Palak Paneer Recipe: Why Yours Turns Dark or Bitter, and the Blanching Step That Fixes Both
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A quick note: This article shares general food and wellness information for Indian readers. It is not medical advice. Bodies differ. If you are pregnant, unwell, or managing a health condition, please ask your doctor before making changes.
Why Does Palak Paneer Turn Dark, Khaki or Brown?
Short answer: The green pigment in palak is chlorophyll. Chlorophyll holds one magnesium atom at its centre. Heat and acid knock that atom out. What is left is called pheophytin, and pheophytin is dull olive. The longer the palak cooks, the further it goes.
Nobody sets out to cook khaki palak paneer. It happens near the end. It feels like bad luck.
It is not luck. It is one named reaction, with three switches you already control.
The reaction has a name
Chlorophyll is built around a single magnesium atom. That atom makes the leaf green.
Take the magnesium out and the molecule survives. Its colour does not.
Chemists call this step pheophytinization. A 2012 review in Chemistry & Biodiversity covers it.
The review notes why food scientists care. Colour is how shoppers judge a green vegetable.
The same change was later tracked on spinach itself. A 2021 study in Food Research International watched spinach chlorophylls a and b turn into pheophytin a and b. Acid was what drove it.
The three switches
| Switch | What it does | What to do in your kitchen |
|---|---|---|
| Time | Every extra minute of heat pushes more chlorophyll over | Blanch in minutes, not in a long simmer |
| Heat | Higher temperature speeds the same reaction | Use a rolling boil and a short dip, then stop it cold |
| Acid | Acid supplies the hydrogen that replaces the magnesium | Keep tomato, lemon, amchur and curd out of the green stage |
Most home recipes break that third row. Tomato goes in early, and the palak sits in it.
Add the acid late, off the boil. Or leave it out. The gravy keeps its colour either way.
📊 Straight talk about the lid. You will read everywhere that a lid "traps volatile acids" and dulls the green. I went looking for a study that tests it. There is none. What the sources support is simple: time, heat and acid. A short, hard blanch is fast, so it works. The lid itself is folklore.
Why reheating kills it too
The reaction does not stop when you serve. It only slows down.
Palak paneer reheated twice is duller than palak paneer reheated once. Same chemistry, more time.
Make the green base ahead if you like. Add the paneer and cream only when you serve.
How Do You Blanch Palak So It Stays Green?
Short answer: Drop clean palak leaves into hard-boiling water for two minutes. Lift them straight into ice water, then drain them well. Now throw the blanching water away. That water holds the oxalate that leached out of the leaves.
Blanching is two minutes of work. It decides the whole dish, and most people half-do it.
Two minutes, and where that number comes from
The National Center for Home Food Preservation publishes blanching times.
Its line on greens is short. "Water blanch collards 3 minutes and all other greens 2 minutes."
Spinach sits in that second group. Two minutes in boiling water is the published figure.
The same page says what blanching is for. It "slows or stops the action of enzymes which cause loss of flavor, color and texture".
Note the order there. Colour is a stated goal, not a side effect.
The ice bath is not optional
Hot leaves keep cooking after they leave the pot. Leftover heat is still heat.
A bowl of water with ice stops that in seconds. Skip it and you lose the two minutes you just measured.
Lift the leaves out with a slotted spoon or tongs. Do not tip the whole pot into a colander over the sink.
Keep the leaves. Lose the water.
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Brings a litre to a hard boil on the counter, so the blanch water is ready before you finish washing the palak.
Shop NowNow throw the water away
Almost every recipe gets this part wrong. It is the most useful thing on this page.
Plenty of Indian recipes tell you to purée the palak with its blanching water. The reasoning sounds sensible. Keep the colour, waste no nutrients.
The research says that water is not a bonus. It is where the oxalate went.
A 2005 study in the Journal of Agricultural and Food Chemistry measured this. Nine vegetables, cooked four ways.
📊 The number that matters: boiling cut soluble oxalate in vegetables by 30 to 87 per cent. Steaming managed only 5 to 53 per cent. The researchers then tested the cooking water. Roughly 100 per cent of the lost oxalate was sitting in it. Source: Chai and Liebman, J Agric Food Chem 2005;53(8):3027-30.
Pour that water into the mixie and you undo the blanch. All of it goes back in.
The same paper makes a second point. Steaming barely touches soluble oxalate, so it is no shortcut.
Use water, use plenty of it. Then pour it down the sink.
The full sequence
| Step | Time | Why it is there |
|---|---|---|
| Wash the leaves in standing water, twice | 2 minutes | Palak carries grit in the crease of the leaf |
| Pick off thick stems | 1 minute | Stems stay fibrous and show up as threads in the gravy |
| Boil water hard, salt it lightly | 3-4 minutes | A weak boil drops temperature when the leaves go in |
| Blanch | 2 minutes | Enzymes off, colour set, oxalate leaching |
| Ice shock | 1 minute | Stops the carry-over cooking |
| Drain and squeeze gently | 1 minute | Wet leaves make a thin, watery gravy |
| Discard the blanching water | - | It holds the leached oxalate |
Ten minutes, start to finish. What follows is cooking, not chemistry.
Purée, do not liquidise
Blend the drained leaves cold, in short bursts. Add a spoon or two of plain water.
Long blending warms the purée and restarts the colour clock. Short bursts keep it cold.
Leave a little texture. A wholly smooth purée tastes like soup.
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Short pulses on a small jar, so the blanched palak stays cold while it purees.
Shop NowHow Do You Make Palak Paneer at Home in 30 Minutes?
Short answer: Blanch and purée the palak first. That takes about ten minutes. Build a simple onion, ginger, garlic and tomato base in eight. Fold the cold purée in at the end and warm it for two minutes only. The paneer goes in last, off the heat.
The order below is chosen for colour. The palak spends as little time on heat as possible.
For three people
- 500 g fresh palak, thick stems removed (about 2 large bunches)
- 250 g paneer, cut into 2 cm cubes
- 1 large onion, chopped fine
- 1 medium tomato, chopped
- 6 cloves garlic, chopped
- 1 inch ginger, chopped
- 2 green chillies
- 2 tablespoons ghee or oil
- 1/2 teaspoon cumin seeds
- 1/4 teaspoon turmeric
- 1/2 teaspoon garam masala
- 1 teaspoon kasuri methi, crushed between your palms
- 2 tablespoons fresh cream, plus a little to finish
- Salt to taste
- A bowl of water with ice
The method, with the clock
- Blanch the palak (4 minutes). Hard boil, leaves in for two minutes, straight into the ice water. Drain well and throw the hot water away.
- Purée it cold (2 minutes). Short pulses with the green chillies and a splash of fresh water. Set it aside.
- Soak the paneer (runs in the background). Warm water, a pinch of salt, ten minutes. This is what keeps it soft.
- Temper (1 minute). Ghee in the kadai on medium. Cumin seeds in, wait for them to darken.
- Garlic and ginger (1 minute). In together, stir until they smell sweet. Pull them off the heat before they brown.
- Onion (4 minutes). In with a pinch of salt. Cook to soft and pale gold, not dark brown.
- Tomato and turmeric (3 minutes). In together. Cook until the tomato collapses and the ghee separates at the edges.
- Fold in the purée (2 minutes). Heat low. Stir it through and let it warm, not boil.
- Season (30 seconds). Salt, garam masala and the crushed kasuri methi.
- Paneer last (1 minute). Drain the cubes and fold them in. Heat off.
- Finish. Cream swirled on top, and serve.
About thirty minutes. The palak sees direct heat for four of them.
That is the whole trick. The rest is an ordinary onion-tomato base.
The chopping is the slow part
One onion, six garlic cloves and an inch of ginger take most cooks five minutes by hand.
That is a sixth of the recipe. It also decides how evenly the base cooks. Big pieces of garlic burn while the onion is still raw.
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Onion, garlic and ginger in one bowl, chopped evenly in seconds instead of five minutes.
Shop Now📊 Why the paneer goes in last: paneer is set milk protein. Hold it at a simmer and that network tightens. Water is squeezed out, and the cube turns squeaky. Fold it in off the heat and it stays soft.
Two things worth buying right
Kasuri methi is not garnish. Crush it between your palms at the end. It is most of what makes the dish smell like a restaurant.
Buy kasuri methi in a sealed pack, not loose. Keep it dry.
The second is a wide steel colander. Drain blanched leaves in a small tea strainer and the water ends up back in the gravy.
Why Does Palak Paneer Taste Bitter or Chalky?
Short answer: Two different faults get called bitter. A chalky, tooth-coating feel comes from oxalate. Palak carries a lot of it. Real bitterness comes from browned garlic, scorched turmeric or over-boiled palak. Blanching fixes the first. Cooking order fixes the second.
It helps to separate the two. They have different causes and different fixes.
The chalky feel is oxalate
Palak is one of the highest-oxalate foods in an Indian kitchen. The Indian Food Composition Tables measured it.
📊 What is actually in 100 g of palak (IFCT 2017, food code C033): total oxalate 592 mg. Of that, 241 mg is soluble and 351 mg is not. The soluble share is what dissolves, leaches into your blanching water and binds calcium in the gut.
That split is the useful part. Only the soluble share moves.
Boil the leaves and much of that 241 mg goes with the water. Skip the blanch and it all stays.
An Indian survey of eleven leafy vegetables ranked them by total oxalate. Palak sat in the top group, with amaranth and colocasia.
The same study found something more useful. Curry leaves, drumstick, shepu, methi, coriander, radish leaves and onion stalks carried only the insoluble kind.
So this is not a leafy-vegetable problem. It is a palak problem, and blanching is the answer.
Real bitterness comes from the pan
| What you taste | Where it came from | Fix |
|---|---|---|
| Sharp, burnt bitterness | Garlic taken past golden | Garlic and ginger go in after the cumin, for one minute, on medium |
| Dusty, medicinal bitterness | Turmeric hit dry heat | Add turmeric with the tomato, never onto hot bare ghee |
| Green, grassy bitterness | Palak boiled too long, or stems left in | Two minutes, and pull the thick stems out first |
| Chalky, tooth-coating feel | Oxalate, blanching water reused | Blanch, drain, discard the water |
| Flat and sour at once | Tomato added before the palak and boiled with it | Cook the tomato down fully before the purée goes in |
| Metallic edge | Palak simmered long in a reactive pan | Keep the green stage short; use steel or a coated pan |
Five of those six are timing, not ingredients. None of them costs money to fix.
Flat rather than bitter? The salt went in at the end. Salt the onion, not the finished gravy.
Does the Paneer Cancel Out the Spinach Oxalate?
Short answer: Partly, and the honest answer is smaller than the internet's. Calcium does bind oxalate. Paneer brings plenty of calcium and no oxalate of its own. In laboratory digestion of Indian greens, added calcium cut available oxalate by 32 to 100 per cent. But the one human trial that tested cottage cheese found no significant drop.
Palak paneer gets called a clever pairing. It mostly is. The evidence is thinner than the claim.
What the two foods actually bring
| Per 100 g (IFCT 2017) | Palak | Paneer |
|---|---|---|
| Energy | 102 kJ | 1278 kJ |
| Protein | 2.14 g | 18.86 g |
| Fat | 0.64 g | 24.78 g |
| Calcium | 82.29 mg | 476 mg |
| Iron | 2.95 mg | 0.90 mg |
| Total oxalate | 592 mg | Below detectable limit |
Read the last two rows together. The palak brings the oxalate. The paneer brings the calcium.
Paneer's own oxalate cell is blank. The table legend says blank means below the detectable limit.
The lab evidence is strong
A 2008 paper in the International Journal of Food Sciences and Nutrition tested eleven Indian leafy vegetables. The test used a simulated digestion.
They then added four calcium sources. Low-fat milk, whole milk, calcium carbonate and calcium sulphate.
📊 The result: adding a calcium source cut intestinally available oxalate by 32 to 100 per cent across the vegetables tested. Source: Radek and Savage, Int J Food Sci Nutr 2008;59(3):246-60.
The human evidence is weaker
A 2003 trial fed ten volunteers grilled spinach. They ate it alone, and with three dairy foods.
Sour cream with calcium-fortified milk cut absorption sharply. Cottage cheese did not, and it is the closest thing on that list to paneer.
| Test meal | Oxalate absorbed in 6 hours |
|---|---|
| Spinach alone | 0.75% |
| Spinach with sour cream | 0.52% |
| Spinach with cottage cheese | 0.90% |
| Spinach with sour cream and calcium-fortified milk | 0.14% |
| Spinach with olive oil | 0.97% |
Ten people is a small study, and cottage cheese is not paneer. Neither fact makes the result vanish.
So the fair version is this. Calcium and oxalate do bind, and the lab work is clear. The single human test of a fresh cheese came out flat.
The same trial found one more thing. In their spinach, 76.7 per cent of the vegetable's own calcium was already locked up as insoluble oxalate.
That is why palak is a poor calcium source, whatever the table says. Our guide to calcium rich foods in India works through which foods deliver.
What to do with all that
Blanch and discard. That step has measured evidence behind it, and it happens before the paneer arrives.
Then enjoy the pairing for what it is. A near-zero-oxalate protein sitting inside a high-oxalate vegetable.
What Does Indian Law Say Paneer Must Be?
Short answer: Paneer has a legal standard in India. Sub-regulation 2.1.16 caps its moisture at 60 per cent. It also sets a floor of 50 per cent milk fat on a dry-matter basis. Anything leaner must be sold as medium fat or low fat paneer, declared on the label.
This matters for cooking, not just shopping. Fat and moisture decide whether a cube stays soft.
The standard, in plain words
The Food Safety and Standards Authority of India sets the rule. It is sub-regulation 2.1.16, the standard for chhana and paneer.
It first defines the food. Paneer is made from milk "by precipitation with permitted acidulants and heating".
The permitted acidulants are listed. Lactic acid, citric acid, malic acid, vinegar, glucono delta lactone and sour whey.
Spices and salt are allowed only in flavoured paneer. Plain paneer is milk and an acid. Nothing else.
| Sold as | Moisture, maximum | Milk fat, dry-matter basis | Label rule |
|---|---|---|---|
| Paneer | 60.0% | 50.0% minimum | Plain name |
| Medium Fat Paneer | 60.0% | More than 20.0%, less than 50.0% | Must print "Contains ……% Milk Fat" |
| Low Fat Paneer | 70.0% | 20.0% maximum | Sealed pack only, declared on the label |
Look at the fat column again. Take the water out and plain paneer must be at least half fat.
That is a lot of fat. It is why good paneer browns kindly and stays tender. Low fat paneer holds more water, so it firms up faster on heat.
The analogue rule is the one to check
The same regulations define an "analogue in the dairy context". It is a product where non-milk ingredients stand in for milk ones.
The rule is blunt. Analogues "are not considered milk, milk products or composite milk products". Dairy terms may not be used if the product replaces one.
An analogue must also name each non-milk constituent. The words "Contains ………" go next to the product name.
📊 What to look for on the pack: a "Contains ……" line next to the name, or the words Medium Fat or Low Fat. Any of those changes how the block behaves in the pan. Source: Food Safety and Standards (Food Products Standards and Food Additives) Regulations 2011, sub-regulations 2.1.1 and 2.1.16.
Or skip the question
Paneer made at home is milk, an acid and twenty minutes. You know what went in.
The method is in how to make paneer at home. The case for bothering is in homemade paneer versus the packet.
Want the protein arithmetic? Our paneer protein chart has the per-cube numbers.
For a home block you need a muslin cloth and a heavy weight. Nothing else.
Why Is Restaurant Palak Paneer Greener and Creamier?
Short answer: Restaurants blanch in volume and shock in ice. They purée cold, then cook the green stage for under two minutes on a very hot range. They also add fat, usually cream or cashew paste. Fat coats the pigment and makes it look brighter. None of it is a secret ingredient.
The gap between a restaurant plate and a home kadai is mostly process.
| Step | Restaurant | Typical home kitchen |
|---|---|---|
| Blanching | Big pot, hard boil, 1-2 minutes, done in batches ahead | Small pan, weak boil, leaves left in longer |
| Cooling | Straight into ice water | Left in the colander to cool on its own |
| Blanching water | Discarded | Often blended back in |
| Purée | Cold, coarse, made fresh | Warm, over-blended |
| Green stage on heat | Under 2 minutes on a hot range | Simmered 10 minutes or more |
| Acid | Tomato cooked down separately first | Tomato boiled together with the palak |
| Fat | Cream, butter, sometimes cashew paste | A spoon of cream at the end, if any |
| Paneer | Soaked in warm salted water, added last | Fried hard, then simmered in the gravy |
Rows three, five and six change the colour. Row seven changes how it looks on the spoon.
What to copy and what to leave
Copy the process. It costs nothing, and it is where the difference lives.
Be careful with the fat. A restaurant portion carries cream and butter you never measured. Paneer already brings 24.78 g of fat per 100 g.
Two tablespoons of cream in a dish for three is plenty. That changes the sheen, not the meal.
And the saag question
Palak paneer is made with palak alone. Saag is a mixed-greens dish, most often mustard greens. In Punjab it usually arrives with makki ki roti.
Menus use the two names loosely. In your kitchen they are different dishes with different cooking times.
For raw spinach, see our spinach and moringa green smoothie guide.
How Do You Fix Palak Paneer That Has Already Gone Wrong?
Short answer: Dark gravy cannot be turned green again. Treat it as a flavour dish and finish it with cream and kasuri methi. Reduce watery gravy on low heat, uncovered. Rescue rubbery paneer with a ten-minute soak in warm salted water.
Most palak paneer faults are fixable the same evening. One is not.
| What went wrong | Why | What to do now |
|---|---|---|
| Gravy went khaki or brown | Too long on heat, or acid added early | Colour will not come back. Add cream and kasuri methi and serve it as a dark, rich version. |
| Thin and watery | Blanched leaves went in wet | Reduce on low heat, uncovered, for 3-4 minutes. Do not add flour. |
| Chalky on the teeth | Blanching water went into the purée | Nothing fixes this batch. Blanch and discard next time. |
| Paneer squeaky and rubbery | Simmered in the gravy | Lift the cubes out, soak in warm salted water for 10 minutes, fold back in off the heat. |
| Bitter edge | Garlic browned or turmeric scorched | A spoon of cream and a pinch of sugar soften it. Change the order next time. |
| Stringy threads in the gravy | Thick stems blended in | Pass it through a coarse strainer, or accept it and pick stems next time. |
| Tastes flat | Salt added only at the end | Salt the onion stage. Finish with kasuri methi rather than more salt. |
| Grit between the teeth | Palak not washed in standing water | Wash in a full bowl, twice, lifting the leaves out rather than pouring. |
The six habits that make it work
- Two minutes in the boil, not five, and not a lazy simmer.
- Ice water straight after, every time.
- Throw the blanching water away. That is where the oxalate is.
- Purée cold, in short bursts.
- Keep acid out of the green stage. Cook the tomato down first.
- Paneer in last, off the heat.
Palak paneer is not a difficult dish. It has one fragile ingredient and a short window.
Protect the green for four minutes. The rest looks after itself.
Cook a lot of Indian weeknight food? Our pav bhaji recipe and poha recipe take the same approach.
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Frequently Asked Questions
Why does my palak paneer turn dark or black?
Because the chlorophyll in the palak is losing its central magnesium atom, a change chemists call pheophytinization. Heat, time and acid all speed it up, and what replaces the bright green is a dull olive pigment called pheophytin. The fix has four parts. Blanch the leaves for about two minutes. Shock them in ice water. Keep tomato and lemon out of the green stage. Then warm the puree through for two minutes at most.
Should I use the blanching water in the gravy?
No. A 2005 study in the Journal of Agricultural and Food Chemistry measured this. Boiling cut soluble oxalate in vegetables by 30 to 87 per cent. Roughly 100 per cent of the lost oxalate turned up in the cooking water. Pouring that water into the mixie puts back the exact thing the blanching removed. Drain the leaves and throw the water away.
How long should palak be blanched?
About two minutes in hard-boiling water. The National Center for Home Food Preservation gives three minutes for collards. All other greens get two minutes, and that includes spinach. Lift the leaves straight into a bowl of ice water. Residual heat keeps cooking them in the colander.
Does the paneer cancel out the oxalate in the spinach?
Partly. Calcium binds oxalate. Paneer carries 476 mg of calcium per 100 g and no measurable oxalate of its own. Palak carries 592 mg of total oxalate in the same 100 g. A 2008 study of Indian leafy vegetables tested this in laboratory digestion. Adding a calcium source cut available oxalate by 32 to 100 per cent. The human evidence is thinner. A 2003 trial fed spinach to ten volunteers. Cottage cheese did not significantly reduce oxalate absorption. Sour cream with calcium-fortified milk did.
Why is my paneer rubbery in the gravy?
Because it was held at a simmer. Paneer is set milk protein. Sustained heat tightens that protein network and squeezes water out. Soak the cubes in warm salted water for ten minutes. Fold them in with the heat switched off.
What is the difference between palak paneer and saag paneer?
Palak paneer is made with palak, meaning spinach, on its own. Saag is a mixed-greens dish, most often built on mustard greens. In Punjab it usually arrives with makki ki roti, not paneer. Menus use the two names loosely. The cooking times and the taste are not the same.
Is palak paneer good for you?
It pairs a very low-calorie leaf with a high-protein, high-fat cheese. The Indian Food Composition Tables give 100 g of palak 102 kJ, 2.14 g protein, 82.29 mg calcium and 2.95 mg iron. The same weight of paneer gives 1278 kJ, 18.86 g protein, 24.78 g fat and 476 mg calcium. The caution is oxalate, not fat. Palak is high in it. Blanching and discarding the water removes part of it. Have you had calcium-oxalate kidney stones? Then high-oxalate foods are a question for your doctor, not a recipe page.
What does Indian law require paneer to contain?
The rule is sub-regulation 2.1.16 of the Food Safety and Standards (Food Products Standards and Food Additives) Regulations. Plain paneer may hold at most 60 per cent moisture. It must carry at least 50 per cent milk fat on a dry-matter basis. Medium Fat Paneer sits between 20 and 50 per cent milk fat and must print that figure. Low Fat Paneer is capped at 20 per cent and must be sold in a sealed pack, declared on the label. A dairy analogue is not legally paneer at all. It has to declare each non-milk constituent next to the product name.
Sources & References
- Indian Food Composition Tables 2017 - food code C033 Spinach (Spinacia oleracea): total oxalate 592 mg with 241 mg soluble and 351 mg insoluble, calcium 82.29 mg, iron 2.95 mg, protein 2.14 g, fat 0.64 g, energy 102 kJ, vitamin C 30.28 mg, total folate 142 micrograms and vitamin K1 325 micrograms per 100 g; and food code L003 Paneer: protein 18.86 g, fat 24.78 g, energy 1278 kJ, calcium 476 mg, iron 0.90 mg, phosphorus 330 mg and zinc 2.74 mg per 100 g, with the oxalate cells blank, which the table legend defines as below the detectable limit — T. Longvah, R. Ananthan, K. Bhaskarachary and K. Venkaiah, ICMR-National Institute of Nutrition, Hyderabad
- Effect of different cooking methods on vegetable oxalate content - boiling reduced soluble oxalate by 30 to 87 per cent and was more effective than steaming at 5 to 53 per cent, and an assessment of the cooking water showed approximately 100 per cent recovery of the oxalate lost from the vegetables — W. Chai and M. Liebman, Journal of Agricultural and Food Chemistry 2005;53(8):3027-3030, University of Wyoming
- Oxalates in some Indian green leafy vegetables - spinach, purple and green amaranth and colocasia carried the highest total oxalate of eleven Indian leafy vegetables tested, while curry, drumstick, shepu, fenugreek, coriander, radish and onion stalks contained only insoluble oxalate; adding four calcium sources produced a 32 to 100 per cent reduction in intestinally available oxalate — M. Radek and G. P. Savage, International Journal of Food Sciences and Nutrition 2008;59(3):246-260
- Bioavailability of soluble oxalate from spinach eaten with and without milk products - in ten volunteers the mean bioavailability of soluble oxalate from grilled spinach was 0.75 per cent over six hours, 0.90 per cent when eaten with cottage cheese, 0.52 per cent with sour cream and 0.14 per cent with sour cream plus calcium-fortified milk; 76.7 per cent of the spinach's own calcium was already bound as insoluble oxalate and unavailable — M. Brogren and G. P. Savage, Asia Pacific Journal of Clinical Nutrition 2003;12(2):219-224, Lincoln University, New Zealand
- Food Safety and Standards (Food Products Standards and Food Additives) Regulations 2011, Version XXIV - sub-regulation 2.1.16 Standard for Chhana and Paneer, giving maximum moisture 60.0 per cent and minimum milk fat 50.0 per cent on a dry-matter basis for paneer, the medium fat and low fat bands with their label declarations, and the list of permitted acidulants; and sub-regulation 2.1.1, which defines an analogue in the dairy context and requires a Contains declaration in close proximity to the product name — Food Safety and Standards Authority of India
- Freezing Greens (Including Spinach) - the instruction to water blanch collards for 3 minutes and all other greens for 2 minutes, and the explanation that blanching slows or stops the action of enzymes which cause loss of flavour, colour and texture — National Center for Home Food Preservation, University of Georgia Cooperative Extension, extracted from So Easy to Preserve, 6th edition 2014, Bulletin 989
- Demetalation of chlorophyll pigments - a review of pheophytinization, the removal of the central magnesium atom from chlorophyll, including kinetic studies of demetalation under acidic conditions and the relevance of the reaction to colour in processed vegetable foods — Y. Saga and H. Tamiaki, Chemistry and Biodiversity 2012;9(9):1659-1683, Kinki University and Ritsumeikan University, Japan
- Biological transformation of chlorophyll-rich spinach (Spinacia oleracea L.) extracts under in vitro gastrointestinal digestion - chlorophylls a and b from spinach favoured pheophytinization under acidic digestion, forming pheophytin a and pheophytin b — Y. Li, F. Lu, X. Wang, X. Hu, X. Liao and Y. Zhang, Food Research International 2021;139:109941, China Agricultural University
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