I. Causes of Oil Separation
Insufficient addition of lean meatAfter grinding and tumbling, meat releases a large amount of salt-soluble proteins under the action of salt and phosphate. Salt-soluble proteins have a strong fat-encapsulating capacity. If the meat content in the product is relatively low, its ability to encapsulate fat will decrease, eventually leading to oil separation.
Excessively high fat contentTo reduce costs, many manufacturers continuously increase the fat content. Even when salt-soluble proteins fully function, part of the fat still cannot be encapsulated, resulting in excess fat and subsequent oil separation.
Insufficient addition of concentrated protein and isolated proteinBoth concentrated protein and isolated protein possess excellent oil and water retention properties. As mentioned above, despite their full functionality, some fat still cannot be encapsulated when a large amount of fat is added, leading to oil separation.
Selection of auxiliary ingredients not focused on oil retentionManufacturers usually add appropriate thickeners, fillers and other auxiliary ingredients to products, yet different thickeners and fillers vary in oil retention performance. Therefore, choosing auxiliary ingredients with good oil retention can effectively alleviate oil separation.
Unreasonable partial processing techniquesDetails and sequences in production significantly affect the oil retention performance of products. Negligence in processing order and details prevents oil-retentive raw and auxiliary materials from exerting their maximum effect, which requires special attention from production technicians.
II. Corresponding Solutions
1. Material Selection
(1) Main raw material selectionOn the premise of cost control, select a reasonable lean-to-fat ratio of raw meat. It is recommended to use chicken breast as lean meat and chicken skin or duck skin as fat. Chicken breast features low inherent fat content, and its tissue structure and chemical composition make the finished product more elastic than pork or beef products, with a lower cost. Chicken skin and duck skin are chosen for the same reasons.
(2) Auxiliary ingredient selectiona. Soy protein concentrate and soy protein isolate:Both have strong oil and water retention properties. Proper addition during processing greatly improves the product’s oil retention, as well as its elasticity and yield. High-quality soy protein concentrate is preferred.
b. Phosphate:As an indispensable quality improver in meat processing, phosphate promotes the release of salt-soluble proteins, enhances water retention, stabilizes fat emulsification, facilitates the function of concentrated protein, and chelates metal ions. Selecting appropriate phosphate and adding it in proper amounts actively prevents oil separation. High-quality compound phosphate, formulated from premium phosphate monomers via scientific compounding, delivers excellent oil and water retention and is critical to product quality.
c. Thickeners:Carrageenan is commonly used as a thickener, but many other thickeners (e.g., guar gum, flaxseed gum) exhibit far better oil retention than carrageenan. It is recommended to partially replace or supplement with flaxseed gum or guar gum to improve oil retention.
2. Supporting Processing Techniques
(1) Meat grindingGrind raw meat into appropriately sized particles. Ensure uniform, distinct meat grains without paste formation, and control grinding temperature. For fat grinding, keep particles as small as possible while maintaining clear grain structure, as oversized particles impair oil retention.
(2) TumblingDetermine reasonable tumbling time and speed based on meat particle size. Phosphate must be fully dissolved before addition. Proper addition of auxiliary ingredients and tumbling maximize the release of salt-soluble proteins, greatly boosting oil retention.
(3) CuringCuring is essential in Taiwanese grilled sausage production (mainly for fat). Curing fat with salt and sugar prevents oil molecules from dissociating during subsequent heating, aiding oil retention while improving overall flavor and texture.
(4) MixingThis step precedes fat incorporation into meat paste. Add a highly oil-retentive thickener to fat, mix evenly, and let stand for about 0.5 hours before blending into the meat paste, followed by adding other auxiliary ingredients for casing.
3. Application of Emulsified Oil Retention Agent
If oil separation persists after the above measures, the product’s fat content is excessively high, making it impossible for inherent salt-soluble proteins, concentrated/isolated protein, and high-performance thickeners to fully encapsulate fat. An emulsified oil retention agent is required.
(1) Select an appropriate amount of fatAs other raw and auxiliary materials retain part of the fat, only a portion of fat needs to be treated with the emulsified oil retention agent.
(2) Proper ratioEmulsified oil retention agent : fat : water = 1 : 20 : 20
(3) Application stepsFirst, add water and emulsified oil retention agent to a high-speed chopper and chop at low speed for 1–2 minutes, then at high speed for 1–2 minutes to form a uniform, fine emulsion. Add ground fat, chop at low speed for 1–2 minutes, then at high speed for 2–3 minutes to obtain a smooth, glossy emulsified system. Let it stand until curing is complete, then mix with starch, spices and other ingredients.
The emulsified system prepared this way shows no oil separation after steaming at 100℃ for 30 minutes, proving excellent oil retention and suitability for preventing oil separation in Taiwanese grilled sausages.
Insufficient addition of lean meatAfter grinding and tumbling, meat releases a large amount of salt-soluble proteins under the action of salt and phosphate. Salt-soluble proteins have a strong fat-encapsulating capacity. If the meat content in the product is relatively low, its ability to encapsulate fat will decrease, eventually leading to oil separation.
Excessively high fat contentTo reduce costs, many manufacturers continuously increase the fat content. Even when salt-soluble proteins fully function, part of the fat still cannot be encapsulated, resulting in excess fat and subsequent oil separation.
Insufficient addition of concentrated protein and isolated proteinBoth concentrated protein and isolated protein possess excellent oil and water retention properties. As mentioned above, despite their full functionality, some fat still cannot be encapsulated when a large amount of fat is added, leading to oil separation.
Selection of auxiliary ingredients not focused on oil retentionManufacturers usually add appropriate thickeners, fillers and other auxiliary ingredients to products, yet different thickeners and fillers vary in oil retention performance. Therefore, choosing auxiliary ingredients with good oil retention can effectively alleviate oil separation.
Unreasonable partial processing techniquesDetails and sequences in production significantly affect the oil retention performance of products. Negligence in processing order and details prevents oil-retentive raw and auxiliary materials from exerting their maximum effect, which requires special attention from production technicians.
II. Corresponding Solutions
1. Material Selection
(1) Main raw material selectionOn the premise of cost control, select a reasonable lean-to-fat ratio of raw meat. It is recommended to use chicken breast as lean meat and chicken skin or duck skin as fat. Chicken breast features low inherent fat content, and its tissue structure and chemical composition make the finished product more elastic than pork or beef products, with a lower cost. Chicken skin and duck skin are chosen for the same reasons.
(2) Auxiliary ingredient selectiona. Soy protein concentrate and soy protein isolate:Both have strong oil and water retention properties. Proper addition during processing greatly improves the product’s oil retention, as well as its elasticity and yield. High-quality soy protein concentrate is preferred.
b. Phosphate:As an indispensable quality improver in meat processing, phosphate promotes the release of salt-soluble proteins, enhances water retention, stabilizes fat emulsification, facilitates the function of concentrated protein, and chelates metal ions. Selecting appropriate phosphate and adding it in proper amounts actively prevents oil separation. High-quality compound phosphate, formulated from premium phosphate monomers via scientific compounding, delivers excellent oil and water retention and is critical to product quality.
c. Thickeners:Carrageenan is commonly used as a thickener, but many other thickeners (e.g., guar gum, flaxseed gum) exhibit far better oil retention than carrageenan. It is recommended to partially replace or supplement with flaxseed gum or guar gum to improve oil retention.
2. Supporting Processing Techniques
(1) Meat grindingGrind raw meat into appropriately sized particles. Ensure uniform, distinct meat grains without paste formation, and control grinding temperature. For fat grinding, keep particles as small as possible while maintaining clear grain structure, as oversized particles impair oil retention.
(2) TumblingDetermine reasonable tumbling time and speed based on meat particle size. Phosphate must be fully dissolved before addition. Proper addition of auxiliary ingredients and tumbling maximize the release of salt-soluble proteins, greatly boosting oil retention.
(3) CuringCuring is essential in Taiwanese grilled sausage production (mainly for fat). Curing fat with salt and sugar prevents oil molecules from dissociating during subsequent heating, aiding oil retention while improving overall flavor and texture.
(4) MixingThis step precedes fat incorporation into meat paste. Add a highly oil-retentive thickener to fat, mix evenly, and let stand for about 0.5 hours before blending into the meat paste, followed by adding other auxiliary ingredients for casing.
3. Application of Emulsified Oil Retention Agent
If oil separation persists after the above measures, the product’s fat content is excessively high, making it impossible for inherent salt-soluble proteins, concentrated/isolated protein, and high-performance thickeners to fully encapsulate fat. An emulsified oil retention agent is required.
(1) Select an appropriate amount of fatAs other raw and auxiliary materials retain part of the fat, only a portion of fat needs to be treated with the emulsified oil retention agent.
(2) Proper ratioEmulsified oil retention agent : fat : water = 1 : 20 : 20
(3) Application stepsFirst, add water and emulsified oil retention agent to a high-speed chopper and chop at low speed for 1–2 minutes, then at high speed for 1–2 minutes to form a uniform, fine emulsion. Add ground fat, chop at low speed for 1–2 minutes, then at high speed for 2–3 minutes to obtain a smooth, glossy emulsified system. Let it stand until curing is complete, then mix with starch, spices and other ingredients.
The emulsified system prepared this way shows no oil separation after steaming at 100℃ for 30 minutes, proving excellent oil retention and suitability for preventing oil separation in Taiwanese grilled sausages.
