The Complete Grape Growing System

The Complete Grape Growing System

The Complete Grape Growing System developed by Danie Wium is an excellent guide with comprehensive details to assist the enthusiast grape grower in achieving a successful outcome for years. It's designed for the absolute newbie but also contains information even the most experienced grape grower can use to boost their own grape farm. This book is so well written that even a person with no knowledge at all about growing grapes can easily understand and follow the directions given. The drawings and photographs are excellent and make this a very user friendly book indeed. The written work is very easy to understand and is not complicated by a lot of scientific jargon. Danie is a professional grape grower and has put together a course to help people grow grapes at home. His course also includes a video series that shows professional tips all recorded on his own farm. I recommend anyone considering growing their own grapes to buy this e-book. Continue reading...

The Complete Grape Growing System Summary

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Grape Growing And Making Your Own Signature Wine

Here's just a taste of what you'll discover: A complete guide to selecting the perfect location and setting up your vineyard. The 4 factors you Must consider before you plant your grapes. The types of grapes you plant determine the type of wine youll eventually have. Learn how to determine which grapes are best for you! Learn the single most important factor that determines the quality of your wine grapes and how to preserve it! The importance of three climate factors in growing grapes. The more than 40 types of grapes that are suitable for wine making. The 5 essential aspects of ensuring healthy, vibrant grapes (and in turn delicious wine). Without these, your venture just cant succeed. An entire chapter devoted to vineyard care, starting with the first year of cultivation. The 5 most efficient ways to control weeds in your vineyard. A complete guide to disease and pest control practices for your vineyard. Vital information on vineyard design and layout. The 5 basic sure-fire steps to creating a perfect bottle of wine. All the necessary tools youll need for wine making. A complete list of all the wine making ingredients youll need for the process. An entire chapter devoted to harvesting grapes for the wine making process. A crash course on the role acidity plays in the ultimate taste and success of your wine. All about the process of alcoholic fermentation, including a guide to its two essential ingredients. What malolcatic fermentation is and the effects it has on wine. The importance of racking and what it ultimately means to the quality of your wine. How oxygen affects the taste of your wine. An entire chapter devoted the two principle methods of producing white wines. The variety of sweeteners you can use in your wine making process and those you cant! An entire chapter devoted solely to the creation of red wines from the picking of the grapes to the final process. The two types of wine presses and which one is the better choice for you. How to properly transfer pressed wine to your storage vessel and why settling is an essential part of the process.

Grape Growing And Making Your Own Signature Wine Summary

Contents: 121 Page Ebook
Author: Kacy Waters
Official Website: ww7.grapegrowinginfo.com

Grapes

Grapes (vitis vinifera and vitis lubruscana), especially the dark red varieties, contain generous amounts of flavonoids and relatively high levels also of hydrox-ycinnamates that all exert potent anti-oxidant activities in various assay systems. The antioxidant activity of wines have received much attention owing to their possible physiological benefits. However, several of the phenolics present in fresh grapes and grape juice are also potent antioxidants in various in vitro assays, including several containing biologically relevant lipid substrates, notably human LDL. In fresh grapes and grape juices the polyphenolic compounds are primarily present as glucosides, while the phenolics in wines are principally aglycones. Glycosylation is generally considered to dampen the antioxidant potency of polyphenolics, but the available data on this are conflicting, as the impact of gly-cosylation and in turn antioxidant solubility and partitioning are very system dependent. Depending on the...

Antioxidants from fruits and berries overview

Some studies have evaluated the phenolic contents in fruits at more than one ripening stage. In the case of plums as well as with red grapes intended for wine making, a marked increase in the content of phenolics of potential antioxidant potency was seen in the fully ripe stage in comparison with the less ripe stage.2,3 In contrast, no clear differences were observed in other fruits, e.g. peaches and Antioxidant composition (anthocyanins, flavanols and proanthocyanidins, flavonols, hydroxycinnamates, carotenoids, vitamin C and vitamin E) of selected, commonly consumed fruits and berries is presented in Table 3.1. Large amounts of anthocyanins (up to 8100mgkg-1) are found in the strongly coloured fruits and berries including bilberries (wild clone of blueberries), blackcurrants, cherries, cranberries, red grapes and raspberries. The amount of flavanols is generally below 150mgkg-1 with larger amounts found in blackcurrants, cranberries, red wine grapes, peaches, plums and red...

Plant Originated Glycosidases

Most work has been devoted to grape glycosidases because the first evidence of multiple forms of glycosi-dic flavor precursors was found in this fruit. ft-Glucosidase (55, 56, 69, 67, 68), a-arabinofuranosidase (56, 59), a-arabinopyranosidase (19), a-rhamnopyra-nosidase (56, 69), and ft-xylosidase (51) activities were detected in grapes of various cultivars. The presence of ft-apiosidase in grapes has not yet been confirmed. On the basis of glycosidase activity determinations with pNP-glycosylated substrates, ft-glucosidase activity is considered the most important. Multiple forms of ft-glucosidase exist in grape berries (51, 55, 59) and are also found in almond emulsin (69) but not in papaya fruit (54). The enzyme from papaya fruit, unlike that from grapes, is readily soluble and does not require the use of detergent for extraction.

Plant Pathogenic Bacteria

Glomus mosseae prevented the infection of soybean plants by P. syringae (Shalaby and Hanna 1998), by suppressing the population density of the pathogen in soybean rhizosphere. Li et al. (1997) also found that G. macrocarpum reduced the infection caused by P. lacrymans in eggplant and cucumber, although no positive growth or yield effect was noted, indicating tolerance to the pathogen as a possible mode of action. Inoculation of mulberry with G. fasciculatum or G. mosseae in combination with 60-90 kg of P per hectare per year reduced the incidence of bacterial blight caused by P. syringae pv. mori (Sharma 1995). Inoculation of grapevines with AMF reduced the number of fluorescent pseudomonads on the rhizoplane thereby reducing the incidence of grapevine replant disease (Waschkies et al. 1994). Similarly, a reduction in the colonization of apple seedling rootlets by actinomycetes causing replant disease was reported, while a proportionate increase in root colonization by AMF was noted...

Quality criteria for fresh produce appearance texture flavour and aroma

Many fruits and vegetables undergo colour changes as part of the ripening process. Unripe fruit is usually green (the so-called 'ground colour') and in many types of fruit, the green colour becomes lighter during ripening and maturation owing to breakdown of chlorophyll, for example in apples, grapes, papaya. This may reveal underlying yellow or red pigments (Tucker, 1993). Peel and pulp often undergo different colour changes, as in apples and bananas. In some cases, fruit colour is a strong indicator of eating quality and shelf-life, for example, tomatoes and bananas, whereas in others it is not. Many pre-harvest factors can affect fruit colour independently of other ripeness characteristics. So, for example, the peel of oranges grown in tropical regions may remain green despite having attained acceptable eating quality. Yellowing of green vegetables such as broccoli and spinach will reduce their quality as may browning of cut tissues, for example butt-ends of Brussels sprouts. Other...

Quality deterioration of fresh produce water loss

The speed of post-harvest water loss is dependent primarily on the external vapour pressure deficit however, other factors will influence the situation. Products with a large surface to volume ratio such as leaf crops will lose a greater percentage of their water far quicker than large spherical fruits. The specific structure of the cuticle and the extent of suberisation in the periderm appear to be more important than thickness in improving resistance to the movement of water vapour. Produce varies in the percentage of water which can be lost before quality is markedly reduced. Fruits with thick peels can lose a considerable amount of moisture from the skin without compromising edible quality, for example citrus species, bananas. The appearance of the fruit will, however, deteriorate steadily with increasing water loss. Other thin-skinned fruits are more susceptible to water loss, for example, table grapes (Ben Yehoshua, 1987). Furthermore, dehydration of all products can stimulate...

Maintaining the quality of fresh produce controlled atmosphere CA storage

High levels of CO2 can also have a direct inhibitory effect on certain pathogens. The upper limit for CO2 levels depends on the sensitivity of the crop. Many berry crops have a high tolerance for CO2, for example, blackcurrants destined for processing into juice are often held under 40 CO2. Levels above 15 will significantly reduce incidence of grey mould on strawberries, raspberries, cherries and grapes (Kader, 1997) and small scale CA storage structures are in increasing use with these crops.

Avian Models For Reproductive And Neuroendocrine Aging

Avian reproductive anatomy lends itself well to studies of basic mechanisms controlling female fertility and reproductive aging (Johnson, 2000 Holmes et al., 2003). Most adult female birds have only one functional ovary. Unlike the mammalian ovary, however, in which developing follicles are contained in a capsule, the avian ovary has a lobular structure like a bunch of grapes, with a yolky hierarchy of large preovulatory follicles readily accessible on the outside. This arrangement makes it practical to measure or administer hormones, growth factors or other substances directly from or into individual follicles.

Reduced Representation Sequencing

Not only can plant breeders utilise large sequence collections that reside in the public domain for the selection of candidate markers, but there are also suggestions (in mammalian systems at least) that SNP markers developed in one system may be applicable to other systems (Grapes et al. 2006). The selection of likely candidate SNPs from pig protein coding sequences and their comparison to known human SNPs has revealed that there is a reasonable correlation in gene-to-gene variability across species opening the prospects for site-directed mining of SNPs between species.

Importance To Food Quality And Food Processing

Polyphenol oxidases are very important enzymes in determining the quality and economics of fruit and vegetable harvesting, storage, and processing (17-19). Bruises, cuts, and other mechanical damage during harvest, storage, and processing that allow O2 penetration result in rapid browning in many fruits and vegetables. Up to one-half of some tropical fruits are lost for consumer consumption owing to browning, since the off-color, off-taste, and loss of nutritional quality are unacceptable to consumers. Apricots, apples, peaches, grapes, strawberries, and bananas (among others) and several tropical fruits and juices therefrom become brown, as do Irish potatoes and some lettuces

Significance to humans

Honeyeaters are a conspicuous part of the avifauna, especially in Australia where many species are common in gardens and parks. Several species are regarded as minor pests of grapes and other fruit crops. A few of the larger honeyeaters have been hunted by humans. Feathers from the stitchbird and the Hawaiian honeyeaters were used in Polynesian cloaks. Bell and noisy miners are sometimes culled where they are perceived to be a threat to other birds. Honeyeaters are major pollinators of many native plants. They also disperse seeds, including some exotic weeds. They consequently play an important role in the ecosystems that they occupy.

Yeast Biodiversity In Wineries 21 Yeast Species Diversity During Vinification

Pulcherrima is often present, followed by a group of film-forming yeasts (Pichia anomala) or pigmented species (Rhodotorula sp.). In a general study of yeasts isolated from grapes, however, it was noticed that the profile of yeast species may also vary from region to region (Martini and Vaughan-Martini 1990). Numerous factors affect the total yeast population and the relative proportions of individual species on the grapes. These factors include climatological conditions, the grape variety and the degree of maturity at harvest, the use of fungicides and the physical damage of the grapes (Fleet and Heard 1992). The yeast diversity found in wine-producing regions is strongly related to the quality and organoleptic characteristics of the wine produced from one year to another. However, the most significant finding was that S. cerevisiae is practically absent from grapes and vineyard soils (Martini and Vaughan-Martini 1990). The presence or absence of S. cerevisiae on grapes is the...

Intraspecific Variabilities

The use of active dry yeasts is of particular interest to the wine industry, since the sensory properties of the final product vary considerably from one year to another depending of the microbial flora present on the grapes (Querol et al. 1990). It is generally assumed that indigenous yeasts are suppressed by the starter however, different studies show that indigenous yeasts can still participate in the fermentation (Schiitz and Gafner 1993 Querol et al. 1992a), although an implantation of only 50 was observed when fermentations were conducted by some commercial strains (Esteve-Zarzoso et al. 2000). For these reasons, rapid and simple methods for the routine verification of yeast strain present in fermentations would be useful to check the implantation of the starter.

Frankliniella occidentalis

Western flower thrips and people The western flower thrip is one of the most important pests in the world. Their feeding activities cause serious damage to flower crops, tomatoes, capsicums and cucumbers, as well as stone fruits and table grapes. They also infect many plants with disease as they feed.

Functional Phytochemicals from Cranberries Their Mechanism of Action and Strategies to Improve Functionality

Phenolic compounds or phenolic phytochemicals are secondary metabolites of plant origin which constitute one of the most abundant groups of natural compounds and form an important component of both human and animal diets (1,2,3). These phenolic metabolites function to protect the plant against biological and environmental stresses and are therefore synthesized in response to pathogenic attack, such as fungal or bacterial infection, or high energy radiation exposure, such as prolonged UV exposure (4,5). Because of their important biological functions, phenolic phytochemicals are ubiquitous in plants and therefore find their place in almost all food groups. Common fruits such as apples, cranberries, grapes, raspberries, and strawberries, and fruit beverages like red wine and apple and orange juices, are rich sources of phenolic phytochemicals. In addition to fruits, vegetables such as cabbage and onion, and food grains such as sorghum, millet, barley, peas, and other legumes (6) are...

Online detection of plant stress nonvolatile compounds

As an example, the development and subsequent application of a laser technique specially designed to perform fast and direct analysis of non-volatile compounds in fruits and vegetables, particularly trans--resveratrol in grapes and vine leaves is presented here. The method is based on the combination of LD followed by REMPI and TOFMS detection. The analytical method can be categorised within group (d) mentioned above but it does not use a supersonic beam. It was conceived for intermediate mass resolution (around R 103) at an intermediate level of technical simplicity. 3,5,4'-Trihydroxystilbene (trans-resveratrol) is an antioxidant compound naturally produced in a huge number of plants, including grapes, as a phytoalexin. Figure 12.5 shows its structural formula. In Vitis spp., trans-resveratrol is accumulated in vine leaves and grape skin in response to various fungal organisms, UV radiation or chemicals101,102 and has been found in wines in concentrations depending on viticultural...

Application of plant phytoalexins

To demonstrate this possibility several grape bunches were immersed for 5 s in a water solution of resveratrol (1.6 x 10-4 M). A similar number of bunches were immersed in bidistilled water for the same time period. After this short treatment, the fruits were kept in open air at room temperature. The results obtained with white grapes (Aledo variety) are shown in Fig. 12.11.165,166 The picture was obtained ten days after treatment and significant differences can be noticed in the two set of bunches while the resveratrol-treated bunches still maintained a physical aspect with no sign of losses or deterioration, the untreated ones were not only dehydrated but clearly infected and had deteriorated with local development of fungi. This result opened the way to subsequent investigations of other fruits. In fact, the phytopathogenic fungus B. cinerea can infect a huge range of host plants with no apparent specialisation (berry fruits, horticultural vegetables, monocotyledons, bulbs,...

Dumetella carolinensis

Diet In the spring breeding months gray catbirds are primarily insect eaters, feeding on caterpillars, millipedes, grasshoppers, ants, spiders, and beetles. Starting with summer and into the fall, they start to incorporate more fruit into their diet, preferring grapes and other small fruits. When not foraging under the cover of vegetation, they can be seen walking along the ground using their bills to find insects.

Wine and Juice Production

Even though the amount of -glucans in grapes and fruits is significantly lower than in cereals, cellulases have also found applications in the production of wines and fruit juices where they are used in combination with pectinases and hemicellulases. In wine making, the enzymes are generally used for better skin maceration, improved color extraction, easier must clarification and filtration, and increased wine quality and stability (85). The use of -glucosidases for aroma development from naturally present glucosylated precursors has also been described (86). Macerating enzyme cocktails with cellulases are also used in fruit juice production. In addition, the use of these enzymes offers advantages in the treatment of by products of the fruit industry by improving the extraction yield and the overall process efficiency. Cellulases and hemicel-lulases can be used for the isolation of pectin from citrus fruits to break down the cell walls, increasing the pectin yield. Cellulases can be...

Host Nutritional Effects

Collectively benefit host plants by creating favorable conditions for the proliferation of microflora antagonistic to pathogens such as Phytophthora and Pythium spp. as shown for eucalyptus seedlings by Malajczuk and McComb (1979). Unfavorable conditions induced by AMF colonization resulted in qualitative changes in the mycorrhizosphere that prevented P. cinnamoni sporangial induction in tomato plants (Meyer and Linderman 1986). Proliferation of G. mosseae inside grapevine roots was associated with a significant reduction in replant disease-causing fluorescent pseudomonad inoculum in soil (Waschkies et al. 1994). Promoting AMF diversity that will ensure that at least a component of the AMF community may be active against pathogens can further enhance the benefits of this mechanism.

Use Of Glycosidases For Aroma Enrichment

The use of glycosidases to release flavor compounds from glycosidic precursors, was initially examined in wines. Two major reasons for this are (i) important flavor compounds in wines of Vitis vinifera cultivars are accumulated in grapes as flavorless glycoconju-gates, and especially (ii) the glucose inhibition of ft-glucosidase in available enzyme preparations, limits the use of glycosidases to media, like wine, containing trace levels of glucose ( 1 g L). Nevertheless, because of the occurrence of flavor glycoconjugates in several fruits, enzyme applications have been found for fruit juices. The amount of glycosidic flavor precursors decreases only slightly during grape juice fermentation (145). This phenomenon may be explained by the low levels of glycosidase activities exhibited by grapes (55, 56) and enological yeast strains (80), as discussed previously. Consequently, attention has been focused on the use of commercially available fungal enzyme preparations (pectinases,...

Foodprocessing Properties Of Glycosidases

-Glucosidases from grapes, S. cerevisiae, and C. wickerhamii, are not very stable in these conditions. For example, C. wickerhamii -glucosidase was able to hydrolyse -D-glucosides of monoterpenes in a wine only when the initial pH (3.0) was adjusted to 3.5 or higher (109). Only 10 of initial -glucosidase activity from S. cerevisiae was observed after 90 min incubation (20 C) in a buffer at pH 3.0. (10). This may explain the large decrease in S. cerevisiae -glucosidase activity during grape juice fermentation. In fact the optimum pH stability of the enzyme corresponds to the pH of yeast cells (6.0). This decrease is also observed for a-rhamnosidase and a-arabinofuranosi-dase activities from S. cerevisiae during juice fermentation (10, 80). A -glucosiase from C. peltata was fairly stable at pH 3.5-6.0 (95). The enzyme from a mutant strain of C. molischiana was shown to be more stable at acidic pH than an enzyme from a wild-type strain (110,111). This difference could be explained by...

Conclusions and future trends

The development of new laser-based techniques has had a tremendous impact on plant defence science and consequently on the improvement of natural resistance in fruits. Indeed, the high resolution of these techniques together with their capability to work on-line have made possible plant screening for secondary metabolites with unprecedented sensitivity. This, in turn, has allowed not only the characterisation of genetically modified plants with enhanced resistance to decay, but also the study in real time of the physiology and dynamics underlying the plant-pathogen interaction. Good examples of both types of application have been presented here, namely genetically modified tomatoes which exhibit enhanced antibiotic emission of acetaldehyde and, on the other hand, monitoring of resveratrol in Botrytis infected grapes. resveratrol to grapes and HWRB of various crops are excellent examples of this 'know-how' in post-harvest treatment.

Phenolic Phytochemical Ingredients And Benefits

Phenolic phytochemicals are secondary metabolites synthesized by plants to protect themselves against biological and environmental stresses such as pathogen attack or high energy radiation exposure (1,2). These compounds involved in the plant defense response are one of the most abundant classes of phytochemicals and are also invariably important components of our diets (3,4,5). Commonly consumed fruits such as apples, bananas, grapes, and several types of berries and their beverages are examples of plant foods as sufficiently rich sources of phenolic phytochemicals. Similar phytochemicals in our diet are also obtained from diverse commonly consumed vegetables such as tomato, cabbage, and onions to grains such as cereals and millets as well as legumes such as soybean, common beans, mung beans, fava beans, and peas, depending on the specific regions of the world (4,5,6). In addition many different types of herbs and spices containing phenolic

Utilization Of Laccase In Food

From apple juice (25) and in must and wine (26). Lante et al. (27) also reported the use of laccase as a stabilizer during must and wine processing. Soft rot in some crop plants and gray rot in grapes are a result of Botrytis cinerea infection. The extracellular laccases produced by B. cinerea are apparently involved in pathogenesis

Structure And Occurrence Of Glycoconjugated Flavor Compounds

Some aglycones are already odorous when released from glycosides. They can therefore contribute to the floral aroma of some wines (36, 39), grapes (10, 36, 39), apricots (40), peaches (41), and tea (5, 7, 16, 17). This is the case, for example, of monoterpenes such as gera-niol, nerol and linalol which possess mainly floral attributes and low odor thresholds (100-400 ppb in water) (39).

Methods for Yeast Characterization

Methods by which strains of the same species can be differentiated have been shown to be very important for yeast strain characterization. In winemaking, several studies have analyzed the diverse microflora of grapes and musts and several interesting methods have been developed (Figure 2).

Stone fruits

The extracts of two different varieties of sweet cherries were superior to various berry extracts (blueberries, raspberries, blackberries and strawberries) in inhibiting lipid oxidation in an in vitro phosphatidyl lecitine model system in contrast, the relative antioxidant activities of the same cherry extracts on human LDL oxidation in vitro were lower than that of blackberries and raspberries, but higher than that of blueberries and strawberries when evaluated at the same micromolar concentration of 10 M total phenols.29 The antioxidant activities of phenolic extracts of berries against lecithin liposomes were significantly positively correlated to the content of hydroxycinnamates, but the amount of flavanols correlated to the antioxidant potency of extracts of berries in neither the in vitro LDL oxidation systems nor in the lecithin liposome assay.29 Extracts of sweet cherries were found to be the best among a large number of other fruits in inhibiting oxidation in vitro of a pool...

Peroxidases

Peroxidases (POX, EC 1.11.1.7 see Chapters 28 and 29 for more details) occur widely in nature and is the general name for a group of both highly specific and nonspecific enzymes which use hydrogen peroxide instead of oxygen as an electron acceptor. Peroxidases, especially the heme-containing ones, can catalyze a large number of different reactions including sulfoxidation, N-demethylation, oxidation, and hydro-xylation and hence are of potential interest in the production of specific flavoring topnotes. A recent example involves the demethylation of methyl N-methylanthranilate (ex Citrus) to monomethylanthra-nilate (25). The latter compound is an important topnote flavor in Concord grapes. Soybean, horseradish, and microperoxidases were found to be convenient catalysts for this reaction. In addition POX gives rise to a fresh flavor profile when added to tomato paste (26).

Number

Monkeys and apes make relative numerousness judgments shown by their choice of the larger of two quantities of food. Chimpanzees and orangutans can make such judgments even when the two choices are themselves divided into two groups of objects, suggesting some ability to combine quantities when making the judgment. Discrimination is very accurate for quantities that differ widely from one another, such as five versus two the task becomes more difficult as the numbers get larger and approach one another, such as five and six. If overall mass is excluded as a possible solution by using items that vary in size (such as grapes or different candies), then a number-related cognitive ability is implicated. Most explanations of animals' success at such simple tasks include a non-counting mechanism known as subitizing, which refers to the ability to make quick perceptually based judgments of number. Subitizing is considered to be the likely way that most organisms, including human children and...

Proanthocyanidins

Proanthocyanidins are dimers, oligomers, and polymers of flavan-3-ols and are formed by enzymatic or chemical condensation. These so-called condensed tannins contribute to astringent tastes in fruits (e.g., grapes, peaches, apples, pears, berries etc.), beverages (e.g., wine, cider, tea, beer etc.) and chocolate. At a lower degree of polymerization they are colorless and bitter to taste, but with greater polymerization the taste becomes astringent and the color yellow to brown. Proanthocyanidins purely consisting of catechin and epicatechin monomers are called procyanidins, which are the most common type of proanthocyanidins. Less abundant are the prodelphinidins, which include both epicatechin and gallocatechin monomers.

Babesiosis

Babesiosis is a tick-borne, malaria-like, acute febrile illness caused by the intra-erythrocytic protozoan parasite Babesia. Since the late 1960s, more than 200 cases have been documented in the United States. Almost all of these cases were caused by B. microti and occurred in the coastal regions of southern New England (Cape Cod, Nantucket, Martha's Vineyard, Block Island). Babesiosis has also been reported in Maryland, Virginia, Georgia, Wisconsin, Minnesota, California, and Washington. The mammalian reservoirs are deer and mice and the tick vector is the same as Lyme, Ixodes dammini. the Highest incidence is from May to August.

Red fox

The fox is the sly trickster in the folklore of the Old World. The term sour grapes comes from Aesop's anthropomorphic fox. Predation of chickens has probably been going on for several thousand years, but the nineteenth century brought more conflict as game birds and lambs born in the fields provided food. Foxes have been persecuted by guns, hounds, and poison, but have seldom been exterminated. The sport of fox-hunting in England has ensured the survival of the quarry, and now that the sport is close to banned, the fox's range may contract. A vigorous campaign to control foxes in western Europe so as to limit the spread of rabies, has not eliminated the species.

Nonsulphite dipping

Enzymic discoloration of fresh prepared produce is one of the major causes of quality loss and spoilage during post-harvest handling, processing and storage (Sapers, 1993 Laurila et al., 1998). PPO (EC 1.10.3.1) is the enzyme primarily responsible for the discoloration of fresh prepared potatoes, apples, carrots, parsnips, swede, pears, mushrooms, bananas, peaches, grapes and lettuce, and this discoloration is often the shelf-life limiting quality attribute for these items (Duncan, 1999). PPO activity also results in detrimental changes to the texture and flavour of fresh prepared produce and losses of nutritional quality (Whitaker, 1996).

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