.
