1 / 14

Introduction to Grape Wine: Production, Processing, and Common Problems

Learn about grape wine production, processing, and the common problems encountered during the winemaking process. Discover the steps involved in fermentation, determining alcohol content, and the potential for local and international marketing.

thomassjackson
Download Presentation

Introduction to Grape Wine: Production, Processing, and Common Problems

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Grape Wine Next

  2. Introduction Grapes are cultivated in many countries of the world. India produces only about 2.77 per cent of the total world production. However, in productivity India stood first with 23.50 tonnes /Ha. Grape is one of the most perishable fruits and during the process of distribution and marketing, substantial losses are incurred which ranges from a slight loss of quality to total spoilage. Processing is an alternative method of preservation of this fruit for long durations. Fermentation of juices for the preparation of alcoholic beverages is being practiced for the last many centuries. Wine is a fermented beverages produced from grape and has a large acceptability across the world and has immense potential for local marketing as well as export.

  3. Alcoholic Beverages These are the beverages which are prepared after alcoholic fermentation of sugars by yeast, contain varying amounts of ethyl alcohol (5-42%), and are consumed directly or after dilution in water. Wine Product made by alcoholic fermentation of grapes or grape juice unless otherwise specified, by yeast (Saccharomyces cerevisiae and a subsequent ageing process. Alcohol content is 11-14 %, but may be as low as 7 %.

  4. Definitions Fortified wines Contain added alcohol/ distillate of wine (brandy). Alcohol content of fortified wines is 19-21% Table Wines Low alcohol content and little or no sugar Dessert Wines These are fortified sweet wines.

  5. Source: Sharma (2010)

  6. Red table wine Nutritional value of red table wine

  7. Process for preparation of wine

  8. Steps in wine making Source: http://www.softchalk.com/lessonchallenge09/lesson/wineTutorial/wineTutorial4.html

  9. Determination of alcohol content ?Record starting specific gravity of must (S1), Record finished specific gravity (S2) Calculate by using the formula

  10. What happens during fermentation? Yeast Saccharomyces cerevisae, which causes fermentation, is a single cell organism that converts the sugar in the fruit to alcohol and carbon dioxide. The carbon dioxide escapes into the air and what is left is wine.

  11. Wine Making Problems • The major cause of wine failures is a lack of proper sterilization  procedures and practices. Important Problems encountered are: • Corkiness • Symptoms: An unpleasant flavor in wine • Possible Causes: • Bottling with a defective cork • Not a complete seal and the outside air allowed to enter into the bottle • Inferior cork • 2. Soapiness • Symptoms: Soapy taste in your favorite wine • Possible Causes: • Equipment, carboys and Fermenters not properly cleaned and rinsed.

  12. Wine Making Problems • Woody • Symptoms: Aroma of wood in your wine. • Possible Causes: • Over-soaking of corks • Over-aging with oak chips • 4. Flowers of Wine • Symptoms: A white film or skin that forms on the surface of wines • Possible Causes: • Undue exposure to air

  13. Wine Making Problems • 5. Stuck Fermentation • Symptoms: Wine has stopped fermenting before reaching a specific gravity of 0.994 - 0.996 • Possible Causes: • cold temperatures / too hot • Bad yeast, using a yeast that's reached its limit of alcohol tolerance • Too much sugar • Insufficient nutrients or acids • Insufficient oxygen • Too much carbon dioxide • Remedy: Add a high powered yeast

  14. Let us sum up • Wine is a product made by alcoholic fermentation of grapes or grape juice unless otherwise specified, by yeast (Saccharomycescerevisiae and subsequent ageing process. Alcohol content is 11-14 %, but may be as low as 7 %. • Fortified wines contain added alcohol or distillate of wine while sweet wines consist of unfermented sugar. • Ethyl alcohol and CO2 are produced during fermentation • Alcohol content is calculated by dividing the difference between initial and final specific gravity by 7.36. • Corkiness, soapiness and flower of wines are problems of wine making.

More Related