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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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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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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SD6020 · GLYCEROL

SD6020-GLYCEROL

SD6020 GLYCEROL

Enzymatic method for glycerol measurement

Glycerol (or glycerin) is a natural byproduct of alcoholic fermentation, providing body-to-mouth sensation. The glycerol content is directly related to the degree of maturity of the grape, the microorganisms present and the fermentation procedure used (temperature, yeast species, nitrogen source).

ADVANTAGES

Single reagent

KIT FORMAT

R1: 2 x 30 mL
CTRL inc.

METHOD
Enzymatic: HK/GPO/POD

READING
Differential bi-reagent, 340 nm

RANGE
Up to 12 g/L (0.40 g/L, per dilution factor 30)

LIMIT OF QUANTIFICATION (LoQ))
0,01 g/L

TESTS (Estimated)
180

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SD6024 · POLYPHENOLS

SD6024-POLYPHENOLS

SD6024 POLYPHENOLS

Colorimetric method for total polyphenols measurement

The phenolic compounds of wine (natural phenols and polyphenols) are a broad group of chemical compounds that affect the taste, color and mouthfeel of the wine that come from the skin, pulp and seed of the grape. The specific distribution of the same is that which gives the wine its own characteristics, identifying the type of grape used and the process of elaboration. Its main function is to control the natural oxidation of the wine during the ripening and aging process and increase the stability of its organoleptic properties.

ADVANTAGES

-

KIT FORMAT

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

METHOD
Colorimetric: Folin-Ciocalteu

READING
Differential bi-reagent, 670 nm

RANGE
Up to 3000 mg/L

LIMIT OF QUANTIFICATION (LoQ)
22 mg/L

TESTS (Estimated)
135

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