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Current Trends in Natural Preservatives for Fresh Sausage Products

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Current Trends in Natural Preservatives for Fresh Sausage Products Trends in Food Science & Technology 45 (2015) 12e23 Review Current trends in microbial growth of spoilage and pathogenic organisms, natural preservatives has a high fat content favourable for lipid oxidation, is stored in oxygen semi-permeable packaging and is kept at refrigeration temperatures. These products, therefore, for fresh sausage need to be preserved to maintain the quality of the products. The antimicrobial and/or antioxidant preservatives products currently employed in these products are chemicals, e.g. sulphur dioxide (SO2) as antimicrobial and colour preserva- tive (Romans, William, Carloson, Greaser, & Jones, 2001) Celia J. Hugo* and Arno Hugo and/or synthetic antioxidants such as butylated hydroxyto- Department of Microbial, Biochemical and Food luene (BHT), butylated hydroxyanisole (BHA) and propyl Biotechnology, University of the Free State, PO Box gallate (Kim, Cho, & Han, 2013). 339, Bloemfontein, 9300, South Africa (Tel.: D27 (0) The synthetic preservatives have many advantages but 51 4012692; fax: D27 (0)51 4019335; e-mail: hugocj@ have come under the scrutiny of consumers. These preser- ufs.ac.za) vatives include nitrates, benzoates, sulfites, sorbates, form- aldehyde and others pay possess life-threatening side effects (Sultana et al., 2014). Gunnison, Jacobsen, and Natural preservatives from bacteria, plants and animals Schwartz (1987) have stated that the use of sulphite as a currently in use in fresh sausage manufacture were investi- preservative can trigger different allergic reactions in sul- gated. Bacteriocins and organic acids from bacterial origins phite hypersensitive consumers. Symptoms such as asthma, showed good antimicrobial activities against pathogens. urticaria, abdominal pains, nausea, diarrhoea, seizures and Plant-derived antimicrobials could increase the shelf-life of anaphylactic shock resulting in death have been recorded. fresh sausages and in some cases also decrease lipid oxidation Antioxidants such as BHT and BHA are associated with and decrease colour loss. Chitosan was the only animal- possible carcinogenic effects although their use has been derived antimicrobial investigated and also increased shelf restricted (Kim et al., 2013). These health dangers have re- life of fresh sausages. It was evident that the natural antimicro- sulted in the need and demand by consumers for using nat- bials would perform even better in combination with other ural preservatives (Ban~on, Dıaz, Rodrıguez, Garrido, & natural antimicrobials, or lowered levels of synthetic antimi- Price, 2007). crobials or other hurdles such as specific packaging material. The research on natural preservatives included investiga- tions of the antimicrobial and antioxidant characteristics of compounds derived from microbial, plant and animal sour- Introduction ces (Dillon & Board, 1994). Plant derived preservatives Sausages are products manufactured from fresh commi- (grape, rosemary extract, etc.) and animal derived preserva- nuted meats from different meat species, such as pork, tives (e.g., chitosan from fish) have been shown to have beef, chicken, fish and buffalo (Raju, Shamasundar, & antioxidant and antimicrobial properties (Ban~on et al., Udupa, 2003; Sachindra, Sakhare, Yashoda, & Rao, 2005; 2007). Some plant extract products, e.g. rosemary, even Sallam, Ishioroshi, & Samejima, 2004). The comminuted have health benefits such as liver protective and anti- meats are then modified by various processing technologies tumour activities (Balentine, Crandall, O’Bryan, Duong, and stuffed in a casing to yield specific sensory and storage & Pohlman, 2006). characteristics (Savic, 1985). Preservatives are commonly The aims of this review were to give a definition and used to enhance their quality, shelf life and safety classification of sausages and fresh sausages and illustrate (Sultana et al., 2014). the factors influencing the quality of fresh sausages. The Fresh sausages are highly perishable products since it is chemical antimicrobials and antioxidants traditionally manufactured from fresh ground meat, is favourable for used for fresh sausage preservation will be mentioned. Nat- ural antimicrobials and/or antioxidants from microbial-, * Corresponding author. plant- and animal-derived compounds and its use in fresh http://dx.doi.org/10.1016/j.tifs.2015.05.003 0924-2244/Ó 2015 Elsevier Ltd. All rights reserved. C.J. Hugo, A. Hugo / Trends in Food Science & Technology 45 (2015) 12e23 13 sausages will then be discussed in terms of mode of action, byproducts (e.g., heart, kidney, liver). They may contain not safety and applications. more than 3% water of the total ingredients in the product. Fresh sausages are usually seasoned, frequently cured, and may contain binders and extenders (e.g., wheat flour, non- Classification of sausage products Because sausage manufacturing has been practiced fat dry milk). They must be refrigerated and thoroughly before recorded history, it is not certain how and when the cooked before eating. Although plenty of varieties of fresh first sausage was produced (Savic, 1985). The word sausages do exist, the content of the most known varieties “sausage”, however, is derived from saussiche (Old Norman is illustrated in Table 2. French), salsıcia (Late Latin) or from salsus (Latin) which means “salted” (Harper, 2001e2014). According to Rust Factors influencing the quality of fresh sausages (1987) the preparation of sausages began with a simple pro- The quality of fresh sausages is of major importance cess of salting and drying meats which aided in the preser- since the shelf-life of the products depends on this aspect. vation of the sausages. Flavourings and spices were added Spoilage of food involves a complex process and excessive to improve the flavour of the product. The product was amounts of food may be lost, which results in high eco- then stuffed in a container, namely the gastrointestinal tract nomic losses or even pose health hazards (Al-Sheddy, Al- of animals, to make the product more convenient to eat. Dagal, & Bazaraa, 1999; Liu, Yang, & Li, 2006). Sausages are defined as comminuted seasoned meats, Spoilage of fresh sausages may result in changes in the stuffed into casings, and may be smoked, cured, fermented sensory (colour, odour, flavour, texture) characteristics of and heated. A wide variety of sausages products can be pro- the product which may be unacceptable for consumers. duced by altering the meat formulation, processing temper- These changes may be brought about by proteolysis, lipol- ature, types of casings and the particle size of the casings ysis and lipid oxidation in the absence of micro-organisms. (Savic, 1985). A classification of sausages based on charac- Microbial growth is, however, by far the most important teristics, is given in Table 1. This review will, however, factor causing spoilage of fresh products (Zhou, Xu, & focus only on fresh sausages. Liu, 2010). Fresh sausages Microbial composition According to the Food Safety and Inspection Service Meat in general is an ideal growth medium for a wide (FSIS) of the United States Department of Agriculture range of microorganisms (Mathenjwa, Hugo, Bothma, & (USDA-FSIS, 2014), fresh sausages are a coarse or finely Hugo, 2012; Russo, Ercolini, Mauriello, & Villani, 2006; comminuted (reduced to minute particles) meat food product Zhang, Kong, Xiong, & Sun, 2009). Aerobic colony counts prepared from one or more kinds of meat, or meat and meat may range from 1.5 Â 103e2.1 Â 108 cfu/g for fresh Table 1. Sausage classification (adapted from Savic, 1985). Classification Characteristics Examples Raw sausages Fresh Made from fresh comminuted, uncured, non-smoked meats. Breakfast sausage (USA), boerewors Must be refrigerated prior to heating by the consumer. (South Africa), bratwurst (Germany), merguez (North Africa), siskonmakkara (Finland) Fermented Made from comminuted, cured or uncured, fermented and often smoked meats. Not heat-processed. Semidry Stuffed in medium- and large-diameter artificial casings. Variety of summer sausages, cervelats, (quickly fermented) “Tangy” flavour produced by fermentation. Length of smoking mettwursts, Lebanon bologna (USA) and fermentation depends on type but rarely exceeds a few days. Improved stability of stored refrigerated. Dry Different types of salamis, droewors€ (slowly fermented) (South Africa, not fermented) Heat-processed sausages Smoked precooked Mostly comminuted, cured, non-fermented. Final cooking Chinese pork sausages, kielbasa before consumption Emulsion-type Made from comminuted well-homogenized cured meats, Frankfurters, wieners, bologna, fat, water and seasoning. Usually smoked, slightly cooked. mortadella Ready-to-eat product. Cooked Made from previously comminuted cooked fresh or Liver sausage, Braunschweiger cured raw materials. Final cooking after stuffing. With or without smoking. Ready-to-eat product. 14 Table 2. Content of the major fresh sausage varieties produced world-wide. Variety Meat Fat Other ingredients Casing Reference Breakfast sausage Meat and meat by products Not more than 50% Salt, pepper, sage. Binders USDA-FSIS (1999, 2014), http://en.wikipedia. (United States of multiple species. May by weight and extenders up to 3.5%. org/wiki/Breakfast_sausage, accessed of America) contain mechanically-separated Paprika not permitted. on 25/11/2014 product up to 20% of the meat portion. Fresh pork sausage Pork, no pork by products Not more than 50% Salt, pepper. Flavouring: Narrow (26e28 mm) USDA-FSIS (1999, 2014), Savic (1985) C.J. Hugo, A. Hugo / Trends in Food Science & Technology
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