"The book will comprise a detailed examination of faults and flaws that can impact upon the quality of wines. There are some faults that render wines unsaleable and undrinkable and others that have a negative effect upon quality and enjoyment. Each faultis discussed as follows: 1. What it is, in basic terms 2. How is it detected by: a) sensory recognition; and b) laboratory analysis 3. What is the cause? 4. At which stage/s of production, maturation or storage can it occur? 5. Can it be prevented? 6. Can it be rectified? 7. Detailed science including research Each topic will be examined in both practical and scientific terms. There will also be discussion of detection of faults by tasting and laboratory analysis, and good practice in the vineyard and winery to prevent faults from occurring"--
The book will comprise a detailed examination of faults and flaws that can impact upon the quality of wines. There are some faults that render wines unsaleable and undrinkable and others that have a negative effect upon quality and enjoyment. Each fault is discussed as follows: 1. What it is, in basic terms2.
WINE FAULTS AND
FLAWS Wine Faults and Flaws: A Practical Guide
An essential guide to the faults and flaws that can affect wine
Written by the award-winning wine expert, Keith Grainger, this book provides a detailed examination and explanation of the causes and impact of the faults, flaws and taints that may affect wine. Each fault is discussed using the following criteria: what it is; how it can be detected by sensory or laboratory analysis; what the cause is; how it might be prevented; whether an affected wine is treatable, and if so, how; and the science applicable to the fault.
The incidences of faulty wines reaching the consumer are greater than would be regarded as acceptable in most other industries. It is claimed that occurrences are less common today than in recent recorded history, and it is true that the frequency of some faults and taints being encountered in bottle has declined in the last decade or two. However, incidences of certain faults and taints have increased, and issues that were once unheard of now affect many wines offered for sale. These include &;reduced&; aromas, premature oxidation, atypical ageing and, very much on the rise, smoke taint.
This book will prove invaluable to winemakers, wine technologists and quality control professionals. Wine critics, writers, educators and sommeliers will also find the topics highly relevant. The wine-loving consumer, including wine collectors will also find the book a great resource and the basis for discussion at tastings with like-minded associates.
ACKNOWLEDGMENTS
PREFACE
INTRODUCTION
CHAPTER 1 Faults, Flaws, Off-Flavours, Taints, and Undesirable Compounds
1.1 Introduction
1.2 Advances in wine technology in recent decades
1.3 Changes in markets and the pattern of wine consumption in recent
decades
1.4 The possible impact of some fault compounds upon human health
1.5 Sulfur dioxide and other possible allergens
1.6 Faults and taints
1.7 Distinguishing between faults and flaws
1.8 Sensory detection (perception) thresholds and sensory recognition
thresholds
1.9 Consumer Rejection Thresholds (CRTs)
1.10 Basic categories of wine faults
1.11 Flaws
1.12 The incidence of wine faults
1.13 'Faulty' wines that exude excellence
1.14 Final reflections
CHAPTER 2 Wine Tasting
2.1 Introduction
2.2 Anosimics, the Fatigue Effect, and Supertasters
2.3 Tasting conditions, equipment and glassware
2.4 The use of a structured tasting technique, and detection of faults
2.5 Appearance
2.6 Nose
2.7 Palate
2.8 Assessment of Quality
2.9 Assessment of Readiness for drinking/potential for ageing
2.10 Grading wine the award of points
2.11 Blind tasting
2.12 Final reflections
CHAPTER 3 Chloroanisoles, Bromoanisoles, Halophenols
3.1 Introduction
3.2 Haloanisole contaminations in the food, drinks, water, and
pharmaceutical industries
3.3 Haloanisole contamination of wines
3.4 The economic and reputational costs to wine producers and the wine
industry
3.5 Sensory characteristics and detection of haloanisoles in wine
3.6 The haloanisoles responsible and their detection thresholds
3.7 The formation pathways of haloanisoles from halophenols
3.8 Contamination of cork with TCA and other chloroanisoles
3.9 The cork industry in the dock
3.10 The cork industry begins to address the issues
3.11 The cork industrys recent initiatives for haloanisole prevention and
extraction
3.12 Winery and cooperage sources of haloanisole contamination in wines
3.13 Laboratory analysis for TCA and other haloanisoles in corks and wine
3.14 Prevention of haloanisole contamination of wineries and wines
3.15 Treatment of wines contaminated with haloanisoles
3.16 Chlorophenols and bromophenols as taints
3.17 'Musty' taints unrelated to halophenols and haloanisoles.
3.18 Final reflections
CHAPTER 4 Brettanomyces (Dekkera) and Ethyl phenols
4.1 Introduction
4.2 Background and history
4.3 The Brett Controversy
4.4 Sensory characteristics, and detection of Brettanomyces related
compounds in wine
4.5 The origins of Brettanomyces and formation of related compounds in
wines
4.6 The danger periods and favourable conditions for the growth of
Brettanomyces
4.7 Why are Brettanomyces related compounds found mostly in red wines?
4.8 Prevention Formulation and implementation a Brett Control Strategy.
4.9 Laboratory Analysis for Brettanomyces and volatile phenols
4.10 Treatment of affected wines
4.11 What the future might hold for microbiological methods to inhibit
Brettanomyces?
4.12 Final reflections
CHAPTER 5 Oxidation, Premox and Excessive Acetaldehyde
5.1 Introduction
5.2 Oxidation in must and wine
5.3 Sensory characteristics and detection of excess acetaldehyde and
oxidation in wine
5.4 Deliberately oxidised and highly oxygenated wines
5.5 Metal ions and substrates for oxidation
5.6 Enzymatic oxidation
5.7 Chemical oxidation
5.8 Microbial oxidation
5.9 Acetaldehyde
5.10 Sotolon
5.11 Oxygen management in winemaking
5.12 Oxygen uptake during cellar operations
5.13 Containers and closures
5.14 Pinking
5.15 Premature oxidation (Premox)
5.16 Prevention of excess acetaldehyde and oxidation
5.17 Additions of ascorbic acid antioxidant or oxidising agent?
5.18 Laboratory analysis
5.19 Treatments
5.20 Final Reflections
CHAPTER 6 Excessive sulfur dioxide, volatile sulfur compounds and reduced
aromas
6.1. Introduction
6.2 The presence and role of sulfur, sulfur dioxide, sulfite and sulfate in
wine production
6.3 Excessive sulfur dioxide
6.4 Oxygen management in winemaking
6.5 Reduction in wine positive and negative
6.6 Hydrogen sulfide
6.7 Prevention of hydrogen sulfide formation
6.8 Treatment for hydrogen sulfide in wine
6.9 Laboratory analysis for sulfur dioxide, hydrogen sulfide and volatile
sulfur compounds
6.10 Final reflections
CHAPTER 7 Excessive volatile acidity and ethyl acetate
7.1 Introduction
7.2 Volatile acidity and ethyl acetate
7.3 The controversy of high levels of volatile acidity
7.4 Fixed acids and volatile acids
7.5 Sensory characteristics and detection of volatile acidity
7.6. Legal limits
7.7 Acetic acid bacteria
7.8 Production of acetic acid in wine
7.9 Ethyl acetate
7.10 Prevention of excessive volatile acidity and ethyl acetate.
7.11 Laboratory analysis
7.12 Treatments
7.13 Final reflections
CHAPTER 8 Atypical ageing (ATA) sometimes called Untypical ageing (UTA)
8.1 Introduction
8.2 The Atypical Ageing Controversy
8.3 The causes of Atypical Ageing and formation pathways
8.4 Sensory detection
8.5 Laboratory detection
8.6 The main viticultural causes of ATA.
8.7 Prevention
8.8 Treatments
8.9 Final reflections
CHAPTER 9 Fermentation in bottle
9.1 Introduction
9.2 Sensory detection
9.3 Alcoholic fermentation in bottle
9.4 Malolactic fermentation (MLF) in bottle.
9.5 Prevention preparing wine for bottling and the bottling process
9.6 Treatment
9.7 Final reflections
CHAPTER 10 Hazes
10.1 Introduction
10.2 Protein haze
10.3 Microbial hazes
10.4 Metal hazes
CHAPTER 11 Lactic acid bacteria related faults
11.1 Introduction to lactic acid bacteria
11.2 Lactic acid bacteria and their natural sources
11.3 Malolactic fermentation (MLF)
11.4 Undesirable aromas, off-flavours and wine spoilage caused by Lactic
Acid Bacteria
11.5 Prevention of lactic acid bacteria related faults
11.5 Analysis
11.6 Final reflections
CHAPTER 12 Smoke taint and other airborne contaminations
12.1 Introduction
12.2 Smoke taint compounds in the atmosphere
12.3 Critical times in the growing season and duration of exposure for smoke
taint to impact
12.4 The volatile phenols responsible for smoke taint; their odours and
flavours and sensory detection thresholds
12.5 Smoke taint in wines
12.6 Other sources of guaiacol and 4-methyl-gauaiacol in wines
12.7 Laboratory Testing
12.8 Prevention of development of smoke related volatile phenols from
affected grapes
12.9 Treatments.
12.10 Other airborne contaminations
12.11 Final reflections
CHAPTER 13 Ladybeetle and brown marmorated stink bug taints
13.1 Introduction
13.2 Methoxypyrazines
13.3 Ladybeetles (also known as ladybirds and ladybugs)
13.4 Brown marmorated stink bug (Halyomorpha halys) taint
13.5 Final reflections
CHAPTER 14 Sundry faults, contaminants, including undesirable compounds from
a health perspective and flaws due to poor balance
14.1 Mycotoxins, particularly Ochratoxin A
14.2 Dibutyl phthalate and other phthalates
14.3 Ethyl Carbamate
14.4 Biogenic amines
14.5 Ethyl sorbate and sorbyl alcohol (geraniol) off-odours
14.6 Paper-taste
14.7 Plastic taints styrene
14.8 Indole
14.9 Geosmin
14.10 2-bromo-4-methylphenol iodine, oyster taste
14.11 Heat damage
14.12 Matters of balance
14.13 Final reflections
CHAPTER 15 Faults or not? TDN and tartrate crystals
15.2 Tartrate deposits
15.3 Final reflections
CHAPTER 16 Must correction, wine correction and alcohol reduction using
membrane technologies
16.1 Introduction
16.2 Membrane processes used in the wine industry
16.3 Clarification
16.4.3 Cross-flow micro filtration
16.5 Membrane Fouling
16.6 Must correction, wine correction and alcohol reduction using membrane
technologies.
16.7 Fault correction
16.8 Wine stabilisation and pH adjustment by electrodialysis
16.9 Final redlections
CHAPTER 17 The impact of container and closure upon wine faults
17.1 Introduction
17.2 Glass bottles
17.3 Bottle closures
17.4 The maintenance of adequate fee and molecular SO2 in bottled wine.
17.5 Natural Cork
17.6 Technical corks, including agglomerated corks
17.7 Diam cork closure
17.8 Synthetic closures
17.9 Screwcaps
17.10 VINOLOK
17.11 Some advantages and disadvantages of various closure types
17.12 The bottling operation
17.12 PET bottles.
17.13 Cans
17.14 Bag-in-box
17.15 Final reflections
CHAPTER 18 Best practice for fault and flaw prevention
18.1 The wine industry
18.2 HACCP
18.3 Standard operating procedures (SOPs)
18.4 Traceability
18.5 Winery design
18.6 Cleaning and sanitation
18.7 Good practice winemaking procedures to avoid spoilage, faults and
flaws.
18.8 The use of oenological additions and processing aids
18.9 Routine wine analysis
18.10 Final, final reflections
References
APENDIX
BIBLIOGRAPHY
GLOSSARY
USEFUL WEBSITES
ABOUT THE AUTHOR
Keith Grainger is a wine writer, educator and consultant in wines and wine technology. His last book Wine Production and Quality, 2nd Edition (with coauthor Hazel Tattersall) won the Gourmand Award for the Best Wine Book for Professionals in 25 Years.
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