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Finings〔The term is a mass noun rather than a plural.〕 are substances that are usually added at or near the completion of the processing of brewing wine, beer, and various nonalcoholic juice beverages. Their purpose is for removal of organic compounds; either to improve clarity or adjust flavor/aroma. Specifically, the removed compounds may be sulfides, proteins, polyphenols, benzenoids, or copper ions. Unless they form a stable bottom sediment in the final container, the spent finings are usually discarded from the beverage along with the target compounds that they capture. Historically, various substances such as egg whites, blood, milk, isinglass, and Irish moss have been used as finings. These are still used by some producers, but more modern substances have also been introduced and are more widely used, including bentonite, gelatin, casein, carrageenan, alginate, diatomaceous earth, pectinase, pectolyase, PVPP (Polyclar), kieselsol (colloidal silica), copper sulfate, dried albumen, hydrated yeast, and activated carbon. ==Actions== Their actions may be broadly categorized as either electrostatic, adsorbent, ionic, or enzymatic. The electrostatic types comprise the vast majority; including all but activated carbon, fining yeast, PVPP, copper sulfate, pectinase and pectolase. Their purpose is to selectively remove proteins, tannins (polyphenolics) and coloring particles (melanoidins). They must be used as a batch technique, as opposed to flow-through processing methods such as filters. Their particles each have an electric charge which is attracted to the oppositely charged particles of the colloidal dispersion that they are breaking. The result is that the two substances become bound as a stable complex; their net charge becoming neutral. Thus the agglomeration of a semi-solid follows, which may be separated from the beverage either as a floating or settled mass. The only adsorbent types of finings in use are activated carbon and specialized fining yeasts. Although activated carbon may be implemented as a flow-through filter, it is also commonly utilized as a batch ingredient, which later must be separated and discarded from the beverage. It can completely/partially remove benzenoid compounds and all classes of polyphenols non-specifically, decolorizing and deodorizing juices and wines. Traditionally, yeast fining has involved the addition of hydrated yeasts used as adsorption agents. Consisting of approximately 30% protein, yeast cell walls have a chemical affinity with wine compounds, such as those that may be polyphenolic or metallic. Indeed, yeast fining is a practical means of removing excess copper ions (greater than 0.5 mg/L) when copper sulfate is used to bind selected volatile sulfur compounds (VSCs).〔Wine/Enology Notes #85, by Bruce Zoecklein, 22 Jan 2004, Virginia Cooperative Extension Service ()〕 The ionic finings are copper sulfate and PVPP. When dissolved in aqueous beverages, copper sulfate's copper ions can chemically bind undesirable sulfides. The resulting complexes must be removed by other finings. The action of PVPP appears to be through the formation of hydrogen bonds between its carbonyl groups and the phenolic hydrogens of the polyphenols. It attracts the low molecular weight polyphenols rather than the condensed tannins and leucanthocyanins that are removed by gelatin.〔(Fining & Clarifying Agents, by Terry Rayner )〕 The enzymatic finings are pectin and pectinase. They aid in destroying the large polysaccharide molecule named pectin, which otherwise causes haze in fruit wines and juices. They are among the few finings that are added before juices are fermented. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「finings」の詳細全文を読む スポンサード リンク
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