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Functionalities of Food Additives and
Enzymes in Muscle Foods: A
Technological Perspective
Youling L. Xiong, PhD, ProfessorFellow of IFT, ACS AGFD, IAFoST
Scientific Editor, Journal of Food Science
Department of Animal and Food Sciences
University of Kentucky
Bertebos Conference on Food
Additives and Enzymes
August 29-30, 2016
Falkenberg, Sweden
Food additive (FDA):
“Any substance that is reasonably expected to become a component of food.”
Production, processing, treatment, packaging, transportation or storage of food.
Excludes GRAS ingredients
Purposes1) To maintain or improve safety and freshness
2) To improve or maintain nutritional value
3) To improve taste, texture and appearance
4) To aid in processing
“Additive” vs. “Ingredient”
Difference is mainly in the quantity used in any given formulation
Food additives are minor ingredients incorporated into foods to affect their properties
Additives:Key to the success of processed meats
Flavor
Color (appearance)
Texture
Mouthfeel
Products yield (water-binding)
Product stability and shelf-life (antioxidant)
Variety of products
Food safety
In the U.S. meat industry,
Brand Name!
Beef pastrami
Salami
Roast beef
Ingredients/Materials
1. Meat materials
2. Salt
3. Phosphates
4. Sweeteners
5. Alkalis/acids
6. Antioxidants
7. Nitrite/nitrate
8. Binders
9. Flavorings/seasoning
10. Casings
11. Enzymes
12. Antimicrobials
“functional”
Meat Products
QualitySafety
Organoleptic Nutritive/health
Color Texture Juiciness StabilityFlavor
Ingredients
processing
Animal Production
Feed additives
Meat Ingredients/Additives
1. Meat quality
“Micro” molecular chemicals
• Salts
• Phosphates
• Nitrite
• Antioxidants (ascorbate, tocopherols, BHA…)
• Antimicrobials
“Macro” molecular chemicals
• Non-muscle proteins
• Protein hydrolysates
• Enzymes
• Polysaccharides
Meat Ingredients/Additives
2. Meat safety
① Organic acids Citric, lactic, malic, benzoic acid
② Salt of organic acids Sodium lactate, diacetate, citrate,
③ Bacteriocins Nisin, pediocin
④ Acidified sodium chlorite
⑤ Lauric Arginate
⑥ Lactoferrin
⑦ Spices/herbs
Antimicrobials
1. Salts
Monovalent chlorides NaCl, KCl, LiCl
Divalent cations CaCl2, MgCl2
Salts (e.g., NaCl)
Main function is to solubilize/extract myofibrillar
proteins
Solubility gelation, emulsification, meat binding, water
holding… texture, tenderness, juiciness, product
stability….
Critical concentration (without phosphate): ~2% NaCl
(0.5 M)
Fat
Protein membrane
(NaCl, mol/l)
0.0001 0.001 0.01 0.1 1 10
So
lub
ilit
y (
%)
0
20
40
60
80
100
Extensively washedhighly diluted
Fresh meat
Salted meat
Xiong, Y.L. 2004. Encyclopedia of Meat Sciences, Jensen, W.K., Devine, C., and
Dikeman, M. (Eds.), pp. 218-225. Elsevier, Oxford, UK.
NaCl
Fresh meat
Salted meat (2% NaCl)
─NH3+
Cl-─NH3
+
Cl-
Cl-
Cl-
─NH3+/Cl-
─NH3+/─COO-
─NH3+
─COO-
Wate
r B
ind
ing
4.0 4.5 5.0 5.5 6.0
pH of Meat
─NH3+
+
+
__
0
0
Xiong, Y.L. 2004. Encyclopedia of Meat Sciences, Jensen, W.K., Devine, C., and Dikeman, M.
(Eds.), pp. 218-225. Elsevier, Oxford, UK.
H
H
O d–d+
KCl LiCl CaCl2 MgCl2 Salt substitute blend
• KCl/K-lactate/glycine• NaCl/KCl/CaCl2• KCl/tartaric acid/citric acid/sucrose• Transglutaminase/caseinate/KCl/dietary fiber• NaCl/KCl/MgSO4/lysine HCl
Replacement of all or part of NaClwith other chloride salts
Flavor enhancersIMP Yeast extractMSG Protein hydrolysates
Masking agentsNeutraFresSaltTrim
What About Flavor?
“Umami”
Salt replacers:Calcium chloride Magnesium chlorideMagnesium sulphatePotassium chloridePotassium iodine (Iodized salt)
Salt taste enhancers:L-ArginineCalcium diglutamateDipotassium inosinate Inosine monophosphate LactatePotassium guanylate L-lysine Mono potassium glutamate ThrehaloseL-ornithineDried bonito aroma extract(not heated)
Options of Taste
Sulfur-containing compounds, pyrazines,
alcohols, and phenols
2. Phosphates
Myofibrils
Muscle Proteins
Swelling
DissolutionAggregation
Denaturation
Gel network
Product texture,
WHC, fat binding
Phosphates Processing factors:
pH, salt, other ingredients
time, temperature
Phosphates
&
Processing
factors
Hydration
Water binding
Juiciness,
tenderness
① Extract protein
② Increase water holding
Salt
Phos
High
LowXiong, Y.L. 1999. Quality Attributes of Muscle Foods, pp. 319-334.
Kluwer Academic/Plenum Publishers, New York.
Types of phosphate
0.2–0.5%
Mono: Orthophosphate, P (1, 2, 3 Na+)
Di: Pyrophosphate, PP (1, 2, 3, 4 Na+)
Tri: Tripolyphosphate, TPP (1, 2, 3, 4, 5 Na+)
Meta: Hexametaphosphate, HMP
P
O
O
O
O P
O
O
O
O P
O
O
O
P
O
O
O
O P
O
O
O
P
O
O
O
P
O
O
O
OP
O
O
P
O
OO
P O
O
O
O
PO
O O
P O
O
O
O
PO
O
Orthophosphate Pyrophosphate Tripolyphosphate Hexametaphosphate
(TPP)(PP)(P) (HMP)
AI
Z M
Xiong, Y.L. 2000. Food Proteins: Processing Applications, Nakai, S.
and Modler, H.W. (Eds.), pp. 89-145. Wiley-VCH, New York.
Actomyosin X-bridge
③ Bind meat together
through gelationHMMLMM
S1S2
Rod1
HMMLMM
S1S2
Rod1
HMMLMM
S1S2
Rod1
HMMLMM
S1S2
Rod1
35-45°C 45-55°C >55°C
LMM HMM
Rod
Structured beef steak
Chopping/milling
15~25°C
Cooking
25 → 75°C
Fat
native myosin
myosin aggregate
Fat
Fat
Fat
Fat
Fat
④ Promote Emulsion
Theno and Schmidt (1982)
3. Nitrites (NO2–)/Nitrates (NO3
–)
4 Main functions
1) Color
2) Antimicrobial (botulinum)
3) Cured favor
4) Antioxidant
Nitric oxide (NO) is the responsible agent
Nitrates allowed for dry cured meats only
NaNO2 + H2O → HNO2 + NaOH
3 HNO2 → HNO3 + 2 NO + H2O
Salami
Ham
“No-Nitrate/Nitrite Added” Meat Curing
Idea: use nitrate or nitrite-containing
natural sources to replace pure nitrate or
nitriteRaddish juice, cabbage juice, celery powder,
spinach extract, sea salt…..
Contain 100-2,000 ppm
Products must be labeled with the statement “No
tritrate or nitrite added except that that found in
radish juices or (other)
Manufacturing Options
A) Addition of natural nitrate source (e.g., celery juice powder) combined with cultures
Staphylococcus carnosusNitrate (NO3
–) Nitrite (NO2–)
Lactobaccilus fementumNitrite (NO2
–) Nitric oxide (NO)
108 CFU/g L. fermentum application level replicates nitrite-cured sausage (60 ppm nitrite) in pink color *Risk: Nitrite level not controllable
B) Pre-fermentation to prepare nitrite
Pre-fermentation
Ferment natural nitrate source (e.g., celery juice, cherry juice)
Staphylococcus carnosusNitrate (NO3
–) Nitrite (NO2–)
Apply at desirable nitrite concentration levels with other cure adjuncts
Antioxidants derived from juicesSebranek and Bacus, 2007
4. Enzymes
-Gln-C-NH2 + H2N-Lys
-Gln-C-NH-Lys-
O
ONH3
Ajinomoto Activa TG
a. Microbial Transglutaminase (MTGase)
Streptomyces mobaraensis
Ramirez-Suarez, J.C., Xiong, Y.L., and Wang, B. (2001). J.
Muscle Foods 12:85-96.
MTGase
b. Glucose Oxidase (GO)
Wang, Xiong, etc., 2016. JAFC, In review
Protein gel
Wang, Xiong, etc., 2016. JAFC, In review
Wang and Xiong (unpublished)
c. Lipases
Di- Mono-
c. Lipases
Control
Lipase a Lipase b
• Flavor profile• Processing time
5. Antioxidants
Singlet oxygen (O2●)
Superoxide radical (O2●-)
Hydroxyl radical (OH●)
Ferryl radical (FeOH3+ or FeO2+)
Perferryl radical (Fe2+-O2●-)
H2O2-activated metmyoglobin
Lipoxygenase
Retard rancidity
Tocopherols (a, b, g, d)
Rosemary extracts and other
plant extracts (tea, licorice,…)
BHA, BHT, PG, TBHQ
Ascorbate (erythorbate)
Citrate
Protein hydrolysates (peptides)
Oxidants present in meats Anti-oxidants added
Antioxidants
Lipid soluble
Water soluble
Tocopherols
Rosemary extracts
Other phenolic extracts
BHA, BHT, PG, TBHQ
Ascorbate (erythorbate)
Citrate
Protein hydrolysates (peptides)
Legal levels of antioxidants
Strict regulation on synthetic antioxidants
- BHA, BHT, TBHQ, PG
In fresh sausage, one antioxidant is allowed at
0.01% of fat content
Combination of antioxidants are allowed at 0.02%
of fat content
For natural antioxidants, more tolerance
*Inhibition of lipid oxidation and
rancidity of cooked pork patties
by licorice phenolic extract
Jiang et al., 2013. J. Food Sci.
Antioxidant Peptides/Protein Hydrolysates
Source Sequence Reference
β-Conglycinin (soy) Leu-Leu-Pro-His-His Chen et al. (2005)
Albumin (rice) Asp-His-His-Gln Wei et al. (2007)
Yellowfish sole
(fermented)
Arg-Pro-Asp-Phe-Asp-Leu-Glu-Pro-Pro-Tyr Jun et al. (2004)
Mussel (fermented) His-Phe-Gly-Asp-Pro-Phe-His Rajapaske et al.
(2005)
Milk (fermented) Val-Leu-Pro-Val-Pro-Gln-Lys Rival et al. (2000)
β-Lactoglobulin (milk) Trp-Tyr-Ser-Leu-Ala-Met-Ala Hernandez-Ledesma
et al. (2007)
Potato protein Mixed peptides (hydrolysates) Wang and Xiong
(2005)
Whey His, Lys, Val, Leu, Ile Pena-Ramos et al.
(2004)
Buckwheat protein Trp-Pro-Leu, Val-Pro-Trp, and Val-Phe-Pro-
Trp, Pro-Trp
Ma et al. (2009)
Storage Time (day)
0 1 2 3 4 5 6 7 8
Pero
xid
e V
alu
e (
me
q/k
g)
0
2
4
6
8
10
12
14
Control
Nonhydrolyzed protein
Hydrolyzed protein
Inhibition of Lipid Oxidation by Potato Peptides in
Cooked Meat:
Lipid-H Lipid-OOH off-flavorX
Wang and Xiong, 2006
Inhibition of Lipid Oxidation by Potato Peptides
in Cooked Pork SausageInhibition of Lipid Oxidation in Cooked Pork Emulsions
By Hydrolyzed Potato Protein
Storage Time (Day)
0 1 3 7
TB
AR
S (
mg
/kg
)
0
2
4
6
8
10
12
14
15% fat
+2.5% HPP
30% fat
+2.5% HPP
by 50-80%
Nieto et al., 2010
Applications of Antioxidative Peptides and
Protein Hydrolysates
Comminuted meat
Hamburgers
Dry sausages
Meat Product
Safety
1. Chemical
2. Microbiological
a) Antioxidant strategies to
mitigate chemical hazards
- Inhibit toxins and carcinogens produced
during processing and cooking
“Processed meat was classified as
carcinogenic to humans (Group
1)”
Meat and meat product toxicity:
Lipid oxidation products (HNE, MDA)
Protein-derived hazards (HAA, PAH)
Nitrosamines (nitrite or nitrate-cured meat )
Carbohydrate-derived toxic compounds (AGE)
Natural Antioxidant Strategies?
4-hydroxy-2-nonenal
(HNE)
Malondialdehyde
(MDA)
Antioxidants inhibit nitrosamine production in nitrite-
cured meats
Table 2 NDEA (ng/mL) in the mixtures of sarcoplasmic (SP) and myofibrillar (MP) protein fractions with
nitrite (pH 6.0) after 1 h cooking at 80 °C
Storage
time (day)
NDEA (ng/mL) in SP1 NDEA (ng/mL) in MP1
Control Tocopherol
(700 ppm)
Tea PE
(300 ppm) Control
Tocopherol
(700 ppm)
Tea PE
(300 ppm)
0 19.8±0.8Ad 19.5±1.2Ac 19.5±0.4Ad 67.8±4.6Ad 64.9±3.4Ac 47.6±1.8Bd
4 72.2±3.8Ac 67.0±3.9Ab 48.5±5.0Bc 88.4±7.1Ac 86.6±7.0ABb 74.8±6.4Bc
7 136.7±4.4Ab 111.9±6.6Ba 76.6±6.8Cb 147.0±8.9Ab 123.8±2.4Ba 103.6±2.8Cb
10 171.0±2.7Aa 119.8±1.5Ba 87.7±3.6Ca 182.8±4.7Aa 129.2±6.7Ba 119.4±4.3Ba
NDEA: N-nitrosodiethylamine
Yang et al., 2014
Correlation between protein/lipid oxidation and
nitrosamine production
Protein oxidation nitrosamines
Lipid oxidation nitrosamines
• A cyclic compound with at least one nitrogen within a ring structure is called a
heterocyclic aromatic amine (HAA); If more than 2 fused benzene rings, then
polycyclin aromatic hydrocarbon (PAH)
• Most HAAs are generated from the reaction of free amino acids, creatinine, and
hexoses. PAH at pyrrolic temperatures
Antioxidants inhibit protein-based toxin formation in cooked
meats
Heterocyclic aromatic amines (HAAs)
“thermic HAAs,” IQ type (imidazoquinoxaline); formed between 100 and 300 °C
“pyrolytic HAAs,” or non-IQ type, formed at higher temperatures, above 300 °C
More than 20 HAAs have been identified in cooked meats
Keating and Bogen, 2004
PhIP in grilled meats
Concentrations of PhIP increase with cooking time
2-amino-1-methyl-6-phenylimidazo[4,5-b]pyridine (PhIP)
Vegas, 2012
Oxidation
56
Meat product Toxin formed Inhibitory antioxidant Responsible
agent
Reference
Fried beef
patties
HAAs (MeIQx
and PhIP)
rosemary, turmeric,
fingerroot, galangal,
cherry, vitamin E
polyphenols Balogh et al. (2000);
Britt et al. (1998);
Puangsombat (2011)
Fried meatballs HAAs (IQ,
MeIQx, PhIP)
Black pepper polyphenols Oz & Kaya (2011)
Cooked beef HAAs Green tea extract Catechin Weisburger et al.
(2002)
Beef juice HAAs (IQ,
MeIQx)
Tomato Carotenoid
Quercetin
Vitaglione et al.
(2002)
Cooked meat ALEs (MDA)
oxidized
cholesterol
ginkgo biloba extract polyphenols Kobus-Cisowska et al.
(2014)
Cooked salted
pork patties
MDA Carnosine Carnosine Decker and Crum
(1992, 1993)
Cooked cured
meat extracts
Nitrosamine
(NDEA)
α-Tocopherol, green tea
extract
Phenolics Yang et al. (2013)
Examples of natural antioxidants that inhibit toxins and carcinogens formation in cooked and processed meat
Proposed pathway for PhIP formation from phenylacetaldehyde,
creatinine, ammonia, and formaldehyde.
Zamora et al., 2014
Proposed mechanism for the inhibition of HAA formation in cooked meat by phenolic
antioxidants. For illustration, gallic acid and 2-amino-1-methyl-6-phenylimidazo[4,5-b]pyridine
(PhIP) are used. (Based on Zomora et al., 2014)
Jiang and Xiong, 2016
a) Binding
(stabilize reactant or
intermediate)
b) Radical scavenging (remove ROS)
c) Detoxifying
(activate defense
mechanism)
Feed rats 2% tea extract for 2 wk before
and 2 wk during PhIP dosing (100 mg/kg)
*Conclusion: Phenolics from teas markedly enhance the
expression of enzymes that metabolize PhIP (detoxify!)
Carter et al., 2007.Comparison of White Tea, Green Tea, Epigallocatechin-3-
Gallate, and Caffeine as Inhibitors of PhIP-Induced Colonic Aberrant Crypts.
Nutrition and Cancer, 58, 60–65.
b) Additive strategies to
mitigate biological threats
- Microbial
For detail, see Jiang and Xiong, 2015. Crit. Rev. Food Sci. Nutr. 55:1886-1901
Ready-To-Eat (RTE) Meat
RTE
1. RTE: what is it?
2. Food safety concern
3. Measures to guard safety
◦ Role of USDA FSIS
◦ Post-lethality processing technology
◦ Formulation technology
◦ Packaging technology
RTE meat and poultry
“Deli meats”Bologna
Wiener
Frankfurter (hotdog)
Ham
Roast beef
Turkey ham
Chicken loaf
Salami
Fermented sausage
RTE Meats
“Ready-to-eat ”
Cooked at low to intermediate
temperatures
◦ 65 to 80oC
◦ Pasteurization
◦ Salmonella, E. coli (O157:H7), Campylobacter,
Clostridium, Listeria monocytogenes
◦ Re-packaged
◦ Require refrigeration
RTE meats
“Ready-to-eat ”
20 to 50% of Americans
consume RTE meats on a
given day.
Similar in many other
countries (Australia,
England, …).
RTE product safety
**Listeria monocytogenes!
Decontamination Technologies
1) Post-lethality (in-package) thermal processing
2) Non-thermal processing
3) Antimicrobial additives
4) Antimicrobial packaging
Antimicrobial additives
Growth Inhibitors
Inhibit L. monocytogenes
Growth is limited to < 2 logs over the
duration of the product’s shelf life
Listeriostatic
Antimicrobial agents
① Organic acids Citric, lactic, malic, benzoic acid
② Salt of organic acids Sodium lactate, diacetate, citrate,
③ Bacteriocins Nisin, pediocin
④ Acidified sodium chlorite
⑤ Lauric Arginate
⑥ Lactoferrin
⑦ Spices/herbs
Organic acids
Reduce the pH of products
Inhibit growth of microorganisms
◦ Membrane
◦ Intracelluar
Dip or spray acids on products
Slices in lactic acid and benzoic acid
Salts of organic acids
Formulated into products
4.8% sodium and/or potassium lactate and 0.25% sodium diacetate approved as antimicrobial agents in meat product formulation.
Synergistic effect of SL and SDA against L. monocytogenes in RTE meat products.
Sodium diacetateSodium lactate
NaO CH3
O O
Sodium lactate (SL) + Sodium
diacetate (SDA)
2.5% SL + 0.1% SDA prevent growth of L. monocytogenes in turkey slurries for 42 days at 4 oC (Schlyter et al., 1993).
1% SL + 0.1% SDA inhibit L. monocytogenes in smoked
wieners for 60 days at 4.5 oC (Glass et al., 2002).
1.6% SL + 0.1% SDA prevent growth of L. monocytogenes in
ham cured ham slices (Glass et al., 2007).
Mode of action: Reduces water activity; acidifies cytoplasm;
interferes with metabolic activity (De Wit and Rombouts,
1990; Ita and Hutkins, 1991; Brul and Coote, 1999)
Bacteriocins
Nisin
Lactococcus lactis
34 amino acids
Bacteriocins
Pediocin
Pediococcus acidilactici
44 amino acids
(N)Lys-Tyr-Tyr-Gly-Asn-Gly-Val-Thr-Cys-Gly-Lys-His-Ser-Cys-Ser-Val-Asp-Trp-Gly-Lys
Asn-Gly-Gln-His-Gly-Gly-Thr-Ala-Trp-Ala-Met-Ala-Gly-Asn-Asn-Ile-Ile-Cys-Thr-Thr-Ala
His-Lys-Cys-Thr-Gly-Gly-His-Gln-Gly-Asn-His-Lys-Cys(C)
+ +++
+
+
+
+ + +
Mode of action
Inactivates L. monocytogenes on RTE meats
a. Disruption of cell membrane (phospholipids)
b. Dissipation of proton motive force
- Energy produced by moving protons across mitochondria membrane:
ΔG = RT ln(H+in/H+out)
Spices
Garlic, sage, cloves, cassia, oregano,
pimento, thyme, rosemary, scutellaria, and
forsythia suspensa
Inhibit L. monocytogenes
Gram+ pathogens are more sensitive
Essential oils of oregano and garlic inhibit
L. monocytogenes when added to edible
films
Inhibition of L. monocytogenes
on ham slices in vacuum at 4oC
Storage time (day)
L.
monocyto
genes (
lg C
FU
/g)
0 7 14 21 28
4
5
6
7
8
9
10
Storage time (day)
Mesophili
c a
ero
bic
bacte
ria (
lg C
FU
/g)
0 7 14 21 28
0
2
4
6
8
10
Storage time (day)
Lactic a
cid
bacte
ria (
lg C
FU
/g)
a
b
c
0 7 14 21 28
4
5
6
7
8
9control
2.5 mg/mL mixed spice extract
5.0 mg/mL mixed spice extract
10.0 mg/mL mixed spice extract
a
Rosemary + licorice (1:1)
Zhang, Kong, Xiong, Sun, 2009. Meat Sci.
Eugenol
Caffeic acidCatechol
Glabrene
Liquiritigenin
O
OHO
OHO
OHO
OH
H
O O
OHHO
H
O O
OHHO
Glabridin
Catechin
Quercetin
Mode of action:Binds membrane proteins and metabolites
Active packaging
Chitosan-coated plastic films containing nisin (500 IU/cm2), sodium lactate (0.01 g/cm2), sodium diacetate (0.0025 g/cm2), potassium sorbate (0.003 g/cm2), or sodium benzoate (0.001 g/cm2)
◦ Completely inhibit L. monocytogenes
on cooked ham stored at 4 oC for
12 weeks (Ye et al., 2008)
Polylactic acid-based film incorporated with 5–15% lactic acid and 10–30% sodium lactate
◦ Completely inhibits L. monocytogenes
(Theinsathid et al., 2011)
Plastic bags coated with a pediocin powder
◦ Completely inhibits L. monocytogenes on cooked ham stored at 4 oC for 12 weeks (Ming et al., 1997)
Meat Products
QualitySafety
Ingredients
processing
Animal Production
Feed additives
Summary
Thank you!
AcknowledgmentsoGraduate students
o Postdoctorals
oCollaborators
Various food
companies
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