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In scientific history, 1-Aminocyclopropanecarboxylic acid (ACC) didn't get much attention outside plant biochemistry circles until researchers discovered its role as the immediate precursor to ethylene in plants. That single revelation opened a door: suddenly, chemists, botanists, and those with their roots in agricultural science saw ACC not just as a minor amino acid but as a pivotal player in plant growth and stress response. Through the years, as labs refined analytical methods and molecular biology tools, folks started mapping out how ACC fed into a wider biochemical network, highlighting its relevance in understanding plant life cycles far beyond basic organic chemistry.
ACC ranks high among non-proteinogenic amino acids for anyone who digs into plant physiology. It’s not just another compound in a bottle—this stuff sets off chain reactions that influence when fruit ripens, how roots twist toward the earth, even how plants defend themselves under tough conditions. In agriculture and research, having reliable batches of ACC supports countless experiments that push our grasp of plant biology forward. Lab suppliers usually offer ACC in powder or crystalline form so researchers have enough flexibility, whether they’re aiming for precise dosing in hydroponic tanks or mixing it up in complex growth media.
Set beside classic amino acids like alanine or glycine, ACC’s cyclopropane ring throws a twist into the molecular mix. This rigid three-membered ring keeps it physically compact. It holds a white crystalline look, dissolves well in water, and doesn’t shy away from modest heat. Chemically, that strained ring structure challenges even seasoned synthetic chemists, influencing reactivity both in the lab and inside cells. With a melting point over 200°C, stability under storage looks pretty good, so researchers can order it in bulk and not worry about speedy spoilage.
If you grab a bottle of ACC, labels usually spell out purity—most labs want over 98%—and always flag whether traces of contaminants or solvents hang around after manufacture. Because trace impurities skew sensitive plant biology experiments, technical specs include details on optical rotation, solubility, molecular weight, and storage advice, all crucial for reproducibility in experiments. Regulations haven’t kept the same pace as those for industrial chemicals or food additives, but top-tier suppliers still meet internal quality standards before shipping to research institutions.
The commercial route for ACC production often leans on using protected glycine derivatives, harnessing cyclization steps that demand careful control of pH, catalyst, and temperature. Some labs still go the old route with classical Curtius rearrangement or via N-protected amino acid precursors, though these older approaches clog up with by-products and waste. Recent advances, including biocatalytic synthesis using engineered enzymes, promise to reduce hazardous waste while potentially cutting costs over time, and more eco-conscious manufacturing is gaining favor as environmental accountability enters industry conversations.
ACC’s chemistry centers on its cyclopropane ring and amino group. That quirky ring, under specific conditions, can spring open, setting the stage for creating cyclobutane or linear compounds. In living plants, ACC oxidase converts it into ethylene, a gaseous plant hormone. Back in a synthetic lab, some teams tweak the carboxyl or amino groups to design analogs either for safer handling or deeper biochemical probing. These modifications aren’t just technical—changing ACC’s structure sometimes helps track metabolic pathways or create new herbicides that slow ethylene formation where crop shelf life matters.
ACC has built up a list of synonyms in literature—cyclopropane-1-amino-1-carboxylic acid stands out, while old bench chemistry texts refer to it casually as "Aminocyclopropanecarboxylate". Chem catalogues also list it by various abbreviations, so researchers swapping protocols often double-check identity numbers to avoid costly mix-ups. That catalog variety reflects decades of global academic research, each project naming it in line with their own traditions.
Working with ACC in a laboratory rarely invites the kind of strict hazard protocols that big industrial chemicals do, but open containers or spilled powder can irritate eyes and skin. Trained lab workers know to glove up and use fume extraction when handling even small batches. Some studies highlight its breakdown products in soil, so researchers who use it outside in field trials must stay aware of any lasting after-effects. Many universities and research institutes run internal reviews to ensure work with ACC supports both researcher safety and environmental stewardship.
ACC’s claim to fame sits squarely in plant biology. Adding it to root systems helps tease out how crops manage drought, infection, or crowding stress. Food technology teams track its conversion to ethylene as a way to control fruit ripening in transit. Biotechnologists use ACC to tweak gene expression in engineered plants, hunting for varieties that last longer on the shelf or thrive with less water. Because it acts upstream in the ethylene synthesis pathway, small changes in ACC concentration can flip entire physiological switches, making it invaluable not just for academic studies but in the hunt for more sustainable food supply chains.
Decades after its big break in plant biology, ACC keeps researchers busy. Modern tech like real-time PCR and transcriptomics tie patterns of ACC accumulation to environmental stress, revealing plant networks more complicated than anyone guessed a decade ago. By injecting new insight into breeding programs, ACC research offers hope for crops that can feed a hotter, crowded globe. Funders and agrotech firms back research on ACC modulators to manipulate plant hormone levels, an approach that could open doors for longer-lasting produce or smarter pest resistance in cash crops.
Every chemical in widespread lab use faces safety scrutiny, and ACC is no different. Animal studies show modest acute toxicity at high doses, but agricultural use rarely brings people or livestock into direct contact with enough ACC to pose a real hazard. So far, no credible evidence suggests that trace levels in plants endanger human health. I’ve seen studies focus more on its environmental breakdown than on direct toxicity, reflecting growing concern about soil health and residue management. With regulatory interest on the rise, ongoing environmental monitoring gains importance, especially as synthetic uses step outside the greenhouse.
The push for climate resilience guarantees ACC’s future won’t sit quietly on a shelf. As food systems strain under unpredictable weather, breeders and biotech companies focus research on how ACC pathways control key responses like drought endurance and disease resistance. Next-generation sequencing and high-throughput analytic tools keep deepening knowledge of its pathways. With genome editing gaining mainstream acceptance, customizing ACC metabolism in staple crops no longer looks like science fiction. The compound now stands as a point of connection—blending pure chemistry, genetics, and high-impact agriculture in a world that demands more food from less land.
In the world of plant biology, it’s tough to ignore the role that small molecules play in shaping life. 1-Aminocyclopropanecarboxylic acid, or ACC, often slips under the radar for most folks outside research or agriculture. Yet, this simple-sounding amino acid forms the backbone for one of nature’s most influential plant hormones — ethylene. Plants rely on ethylene for a remarkable range of everyday events, from ripening of fruits to how roots dig deeper when life on the surface gets a little rough.
Take tomatoes. They don’t ripen in a straight line on the vine or in a truck bed. Ripening rolls out as ethylene starts flowing in plant tissues. ACC acts like an ignition key for that process. The plant takes ACC and, using a neat little trick with the enzyme ACC oxidase, turns it into ethylene gas. This signals the fruit to soften, sweeten, and change color. That’s mainstage for ACC in food systems.
Grabbing a banana at the grocery store or watching flowers bloom, ACC sits behind the scenes. It steps up when a plant feels stress — drought, high salt, even pests. By triggering ethylene, the plant responds to bad days in the only way it knows how. Researchers figured out that tuning ACC levels in plants can actually produce crops that last longer on shelves. This knowledge drives a significant amount of agricultural research today, with the goal of controlling harvest losses.
Research labs often use ACC in experiments to tease apart how plants manage growth, cope with crowded fields, or resist disease. It offers a way to nudge the plant’s own ethylene machinery, almost like turning up the volume dial on a stereo. For a while now, plant scientists have tested ACC as a feed additive for crops that struggle with cold snaps or unexpected drought. In my own experience working with hydroponic setups, carefully managing ACC gave lettuce a fighting chance against temperature swings that would have ruined an entire batch.
Industry experts have also tested ACC analogs and inhibitors, searching for ways to slow or speed up the natural ripening process. Some of these techniques can make fresh produce travel from farms in South America all the way to distant supermarket shelves without turning to mush halfway through the trip. For larger scale farming operations, tweaking ACC activity can mean millions of dollars saved every year by reducing spoilage.
Playing with plant hormones is a delicate game. Messing with ACC levels doesn’t always create predictable results. Plants often interact with their environment in complicated ways, so scientists continue to study safety, quality, and balance when intervening in such systems. Genetic engineering, nanotechnology, and advanced irrigation all hold promise for dialing in ACC production where needed, and early tests hint at some progress.
Greater transparency about how these molecules impact food and the environment deserves attention from everyone, not just scientists or big agricultural companies. Sharing knowledge about ACC gives farmers and consumers a better shot at making informed decisions — whether that’s about shelf life, nutrition, or supporting resilient agriculture as the climate keeps changing. If the work continues, ACC could become not just a story in journals, but a common phrase in conversations about the food on our plates.
I remember my first organic chemistry class and watching the teacher sketch out odd-shaped molecules on the board. One thing stood out — small rings, especially three-membered ones, behaved differently than long, straight chains. 1-Aminocyclopropanecarboxylic acid, often shortened to ACC, sticks out because it’s got that tough little triangle at its heart. ACC’s chemical formula is C4H7NO2. It seems simple on paper, but ACC’s role in nature runs much deeper.
Thinking about plant growth, most people think about sunlight or maybe the water you give a wilting houseplant. From experience in the backyard, though, I’ve noticed that what’s going on inside the plant affects its growth just as much as what happens outside. ACC acts as a key to the plant hormone ethylene. It’s the direct chemical precursor. If you leave bananas on the counter, it’s ACC inside the peel that helps trigger the ripening process. Scientists figured this out through years of experiments tracing exactly how plants ripen fruits and flowers or even shed leaves under stress.
In research labs, ACC is a big deal for plant molecular biology. Graduate students pipette precise amounts as they study how plants react to salt, drought, and other stress. In my own undergrad days, harvesting pea seedlings to run ethylene measurements, I saw how even a tiny change in ACC could affect the whole system. Chemically, this little molecule packs a punch due to its three-membered ring, and it’s the amine and carboxylic acid together that lets it play so many roles. Its molecular formula, C4H7NO2, may look plain compared to longer chains, but chemistry students learn that it’s about what the structure allows the molecule to do.
Understanding exactly what makes up ACC is not just a question for the chemistry classroom. Farmers rely on ethylene management for crops like tomatoes and melons. Knowing how much ACC is present in a leaf or fruit tells them if it’s time to pick or if action is needed to store their harvest. In industry, people design treatments or formulate products that slow ripening for transport or speed it up to hit the supermarket shelves perfectly ripe. This safeguard for the harvest depends on understanding molecules at the most basic level and it all starts with being able to draw out that C4H7NO2 structure on paper or on a screen.
The next challenge comes from using molecular understanding for smarter agriculture. Researchers want to tweak ACC levels to breed crops that last longer or fight off disease more effectively. Advances in gene editing—like CRISPR—focus on the enzymes connected to ACC, unlocking new possibilities for farmers facing unpredictable weather and supply chain hiccups. That’s where students, scientists, and companies have a role, pushing beyond memorizing formulas to applying them for healthier foods and more resilient fields.
Learning the chemical formula of 1-aminocyclopropanecarboxylic acid may seem like a lost detail to most people. From backyard gardeners to massive producers, the science behind ripening, growth, and stress comes back to these small building blocks. Knowing what’s inside, and what it does, opens doors to better crops, less waste, and a deeper appreciation for the molecules that quietly shape the food on our plates.
Some chemicals end up in research labs more than on factory floors. That’s where 1-Aminocyclopropanecarboxylic acid (ACC) finds itself. Despite the name, this little molecule fertilizes research in plant biology, where it helps scientists study the way plants produce ethylene, a critical hormone. I’ve worked with mild acids and some strong bases over my years in the lab, so I know many chemicals that sound intimidating turn out to be surprisingly approachable with a few basic precautions.
Pick up a bottle of ACC and you won’t find warning colors that scream danger. Still, don’t let appearances fool you. Most reputable suppliers supply a datasheet. Reading that, you’ll notice skin and eye irritation jump off the page. I once forgot my gloves handling a mild organic acid and ended the day with itchy, dry hands—a good lesson to check for small print hazards. ACC fits into this group. It won’t melt a glove, but long stretches in contact with skin, especially broken skin, can result in rashes or discomfort.
Eye contact causes stinging and redness, and that’s no joke. It becomes easy to rub your eye absentmindedly, especially during a long afternoon. Using a pipette in a rush causes spills, which linger quietly on bench tops or gloves. Years of handling dry or powdered chemicals taught me that a careful check of gloves, lab coats, and goggles works wonders. No one needs to risk their sight for an experiment.
Most people think about splashes and forget dust. ACC usually comes as a fine powder, so it’s easy to send a puff into the air when weighing or pouring. Anyone who’s worked in a lab remembers the faint chemical taste of a mishandled reagent. Breathing in dust can irritate airways—sneezing, throat tickling, even coughing fits. As with a lot of powders, avoiding clouds by opening jars slowly and weighing under a fume hood drops that risk close to zero. If you work in teaching labs, you know students often try to talk while measuring. A friendly reminder—mouth closed, mask on—keeps everyone out of trouble. Swallowing any chemical in a lab is never a good idea, and ACC brings mild toxicity, so never eat or drink around it.
Some chemicals require calm but quick responses. Spilled ACC needs a simple sweep and a damp wipe-down. I always double-bag any powder clean-ups to keep it contained. Avoid using a strong vacuum since powders can vanish into filters and become a headache later. Then there's the matter of disposal. City sewers don’t want leftover chemicals, and neither do landfill authorities. Standard policy is to treat it as hazardous lab waste, bundled together with gloves and wipes, set aside for incineration or professional handling.
Years back, a friend got a nasty burn from ethanol and underestimated the clean-up. The real lesson was not about ethanol, but consistency—gloves on, goggles down, mouth closed. With ACC, those basic safety steps make it as safe as most common research chemicals. A central stock note and digital checklist help remind staff what to do and what to avoid. Putting safety first keeps researchers focused on breakthroughs instead of hospital visits.
Most people brush past the details of handling chemicals, thinking everything works the same way for powders or acids. My time spent with researchers taught me 1-Aminocyclopropanecarboxylic acid—often called ACC—demands respect if you want experiments to go right. Those curious white crystals look harmless, but just a bit of air or dampness can ruin a whole batch. I’ve seen a well-prepared synthesis turn to mush after someone left the cap off, not realizing water and heat sneak up quickly.
Manufacturers suggest storing ACC somewhere dry, cool, and away from sunlight. I use amber bottles or tightly sealed containers in a cool cabinet—sticking below room temperature makes a real difference, especially if you don’t go through a bottle quickly. Higher heat often fuels unwanted reactions, sending sensitive compounds down the wrong path. If the label says “refrigerate,” it’s no empty warning. Moisture sneaks in when you keep powder out in humid air, even for a few hours, and ACC will clump or break down before you notice. A good habit: always use a clean scoop and close the lid fast.
Contamination ruins research and wastes money. ACC shouldn’t share space with anything reactive or strong-smelling. Once, a colleague accidentally stored it next to a bottle of volatile solvent—the whole batch turned off-color and unusable. Chemicals rub off on each other all the time in storage areas where bottles sit open or dusty. Regular cleaning and labeling go a long way. Grouping compounds by risk and carefully sealing high-value products fight both mess and waste. I’ve walked in on messy rooms stuffed floor-to-ceiling with bottles. It’s trouble waiting to happen.
Spoiled ACC brings subtle problems. In plant research, unstable reagents mean uneven ripening or inaccurate growth signals. Lower purity shows up as limp fruit or strange colors—hard to spot until several weeks down the line. In industrial settings, degraded ACC throws off costs because batches lose activity or cause strange odors. Spot-testing with standard analysis not only keeps quality high, it prevents accidental exposure if something leaks or degrades faster than expected. Wearing gloves, goggles, and a lab coat adds the last layer of safety—true for every lab, large or small.
Stockpiling chemicals isn’t like keeping spices in a kitchen. Small carelessness piles up costs over time. Protective gear, dry cabinets, and clean tools keep small batches useful for months. Sharing these habits with team members isn’t a burden—it’s just good practice. Spending less on replacements means more money and time for experiments. Simple habits, like labeling every container and checking temperatures, turn a cluttered lab into a reliable workplace.
Most scientists who spend time in plant biology labs know about 1-Aminocyclopropanecarboxylic Acid, or ACC. People don’t usually talk about ACC outside of research groups, but dig a little deeper into plant science, and it pops up everywhere. ACC gets a lot of attention because it’s a key building block for ethylene, a little gas with a huge influence on plant life.
Every time a farmer wants to ripen tomatoes or keep bananas from turning brown too fast, ethylene comes into play. Ethylene helps trigger everything from fruit ripening and flower fading to leaf drop and root growth. That’s why ACC, as the go-to precursor molecule in making ethylene, gets used so often in experiments — feed a plant ACC, and you can watch what happens when ethylene spikes. It’s like flipping a switch and studying the fallout.
I remember sitting through a grad school seminar where a researcher talked about using ACC to untangle how drought stunts plant growth. He pointed out that giving plants extra ACC set off ethylene pathways, showing how stress changes the plant’s own hormone signals. This kind of experiment turns up in studies of how seeds sprout, roots branch out, or flowers bloom at certain times. Researchers rely on ACC to see what shifts if they skip the plant’s normal controls and push the ethylene system directly. In a lab, that can mean answers a lot faster than waiting for nature to run through its slower rhythms.
ACC helps scientists dig into plant genetics. Knockout mutants—those plants with key ethylene genes snipped out—get a dose of ACC in tests all the time. It helps identify which steps in the pathway matter most, or whether a missing enzyme really stops ethylene formation. By playing with ACC levels, teams can track which traits show up or disappear. That’s often how people discover which genes dial up resistance to stress or change flowering time. Sometimes, ACC even helps sort out how other hormones—like auxins—cross paths with ethylene in unexpected ways.
Biologists also study ACC in microbes, not just plants. I know groups that look at bacteria which break down ACC. These bacteria can actually help crops by soaking up extra ACC and cutting down on stress-triggered ethylene, which otherwise stunts plant growth. Studies like these give researchers new ways to help crops handle tough conditions—drought, salty fields, or heavy metals—all thanks to understanding ACC’s role along the way.
Smart use of ACC keeps crop research moving. Genetically mapping responses to ACC tells breeders which combinations give the strongest yield. Instead of chemical-heavy solutions, teams are testing bacteria that “eat” ACC. This cuts costs for growers and helps conserve soils. At the academic level, new ways to detect ACC, through sensors or imaging, promise even tighter control and insight. With food security and climate stress on center stage, every breakthrough counts, and ACC gives researchers a fast track to results.
| Names | |
| Preferred IUPAC name | 1-Aminocyclopropane-1-carboxylic acid |
| Other names |
ACC Aminocyclopropanecarboxylic acid 1-Aminocyclopropane-1-carboxylic acid Cyclopropane-1-carboxylic acid, 1-amino- 1-Aminocyclopropane-1-carboxylate |
| Pronunciation | /ˌwʌn.əˌmiː.noʊ.saɪ.kloʊˌproʊ.peɪn.kɑːrˈbɒk.sɪk ˈæ.sɪd/ |
| Identifiers | |
| CAS Number | 22059-21-8 |
| Beilstein Reference | 1105401 |
| ChEBI | CHEBI:35608 |
| ChEMBL | CHEMBL41884 |
| ChemSpider | 24612 |
| DrugBank | DB03672 |
| ECHA InfoCard | 03c321af-6bd7-4302-958b-6cfcc08ca7e6 |
| EC Number | 2.6.1.49 |
| Gmelin Reference | 8378 |
| KEGG | C01716 |
| MeSH | D015228 |
| PubChem CID | 440894 |
| RTECS number | AS8400000 |
| UNII | F8FA4658KX |
| UN number | UN3338 |
| Properties | |
| Chemical formula | C4H7NO2 |
| Molar mass | 101.12 g/mol |
| Appearance | White to off-white crystalline powder |
| Odor | Odorless |
| Density | 1.186 g/cm³ |
| Solubility in water | Solubility in water: soluble |
| log P | -2.0 |
| Vapor pressure | 2.47E-8 mmHg at 25°C |
| Acidity (pKa) | 9.64 (amino), 2.13 (carboxylic acid) |
| Basicity (pKb) | 8.34 |
| Magnetic susceptibility (χ) | Diamagnetic |
| Refractive index (nD) | 1.497 |
| Viscosity | 1.24 g/cm³ (at 25 °C) |
| Dipole moment | 4.04 D |
| Thermochemistry | |
| Std molar entropy (S⦵298) | 80.7 J·mol⁻¹·K⁻¹ |
| Std enthalpy of formation (ΔfH⦵298) | -131.8 kJ/mol |
| Std enthalpy of combustion (ΔcH⦵298) | -858.6 kJ/mol |
| Hazards | |
| Main hazards | Irritating to eyes, respiratory system and skin. |
| GHS labelling | GHS07, Warning, H315, H319, H335 |
| Pictograms | GHS07 |
| Signal word | Warning |
| Hazard statements | H302, H315, H319, H335 |
| Precautionary statements | P261, P264, P271, P272, P280, P302+P352, P321, P362+P364, P501 |
| NFPA 704 (fire diamond) | 2-1-0 |
| Flash point | 100 °C |
| Autoignition temperature | 320 °C |
| LD50 (median dose) | LD50 (oral, rat): >5000 mg/kg |
| NIOSH | J028097G5R |
| PEL (Permissible) | No OSHA PEL established |
| REL (Recommended) | Not established |
| Related compounds | |
| Related compounds |
Cycloleucine Norleucine Aminocyclopropane Cyclopropanecarboxylic acid Aminocyclobutanecarboxylic acid |
