Enzymes

Enzymes are biological catalysts that modify food at the molecular level. In frozen desserts, they clarify juices, reduce sweetness, improve texture, and create unique effects.

Enzyme Fundamentals

Key Properties

Factor	Effect
Temperature	Each enzyme has optimal range; too hot denatures
pH	Affects activity; extremes can deactivate
Time	Longer exposure = more complete reaction
Concentration	Higher dose = faster reaction

Deactivation

Most enzymes are deactivated by heating above 70–80°C / 158–176°F for several minutes.

---

Pectinase (Pectinex)

Breaks down pectin in fruit, releasing juice and clarifying.

Applications

Use	Effect
Juice extraction	Higher yield from fruit
Clarification	Removes cloudiness
Texture modification	Prevents gelling in high-pectin fruits

Dosage

Component	Amount
Fruit purée or mash	1000g
Pectinase (Pectinex Ultra SP-L)	1–2ml (0.1–0.2%)

Apple Juice Clarification

Component	1x	2x
Fresh apple juice (cloudy)	1000g (4 c)	2000g (8 c)
Pectinase	1.5ml	3ml

Method

1. Warm juice: Heat to 45–50°C / 113–122°F—optimal enzyme activity.

2. Add enzyme: Stir in pectinase thoroughly.

3. Incubate: Hold at 45–50°C for 1–2 hrs, or room temperature for 4–8 hrs.

4. Observe: Juice clarifies as pectin breaks down; solids settle.

5. Decant or filter: Pour off clear juice; filter if needed.

6. Deactivate: Heat to 80°C / 176°F for 5 min to stop enzyme activity.

Result: Crystal-clear juice with increased yield (~10–20% more).

Note

Pectinase works best on raw fruit. Cooked fruit has denatured pectin that’s harder to break down.

---

Lactase

Breaks lactose into glucose and galactose—makes dairy sweeter and digestible for lactose-intolerant.

Applications

Use	Effect
Sweetness boost	Same lactose, perceived sweeter
Lactose-free products	For intolerant customers
Texture improvement	Reduced lactose crystallization

Dosage

Component	Amount
Milk or cream	1000g
Lactase drops	5–10 drops (varies by brand)

Lactose-Free Ice Cream Base

Component	1x	2x
Whole milk	500g (2 c)	1000g (4 c)
Heavy cream	350g (1½ c)	700g (3 c)
Lactase drops	8 drops	16 drops
Granulated sugar	130g	260g
Egg yolks	100g (5)	200g (10)
Vanilla	5g	10g
Salt	2g	4g

Method

1. Treat dairy first: Combine milk and cream. Add lactase drops. Stir.

2. Incubate: Refrigerate 24 hrs. Enzyme works slowly at cold temps.

3. Proceed with base: Use treated dairy for standard custard method.

4. Adjust sugar: Lactase-treated dairy tastes sweeter. Reduce sugar by 15–20% if desired.

Note

The 24-hr treatment converts ~99% of lactose. Longer treatment doesn’t significantly improve results.

---

Transglutaminase (Meat Glue)

Bonds proteins together. Limited frozen dessert applications but useful for specific effects.

Applications

Use	Effect
Protein binding	Joins dairy proteins
Texture modification	Creates unique gel structures
Milk setting	Forms protein gel without heat

Dosage

Component	Amount
Protein-containing liquid	1000g
Transglutaminase (Activa RM)	5–10g (0.5–1.0%)

Milk Gel

Component	1x	2x
Whole milk	500g (2 c)	1000g (4 c)
Transglutaminase	5g	10g

Method

1. Warm milk: Heat to 50°C / 122°F.

2. Disperse enzyme: Whisk transglutaminase into warm milk.

3. Incubate: Hold at 50°C for 2 hrs, or refrigerate overnight.

4. Result: Milk sets into soft, sliceable gel.

5. Deactivate: Heat above 75°C / 167°F to stop activity.

Caution

Transglutaminase should not be inhaled. Use in well-ventilated areas. Wear mask when handling powder.

---

Invertase

Converts sucrose to glucose and fructose (invert sugar). Increases sweetness and affects freezing point.

Applications

Use	Effect
Texture softening	Lower freezing point
Sweetness increase	Fructose is sweeter than sucrose
Crystallization prevention	Invert sugar resists crystallization

Dosage

Component	Amount
Sugar syrup	1000g
Invertase	0.5–1g (0.05–0.1%)

Inverted Simple Syrup

Component	1x	2x
Granulated sugar	500g	1000g
Water	500g (2 c)	1000g (4 c)
Invertase	0.5g	1g
Citric acid	1g	2g

Method

1. Make syrup: Dissolve sugar in water. Add citric acid (lowers pH, helps inversion).

2. Cool: Let syrup cool to 60°C / 140°F.

3. Add enzyme: Stir in invertase.

4. Incubate: Hold at 55–60°C for 2–4 hrs, or room temperature for 24–48 hrs.

5. Test: Invert sugar is complete when syrup won’t crystallize even when supersaturated.

6. Use: Replaces corn syrup in recipes; adjust for increased sweetness.

---

Amylase

Breaks down starches into sugars. Useful for grain-based bases.

Applications

Use	Effect
Starch liquefaction	Converts starch to sugars
Sweetness development	Creates natural sweetness from grains
Texture modification	Reduces starchy mouthfeel

Sweet Rice Base

Component	1x	2x
Cooked rice	300g	600g
Water	500g (2 c)	1000g (4 c)
Amylase	1g	2g

Method

1. Blend: Purée rice with water until smooth.

2. Warm: Heat to 65°C / 149°F.

3. Add enzyme: Stir in amylase.

4. Incubate: Hold at 65°C for 1–2 hrs. Mixture thins and sweetens.

5. Deactivate: Heat to 85°C / 185°F for 5 min.

6. Strain: Pass through fine mesh.

7. Use: As base for rice gelato or as sweetener.

---

Enzyme Activity Chart

Enzyme	Optimal Temp	Optimal pH	Deactivation Temp
Pectinase	45–55°C	3.5–5.0	80°C+
Lactase	35–40°C	6.0–7.0	70°C+
Transglutaminase	50–55°C	5.0–8.0	75°C+
Invertase	55–60°C	4.5–5.5	70°C+
Amylase	60–70°C	5.5–7.0	85°C+

---

Sourcing

Enzyme	Common Brands	Source
Pectinase	Pectinex Ultra SP-L	Modernist Pantry, Amazon
Lactase	Lactaid drops, various	Pharmacy, Amazon
Transglutaminase	Activa RM, TI	Modernist Pantry
Invertase	Various	Baking suppliers, Amazon
Amylase	SEBAmyl, various	Brewing suppliers

---

Troubleshooting

Issue	Cause	Fix
No enzyme activity	Temperature too high/low	Check optimal range
Incomplete reaction	Insufficient time	Extend incubation
Off-flavors	Enzyme contamination or overdose	Use correct dosage; quality source
Texture problems	Over-treatment	Reduce time or concentration
Still cloudy after pectinase	pH wrong or pectin type incompatible	Adjust pH; try different enzyme
Dairy still causes issues	Incomplete lactose conversion	Extend treatment to 48 hrs

---

Safety Notes

Enzyme	Handling Notes
Pectinase	Generally safe; wash hands after
Lactase	Food-safe; no special precautions
Transglutaminase	Avoid inhalation; use mask and ventilation
Invertase	Generally safe
Amylase	Generally safe; avoid inhalation

Note

All enzymes should be stored according to manufacturer instructions—typically refrigerated. Check expiration dates; enzyme activity decreases over time.