Ice Cream Wiki

Table sugar. The reference point for both PAC (1.0) and POD (1.0). Highly soluble, cheap, reliable. The backbone of most ice cream formulas. At high concentrations it can crystallize into a gritty texture (graininess), especially in sorbets.

Monosaccharide. Much higher PAC than sucrose due to its lower molecular weight, meaning it depresses the freezing point significantly more per gram. This makes the ice cream softer and easier to scoop from the freezer. Its lower sweetness (POD 0.7) means you can add more without oversweetening.

Replacing sucrose with dextrose softens the base and reduces sweetness. Commonly used in gelato to improve scoopability at −18 °C.

The sweetest naturally occurring sugar (POD 1.2–1.7, depending on temperature — sweeter when cold). High PAC. Absorbs water aggressively, which can make bases hygroscopic and sticky. Enhances fruit flavors. Speeds melt rate.

Use sparingly — too much fructose creates a sticky, quickly-melting product. Excellent in fruit sorbets where its hygroscopicity and flavor-enhancing properties shine.

Sucrose split (hydrolysed) into equal parts glucose and fructose. Retains moisture, resists re-crystallisation, and produces very fine ice crystals. Available as a thick syrup (≈75° Brix). Common in high-end gelato bases for its anti-crystallising effect on sucrose.

Partially hydrolysed starch. DE (Dextrose Equivalent) indicates how far hydrolysis has gone — higher DE means more sweetness and higher PAC. Low-DE syrups (DE30) add viscosity and body with minimal sweetness. High-DE syrups (DE60) behave more like dextrose. Excellent at inhibiting ice crystal growth.

Disaccharide found naturally in fungi and insects. Extremely low sweetness (POD 0.45). Protects proteins and flavors at low temperatures. Useful for reducing sweetness in high-PAC formulas without altering freezing behavior much.

Naturally present in milk (~4.5–5%). Low sweetness (POD 0.2), low PAC (0.8). The main concern is crystallisation at high concentrations — lactose crystals are perceived as sandiness. MSNF concentration should be managed to stay below the crystallisation threshold (~8–11% lactose in the water phase).

Brix (°Bx) is a measure of dissolved solids in a liquid — primarily sugars — expressed as grams of sucrose per 100 g of solution. 1 °Bx ≈ 1% sugar by weight. Measured with a refractometer (optical) or densitometer. A quick, reliable field check for sugar balance without running full PAC/POD calculations.

Not all dissolved solids are sugars — acids, proteins, and minerals also register on a refractometer, so Brix is an approximation. In practice, for sugar syrups and fruit purées it is accurate enough to be the primary balance tool.

Brix tells you total dissolved solids, not sweetness. A high-Brix sorbet built with dextrose will taste much less sweet than the same Brix built with fructose. Always cross-check Brix with POD and PAC calculations rather than relying on it alone.

Brix ≈ POD% only when all sugar in the mix is sucrose (POD coeff 1.0). In that case the POD formula reduces to sugar weight / total mix weight × 100 — the same thing Brix measures — so the numbers match. As soon as you mix in other sugars they diverge: 100 g dextrose in 1 kg of mix reads ~10 °Bx but contributes only ~7% POD (coeff 0.7), while 100 g fructose reads the same ~10 °Bx but contributes ~17% POD (coeff 1.7). A refractometer confirms your total sugar fraction but not your sweetness or freezing behaviour.

PAC (Potere AntiCongelante) measures a sugar's ability to depress the freezing point and inhibit ice crystal growth, relative to sucrose. A higher PAC means more freezing point depression per gram — the mix stays softer and more scoopable at a given storage temperature.

PAC is a colligative property — it depends on the number of dissolved molecules, not their type. Smaller molecules (monosaccharides like dextrose) have more molecules per gram than larger ones (sucrose, glucose syrup), so they depress the freezing point more aggressively.

PAC% is calculated as: Σ(ingredient weight × PAC coefficient) / total mix weight × 100. Each ingredient contributes proportionally to the total PAC of the mix.

POD (Potere Dolcificante) measures perceived sweetness relative to sucrose. A sucrose solution at any concentration is the reference (1.0). POD is not a colligative property — it reflects how our taste receptors respond to different sugar molecules.

Unlike PAC, POD is somewhat temperature-dependent: fructose tastes sweeter cold than warm, which is why cold sorbet can taste more intensely sweet than the same syrup at room temperature.

Cold suppresses sweetness perception. A base that tastes perfectly sweet at room temperature will taste noticeably less sweet from the freezer. Calibrate POD slightly above your target when tasting warm.

FPD is a derived estimate of how many degrees Celsius the mix's freezing point is depressed below 0 °C. It is calculated directly from PAC:

FPD (°C) = PAC% × 3.7 / 100

A higher FPD means the mix stays liquid to a lower temperature — more of the water remains unfrozen at serving temperature, giving a softer, creamier scoop. The ideal range depends on serving temperature.

FPD is an approximation — it assumes all sugars behave like sucrose. Real mixes also contain salts, acids, and proteins that contribute slightly to freezing point depression, so actual FPD is marginally lower (more negative) than the formula suggests.

PAC and POD are often in tension. Increasing PAC (for a softer product) can easily overshoot the sweetness target if you add more sucrose. The solution is to use sugar blends where different sugars contribute differently to each axis.

A good starting point for gelato: 60–70% sucrose, 20–30% dextrose, 5–10% glucose syrup. Adjust from there by tracking PAC and POD against your target ranges.

During churning, fat globules partially coalesce around air bubbles, forming a network that stabilises the foam. This is called fat destabilisation — a controlled, desirable process. Without sufficient fat, air bubbles collapse and the texture becomes icy and dense. Too much fat can result in a greasy, heavy mouthfeel.

Fat does not depress the freezing point — it is insoluble in the aqueous phase and does not contribute to PAC or FPD.

Heavy cream (35–40% fat) is the standard fat source for ice cream. Milk provides a lower-fat alternative (~3.5%) alongside MSNF. Butter can concentrate fat further. Fat from cream contributes rich dairy flavor through fat-soluble volatile compounds.

Egg yolks contain ~30% fat and ~8% lecithin, a natural emulsifier. They enrich flavor, deepen color, and improve emulsification. Pasteurisation (cooking the base) denatures yolk proteins, contributing to body. Custard-style bases use 3–6 yolks per litre.

Egg yolk lecithin improves fat dispersion and delays fat destabilisation during churning, allowing higher overrun.

Coconut cream/fat (~22–28% fat) is the standard non-dairy fat source. High in saturated fat — similar partial coalescence behaviour to dairy. Contributes a distinct coconut flavor, which can be desirable or masked depending on the recipe. Coconut oil (100% fat) is sometimes added in small amounts to boost fat percentage.

Without fat to soften texture, sorbets rely on PAC-balanced sugar blends. A Brix reading of 28–32° in the final mix is typical. Higher Brix = softer but sweeter. Lower Brix = icier and harder. Mixing sucrose with dextrose or glucose syrup allows you to hit the Brix target while softening the freeze.

Inulin is a soluble dietary fiber (fructo-oligosaccharide) derived from chicory root. In sorbets, it mimics the mouthfeel of fat — adding creaminess, body, and a clean finish. It has very low sweetness (POD ~0.1) and does not ferment to produce off-flavors at typical sorbet doses.

Inulin forms a gel-like network when hydrated, contributing a noticeable body improvement in low-fat or fat-free products.

Many fruits naturally contain pectin, which provides some structure in fruit sorbets at no cost. High-pectin fruits (citrus pith, quince, apple) contribute measurable viscosity to a sorbet base. This is part of why citrus-based sorbets often have better body than, say, strawberry.

Without fat and proteins to buffer ice crystal growth, sorbets need stabilizers even more than ice cream. Common choices:

• LBG + Guar blend — synergistic, improves body and slows recrystallisation
• Xanthan gum — strong at very low doses, keeps sorbet smooth after temperature fluctuation
• Pectin (HM or LM) — natural, works well with acidic fruit bases
• CMC — good water-holding, cost-effective

Stabilizers should be dispersed in a portion of the sugar before adding to liquid, to prevent clumping.

Derived from carob seeds (Ceratonia siliqua). Requires heating to ~85 °C to fully hydrate. The benchmark stabilizer in premium gelato — strongly inhibits ice crystal growth and recrystallisation. Strongly synergistic with carrageenan and xanthan.

If LBG isn't fully hydrated, it leaves undissolved specs and reduced effectiveness. Always heat the mix past 80 °C when using LBG.

From guar beans (Cyamopsis tetragonoloba). Hydrates in cold water — no heating required. Provides thickening at twice the concentration needed for LBG. Less effective at preventing recrystallisation than LBG. Often blended with LBG to reduce cost while maintaining cold-hydration capability.

Produced by fermentation (Xanthomonas campestris). Extremely high viscosity at very low concentrations. Pseudoplastic (shear-thinning) — feels thin when eaten, thick when still. Excellent for sorbets and non-dairy applications. Synergistic with LBG and guar.

Overuse gives a slimy mouthfeel. Start conservatively — 0.03% is often enough when paired with other hydrocolloids.

Extracted from red seaweed (Kappaphycus alvarezii). Forms a firm, brittle gel in the presence of potassium ions (K⁺) and interacts with κ-casein micelles in dairy — strengthening the network and improving body. Strongly synergistic with LBG; together they produce a smoother, more elastic gel than either alone. Used at very low doses. Largely ineffective in non-dairy mixes with no casein.

The synergy with LBG is the main reason commercial ice cream blends use both together — LBG converts the brittle kappa gel into a softer, more elastic, cohesive texture.

Extracted from Eucheuma denticulatum. Forms a soft, elastic, thixotropic gel in the presence of calcium ions (Ca²⁺). Unlike kappa, the iota gel does not synerese (weep liquid) and reforms after shearing — making it well suited to frozen applications where freeze-thaw stability matters. Less brittle than kappa, milder dairy interaction.

Iota is less common in standard ice cream but useful in products with higher calcium content (yogurt-based, calcium-fortified) or where you want a stable, non-syneresing gel with good freeze-thaw resilience.

Unlike kappa and iota, lambda carrageenan does not form a gel. It is a non-gelling thickener and viscosity builder that is effective in both hot and cold water without ions. This makes it uniquely useful in ice cream: it thickens the liquid mix at all temperatures and contributes a rich, custardy mouthfeel to the melted product, without adding gel structure that could make the frozen texture gummy.

Lambda is the carrageenan of choice in artisan ice cream blends (like the Underbelly general-purpose formula) because it enriches the melt without stiffening the frozen body. If the melted ice cream feels thin or watery, a small addition of lambda is the targeted fix.

A modified cellulose derivative. Excellent at binding free water and preventing ice crystal growth. Provides a clean, neutral mouthfeel. Often used as a cost-effective component in stabilizer blends for bulk ice cream. Cold-soluble.

Extracted from apple or citrus peel. High-Methoxyl (HM) pectin gels in acidic, high-sugar environments (ideal for fruit sorbets). Low-Methoxyl (LM) pectin gels with calcium ions — useful in low-sugar or dairy applications. Contributes a clean, fruity texture.

Animal-derived protein (collagen hydrolysate). Forms a heat-reversible gel that melts at body temperature — contributing a smooth, slow-melt sensation. One of the oldest ice cream stabilizers. Not suitable for vegetarian/vegan products.

From the tara plant (Caesalpinia spinosa). Similar galactomannan structure to LBG but with a higher mannose-to-galactose ratio. More neutral flavor than LBG. Slightly more soluble at lower temperatures. A premium LBG substitute.

Gelatin hydrates when cooked to 60 °C — any standard cooking step handles this. Both suppress ice crystals and increase viscosity.

The gelatin forms a weak gel that melts at body temperature and strengthens in the cold, so its effect is most pronounced in the frozen state. Xanthan's activity is nearly temperature-independent — its effect is most pronounced in the melted state.

• More gelatin → more body in the frozen product
• More xanthan → creamier melt

At much higher concentrations xanthan goes from creamy to slimy. If this blend at modest doses isn't giving results, move to a gum-based blend rather than increasing xanthan.

Must be cooked past the hydration temperature of LBG (most brands need 80–85 °C; some specialist gums hydrate at 74 °C).

• LBG — most powerful ice crystal suppression; subtle body and melt creaminess
• Guar — amplifies LBG; strongest effect on frozen body. Too much → chewy, elastic texture
• λ-Carrageenan — enriches the melt with a custardy character. If the melt feels thin, add a little more here

Use at 0.1% for rich custard bases. Go up to 0.25% for lighter mixes or those needing longer shelf life. Source: Underbelly.

Same as Blend 2, but with guar and carrageenan increased to compensate for the loss of egg yolk's thickening and stabilising proteins. Lecithin (1 g ≈ 1 large yolk) replaces the emulsification role of the yolk.

Don't over-add lecithin — too much will actually impede whipping and reduce overrun. Source: Underbelly.

Requires no cooking — cold hydration. Blend dry into the fruit purée, chill, then spin. No separate syrup needed.

• CMC — star ingredient for sorbets. Strong ice crystal suppression, cold-soluble, clean mouthfeel
• Guar — adds body and elasticity, amplifies CMC
• λ-Carrageenan — enriches the melted texture

For sorbets with fat (chocolate, nut butters, olive oil), add ~1 g/L lecithin for smoother emulsification. Source: Underbelly.

A dairy-focused gelato blend. The κ-carrageenan interacts directly with casein proteins to strengthen body, while LBG + Guar provide the primary ice crystal control. The kappa-LBG synergy produces a smoother, more elastic gel than either alone.

A minimal cold-process sorbet stabiliser. CMC handles ice crystal suppression and water binding; guar adds body and amplifies the CMC effect. Cold-soluble — no cooking required, blend directly into the base.

Present naturally in egg yolk (8–10%) and soy/sunflower. Phospholipid structure with both hydrophilic and lipophilic ends. Promotes fat dispersion and delays fat destabilisation. Soy lecithin is the most common commercial form — it's also an antioxidant.

Partial glycerides of fatty acids, derived from vegetable or animal fat. Promote fat destabilisation during freezing — they displace proteins from fat globule surfaces, enabling partial coalescence. This gives better overrun, a dryer texture, and improved shape retention. Standard in commercial American-style ice cream.

Synthetic emulsifier (polyoxyethylene sorbitan mono-oleate). Very effective at promoting fat destabilisation and maximising overrun. Commonly combined with MDG. A staple of commercial soft-serve and bulk ice cream. Less common in artisanal/premium gelato.

Fresh milk has a pH of ~6.6–6.8. Ice cream bases are typically pH 6.2–6.8. Casein micelles are stable in this range. If pH drops below ~5.5, casein proteins begin to destabilise. At the isoelectric point of casein (~pH 4.6), proteins precipitate entirely — this is what makes yogurt and soft cheese firm.

Adding acid directly to a hot dairy base risks curdling. Always add acid to cooled bases, and never exceed small amounts without testing first.

The most common food acid. Triprotic — provides a sharp, bright acidity. Naturally present in citrus fruits. Used to acidify sorbets, boost citrus flavor, inhibit enzymatic browning, and extend shelf life. Dissolves readily in water.

Found naturally in apples and many stone fruits. Diprotic acid. Softer onset than citric — the sourness builds more slowly and lingers longer. Excellent in apple, pear, cherry, and stone fruit sorbets. Commonly blended with citric for a more complex acidity.

Characteristic acid of grapes and wine. Diprotic. Provides a firm, persistent sourness with an almost astringent edge. Used in grape and wine-flavoured sorbets, and occasionally in combinations for complexity.

Naturally produced in fermented dairy (yogurt, buttermilk) and fermented fruits. Mono-protic. Very mild, rounded acidity — almost dairy-adjacent in character. Less common as an additive but relevant in cultured cream or yogurt-based ice creams. Also used as a pH adjustor in small amounts.

pH strongly affects how stabilizers behave:

• HM Pectin only gels below pH 3.5 in high-sugar environments
• Carrageenan degrades faster at low pH — avoid in acidic (pH < 4) applications
• Gelatin weakens at low pH — less effective in acidic sorbets
• LBG, Guar, Xanthan are generally stable across pH 3–9

Cold temperature suppresses the perception of sourness. A sorbet that tastes perfectly balanced at room temperature will taste noticeably less sharp from the freezer. As a rule, sorbet bases should taste slightly more acidic than you'd want in the final product. The same principle applies — mildly — to sweetness and most other flavors.

Overrun % = (volume out − volume in) / volume in × 100. A mix that doubles in volume has 100% overrun. Commercial ice cream often exceeds 100% by legal minimum; premium gelato targets 20–35%. Higher overrun = lower density = lighter, cheaper product.

Air incorporation is stabilised by the fat network built during churning. Higher fat and effective emulsifiers (MDG, PS80) allow more air to be trapped. Stabilizers prevent the air cells from collapsing during hardening. Low-fat or non-dairy bases typically have lower maximum overrun.

• Higher fat % → better foam stabilisation
• MDG / PS80 → promotes fat destabilisation → better foam scaffold
• Optimal churning speed and temperature
• Stabilizer blend that holds structure during hardening

High-overrun products melt faster because air provides less thermal insulation than a dense mix. Premium gelato, with its low overrun and dense structure, melts more slowly — which is partly why gelato is served at a higher temperature (−10 to −12 °C vs −18 °C for hardened ice cream).