Download Organic Acids and Food Preservation by Maria M. Theron PDF

By Maria M. Theron

Although natural acids were used to counteract pathogens in meals for a few years, there's a obvious have to verify and increase their persisted effectiveness and sustainability. there's additionally a turning out to be call for for meals which are produced utilizing milder remedies (e.g., much less warmth, salt, sugar, and chemical substances) and more moderen applied sciences to avoid the expansion of harmful micro organism.

Organic Acids and foodstuff upkeep concentrates on secure and powerful suggestions for employing natural acids to prevention of bacterial development. regardless of the wide variety of doubtless precious antimicrobials, rather few are appropriate in practice—and this useful hands-on consultant explains why. With its wealth of data and infrequent concentration exclusively at the topic, it presents useful instruments that may be utilized in the meals undefined, numerous educational disciplines, study, schooling, and nutrients expertise fields to raised comprehend the matter and advance optimum recommendations.

  • Why are preservative techniques ineffective?
  • Why are microorganisms turning into acid tolerant and resistant in different ways?

To solution those and different key questions, the authors mix examine findings from industries and laboratories world wide, particular program routine, destiny clients, and different details that's important to the profitable use of natural acids as foodstuff preservatives. After outlining demanding situations that the foodstuff faces from smooth client tendencies, nutrients laws, and different stumbling blocks, this publication then explores attainable options which are acceptable not just to nutrients technological know-how yet to microbiology, foodstuff technology, foodstuff expertise, biochemistry, and biotechnology. it's going to turn into a worthwhile addition to the library of any scientist or researcher operating in those and different fields.

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Extra resources for Organic Acids and Food Preservation

Example text

76). , 2003). 2 Structure of acetic acid. 3 Structure of l-ascorbic acid. also much more inhibitory against Listeria than lactic acid and addition of acetic acid usually results in greater cell destruction, but similar concentrations of citric acid and lactic acid will reduce the pH of a broth such as tryptic soy broth more than acetic acid (Doyle, 1999). , 2003). Intracellular acidification may, however, play a role in acids with short aliphatic chains (such as acetic acid), and much higher concentrations (20–80 mM) are needed for growth inhibition (Hazan, Levine, and Abeliovich, 2004).

These products have been proven to be environmentally friendly alternatives to biodegradable plastics derived from petrochemical materials (Zhang, Jin, and Kelly, 2007). Lactic acid is slightly lipid soluble and diffuses slowly through the cell membrane. , 2004). Lactic acid is the major LAB metabolite, causing pH reductions that inhibit many microorganisms. However, both acetic and propionic acids have higher pKa values than lactic acid and, therefore, have a higher proportion of undissociated acid at a certain pH (Schnürer and Magnusson, 2005).

It is one of the largest carboxylic organic acids produced by Aspergillus niger through fermentation of low molecular weight carbohydrate solutions (Nikbakht, Sadrzadeh, and Mohammadi, 2007). Citric acid is the most important organic acid produced: global production is estimated to be around 620,000 metric tons per year and represents 60% of all food acidulants utilized worldwide (Krishnakumar, 1994; Moresi and Sappino, 1998; Nikbakht, Sadrzadeh, and Mohammadi, 2007). The entire production of citric acid is carried out by fermentation.

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