Every Indian kitchen has a deep frying day, whether it's pooris puffing up for a Sunday brunch or samosas sizzling before guests arrive. The oil sitting in that kadhai decides how your food tastes, how long it stays crisp, and what nutrients survive the heat.
Cold-pressed groundnut oil and its refined counterpart are two of the most common choices for frying across Indian households, but they behave very differently at high temperatures. Here's what actually sets them apart and which one earns its place in your kitchen.
How Cold Pressed and Refined Groundnut Oil Are Made
The way cooking oil is extracted changes everything about it, from its colour to its nutrient content to how it handles a hot pan.
The cold pressed variety is extracted by crushing raw groundnuts in a mechanical press, traditionally a wooden churner known as a Lakdi Ghani. The temperature during extraction stays between 30°C and 40°C. No chemical solvents, no bleaching agents, and no deodorising steps are involved. The oil retains the natural colour, aroma, and flavour of the groundnut, along with its full range of nutrients.
Refined groundnut oil follows a different path altogether. After an initial mechanical press, the oil is treated with hexane (a chemical solvent) to maximise yield. It then goes through degumming, neutralisation, bleaching, and deodorisation, each step stripping away flavour compounds, pigments, and some micronutrients. The result is a pale, odorless oil with a longer shelf life.
| Feature | Cold Pressed | Refined |
|---|---|---|
| Extraction method | Mechanical pressing (Lakdi Ghani) at 30–40°C | Solvent extraction + chemical refining |
| Colour | Deep golden yellow | Pale, almost clear |
| Aroma | Strong, nutty | Neutral, minimal |
| Chemical solvents used | None | Hexane and other agents |
| Nutrient retention | High (vitamins, antioxidants intact) | Lower (stripped during processing) |
Smoke Point: The Number Everyone Talks About
Smoke point is the temperature at which oil begins to break down, release visible smoke, and produce harmful compounds. It's the most common argument in the cold pressed groundnut oil vs refined oil conversation, and it deserves context, not just a number:
- Refined groundnut oil has a smoke point of approximately 232°C (450°F).
- The cold-pressed variety sits lower, around 160°C (320°F), depending on the batch and how it was processed.
Most Indian deep frying- pooris, pakoras, vadas, samosas- happens between 160°C and 180°C. At these temperatures, the cold-pressed oil holds up well for home-scale frying. It doesn't hit its breaking point when used at the right heat and not reused multiple times.
A 2014 study published in the Journal of Food Science and Technology found that groundnut oil showed less oxidative degradation during continuous frying compared to intermittent frying, suggesting that how you fry matters as much as which oil you use.
What This Means for Your Kitchen
Use Cold Pressed Groundnut Oil: For occasional deep frying at home, like a batch of jalebis during Diwali or some aloo bondas on a rainy evening, the key is keeping the flame at medium-high rather than maximum and not reheating the same oil repeatedly.
Refined Oil Suits Situations: where the oil needs to sustain very high heat over extended periods, such as commercial kitchens frying continuously for hours.
Nutrients: What Survives the Extraction Process
This is where the cold-pressed variety earns a clear advantage.
Groundnut oil is naturally rich in monounsaturated fatty acids (MUFA), primarily oleic acid. Research published in Frontiers in Plant Science reports that groundnut oil comprises roughly 80% unsaturated fatty acids, with oleic acid (a MUFA) making up about 42% and linoleic acid (a PUFA) about 37%.
Cold pressing preserves this fatty acid profile along with fat-soluble micronutrients, particularly vitamin E (tocopherols) and phytosterols. A study in LWT – Food Science and Technology confirmed that cold-pressed peanut oil retains higher levels of natural tocopherols compared to oils extracted using heat-intensive methods.
Refined oil retains the same basic fatty acid structure; the oleic and linoleic acid ratios stay similar, but it loses a portion of its vitamin E, polyphenols, and natural antioxidants during the bleaching and deodorising stages.
| Nutrient | Cold Pressed | Refined |
|---|---|---|
| Oleic acid (MUFA) | ~40–55% | ~40–55% |
| Vitamin E (tocopherols) | Higher retention | Reduced during refining |
| Phytosterols | Present | Partially removed |
| Polyphenols | Present | Largely removed |
| Trans fats | None | None (when not hydrogenated) |
For a family looking to get the most nutrition from their cooking oils, cold-pressed varieties deliver more of what the groundnut naturally contains.
Flavour and Taste: The Difference You Can Actually Notice
Ask any home cook who has switched from refined to wood-pressed groundnut oil, and the first thing they'll mention is the taste. The cold-pressed variety has a warm, roasted, distinctly nutty flavour. It adds its own character to whatever you fry in it. Pakoras made in this oil taste richer. Even a simple tadka of mustard seeds and curry leaves carries more depth.
Refined groundnut oil is deliberately flavour-neutral. The deodorisation process strips out the aromatic compounds that give the oil its signature taste. For recipes where you want the oil to stay invisible, say, a delicately spiced fish fry where the marinade should dominate, the refined option does that job.
Neither approach is wrong. It depends on what you're cooking and what your family prefers.
A Practical Way to Use Both
Many Indian households keep two oils in rotation:
- A wood-pressed oil for everyday cooking where flavour matters
- A neutral oil for specific dishes or bulk frying.
This isn't about picking sides. It's about matching the oil to the meal.
Storage, Shelf Life, and Everyday Handling
The cold-pressed variety, because it retains more of its natural compounds, is more sensitive to light, heat, and air. Store it in a dark glass bottle or an opaque container, away from direct sunlight. Once opened, it's best used within two to three months.
Refined oil lasts longer, six months or more in most cases, because the compounds that cause rancidity have been stripped out during processing. It's also less likely to thicken in cooler weather.
A few storage rules that apply to both:
- Keep the bottle tightly sealed after every use
- Store in a cool, dry place away from the stove
- Never pour used oil back into the fresh bottle
- Avoid reusing frying oil more than once or twice
So, Which Oil Is Better for Deep Frying?
The answer comes down to how often you fry and in what quantities.
Cold-pressed groundnut oil handles home-style deep frying well. Moderate portions, occasional batches, and the honest flavour of groundnut coming through in your pakoras and puris. Its nutrient profile, natural antioxidants, and absence of chemical processing make it a solid everyday choice for Indian kitchens.
Refined groundnut oil earns its place in high-volume, high-heat settings: restaurant fryers running for hours, commercial kitchens pushing through large batches back to back.
Most Indian households fall squarely into the first category. A health-conscious family frying at home a few times a week gets the benefit of better nutrient retention, genuine groundnut flavour, and a cleaner extraction process. The slightly higher price pays for itself in what you are not consuming: no hexane residues, no bleaching agents, no deodorising chemicals.
Indic Wisdom's cold-pressed groundnut oil is extracted and packed in-house, available in 1 litre and 5 litre packs for everyday home cooking.
Frequently Asked Questions
Is cold pressed groundnut oil safe for deep frying at home?
Yes. Cold pressed groundnut oil has a smoke point around 160°C, and most Indian deep frying happens between 160°C and 180°C. For home-scale frying, a batch of pakoras or pooris, it handles the heat well, provided you keep the flame at medium-high and avoid reusing the oil multiple times.
Does cold pressed groundnut oil lose nutrients when heated?
Some nutrient loss is natural whenever any oil is heated. However, the cold pressed variety starts with higher levels of vitamin E and natural antioxidants compared to its refined counterpart. Even after moderate frying, it retains more of these beneficial compounds at the same temperature.
Why does refined groundnut oil have a higher smoke point?
The refining process removes free fatty acids, phospholipids, and other natural compounds that lower an oil's smoke point. Stripping these out raises the temperature threshold before the oil starts to smoke. The trade-off is that many heat-sensitive nutrients are lost along the way.
Can I reuse cold pressed groundnut oil after deep frying?
It's best to limit reuse to once, and only if the oil hasn't darkened significantly or developed an off smell. Research shows that intermittent frying, heating, cooling, and reheating, degrades groundnut oil faster than continuous frying (Debnath et al., J Food Sci Technol, 2014). This applies to both cold pressed and refined varieties.
Which oil is better for deep frying: cold pressed groundnut or refined?
For home kitchens frying in moderate quantities, the cold pressed variety is a strong choice because it retains more natural nutrients and adds flavour. The refined variety is better suited for commercial kitchens or situations requiring sustained high heat over long periods. Many families use both, choosing based on the dish and the occasion.