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Natural phytol, CAS 150-86-7, Molecular formula C20H40O. The main component is chlorophyll, which is a branch of plant chlorophyll. It is a colorless or light yellow oily liquid with an aromatic odor, insoluble in water, and soluble in general organic solvents. Chlorophyll is a type of aliphatic alcohol with multiple branched chains, belonging to linear diterpenes. The homeostasis regulation of glucose and lipid metabolism in animals is closely related to the formation of human diseases such as diabetes, obesity and atherosclerosis.
In animal production, glucose and lipid metabolism is also a key factor affecting meat quality traits such as metabolic type conversion, meat color, and intramuscular fat content. Belonging to the class of chain like diterpenes, it is a fatty alcohol containing multiple branched chains. The steady regulation of glucose and lipid metabolism in animals is closely related to the formation of human diseases such as diabetes, obesity and Congee. In animal production, glucose and lipid metabolism is also a key factor affecting meat quality traits such as skeletal muscle metabolism type conversion, meat color, and intramuscular fat content in livestock and poultry.
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Chemical Formula |
C20H40O |
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Exact Mass |
296 |
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Molecular Weight |
297 |
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m/z |
296 (100.0%), 297 (21.6%), 298 (2.2%) |
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Elemental Analysis |
C, 81.01; H, 13.60; O, 5.40 |
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Natural phytol, with the chemical formula C20H40O, is a long-chain fatty alcohol containing multiple double bonds, with a molecular weight of approximately 296.53 g/mol. As a side chain of chlorophyll molecules, chlorophyll plays a crucial role in photosynthesis, but its function goes far beyond that. In recent years, with the deepening of research, the regulatory role of chlorophyll in plant growth and development, environmental adaptation, and non photosynthetic tissues has gradually received attention. This article will systematically elucidate the regulatory role of chlorophyll and its application in biological systems.
Chemical characteristics and biosynthesis of chlorophyll
Chemical Structure:
Leaf green alcohol is a chain like diterpenoid substance composed of four isoprene units, forming a lipophilic fatty chain. This structure makes chlorophyll alcohol lipophilic and able to stably embed into the thylakoid membrane of chloroplasts, providing support for chlorophyll molecules.
Biosynthesis:
The biosynthesis of chlorophyll is mainly carried out in chloroplasts, through the mevalonate pathway (MVA) or the methylerythritol phosphate pathway (MEP). In plants, the synthesis of chlorophyll and chlorophyll is closely related, and the two coordinate with each other during development, jointly affecting the photosynthetic capacity of plants.
The regulatory role in plant growth and development
Chloroplast development and chlorophyll synthesis
Chloroplast development:
Chlorophyll alcohol is one of the key regulatory factors in chloroplast development. In the early stages of chloroplast development, the synthesis of chlorophyll initiates the formation of the chloroplast membrane system, providing sites for the attachment of photosynthetic pigments and enzymes. Research has shown that mutants with defects in chlorophyll synthesis exhibit phenotypes such as delayed chloroplast development and abnormal membrane structure.
Chlorophyll synthesis:
As a side chain of chlorophyll molecules, chlorophenol directly participates in the synthesis of chlorophyll. The supply level of chlorophenol affects the activity of chlorophyll synthase, which in turn affects the accumulation of chlorophyll. Under light conditions, the synthesis of chlorophyll and chlorophyll is positively correlated, jointly regulating the photosynthetic capacity of plants.
Plant hormone signal transduction
Metabolites of chlorophyll, such as phytic acid, participate in the signal transduction of plant hormones. Phytoalkanoic acid can induce adipocyte differentiation, regulate glucose and lipid metabolism, and thus affect the growth and development process of plants. Research has shown that treatment with phytanic acid can significantly improve plant growth rate and biomass accumulation.
Light form construction
Chlorophyll alcohol affects plant photomorphogenesis by regulating chlorophyll synthesis and photosynthetic efficiency. Under light conditions, the synthesis of chlorophyll promotes the development of chloroplasts and the accumulation of chlorophyll, enabling plants to form normal light forms. Under dark conditions, the synthesis of chlorophyll is inhibited, and plants exhibit yellowing.
The regulatory role in the interaction between plants and the environment
Environmental adaptation
light adaptation
Chlorophyll alcohol is involved in plant adaptation to light environment. Under strong light conditions, the synthesis of chlorophyll increases, promoting the accumulation of chlorophyll and enhancing the photosynthetic capacity of plants. Under low light conditions, the synthesis of chlorophyll decreases, and plants adapt to low light environments by adjusting chlorophyll content and photosynthetic enzyme activity.
Temperature adaptation
Chlorophyll alcohol also participates in the adaptation of plants to temperature environments. Under high temperature conditions, the synthesis of chlorophyll increases, stabilizes the chloroplast membrane structure, and protects photosynthetic pigments and enzymes from high temperature damage. Under low temperature conditions, the synthesis of chlorophyll decreases, and plants adapt to the low temperature environment by adjusting membrane lipid composition and photosynthetic enzyme activity.
Resilience
Drought resistance:
Chlorophyll alcohol improves plant drought resistance by regulating chloroplast osmotic potential and membrane stability. Under drought conditions, the synthesis of chlorophyll increases, promoting a decrease in chloroplast osmotic potential and maintaining the stability of chloroplast membrane structure, thereby protecting photosynthetic pigments and enzymes from drought damage.
Salt resistance:
Leaf green alcohol is also involved in the response of plants to salt stress. Under high salt conditions, the synthesis of chlorophyll increases, promoting the regulation of chloroplast osmotic potential and maintaining the stability of chloroplast membrane structure, thereby protecting photosynthetic pigments and enzymes from salt stress damage.
Disease and pest control:
Leaf green alcohol has natural antibacterial and insecticidal activities. Studies have shown that chlorophyllin can inhibit the growth of a variety of pathogens and reduce the incidence rate of plants. At the same time, chlorophyll can also attract natural enemies and insects, helping plants resist the invasion of pests.
Regulatory role in non photosynthetic tissues
Cellular signal transduction:
Although chlorophyll is mainly present in photosynthetic tissues, its regulatory role in non photosynthetic tissues is also gradually receiving attention. Research has shown that chlorophyll may be involved in cell signaling, regulating plant growth, development, and metabolic processes. For example, chlorophyll may affect plant growth and development by regulating the synthesis and signal transduction of plant hormones such as auxin and cytokinin.
Gene expression regulation:
Natural phytol may also be involved in gene expression regulation. Research has shown that treatment with chlorophyll can significantly alter the expression patterns of plant genes, affecting plant growth, development, and metabolic processes. For example, leaf green alcohol treatment can induce gene expression related to photosynthesis and stress resistance, improving the photosynthetic capacity and stress resistance of plants.
Phytol is an unsaturated higher alcohol containing 20 carbon atoms, belonging to the diterpenoid class. It naturally exists in the molecular structure of chlorophyll and is distributed in plants such as jasmine essential oil, tea, and tobacco leaves. As an important chemical raw material, plant alcohols are widely used in the fields of food additives, pharmaceutical intermediates, and skincare products. Their biosynthetic methods have become a research hotspot in recent years, mainly including natural extraction methods, chemical synthesis methods, and biosynthetic methods.
Natural extraction method: directly obtained from chlorophyll
The natural extraction method uses chlorophyll as raw material and separates and purifies plant alcohols through steps such as alkaline hydrolysis and distillation, which is currently the mainstream method for industrial production. The core principle is that the phytol ester bond in chlorophyll molecules is easily broken under alkaline conditions, releasing free phytol. The specific process flow is as follows:
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Raw material pretreatment:
Using silkworm excrement, algae or plant leaves as raw materials, extract chlorophyll with organic solvents such as petroleum ether and ethanol to obtain crude extract.
Alkaline hydrolysis:
Mix the crude extract with sodium hydroxide solution and heat at 80-100 ℃ for 2-4 hours to hydrolyze the ester bond of phytol and generate phytol sodium salt.
Acid neutralization:
Add hydrochloric acid to adjust the pH to neutral, convert sodium phytol into free phytol, and generate sodium chloride byproduct.
Distillation purification:
Through vacuum distillation or molecular distillation techniques, phytol can be separated at 200-204 ℃ (1.33kPa) with a purity of over 95%.
Technical advantages:
Wide range of raw material sources, mature processes, and high product purity.
Limitations:
Requires a large amount of organic solvents and poses a risk of environmental pollution; The chlorophyll content is affected by the season, resulting in poor stability of the raw materials.
For example, the yield of phytol extracted from silkworm excrement can reach 0.5% -1.0%, and the by-product sodium chloride can be recycled for industrial salt production.
Chemical synthesis method: multi-step reaction using farnesene as a precursor
The chemical synthesis method constructs the molecular skeleton of phytol through multiple organic reactions. The core route is to use Farnesene and acetoacetate as raw materials to produce isophytol through condensation, catalytic reduction, and other steps, and then convert it into phytol through isomerization. The specific process is as follows:
Diels Alder reaction: Under Lewis acid catalysis, farnesene undergoes [4+2] cycloaddition with acetoacetate to form a bicyclic intermediate.
Catalytic reduction: Intermediate is hydrogenated under the action of palladium carbon catalyst, reducing double bonds and opening rings to form precursor of isophytol.
Isomerization: Isophytol undergoes isomerization under acidic conditions to produce the target product phytol.
Technical advantages: controllable reaction conditions, high product purity (up to 99% or more); The stereoselectivity can be improved and the generation of by-products can be reduced by optimizing catalysts such as Lindera catalysts.
Limitations: The steps are cumbersome (requiring 5-7 reactions), and the raw material farnesene relies on petrochemicals, which does not conform to the concept of green chemistry; Some reactions require the use of highly toxic reagents (such as cyanide), which poses a safety hazard.
Biological synthesis method: using microorganisms or enzymes to catalyze conversion
The biosynthetic method, which utilizes metabolic engineering to modify microorganisms or enzyme catalysis to achieve sustainable production of phytoalcohols, is currently at the forefront of research. Its core strategy includes:
1. Microbial whole cell catalysis
Constructing a phytol synthesis pathway using Escherichia coli or yeast as chassis cells:
Precursor supply: Isopentene diphosphate (IPP) and dimethylallyl diphosphate (DMAPP) are synthesized through the mevalonic acid (MVA) pathway or the methylerythritol 4-phosphate (MEP) pathway.
Skeleton construction: Using geranyl geranyl pyrophosphate synthase (GGPS) to catalyze the condensation of IPP and DMAPP, producing geranyl geranyl pyrophosphate (GGPP), which is then cyclized by taxane synthase (TXS) to form a taxane skeleton.
Functional modification: Hydroxylation reaction catalyzed by cytochrome P450 enzymes (such as CYP725A4), introducing phytol characteristic functional groups.
Research progress: In 2024, the team of the Chinese Academy of Sciences reconstructed the phytoalcohol synthesis pathway in Saccharomyces cerevisiae, and improved the phytoalcohol production to 120 mg/L by optimizing the precursor supply (introducing the isoprenol utilization pathway) and rate limiting enzyme engineering (site directed mutation TXS), which was five times higher than the initial strain.
2. Enzymatic conversion
Using lipoxygenase (LOX) and lyase to catalyze the conversion of linoleic acid or linolenic acid into phytol precursors:
Oxidative cracking: LOX catalyzes the oxidation of unsaturated fatty acid double bonds to generate hydroperoxide intermediates.
C-C bond cleavage: The cleavage enzyme catalyzes the ring opening of hydrogen peroxide to form aldehyde compounds (such as (Z) -3-hexenal).
Reduction generation: Aldehydes are reduced to phytol under the action of yeast or dehydrogenase.
Technical advantages: Mild reaction conditions (normal temperature and pressure), high stereoselectivity (can selectively synthesize (E) - or (Z) - phytol); The raw materials come from a wide range of sources (including vegetable oil scraps).
Limitations: Enzyme catalytic efficiency is limited by substrate concentration, and efficient immobilized enzyme technology needs to be developed; Intermediate aldehyde compounds are volatile and require optimization of the reaction system (such as using a two-phase reactor).
Technological Challenges and Future Prospects
The current biosynthesis of phytosterols faces three major challenges:
Low efficiency of pathway reconstruction:
Microbial synthesis requires 15-20 enzymatic reactions, and metabolic flow is easily dispersed into by-products (such as OCT, iso OCT).
Poor functional adaptation of P450 enzymes:
Plant derived P450 enzymes have low expression activity in heterologous hosts, and membrane integration and cofactor adaptation technologies need to be developed.
Accumulation of intermediate toxicity:
High concentrations of phytol and its precursors can cause toxicity to cells, requiring the development of efficient transport systems (such as efflux pumps).
Future research can focus on the following directions:
Chassis cell innovation:
Utilizing cyanobacteria (photosynthetic autotrophic) or filamentous fungi (strong secretory ability) as new hosts to improve precursor supply efficiency.
AI driven pathway optimization:
Combining machine learning to predict P450 enzyme mutation hotspots, optimizing metabolic flow allocation through gradient boosting regression models.
Cell free synthesis system:
Integrating cell-free protein synthesis (CFPS) with chemical catalysis to avoid the accumulation of intracellular toxicity.
With the iteration of synthetic biology technology, the green, low-cost, and large-scale production of phytol is expected to become a reality, providing key raw material guarantees for the sustainable supply of vitamin E, vitamin K1, and anticancer drugs such as paclitaxel.
FAQ
What is phytol used for?
Phytol, a diterpene alcohol, which is derived from chlorophyll, is widely used in the fragrance, medicine, and food industry. The MIC value for phytol was found to be 62.5 μg/mL for E. coli, Candida albicans, Aspergillus niger and > 1000 μg/mL for Staphylococcus aureus.
What does phytol do for skin?
Phytol increased the production of pro-collagen-I and hyaluronic acid in cultured human dermal fibroblasts. Immunostaining of skin biopsy confirmed the increased levels of collagen and hyaluronic acid in the dermis of phytol-treated human skin.
What plants contain phytol?
Green tea plants
Known for its grassy scent, phytol can be found in cannabis and green tea plants. Research into the effects of this compound tells us that phytol might be able to help improve anxiety, pain, and inflammation, as well as provide other benefits.
What does phytol smell like?
What does phytol smell like? Known for its grassy aroma, this terpene smells like green tea with some floral and citrus notes.
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