HI 83749

Photometer for Turbidity and Bentonite Monitoring in Wine

Significance of Use BENTOCHECK

The prevention of protein haze or deposit inbottled white wines is a universal concern and often a wine needs to be stabilized before bottling. One commonly used stabilization agent is bentonite. Bentonite is a volcanic clay earth type filling agent (likekaolin). It improves the clarity and stability ofwine but has also negative aspects because of the volume of lees formed, reduction of tannin and color. Since there are different types and qualities of bentonite with different capacity of protein removal, it is important to make laboratory trails with the same lot and wetting degree of the bentonite as that will be used in the cellar.Protein stabilization is normally not a problem in bottled red wines because of the relatively high concentration of phenols that binds and precipitates with the instable proteins before bottling, Often bentonite is added to red wines at a level of about 12 g/hL (1lb/1000 gal), reducing colloidal suspended particles thus improving membrane filterability.Wines with low phenols contents, such asrose, light reds and whites should be checkedfor protein stability before bottling. hanna is offering a rapid test to verify the risk of future protein haze formation. If protein instability is detected, a next test can help defining the right amount of bentonite to be added for improving protein stability. It is important not to overdose bentonite, avoiding stripping wine flavor, body, and significant loss of color, especially in young red wines. Moreover,adding only the necessary amount of bentonite to obtain the desired protein stability is also costs saving.

Ordering information

HI 83749 is supplied with reagents, 1000 µl pipette with2 tips, (4) cuvets, 1 mL graduated syringe, (4) 25 mL grad-uated cylinders, filter papers, cuvet cleaning cloths, 1bottle color removal, cal. kit, funnel, 12 VDC power adapter, (4) 1.5V AA batteries and instruction manual in a hard carrying case.

Solutions and Accessories

Solutions HI 83749-01 Bentocheck solution, 100 mL Accessories HI 93703-58 Silicon oil (dropper) 15 mL HI 83749-11 Calibration Turbidity Kit HI 731331 (4) Glass Cuvets HI 731318 (4) Cuvet Tissues HI 740220 25 mL graduated syringe with stopper HI 731341 1000 µl pipette HI 731351 (25) 1000 µl pipette tips HI 740233 (100) Filter papers type 2 HI 740142P 1 mL graduated syringe HI 740144P (10) 1 mL graduated syringe tips HI 740234 Replacement lamp for turbidity meter HI 92000 Windows® compatible software HI 920005 i-Button® HI 920011 RS232 cable for PC connection HI 920005 5 tag holders with tags HI 731331 Large (4) 10 mL cuvet HI 740027P (10) 1.5V AA batteries HI 740217 Safety shield HI 710005 Voltage adapter from 115V to 12 VDC

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HANNA instruments®

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