#Polarimetric sucrose content (pol)
In Ukrainian: Поляриметричний вміст сахарози (Pol)
Also: pol, polarisation, polarization, w(S,Pol), °Z
Basis: % of the original sample mass; polarimetric results are expressed in °Z.
Sucrose content determined by polarimetry under ICUMSA SPS-1: a solution of the product rotates the plane of polarised light, and the share of sucrose is calculated from the angle. For beet, juices, syrups and finished sugar it is the basic laboratory parameter.
ICUMSA calls the parameter “polarimetric sucrose content” and notes that the familiar “pol” has often been used loosely. The site keeps “Pol” as the familiar field label and search variant.
In the A-ENERGY calculator (apparent purity) enter the laboratory result on the original sample mass basis. If the sample was diluted, use the result recalculated according to your laboratory method, not the instrument reading for the diluted solution.
Not to be confused with: Polarisation of finished white sugar (a trade requirement, e.g. not less than 99.7 °Z in Directive 2001/111/EC and Codex CXS 212-1999) is the same method applied to a different object for a different purpose. True sucrose content (chromatography) is a separate parameter.
Related: calculator «Apparent purity» · Degree Z (°Z) · Apparent purity · Sugar content of beet
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#Degree Z (°Z)
In Ukrainian: Градус міжнародної цукрової шкали (°Z)
Also: degree Z, International Sugar Scale, ISS, °Z, Z
Unit: °Z; by the ICUMSA definition 1 °Z corresponds to 1 g/100 g.
The unit in which a polarimetric result is expressed on the International Sugar Scale. The scale is defined so that 100 °Z corresponds to the normal solution of pure sucrose and 1 °Z to a mass fraction of 1 g/100 g.
°Z replaced the older °S. For finished sugar the result in °Z is the trade “polarisation”; for juices and syrups that are diluted before measurement, the laboratory recalculates the result to the original product.
In the A-ENERGY calculator the field “Pol, % by sample mass” takes that recalculated result; °Z there is only the unit of the finished laboratory result, not a reading for the diluted solution.
Not to be confused with: Instrument readings for the normal or diluted solution before recalculation; angular degrees of optical rotation (°); °S of the old scale.
Related: calculator «Apparent purity» · Polarimetric sucrose content (pol) · ICUMSA
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#Degree Brix (°Bx)
In Ukrainian: Градус Брікса (°Bx)
Also: Brix, Bx
Unit: °Bx (refractometer scale calibrated on pure sucrose solutions).
The scale on which a refractometer shows the mass fraction of sucrose in a pure aqueous solution. For a technical juice or syrup, which also contains salts, invert sugar and other non-sugars, a °Bx reading estimates the total dissolved dry substance, not the sucrose content.
The same quantity may be written as “% dry substance by refractometer”. “°Bx” is what laboratories and instruments use, so the site keeps it as an input unit.
In the A-ENERGY calculators (apparent purity; evaporation and dilution) °Bx and “% dry substance” are two units for the same quantity. Enter all concentrations of one calculation in one unit, measured the same way.
Not to be confused with: Sucrose content (pol); true dry substance by drying; hydrometer (density) Brix — a different instrument and table.
Related: calculator «Apparent purity» · calculator «Evaporation and dilution» · Refractometric dry substance content (RDS) · Dry substance
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#Refractometric dry substance content (RDS)
In Ukrainian: Рефрактометричні сухі речовини (RDS)
Also: RDS, refractometric dry substance, °Bx
Basis: mass fraction of dissolved substances estimated from the refractive index; unit — % (or °Bx).
The parameter ICUMSA defines as dry substance content estimated from the refractive index of the solution using the SPS-3 tables. For pure sucrose solutions it is exact; for juices and syrups it depends on the non-sugar composition and is therefore an agreed industry approximation.
RDS is one of the two inputs of apparent purity: together with the pol of the same sample it gives the ratio used to judge juice quality.
In the A-ENERGY calculator (apparent purity) the field “Refractometric dry substance, °Bx” takes the reading for the same sample as pol, with no repeated temperature correction.
Not to be confused with: Dry substance as a general concept (everything except water); true dry substance by drying; sucrose content.
Related: calculator «Apparent purity» · Degree Brix (°Bx) · Dry substance · Apparent purity
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#Dry substance
In Ukrainian: Сухі речовини (СР)
Also: DS, dry matter, dry solids
Basis: % of product mass.
Everything left in a product after the water is removed: sucrose plus non-sugars. It is the general concept; by method one distinguishes true dry substance (by drying) from refractometric dry substance (by refractive index).
The dry-substance mass balance underlies evaporation calculations: water is evaporated while the mass of dry substance in the stream is taken as unchanged.
In the A-ENERGY calculator (evaporation and dilution) “% dry substance” is the concentration whose mass is held constant: m₁ × C₁ = m₂ × C₂. Losses and sucrose decomposition are not modelled.
Not to be confused with: °Bx and RDS are specific ways of estimating dry substance by refraction; sugar moisture (loss on drying) is the complement of dry substance to 100 %.
Related: calculator «Evaporation and dilution» · Degree Brix (°Bx) · Refractometric dry substance content (RDS) · Evaporation and dilution
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#Apparent purity
In Ukrainian: Видима чистота
Also: purity, juice purity, AP
Formula: apparent purity, % = 100 × pol / RDS (both values from the same sample).
The share of sucrose in the dry substance of a juice or syrup estimated from two routine parameters: polarimetric sucrose content (pol) and refractometric dry substance (RDS). The higher the purity, the fewer non-sugars interfere with crystallisation.
“Apparent” because both inputs are estimates: pol instead of true sucrose content, and a refractometer reading on a technical juice is an estimate of dissolved dry substance. True purity is the same ratio built on true sucrose (e.g. by chromatography) and true dry substance; it is determined less often and for other purposes.
In the A-ENERGY calculator apparent purity = 100 × pol / °Bx for the same sample; values above 100 % are shown without clipping, with a warning to check units, measurement basis and sample.
Not to be confused with: True purity; molasses purity (a separate object); sucrose content of molasses by mass of molasses — a different denominator.
Related: calculator «Apparent purity» · article «What’s on a Sugar Beet Technologist’s Desk: Standards, Handbooks and EU Benchmarks» · Polarimetric sucrose content (pol) · Refractometric dry substance content (RDS) · Sucrose content in molasses
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#Sugar content of beet
In Ukrainian: Цукристість буряків
Also: sugar content, sucrose content of beet, digestion
Denominator: beet mass; unit — % of root mass.
The share of root mass made up of sucrose, by laboratory polarimetric determination (factory jargon: “digestion”). Two beet lots of equal mass can contain different amounts of sucrose: 100 t at 16 % hold 16 t, at 18 % — 18 t.
Sugar content describes the raw material, not the output: how much sucrose ends up as white sugar also depends on non-sugars and on factory performance.
In the A-ENERGY calculator (white sugar yield) sugar content is optional: it only gives the mass of sucrose in the beet processed (beet × sugar content / 100) and is not used to forecast output.
Not to be confused with: White sugar yield (denominator — tonne of beet processed); beet yield (denominator — hectare); “sugar content” in industry glossaries may also mean total sugars or recoverable sugar.
Related: calculator «White sugar yield and sucrose in molasses» · article «From Beet to White Sugar: Why Harvest Tonnage Tells Only Part of the Story» · Actual white sugar yield · Beet yield · Polarimetric sucrose content (pol)
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#ICUMSA
In Ukrainian: ICUMSA
Also: International Commission for Uniform Methods of Sugar Analysis, ICUMSA Methods Book, ICUMSA units, IU
Name of the organisation; “ICUMSA units” (IU) are only one of its methods.
The International Commission for Uniform Methods of Sugar Analysis publishes harmonised methods of sugar analysis (the ICUMSA Methods Book) and SPS specifications, including those for polarimetry and refractometry. Methods are cited by group code and number, e.g. GS2-10, and by edition year.
In trade the word “ICUMSA” is often shorthand for colour in solution (“ICUMSA 45 sugar”). These are three different things: the organisation, a specific method and the unit of its result.
On the A-ENERGY site the category and quality parameters of a lot, including ICUMSA colour, are stated with the offer; in the calculators references to ICUMSA concern the pol and RDS definitions.
Not to be confused with: Colour units (IU); trade names such as “ICUMSA 45”; national standards that may refer to ICUMSA methods.
Related: calculator «Apparent purity» · article «What’s on a Sugar Beet Technologist’s Desk: Standards, Handbooks and EU Benchmarks» · Sugar solution colour (IU) · Polarimetric sucrose content (pol) · Refractometric dry substance content (RDS)
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#Sugar solution colour (IU)
In Ukrainian: Кольоровість цукру в розчині (IU)
Also: solution colour, colour in solution, ICUMSA units, IU, ICUMSA colour, ICUMSA
Unit: IU (ICUMSA units); a value is read together with the method and its edition.
Optical property of a sugar solution: absorbance of the filtered solution at 420 nm converted to ICUMSA units. The lower the number, the lighter the sugar. For white sugar up to 50 IU ICUMSA applies method GS2-10 (2024) — with no pH adjustment; for values of 20 IU and above the commission prefers method GS9-8.
A specification value without method and edition is not comparable: different methods (with or without pH adjustment, for different ranges) give different numbers for the same sample.
On the A-ENERGY site the colour of a lot is stated with the offer; the calculators do not compute it.
Not to be confused with: Colour type of crystals (Brunswick samples) is a different parameter; the points of Directive 2001/111/EC and the mapping of trade categories are outside this card; turbidity of the solution.
Related: article «What’s on a Sugar Beet Technologist’s Desk: Standards, Handbooks and EU Benchmarks» · ICUMSA
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