Infowine Review Says Longer Red Wine Maceration Can Reduce Color in Finished Wines

A review published Thursday by the wine industry publication Infowine says red wine maceration should be managed to extract the right compounds at the right time, rather than simply pushing for more color and more tannin.

The article, based on recent scientific studies, argues that one of the most common cellar decisions in red winemaking is often treated too narrowly. Maceration, the period when juice stays in contact with skins, seeds and sometimes stems, is not just a way to increase intensity. During that stage, many processes happen at once, including extraction, oxidation, adsorption, aggregation and precipitation. The final wine depends not only on what is in the grape, but also on what remains in solution and in what form.

That distinction matters because a grape’s phenolic potential does not automatically become the wine’s phenolic profile. Even when two lots of fruit start with similar levels of anthocyanins and tannins, they can produce very different wines. The review says cell wall structure, grape variety, phenolic ripeness, temperature, alcohol, cap management and oxygen exposure all shape how much is released and how much is later lost, transformed or stabilized.

Infowine pointed to work by Ferrero and co-authors published in 2025 on Nebbiolo grapes, which described a “phenolic budget” in red winemaking. In that study, macerations carried out at 24°C and 29°C for 12, 18 and 24 days showed that higher temperature improved anthocyanin extraction but also increased degradation. Extending maceration reduced anthocyanin content in the finished wine. The review said that finding is a reminder that extraction alone does not define quality, because some compounds are never released, some are reabsorbed by solids and some break down during fermentation.

The same point applies to color. Anthocyanins, the pigments behind red and purple tones, often rise quickly in the first days of fermentation and then decline. According to the review, that drop does not automatically mean color quality is worsening. Some of those pigments are converted into more stable polymeric forms or take part in copigmentation reactions that help preserve visual intensity over time. For winemakers, the question is not only how much pigment enters the must, but whether it stays in a stable form.

Tannins raise a similar issue. The review says skin tannins and seed tannins are chemically related, but they do not behave the same way in the glass. Seed tannins are often associated with more bitterness and dryness, especially when they are extracted late or from less ripe fruit. A longer maceration, then, does not simply mean “more tannin.” It can change the source of the tannin and the tactile feel of the wine.

Infowine cited a 2025 study by Watrelot and Delchier on cold-hardy red varieties. After 21 days of maceration, Marquette showed higher levels of iron-reactive phenolics without a significant rise in tannins, while Petite Pearl showed limited or even negative effects. The review said that result reinforces a central point for wineries: the duration of maceration on its own is a poor predictor of the final outcome.

The article also stressed the role of grape cell walls and polysaccharides, which can either help stabilize wine structure or work against it. Research by Boulet and colleagues in 2024 and later work on red wine colloids suggest that compounds released from grape solids and yeast can influence color stability, turbidity, astringency and aging potential. In some cases, the same materials that help shape mouthfeel can also adsorb anthocyanins and tannins and pull them out of solution.

For cellar operations, that means common practices such as pumpovers, punchdowns and délestage should not be treated as routine steps with universal effects. Infowine cited two 2025 papers led by Parnigoni that found cap management and mixing strategies can significantly change redox potential, phenolic extraction and sensory properties, with different responses depending on the variety. One of those studies also found that unnecessary air exposure during fermentation can lead to meaningful phenolic losses.

The review said this is especially important because oxygen enters the process through cap work. A pumpover may not only wet the cap and mix the tank; it can also introduce air. If oxygen input is too high, a winery may lose phenolic material it was trying to preserve. The practical implication, according to the article, is that timing and intensity matter as much as frequency.

Infowine also highlighted the use of commercial enological tannins, but said their effect depends heavily on the grape’s anthocyanin profile. In research published in 2020 by Paissoni and co-authors, seed-derived tannins and ellagic tannin formulations did not behave the same way across varieties. Seed tannins had a more visible effect in Nebbiolo and Sangiovese, while ellagic formulations favored pigment polymerization more clearly in Syrah and Aglianico. The review said that argues against the idea of a generic tannin addition for color stabilization.

Enzymes were presented in a similar way: useful in some cases, but not a simple tool for making darker wine. Pectolytic enzyme products can break down grape cell walls and improve release of anthocyanins and tannins. But Infowine said their value depends on the problem a winery is trying to solve, whether that is low extractability, thick skins or poor release from cell walls. It cited research by Osete-Alcaraz and co-authors from 2022 showing that even a clarification enzyme could improve color and phenolic content, and work by Kuhlman and colleagues that linked enzyme use in Cabernet Sauvignon to more astringent wines with more polymerized and galloylated polyphenols.

The review also covered newer extraction technologies, including ultrasound, pulsed electric fields, high pressure, microwaves and ohmic heating. These methods can help increase extraction efficiency or reduce maceration time, especially when wineries want better skin extraction without a long period of seed contact. But the article said they are not general replacements for traditional methods. Their effect depends on grape condition, treatment intensity, scale, energy use and the style of wine a producer wants to make. It noted that pulsed electric fields have a particularly strong technical basis and were authorized by the International Organisation of Vine and Wine in 2020 for use on crushed and destemmed grapes.

Not every winemaking goal calls for more extraction. Infowine said carbonic and semi-carbonic maceration remain useful for producers seeking fresher, fruit-driven wines with lighter tannic structure. Those approaches change the balance between intracellular metabolism, alcoholic fermentation and solid contact, and can be valuable when fruit has potentially hard tannins or when the target is a wine for earlier drinking.

The article said analytical tools should guide those choices, but not replace sensory judgment. Standard cellar controls such as tasting, temperature, density, pH and acidity remain the core of fermentation monitoring. Broader phenolic measurements, such as total polyphenol index, can help track general trends during maceration. UV-Vis spectrophotometry can follow color changes at different wavelengths, while more specialized tools, including HPLC, voltammetry and accelerated aging tests, can give wineries a better picture of anthocyanin composition, redox behavior and likely stability.

Infowine’s review arrives as many producers continue to adjust winemaking protocols to fruit that can vary sharply by variety, site and season. Its main message is that maceration works best when it is treated as a targeted and adaptable process, not a fixed recipe. In practice, that means wineries may have to decide lot by lot whether to push extraction, limit late seed contact, protect against oxygen, use enzymes selectively or stop maceration earlier than a standard schedule would suggest. As grapes move through fermentation tanks, those decisions are increasingly being made with closer monitoring of both chemistry and taste, rather than the assumption that more extraction will always make a better red wine.