Cheesemaking
			
			
			Cheese Problems Solved edited by P. McSweeny 
			(CRC) Cheese is a unique food product which requires a 
			significant amount of scientific knowledge to be produced 
			successfully. However, due to the many complex and inter-related 
			changes which occur during cheese manufacture and ripening, it is 
			still not possible to guarantee the production of premium quality 
			cheese. Written by an international team of renowned contributors, 
			Cheese problems solved provides responses to around 200 of the most 
			frequently asked questions about cheese and the cheesemaking 
			process, in a unique and practical question-and-answer 
			format.Opening chapters concentrate on queries regarding the 
			preparation of cheesemilk, the conversion of milk to curd, the 
			ripening process, pathogens, cheese analysis and the nutritional 
			aspects of cheese, among other issues. The latter part of the book 
			discusses particular types of cheeses including Cheddar, Grana-type 
			cheeses, Mozzarella, Blue, Swiss and Dutch cheeses, to name but a 
			few.
			Edited by a leading expert and with contributions from 
			specialists in this area, Cheese problems solved will be an 
			essential reference source and problem-solving manual for 
			professionals and trainees in the cheese industry.
			P. L. H. McSweeney is Associate Professor in the Department 
			of Food and Nutritional Sciences at University College Cork, 
			Ireland. Dr McSweeney is internationally recognised for his research 
			in cheese science.
			Although cheese is a very ancient food product which 
			originated close to the dawn of agriculture, it is still not 
			possible to guarantee the production of premium quality cheese. The 
			way in which cheese ripens and its quality are often heavily 
			dependent on very small differences in its compositional 
			characteristics. Most cheeses are also very dynamic products and 
			change substantially during ripening. For these reasons, more 
			scientific knowledge is necessary for the successful manufacture of 
			cheese than for perhaps any other food product.
			The objective of this book is to provide practical 
			knowledge about cheese and problems which occur during its 
			manufacture in a unique question-and-answer format which will allow 
			cheesemakers to find information quickly. Because many of the issues 
			dealt with in this book are complex, it is often possible to provide 
			only an overview of the topic and to highlight its main points. In 
			the case of some entries, the objective is to start the reader 
			thinking along the right lines; cheesemakers will require further 
			information before being confident of the solution to a particular 
			problem. Hence, most entries contain a list of Further reading to 
			which the reader is directed for more detailed information on the 
			problem being discussed. In addition, there are relatively few 
			simple cause-andeffect relationships in cheese, and varying one 
			factor often causes changes to numerous other parameters in the 
			cheese. Because of this and to avoid overlap between certain 
			questions, each entry contains cross-references which direct the 
			reader to other entries containing information of relevance to the 
			topic being discussed. This book presupposes the level of knowledge 
			of dairy chemistry and cheese science and technology that would be 
			common among people working in the dairy industry. Hence, there is 
			little discussion of cheesemaking technology or science beyond that 
			essential for the topic under consideration. There follows a list of 
			texts on cheese science and technology and dairy chemistry to which 
			the reader is directed to learn more about the science and 
			technology underpinning cheese manufacture.
			
				- Milk
					- 1 Introduction            
					
					
 
					- 2 What is the typical composition of cow's milk 
					and what milk constituents favour cheesemaking?          
					
					
 
					- 3 How do seasonal variations in milk composition 
					affect cheese quality?    
					
					
 
					- 4 What are milk salts and how do they affect the 
					properties of cheese?      
					
					
 
					- 5 What are the compositions of other species' 
					milks and how does this affect their cheesemaking 
					properties? 
 
				
				 
				- Preparation of cheesemilk
 
				
					- 6 Introduction            
					
					
 
					- 7 What problems are caused by psychrotrophs?        
					
					
 
					- 8 Why do elevated somatic cell counts cause 
					difficulty in cheesemaking?  
					
					
 
					- 9 Why must milk be standardised for cheesemaking?           
					
					
 
					- 10 Why is cheesemilk usually pasteurised?   
					
					
 
					- 11 What effects does pasteurisation have on 
					cheesemilk?    
					
					
 
					- 12 How does one improve the cheesemaking 
					properties of over-pasteurised milk?
					
					
 
					- 13 What is thermisation and why is it used?
					
					
 
					- 14 Why are colours sometimes added to cheesemilk?           
					
					
 
					- 15 What effects does cold storage have on the 
					properties of milk?  
					
					
 
				
				- Ultrafiltration of cheesemilk
					- 16 Why is ultrafiltration used for cheesemaking 
					and how is it applied?       
					
					
 
				
				 
				- Acidification
					- 17 Introduction          
					
					
 
					- 18 What are starters and what starter types are 
					used for cheesemaking?      
					
					
 
					- 19 What problems are caused by antibiotic residues 
					in milk?    
					
					
 
					- 20 What are lactenins and how do these natural 
					substances inhibit acid production?          
					
					
 
					- 21 What are bacteriophage and what strategies 
					should be used to avoid phage infection?           
					
					
 
					- 22 What factors affect the buffering capacity of 
					cheese?     
					
					
 
					- 23 What enzymes from starters contribute to cheese 
					ripening?         
					
					
 
				
				 
				- Conversion of milk to curd
					- 24 Introduction: how does rennet coagulate milk?   
					
					
 
					- 25 Why is the Phe-Met bond of k-casein so 
					susceptible to rennet action?    
					
					
 
					- 26 How can one demonstrate that there are two 
					stages to rennet coagulation?        
					
					
 
					- 27 What enzymes are in rennet?        
					
					
 
					- 28 What factors affect the retention of rennet in 
					cheese curd?  
					
					
 
					- 29 What rennet substitutes are suitable for 
					cheesemaking?   
					
					
 
					- 30 What factors affect rennet coagulation time?       
					
					
 
					- 31 What effects has homogenisation of milk on the 
					manufacture and quality of cheese?    
					
					
 
					- 32 How does homogenisation affect the 
					functionality of cheese?    
					
					
 
					- 33 Why is CaCl2 often added to cheesemilk?          
					
					
 
				
				 
				- Syneresis
					- 34 Introduction: what is syneresis?   
					
					
 
					- 35 How does the composition of milk affect 
					syneresis?       
					
					
 
					- 36 What processing variables affect syneresis?         
					
					
 
					- 37 Why are certain cook temperatures used for 
					certain cheeses? 
 
					- 38 What is case hardening and what problems does 
					it cause?
 
				
				 
				- Salt in cheese
					- 39 Introduction: what are the functions of NaC1 in 
					cheese?       
					
					
 
					- 40 What are the typical NaC1 levels in different 
					cheeses?   
					
					
 
					- 41 What are the differences between dry-salting 
					and brine-salting?     
					
					
 
					- 42 What factors affect salt uptake in cheese curd?   
					
					
 
					- 43 How does NaC1 affect cheese composition?       
					
					
 
					- 44 What causes the outside of brine-salted cheese 
					to become slimy and sticky?     
					
					
 
					- 45 How should cheese brine be prepared and 
					maintained?   
					
					
 
					- 46 How does NaC1 affect the microbiology of 
					cheese?       
					
					
 
					- 47 How can one make low-sodium cheese?  
					
					
 
				
				 
				- Cheese yield
					- 48 Introduction: why is cheese yield important?       
					
					
 
					- 49 How is cheese yield defined?       
					
					
 
					- 50 How can cheese yield be predicted?        
					
					
 
					- 51 What factors associated with the milk affect 
					cheese yield?    
					
					
 
					- 52 What factors under the control of the 
					cheesemaker affect yield?    
					
					
 
				
				 
				- New technologies
					- 53 What potential uses do high hydrostatic 
					pressures and high-pressure homogenisation have in 
					cheesemaking?  
					
					
 
				
				 
				- The microbiology of cheese 
				ripening
					- 54 Introduction          
					
					
 
					- 55 What factors affect microbial growth in cheese?
					
					
 
					- 56 What are non-starter lactic acid bacteria and 
					how do they affect cheese quality?           
					
					
 
					- 57 What causes the development of gas during 
					ripening?    
					
					
 
					- Pathogens and food poisoning bacteria
 
					- 58 Introduction          
					
					
 
					- 59 What cheeses are most liable to pathogens?         
					
					
 
					- 60 Which pathogens survive pasteurisation and 
					which are killed?
 
					- 61 Do pathogens grow during cheese ripening?        
					
					
 
					- 62 What is Mycobacterium avium subsp. 
					paratuberculosis and how is it controlled?           
					
					
 
					- 63 Is Escherichia coli 0157:H7 of concern to 
					cheesemakers?
 
					- 64 What factors should be considered to reduce 
					coliform counts?
 
					- 65 What are enterococci and are they pathogenic?   
					
					
 
					- 66 What factors should be considered when 
					developing a HACCP plan for cheesemaking?          
					
					
 
					- 67 What are biogenic amines and how are they 
					produced?  
					
					
 
					- 68 What are mycotoxins, where do they come from 
					and what problems do they cause?     
					
					
 
				
				 
				- Nutritional aspects of cheese
					- 69 Introduction          
					
					
 
					- 70 What are typical levels of vitamins in 
					different cheeses?
					
					
 
					- 71 Is cheese good for your teeth?      
					
					
 
					- 72 What are typical calcium levels in different 
					cheeses?       
					
					
 
				
				 
				- Packaging
					- 73 Introduction: how may cheese be packaged?       
					
					
 
					- 74 Why does mould develop under the packaging?  
					
					
 
					- Whey processing
 
					- 75 What products may be produced from whey?     
					
					
 
					- Analysis of cheese
 
					- 76 Introduction          
					
					
 
					- 77 What is the correct way to sample cheese for 
					analysis?   
					
					
 
					- 78 How are volatile flavour compounds measured in 
					cheese?   
					
					
 
					- 79 What procedures are available for the sensory 
					analysis of cheese and are they reliable?
					
					
 
					- 80 How reliable is cheese grading?    
					
					
 
				
				 
				- Principal families of cheese
					- 81 Introduction          
					
					
 
					- 82 What is a 'controlled designation of origin'?        
					
					
 
					- 83 How are cheese varieties classified?         
					
					
 
					- 84 How did cheese originate?           
					
					
 
					- 85 Who are the major cheese consumers and 
					producers in the world?         
					
					
 
					- 86 What are the differences between acid-curd 
					cheese and yoghurt/fermented milks?       
					
					
 
				
				 
				- Flavour, texture and flavour 
				defects in hard and semi-hard cheeses
					- 87 Introduction          
					
					
 
					- 88 How does flavour develop in cheese during 
					ripening?     
					
					
 
					- 89 How can the problem of bitterness in cheese be 
					solved?
					
					
 
					- 90 What is hydrolytic rancidity and how can it be 
					avoided?      
					
					
 
					- 91 What is late gas blowing and how may this 
					defect be avoided?
 
					- 92 What general factors affect the texture of hard 
					and semi-hard cheeses?
					
					
 
					- 93 Cheese is weak-bodied. What strategies could be 
					adopted to produce a firmer cheese and what are the effects 
					of each treatment?  
					
					
 
					- 94 What strategies should be adopted and what are 
					the effects of each treatment to obtain a less acid Cheddar 
					cheese?           
					
					
 
					- 95 What strategies can be adopted to soften the 
					texture of a hard cheese?  
					
					
 
				
				 
				- Grana-type cheeses and 
				Parmesan
					- 96 Introduction          
					
					
 
					- 97 What causes the traditional grainy texture of 
					Italian Grana-type cheeses?          
					
					
 
					- 98 What common problems are associated with Grana-type 
					cheeses?  
 
					- 99 How do traditional Italian Grana-type cheeses 
					and industrial `Parmesan' differ?           
					
					
 
				
				 
				- Cheddar cheese
					- 100 Introduction        
					
					
 
					- 101 What is cheddaring and what physicochemical 
					changes occur during this process?     
					
					
 
					- 102 What are the mechanical and slit openings in 
					Cheddar and how may they be avoided?           
					
					
 
					- 103 Why do salted Cheddar curd pieces not fuse 
					together properly?  
					
					
 
					- 104 Why is it important to control the composition 
					of Cheddar cheese to ensure high quality?      
					
					
 
					- 105 Why does cheese develop a pink discoloration?            
					
					
 
					- 106 What factors lead to texture defects in 
					low-fat/reduced-fat Cheddar cheese?  
					
					
 
					- 107 What factors favour the development of calcium 
					lactate crystals in cheese?     
					
					
 
				
				 
				- Dutch-type cheeses
					- 108 Introduction        
					
					
 
					- 109 Why is the surface of Gouda cheese slimy and 
					discoloured?    
					
					
 
					- 110 Why is the texture of Gouda cheese tough and 
					the flavor flat?
					
					
 
					- 111 Why does Gouda cheese have a soapy off-flavour?      
					
					
 
					- 112 Why does Gouda cheese have irregular eye 
					distribution?   
					
					
 
					- 113 What problems do Propionibacterium spp. cause 
					in Gouda cheese? How are they controlled?            
					
					
 
					- 114 Under which conditions do blisters occur under 
					the wax layer of Gouda-type cheese?
					
					
 
					- 115 How may late blowing be avoided in Gouda-type 
					cheeses? 
					
					
 
					- 116 How can excessive gas formation by 
					thermophilic streptococci take place in Gouda cheese?  
					
					
 
				
				 
				- Swiss cheese
					- 117 Introduction        
					
					
 
					- 118 What factors affect eye development in Swiss 
					cheese?
					
					
 
					- 119 What causes 'blind' Emmental cheese?   
					
					
 
					- 120 What causes irregular eye formation, slits or 
					cracks in Emmental cheese?         
					
					
 
					- 121 What is aspartase of Propionibacterium?            
					
					
 
					- 122 How does aspartase activity of 
					Propionibacterium affect Swiss cheese?          
					
					
 
					- 123 How may the size and quantity of the eyes in 
					Emmental-type cheese be controlled?   
					
					
 
					- 124 How do I control the elastic texture of 
					Swiss-type cheese? 
					
					
 
					- 125 Why does Swiss cheese have a sweet flavour?  
					
					
 
					- 126 What are the causes of the most common flavour 
					defects of Swiss cheese?     
					
					
 
					- 127 Is Emmental cheese hygienically safe?   
					
					
 
				
				 
				- White-mould cheese
					- 128 Introduction        
					
					
 
					- 129 Why does the surface pH in Camembert cheese 
					not increase adequately?        
					
					
 
					- 130 Why is mould development on Camembert or Brie 
					inadequate?
 
					- 131 Why does Camembert or Brie have a grey or 
					brown colour?     
					
					
 
					- 132 Why does the texture of Camembert or Brie 
					remain too hard?
 
					- 133 Why does Camembert-type cheese become too 
					liquid?
					
					
 
					- 134 How are spoilage fungi controlled in 
					white-mould cheeses?     
					
					
 
					- 135 How may the 'toad-skin' and 'cat-hair' defects 
					of Camembert cheese be solved?         
					
					
 
					- 136 What causes bitterness and other flavour 
					defects in Camembert? 
					
					
 
				
				 
				- Blue cheese
					- 137 Introduction: what are Blue cheese varieties?    
					
					
 
					- 138 Why does Blue cheese develop brown spots?    
					
					
 
					- 139 How may spoilage fungi be controlled in Blue 
					cheese?
					
					
 
					- 140 Why does Blue cheese not develop adequate 
					veining?  
					
					
 
				
				 
				- Bacterial surface-ripened 
				cheeses
					- 141 Introduction: what are bacterial 
					surface-ripened (smear) cheeses?        
					
					
 
					- 142 What organisms grow on the surface of smear 
					cheeses?      
					
					
 
					- 143 Why might smear cheese develop excessive 
					mould?      
					
					
 
					- 144 Why does cheese not develop an adequate smear?        
					
					
 
					- 145 How may patchy smear development be avoided?         
					 
 
				
				 
				- Low-moisture 
				Mozzarella cheese (LMMC)
					- 146 Introduction        
					
					
 
					- 147 What are pasta-filata cheeses and what 
					physicochemical changes occur during cooking/stretching?   
					
					
 
					- 148 How can expression of free watery serum be 
					avoided in cooked LMMC?       
					
					
 
					- 149 I recently changed from bacterial to direct 
					acidification. Why is my LMMC different?          
					
					
 
					- 150 How may moisture levels in LMMC be controlled 
					and what changes should be expected if moisture changes?            
					
					
 
					- 151 Shredded cheese tends to mat together into wet 
					aggregates. How may the shreddability of LMMC be improved?      
					
					
 
					- 152 Why does LMMC not develop a smooth stretchable 
					consistency on heating?  
					
					
 
					- 153 Why does LMMC become excessively soft and 
					fluid on heating?   
					
					
 
					- 154 Why does LMMC have poor flowability?          
					
					
 
					- 155 Why does LMMC brown excessively on cooking?        
					
					
 
					- 156 Why and how do the functional properties of 
					LMMC change on heating?       
					
					
 
					- 157 Why does LMMC become excessively soft and 
					gummy during ripening?        
					
					
 
					- 158 What factors affect the functionality of LMMC?          
					
					
 
					- 159 LMMC is tough and rubbery; what might be the 
					problem?  
					
					
 
					- 160 What causes the soft rind/soft surface defect 
					in LMMC?      
					
					
 
					- 161 What causes soft body defect in LMMC?         
					
					
 
					- 162 How may the development of free oil during 
					melting be controlled?    
					
					
 
					- 163 How can the browning rate of LMMC be 
					controlled?   
					
					
 
				
				 
				- Cheeses ripened in brine
					- 164 Introduction        
					
					
 
					- 165 What causes early and late gas blowing in 
					white-brined cheese?   
					
					
 
					- 166 What causes blowing of the white-brined cheese 
					containers?    
					
					
 
					- 167 How may mouldiness in white-brined cheese be 
					avoided?  
					
					
 
					- 168 What causes softening of the cheese body in 
					white-brined cheeses?     
					
					
 
					- 169 Why is the brine surrounding my white-brined 
					cheese ropy?     
					
					
 
				
				 
				- Acid and acid/heat-coagulated 
				cheeses
					- 170 Introduction        
					
					
 
					- 171 How may wheying off (spontaneous syneresis) in 
					Quarg be avoided?  
					
					
 
					- 172 Why is Quarg dry and grainy?    
					
					
 
					- 173 How may over-acid and bitter flavour defects 
					in Quarg be avoided?   
					
					
 
					- 174 How may the viscosity of Cream cheese be 
					controlled?       
					
					
 
					- 175 Free oil forms in Cream cheese at the outlet 
					of the heat exchanger. How can this problem be resolved?         
					
					
 
					- 176 Why is the coagulum of Cottage cheese weak 
					with poor syneresis?      
					
					
 
					- 177 What is agglutination of starter bacteria and 
					how do I avoid sludge formation?          
					
					
 
					- 178 How do I solve the 'floating curd' defect in 
					Cottage cheese?    
					
					
 
					- 179 Why are the curd particles for Cottage cheese 
					slick and slimy?
 
					- 180 Why is there whey separation from my Cottage 
					cheese after packaging?         
					
					
 
					- 181 What strategies should be adopted to improve 
					the yield of Cottage cheese?    
					
					
 
					- 182 What are the likely causes of surface 
					discoloration, off-flavours and bitterness in Cottage 
					cheese?    
					
					
 
					- 183 How may the shelf-life of Cottage cheese be 
					extended?         
					
					
 
					- 184 What are harsh and green flavour defects in 
					Cottage cheese?   
					
					
 
					- 185 How may the mouthfeel of Queso Blanco be 
					improved?       
					
					
 
					- 186 What approaches may be used to control the 
					texture of 
					Queso Blanco?           
					
					
 
				
				 
				- Cheese as a food ingredient
					- 187 Introduction        
					
					
 
					- 188 How may the browning of heated cheese be 
					controlled?      
					
					
 
				
				 
				- Processed cheese
					- 189 Introduction: what is processed cheese?            
					
					
 
					- 190 Why does processed cheese sometimes have a 
					gummy pudding-like texture and oil-off?        
					
					
 
					- 191 Why does processed cheese sometimes have a 
					soapy flavour?
 
					- 192 How is the firmness and spreadability of 
					processed cheese controlled?            
					
					
 
					- 193 Why does processed cheese have a dry, short, 
					crumbly texture?
 
					- 194 Why does processed cheese have a soft, 
					inelastic, adhesive and spreadable texture?   
					
					
 
					- 195 What causes crystals in processed cheese and 
					how can this problem be minimised?     
					
					
 
				
				 
				- Cheese-like products
					- 196 Introduction: what are analogue cheeses?          
					
					
 
					- 197 What is enzyme-modified cheese?