Effect of the Water Feeding Onto the Brew and the Filter Cake Using a Household Coffee Maker
M. EULITZ, I. KLLING-SPEER AND K. SPEER Food Chemistry - Technische Universitt Dresden, Bergstrasse 66 - 01069 Dresden, Germany SUMMARY The household coffee maker Melitta Look de Luxe allows the consumer to prepare a mild or a strong coffee brew by feeding the water through numerous small jets or through one main jet. The effects on the beverage and on the composition of the filter cake were exemplarily determined by analysing the lipophilic component cafestol and the water soluble component caffeine. Regarding the strong brew, the caffeine content was about 10 % higher than in the mild brew whereas the cafestol content with 1.8 mg/l was twice as high as in the mild brew with 0.9 mg/l. The concentrations of cafestol and caffeine in various regions of the filter cakes were also divergent depending on the regulated water feeding. INTRODUCTION Nowadays, the consumer has the option to select a household coffee maker from a large number of machines by different manufacturers. However, only a few of them permit feeding the water individually, such as the Melitta Look de Luxe with its two different settings for preparing either a mild or a strong brew or any desired brew in-between. In our study, the effects of these two different water feedings on the beverages were investigated. In addition to the water-soluble component caffeine, cafestol as a related component of the lipid fraction with physiological properties was analysed. Furthermore, samples were taken from various parts of the moist filter cake as well as from the surface of the filter paper.

mglichst im Original-Karton mit der ausgefllten Garantiekarte (siehe Verpackung) und dem Kaufbeleg sowie der Beschreibung der Beanstandung an den Melitta Zentralkundendienst oder einen der autorisierten Fachhndler. 6. Die Ansprche aus dieser Garantie verjhren sptestens 30 Monate nach Kaufdatum. 7. Weitergehende Ansprche jeglicher Art insbesondere Schadensansprche einschlielich Folgeschden sind ausgeschlossen, soweit nicht eine Haftung des Herstellers gesetzlich zwingend vorgeschrieben ist. Die Gewhrleistungsansprche des Verbrauchers aus dem Kaufvertrag mit dem Verkufer werden durch diese Garantie nicht berhrt. Melitta Haushaltsprodukte GmbH & Co. KG Ringstrae 99 D-32427 Minden
Zentralkundendienst Deutschland Melitta-Zentralkundendienst Ringstrae Minden Ersatzteilbestellung: Tel: 05 71/86-/3 Fax: 05 71/10 sterreich Melitta Ges. mbH & Co. KG Mnchner Bundesstrae Salzburg Schweiz Melitta GmbH, Abt. Kundendienst 4622 Egerkingen Tel: 062 / 98 30
Before preparing first cup of coffee
! Read operating and safety instructions carefully! ! Check voltage in your home (has to correspond with information at the bottom of the coffeemaker) ! Clean coffeemaker by two complete brewing processes only with clear water (without coffee)

Cleaning and maintenance

! Before cleaning always remove plug from socket ! Never immerse appliance or cord in water Use a soft damp cloth and washing-up liquid to clean the exterior. Glass jug and filter insert are dishwasher-proof. Descaling Regularly descaling ensures perfect operation we recommend to descale the appliance after every 40 filtrations. Use Swirl Bio Descaler or Swirl Quick Descaler.

Guarantee

For this coffeemaker we shall grant a guarantee according to the following conditions: 1. The guarantee generally runs for a period 24 months from the date of purchase.The guarantee comes into force only, if date of purchase is confirmed by the dealers stamp and signature on the guarantee card or by submission of the corresponding proof of purchase/ receipt. 2. Within the guarantee period we will eliminate any defects which are existing already from the time of buying in the appliance resulting from faults which be proved against us in material and/or workmanship either by repairing or exchanging defective parts or exchanging the whole appliance.The complaint has to be advised to us within 4 weeks after detection.The guarantee period for the appliance will not be extended by the submission of the claim under guarantee. Exchanged parts will become property of the manufacturer.The customer will not be billed for freight, packaging or other incidental costs resulting from a claim under guarantee. 3. Damages which are not under responsibility of the manufactorer are not covered by the guarantee.This is valid especially for claims arising from improper use (e.g. operation with wrong type of current or voltage) or maintenance as well as from normal wear and tear. Moreover the guarantee does not cover claims resulting from calcification (for descaling hints look into the users manual), glass breakages or faults which have only a negligible effect on the value or operation of the appliance. 4. The guarantee becomes void if repairs are carried out by third parties which are not authorized by the manufacturer to do so and/or if spare parts are used other than the original ones. 5. This guarantee is valid only in the country where the appliance was bought. In case of claim under guarantee, please return the complete appliance preferably in the original box.

Coffee Preparation

1. Insert plug cord can be lenghtend or shortened by using the cable storage () 2. Open the filterlid (); LOOK de luxe: Open the filterlid by pressing it () 3. Fill in needed amount see scale at watertank or glass jug () of cold water into the watertank () 4. Fold filterbag 1 x 4 () and place it in the filter () 5. Scoop the ground coffee into the filterbag. Recommendation: per cup 1 coffeemeasure = 6g 6. Close the filterlid; LOOK de luxe: choose personal coffee taste from mild to strong by using the Aroma-Selector () 7. Place glass jug into the appliance. Drip-stop () is activated () 8. Switch on the appliance on/off switch lights up () 9. As long as the appliance is switched on, the warming plate keeps the coffee warm. LOOK de luxe: is equipped with an auto-shut-off function appliances shuts off after 2 hours automatically. It is advisable for best coffee taste not to keep coffee warm for more than 30 minutes. 10.Switch appliance off between two brewing cycles and leave it to cool down for approx. 5 minutes
with the filled-in guarantee card (see box) and the proof of purchase/receipt as well as a description of the fault to the Melitta Customer Service Centre, to an authorized Service Centre or your approved dealer. 6. The entitlement out of this guarantee comes under the statute of limitation 30 months after date of purchase at the latest. 7. All other claims particularly claims for damages and compensations for consequential damages resulting from this guarantee are excluded unless the liability of the manufacturer is laid down by binding law.

Safety instructions

! When the appliance is switched on, some parts (e.g. the warming plate) become hot. Do not touch risk of burning! ! Always keep appliance out of the reach of children ! Never allow the cord to come into contact with the warming plate ! Always pull the plug out of the socket before cleaning or in case of absence for a long time ! Never immerse the appliance in water ! Glass jug is not microwave-proof ! Do not use hot water. Only fresh, cold water should be used to fill in the watertank ! Do not open the filter lid during the coffee brewing process ! The replacement of the cord and all other repairs must be carried out by authorized Melitta Customer Service Centres only or by a person of similar qualification