Dairy Science and Food Technology Homepage
Home  Cheese starters Donate support Site  Probiotics Cheese yield  Cheese quality Cheese science  Italian cheese Anti-microbial  proteins  Phages Primary production  Ice cream Wine Calculators  Harvard referencing  Packaging  Jobs
Forum Home Forum Home > Cheese quality > Cheese quality
  New Posts New Posts RSS Feed - Bitterness in (Gouda) cheese
  FAQ FAQ  Forum Search   Events   Register Register  Login Login

Bitterness in (Gouda) cheese

 Post Reply Post Reply
Message Reverse Sort Order
Mike Mullan View Drop Down
Guest Group
Guest Group
Post Options Post Options   Thanks (0) Thanks(0)   Quote Mike Mullan Quote  Post ReplyReply Direct Link To This Post Topic: Bitterness in (Gouda) cheese
    Posted: 23 Mar 2010 at 10:46pm
There are several reasons why bitterness may develop in cheese. With a few exceptions bitterness is generally associated with proteolysis.

Protein breakdown is critical to texture and flavour development in many cheeses. However, the process can generate hydrophobic peptides that if present at a sufficiently high concentrations can give rise to bitterness. Because these peptides are soluble in fat bitterness tends to be more of a problem in reduced fat varieties.

There has been considerable research into the causes of bitterness in Cheddar and Gouda cheeses and there is now a good understanding of 1) the mechanisms responsible for bitterness and 2) how to prevent or control bitterness.

The following is an attempt at summarising and simplifying how bitterness is produced. The coagulant, rennet, hydrolyses casein to produce polypeptides. These are then degraded to peptides and amino acids by peptidases associated with the membrane proteins of the starter cultures, lactococci, used in the cheese making process.

Bitterness will only develop if a number of conditions are met namely, the cheese must be of relatively low salt in moisture (S/M) content, bitterness is rare in Cheddar cheese of greater than 5% S/M; there must also be a high population of starter lactococci and these lactococci must have a particular type of peptidase that produces hydrophobic peptides. Additionally the presence of certain non-starter lactic acid bacteria, NSLAB, can prevent bitterness due to their ability to degrade the hydrophobic peptides produced by lactococci. These can be naturally present in some cheese plants. When you take these factors into consideration, along with the natural variations that can occur in fat content in cheese readers will start to gain an appreciation of what is involved in the development of bitterness in cheese.

Control of bitterness starts with adjusting the cheese manufacturing conditions to ensure that salt levels are correct for the variety being manufactured, ensuring that ‘non-bitter producing starters’ are used and adjusting manufacturing to control starter populations. Many cheese makers also use starter adjuncts. The most effective for debittering contain strains of Lactobacillus helveticus that produce peptidases active against the bitter peptides. Note only some strains of Lactobacillus helveticus have a proven antibittering effect.

Some culture suppliers will have tested their starters for bitter peptide production, there are several test methods available, and may have strains of Lactobacillus helveticus that have been proven to be effective in cheese trials. Incidentally there are a number of well characterised Lactococcus lactis subsp cremoris strains that rarely produce bitter cheese; these are available commercially. Your culture supplier should therefore be part of your problem solving team!

Though not well publicised, for commercial reasons, blends of thermophilic starters along with lactococci are being increasing used in both Cheddar and Gouda manufacture. There is some anecdotal information suggesting that use of these starter blends results in less bitterness problems.
Back to Top
Sponsored Links

Back to Top
Kobus View Drop Down
Guest Group
Guest Group
Post Options Post Options   Thanks (0) Thanks(0)   Quote Kobus Quote  Post ReplyReply Direct Link To This Post Posted: 23 Mar 2010 at 10:45pm
Can anybody help me with the follow questions

1 How does bitterness in cheese develop
2 How does one determine the cause or -
3 how does one prevent it

Thank you
Back to Top
 Post Reply Post Reply
  Share Topic   

Forum Jump Forum Permissions View Drop Down

Forum Software by Web Wiz Forums® version 12.03
Copyright ©2001-2019 Web Wiz Ltd.