SD6014 · ANTHOCYANINS

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SD6014 ANTHOCYANINS

Colorimetric method for anthocyanins measurement

Anthocyanins are primarily responsible for the color in red wine and especially contribute to the astringency sensation of the wine. At the beginning of the maturation process they form simple complexes with other compounds present in the wine giving rise to a progressive change in the color of the wine (turning to blue tones) but as maturation progresses these compounds tend to form other compounds (often polymers) a lot more stable in color with respect to pH and sulphites. The proportion between the different compounds present (simple and polymeric) is directly related to the final color obtained and its stability. This determination allows the concentration of non-polymeric (ionizable) anthocyanins to be established.

ADVANTAGES

Single reagent

KIT FORMAT

R1: 2 x 30 mL

METHOD
Colorimetric: Metavanadate

READING
Differential mono-reagent, 520 nm

RANGE
Up to 800 mg/L

LIMIT OF QUANTIFICATION (LoQ)
0,4 mg/L

TESTS (Estimated)
280

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SD6015 · CALCIUM

SD6015-CALCIUM

SD6015 CALCIUM

Colorimetric method for calcium measurement

Calcium is a natural element in the must, although in certain manufacturing processes calcium salts (calcium carbonate for acidity reduction) and other calcium-rich substances (casein for clarification) can be added. The solubility of calcium decreases with increasing alcohol content, easily reaching supersaturation. In these cases there is a risk of causing calcium tartrate precipitates (and in some cases calcium oxalate) during aging inside the bottle, since its formation is very slow. This problem is particularly relevant in white wines because of its visibility. The control of calcium levels makes it possible to force the precipitation of said crystals, and their subsequent filtration, as part of the manufacturing process.

ADVANTAGES

Liquid reagent ready-to-use
Standard included

KIT FORMAT

R1: 1 x 30 mL
R2: 1 x 30 mL
CTRL inc.

METHOD
Colorimetric: CPC

READING
Method differential bi-reagent, 560 nm

RANGE
Up to 100 mg/L

LIMIT OF QUANTIFICATION (LoQ)
5 mg/L

TESTS (Estimated)
140

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SD6016 · CATECHINS

SD6016-CATECHINS

SD6016 CATECHINS

Colorimetric method for catechins measurement

Catechins are a group of flavonoid polyphenols found mainly in the seeds and to a lesser extent in the skin. They occur naturally as a defense mechanism against berry infections, so their concentration is higher in varieties grown in humid weather. They are responsible for the bitter notes in the taste of the wine and, because they have antioxidant properties, they contribute to provide color stability during the ripening process. The content of catechins in the sample is directly related to the crushing process and the period of contact with the grape skin.

ADVANTAGES

Liquid reagent ready-to-use
High sensitivity - LoQ 6 mg/L
Standard included

KIT FORMAT

R1: 1 x 30 mL
R2: 1 x 30 mL
CTRL inc.
STD inc.

METHOD
Colorimetric: Cinnamaldehyde

READING
Differential bi-reagent, 620 nm

RANGE
Up to 500 mg/L

LIMIT OF QUANTIFICATION (LoQ)
6 mg/L

TESTS (Estimated)
140

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SD6018 · COPPER

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SD6018 COPPER

Colorimetric method for copper measurement

The presence of copper in wine is common due to both the phytosanitary treatments carried out on the grapes, as well as the controlled addition of copper salts as part of the winemaking process. Most of the copper is precipitated in the form of sulphides and subsequently filtered. However, a high residual concentration thereof is toxic and can severely affect the alcoholic fermentation process, accelerate phenolic oxidation, cause turbidity and produce precipitates in reducing media. The control of copper concentration is essential to ensure both stability during the ripening process and ensure safe consumption.

ADVANTAGES

Liquid reagent ready-to-use
High sensitivity - LoQ 0,3 mg/L (white and rosé wine)
Single reagent
Standard included

KIT FORMAT

R1: 1 x 30 mL
R2: 1 x 30 mL
CTRL Inc
STD Inc.

METHOD
Colorimetric: 3,5-DiBr-PAESA

READING
Differential mono-reagent, 560 nm

RANGE
Up to 2 mg/L

LIMIT OF QUANTIFICATION (LoQ)
0,1 mg/L

TESTS (Estimated)
140

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SD6019 · COLOR INDEX

Photography SINATECH Reagents DIONYSOSi n progress

SD6019 COLOR INDEX

Colorimetric method for color index measurement

The color of the wine is the result of the mixture of different colored compounds, mainly of reddish tones (mainly anthocyanins), blue (iron complexes) and yellow (catechins). The color index is an indicator that takes into account absorption at 420, 520 and 620 nm.

ADVANTAGES

Liquid reagent ready-to-use

KIT FORMAT

R1: 4 x 30 mL

METHOD
Colorimetric

READING
Direct absorbance

RANGE
Up to 16,50 OD

LIMIT OF QUANTIFICATION (LoQ)
0,11 (A420), 0,14 (A520), 0,12 (A620)

TESTS (Estimated)
200 (x3)

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