CHLOROPHYLL

CAS: 1406-65-1

Chlorophyll (CAS 1406-65-1) is a naturally occurring green pigment found in plants and algae that may be used as a food color additive under certain international food standards and good manufacturing practice conditions.

What It Is

Chlorophyll is a family of closely related natural pigments responsible for the green color of plants, algae, and cyanobacteria and plays a central role in photosynthesis by absorbing light energy. Chemically, chlorophyll molecules consist of a porphyrin ring coordinated with a magnesium ion and a long hydrocarbon tail known as phytol. The CAS number 1406-65-1 refers to chlorophylls collectively as a mixture rather than a single defined chemical entity; common forms include chlorophyll a and chlorophyll b and other minor homologs. Chlorophylls are widely recognized for their characteristic green color and are classified in some international numbering systems as an allowed group of color additives (such as INS 140 in Codex GSFA) under good manufacturing practice (GMP) for foods in specified categories. In confectionery and beverage applications, chlorophyll and its derivatives may provide green hues where permitted. The name "chlorophyll" itself derives from Greek terms meaning "green leaf pigment," reflecting its ubiquity in nature and historical identification as the dominant chromophore in plant tissues. Chlorophyll molecules absorb light mainly in the blue and red regions of the spectrum, making them essential for photosynthesis and natural green color impartation. International standards recognize chlorophylls for their functional use as colorants in foods within strictly defined parameters to ensure consistency with established safety evaluations and consumer expectations. Regulatory frameworks often distinguish between naturally sourced chlorophyll and semi-synthetic derivatives such as chlorophyllin salts, which have different approval statuses and E numbers in various jurisdictions. Sources indicate chlorophylls are included in the Codex General Standard for Food Additives (GSFA) Table 3 provisions, permitting use in certain food categories under GMP conditions, while not universally authorized as a color additive in all countries. These details underscore that chlorophyll is both a biological pigment and a regulated additive with specific applications in the food industry. The identity and status of chlorophyll as a color additive are based on its distinct chemical structure and natural origin, distinguishing it from fully synthetic colorants in regulatory categorization. Given chlorophyll’s natural occurrence and historical use in food coloration, it is often sought as a "clean label" alternative, though its regulatory acceptance varies by region and application context. Codex GSFA inclusion suggests recognition by international food safety authorities for specific uses under GMP criteria.

How It Is Made

Chlorophyll used as a food additive or food ingredient typically originates from plant sources that are rich in chlorophyll pigment, such as leafy greens (e.g., spinach, nettles) and certain algae. In industrial practice, plant biomass is processed to concentrate the chlorophyll fraction. Extraction begins with mechanical disruption of plant tissues followed by solvent extraction, often employing organic solvents such as ethanol, acetone, or hexane to solubilize the lipid-soluble chlorophyll molecules. The extraction step separates the pigment-rich solution from insoluble plant material. After extraction, the solvent is removed by evaporation under reduced pressure to yield a concentrated chlorophyll extract. Further purification steps can include filtration, phase separation, or chromatography to reduce impurities and concentrate the desired chlorophyll fraction. Some commercial preparations involve stabilization of chlorophyll by forming complexes with metals such as copper to yield chlorophyllin derivatives; however, those derivatives have distinct regulatory identities and approval conditions. For natural chlorophyll preparations themselves, drying and milling steps convert extracts into powder forms suitable for incorporation into food formulations. Water-dispersible forms may be created by combining chlorophyll with carriers such as gum arabic or maltodextrin to facilitate suspension in aqueous food matrices; these carriers do not alter the core pigment but improve handling and functional performance. Quality control during processing focuses on verifying pigment content, color consistency, and absence of contaminants. The extraction and refinement methods aim to preserve the native structure of chlorophyll while removing non-color components. Industrial-scale production of chlorophyll extracts is governed by good manufacturing practices, with specifications tailored to intended food uses. Given chlorophyll’s sensitivity to light, heat, and pH, manufacturers often control processing conditions to minimize degradation and maintain vibrant green color. The result is a concentrated, stable pigment preparation that can be used under permitted food additive standards where applicable. Although processing methods vary by producer and source material, the general approach involves plant-derived extraction and downstream purification to yield a food-grade pigment that aligns with regulatory specifications for use as a natural colorant.

Why It Is Used In Food

Chlorophyll is used in food primarily for its ability to impart or enhance green color, a desirable attribute in many food products where visual appeal influences consumer perception. Color plays a critical role in how people judge freshness, ripeness, and expected taste qualities, and green hues are often associated with vegetables, herbs, and other plant-derived foods. Food formulators may turn to chlorophyll or chlorophyll-rich extracts when they need a natural alternative to synthetic green colorants to meet market demands for clean-label or plant-based ingredients. The use of chlorophyll aligns with consumer preferences in segments emphasizing natural ingredients and minimal processing. In practice, chlorophyll can be added to products such as beverages, dairy products, confections, and sauces to achieve subtle to vibrant green tones, depending on concentration and formulation. Because chlorophyll is oil-soluble, its incorporation into food systems often involves carriers or emulsifiers to improve dispersion, especially in water-based products. In addition to coloration, chlorophyll-rich extracts may contribute minor sensory notes that complement green-tasting products, such as vegetable juices or herbal-infused foods. Food technologists consider chlorophyll alongside other natural colorants when balancing color intensity, stability, and regulatory compliance. Although chlorophyll itself does not provide flavor enhancement in the traditional sense (sweet, salty, sour, bitter, umami), its presence can influence the overall sensory profile by reinforcing associations with freshness when paired with herbal or vegetable flavors. The popularity of natural colorants stems from both regulatory trends and consumer demand; as a naturally occurring pigment, chlorophyll fits into formulation strategies where synthetic dyes are restricted or where labeling transparency is a priority. Use of chlorophyll in foods must adhere to applicable food additive standards, which dictate permitted categories and conditions of use under good manufacturing practices. Within these constraints, food developers can leverage chlorophyll to achieve visual and marketing objectives while maintaining compliance with international food safety norms. As with any colorant, considerations such as light and pH stability, interaction with other ingredients, and processing conditions influence its selection and application in specific food products. The functional role of chlorophyll in food extends beyond mere color, as its presence may signal plant-derived content to consumers and support positioning of products within natural or organic segments.

Adi Example Calculation

To illustrate how ADI assessments may be interpreted for a food additive like chlorophyll, consider a hypothetical adult with a body weight of 70 kg. If regulatory evaluations indicate that an additive has an ADI of "not specified," this means that expected exposures under good manufacturing practice conditions are not anticipated to pose safety concerns, and a numerical ADI is not formally established. In contrast, for additives with specified ADIs, one would multiply the numeric ADI (in mg per kg body weight) by the body weight to estimate the maximum daily intake considered safe. For example, if an additive had an ADI of 0.5 mg/kg body weight, the calculation for a 70 kg adult would be 0.5 mg/kg * 70 kg = 35 mg per day as the maximum amount without appreciable risk. With chlorophyll’s ADI described as "not specified," a direct numeric calculation is not applicable, but the concept underscores that safety assessments consider both body weight and expected use levels.

Safety And Health Research

Safety evaluations of chlorophyll as a food additive focus on its potential for exposure through diet and the existing toxicological data available from studies of chlorophylls and related compounds. International expert committees, such as those associated with the Joint FAO/WHO Expert Committee on Food Additives (JECFA), have reviewed chlorophylls in the context of food additive safety, often classifying them in categories where an acceptable daily intake (ADI) may not be specified when evidence does not indicate safety concerns at typical use levels under good manufacturing practice. These evaluations consider data on absorption, metabolism, and elimination, as well as any genotoxicity or long-term toxicity studies available in the scientific literature. Researchers have also studied chlorophyll’s behavior in biological systems, including its stability under conditions of digestion and processing. While chlorophyll itself is a natural component of plant-based foods commonly consumed in diets worldwide, the exposures from added chlorophyll preparations in processed foods may differ quantitatively, so regulators analyze available data to ensure that use as a food additive does not pose undue risk. Animal studies have historically been part of safety assessments, examining endpoints such as acute toxicity, subchronic exposure effects, and potential for organ-specific impacts. In addition to pigment-specific assessments, derivative compounds like chlorophyllins undergo separate evaluations due to differences in chemical structure and solubility. Human data on chlorophyll additive intake are limited, and most safety conclusions derive from established toxicological frameworks that apply conservative assumptions and safety factors when extrapolating from animal data. The focus of safety research remains on whether chlorophyll used as a food color additive could contribute meaningfully to adverse effects at anticipated intake levels, with current evidence supporting use under regulated conditions. Ongoing research may explore new data on chlorophyll’s metabolic fate and potential interactions with other dietary components, but regulatory evaluations emphasize adherence to approved use conditions rather than health claims beyond coloration. Overall, safety assessments aim to ensure that chlorophyll’s inclusion in foods does not elevate risk when compared with typical dietary exposure from naturally chlorophyll-rich foods.

Regulatory Status Worldwide

Chlorophyll’s regulatory status varies by jurisdiction, reflecting differing approaches to color additive authorization and food additive standards. Internationally, codified standards such as the Codex General Standard for Food Additives (GSFA) include chlorophylls in Table 3 provisions, permitting their use under conditions of good manufacturing practice in specified food categories. These provisions outline where and how chlorophyll may be applied, subject to compliance with broader safety and labeling norms. The GSFA’s inclusion of chlorophylls acknowledges international expert evaluations that support their safety for use as a food color under defined conditions, though specific maximum levels may be indicated for certain categories. By contrast, in the United States, chlorophyll per se is not listed among color additives authorized in 21 CFR Part 73 or related sections, and Substances Added to Food (formerly EAFUS) notes that color additives require explicit regulation for use; chlorophyll’s status as a permitted colorant in the U.S. is not established in the CFR. In the European Union, chlorophylls and related compounds such as chlorophyllins may have E numbers (such as E140) and permitted use in certain food categories, with regulatory frameworks specifying quantum satis conditions and functional designations. National and regional regulatory bodies conduct their own evaluations, and the presence of chlorophyll on international lists like Codex GSFA does not automatically equate to approval in every country. Food manufacturers seeking to use chlorophyll must navigate these varying regulatory landscapes, ensuring that proposed applications align with the specific legal frameworks in target markets. Compliance often involves documenting adherence to good manufacturing practice and demonstrating that finished products meet relevant labeling and safety requirements. Regulatory reviews consider toxicological data, historical use, and available exposure information to support decisions on food additive status. The differing statuses across jurisdictions highlight the importance of understanding both international standards and local regulations when formulating foods with chlorophyll.

Taste And Functional Properties

Chlorophyll itself is not typically used for flavoring but can have subtle sensory characteristics that may influence the perception of products in which it is used. Pure chlorophyll extracts may carry a mild green, herbaceous note when present at higher concentrations, reflecting the sensory profile of the plant material from which they are derived. In many food formulations, chlorophyll is incorporated at levels that contribute predominantly color rather than taste, and any trace organoleptic impact is managed by balancing with other ingredients. Functionally, chlorophyll molecules are lipophilic and inherently more soluble in non-polar media; this solubility profile influences how they are formulated into foods. In water-based products, chlorophyll preparations are often delivered with carriers or emulsifiers that facilitate suspension or dispersion, enabling the pigment to distribute evenly without significantly altering texture or mouthfeel. Chlorophyll’s stability can be affected by processing conditions such as heat, light, and pH; exposure to strong acidic environments or prolonged heating may cause degradation or color shifts toward brownish tones. In practice, product developers account for these sensitivities when designing formulations to retain desired green hues throughout shelf life. The interaction of chlorophyll with metals can also influence its functional behavior; for example, metal complexes such as chlorophyllin derivatives exhibit different solubility and stability profiles compared to native chlorophyll. Although those derivatives are processed forms with distinct regulatory classifications, they illustrate how metal coordination can affect pigment properties. Chlorophyll’s functional attributes extend to compatibility with other natural colorants when used in combination to achieve specific shades or to balance against pH-induced changes. In addition to aesthetic contributions, chlorophyll-based pigments may interact with light and oxygen, sometimes acting as antioxidants in certain matrices, though regulatory frameworks do not typically authorize use for antioxidant purposes unless explicitly evaluated. Sensory assessments often guide final formulation choices to ensure chlorophyll’s presence enhances color appeal without introducing undesirable sensory notes. Overall, chlorophyll’s primary functional property in foods is its ability to deliver natural green coloration, with secondary sensory and stability characteristics shaped by formulation context and processing conditions.

Acceptable Daily Intake Explained

The concept of an acceptable daily intake (ADI) is central to how food safety authorities manage the use of additives, including chlorophyll. An ADI represents the amount of a substance that can be ingested daily over a lifetime without appreciable health risk, based on toxicological data and safety factors used in risk assessment. For naturally occurring pigments like chlorophyll, some expert committees have concluded that an ADI does not need to be specified when evidence does not indicate safety concerns at levels consistent with good manufacturing practices. This conclusion reflects both the long history of human exposure to chlorophyll through plant foods and toxicological evaluations that have not identified adverse effects at low intake levels typical of dietary colorant use. In practice, when a food additive’s ADI is described as "not specified" or similar in safety evaluations, it means that estimating a numerical ADI was unnecessary based on the available evidence and expected exposure. Regulatory decisions on chlorophyll’s ADI status take into account factors such as the chemical’s natural occurrence, metabolic pathways, and data from studies examining potential toxic effects. Although consumers encounter chlorophyll primarily through consumption of green vegetables and plant foods, added chlorophyll in processed foods introduces additional exposure; however, regulatory reviews that establish "not specified" ADI interpretations conclude that use at GMP levels does not meaningfully increase risk. It is important to clarify that ADIs are not recommended intake levels but rather conservative benchmarks used by regulators to set allowable use conditions and evaluate safety. The framework surrounding ADI determinations ensures that chlorophyll’s use as a food additive remains within safety margins supported by scientific evaluation.

Comparison With Similar Additives

Chlorophyll shares functionality with other natural colorants used to impart green or related hues in foods, such as spirulina extract and lutein. Spirulina extract, derived from blue-green algae, provides greenish-blue to green color and is permitted in many jurisdictions as a natural colorant; like chlorophyll, it must be used under good manufacturing practices and may have distinct E or INS numbers. Spirulina’s color stability and solubility properties differ from chlorophyll, leading formulators to choose one over the other depending on pH conditions and product matrix. Lutein, another plant-derived pigment, typically yields yellow to orange hues rather than green; it is used in products where those tones are desired and has its own regulatory approvals. Compared with synthetic green colorants like Brilliant Blue combined with Yellow dyes to achieve green, chlorophyll offers a natural-origin alternative but may present limitations in stability under certain processing conditions. Formulators weigh these differences, considering factors such as color strength, pH sensitivity, and regulatory acceptability. Natural red colorants like cochineal extract serve similar consumer demand for plant-based additives but deliver very different hues. Evaluating chlorophyll alongside other natural pigments illustrates the diversity of options available for color formulation while also highlighting specific technical and regulatory considerations unique to each additive.

Common Food Applications Narrative

Chlorophyll and chlorophyll-rich extracts find application in a variety of food products where green coloration is a desired characteristic. Beverage products such as flavored water, fruit juices with vegetable blends, and ready-to-drink teas or herbal infusions can incorporate chlorophyll to enhance or restore green hues that consumers associate with freshness and plant-derived ingredients. Confectionery products, including sugar-coated candies and gummies, may leverage chlorophyll to signal green fruit or herbal flavors visually, often complementing taste profiles that evoke mint, lime, or other natural green notes. Dairy products like flavored yogurts and ice creams can also incorporate chlorophyll when crafting unique flavor offerings that emphasize botanical or vegetable components. Sauces and dressings, especially those designed to accompany salads or fresh produce, may use chlorophyll to reinforce visual cues linked to leafy greens and herbs. In the realm of bakery and snack items, fillings, icings, or coatings may be colored with chlorophyll to align with seasonal themes or to differentiate product lines aimed at consumers seeking natural colors rather than synthetic dyes. Tea blends and herbal infusions can benefit from chlorophyll’s green tones to evoke sensory associations with plant authenticity and quality. Chlorophyll’s role in prepared foods intended for specific nutritional uses, such as dietary supplements or products highlighting vegetable-derived nutrient content, also aligns with consumer expectations for clean-label ingredients. Within the spectrum of food categories, chlorophyll’s inclusion is governed by standards that allow its use under conditions of good manufacturing practice in selected foods. Developers weigh technical considerations — such as pH sensitivity and light exposure — during processing to preserve the intended color effect throughout production, packaging, and shelf life. The variety of food applications for chlorophyll underscores both its functional utility as a natural colorant and market interest in plant-based ingredient solutions.

Safety & Regulations

FDA

  • Notes: U.S. color additive status not established in CFR; explicit approval for chlorophyll as a food additive is not identified in available sources.

EFSA

  • Notes: EFSA has evaluated chlorophylls and related compounds; specific numeric ADI not established in sources reviewed.
  • E Number: E140

JECFA

  • Notes: JECFA evaluations indicate an ADI not specified interpretation; no numeric value confirmed from deep link.
  • Ins Number: 140
  • Adi Display: ADI not specified

Sources

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