Exploring the Nutritional and Functional Properties of Ghee Residue

Every time ghee is prepared – whether at home or in a large dairy plant – a brownish, aromatic mass is left behind after the clear fat is filtered out. This is ghee residue, also called ghee sediment. Most people discard it without a second thought. But this so-called waste is actually packed with fat, proteins, carbohydrates, minerals, and powerful bioactive compounds. Understanding what ghee residue contains and what it can do opens the door to smarter, more sustainable uses in food production.

What exactly is ghee residue? 🔗

During ghee manufacturing, butter or cream is heated until the water evaporates and milk solids separate from the pure butterfat. The solids-not-fat (SNF) present in cream or butter settle as small, partially charred particles that are strained out using muslin cloth, bag filters, or centrifugal clarifiers. This moist, light-to-dark brown material is the ghee residue.

India produces roughly 91,000 tonnes of ghee residue per year, yet most of it goes to waste or is sold cheaply as animal feed. That is a missed opportunity, because the residue holds nutrients and functional compounds that ghee itself largely lacks.

How ghee preparation method affects composition 🔗

The nutrient profile of ghee residue is not fixed – it changes significantly depending on how the ghee was made. Three common methods produce noticeably different residues:

Creamery butter (CB) method: This route yields residue with higher moisture, protein, and ash content. It also produces residue with the strongest antioxidant properties. The yield of residue is about 3.7% of the total.

Desi butter (DB) method: The residue from desi butter ghee has the highest lactose content and a yield similar to the CB method. Its antioxidant capacity falls between CB and direct cream residues.

Direct cream (DC) method: This method gives the highest residue yield – around 12% – but the residue contains more fat and less protein compared to CB and DB residues.

These variations matter because they determine which applications a particular batch of ghee residue is best suited for – whether that is flavour enhancement, antioxidant fortification, or protein supplementation.

Nutritional composition of ghee residue 🔗

Ghee residue is far more nutritionally diverse than ghee, which is almost entirely fat. The approximate composition ranges are: fat 32-70%, protein 12-39%, moisture 8-30%, lactose 2-14%, and ash 1-8%, depending on the preparation method. Let us look at each macronutrient group in detail.

Protein content and amino acid profile 🔗

Ghee residue is a notable source of protein, primarily consisting of heat-modified casein and whey proteins. One study found crude protein content at about 19.86% on a fresh-weight basis, while another reported values as high as 25.71% on a dry-matter basis. The residue contains essential amino acids such as lysine (around 0.98-0.99%), methionine (0.51-0.61%), threonine (1.28-1.44%), and arginine (0.76-0.79%).

However, there is a catch. High-temperature processing during ghee making damages some amino acids, particularly lysine. This reduces the protein efficiency ratio (PER) of ghee residue significantly. Studies at NDRI, Karnal found that pure ghee residue had a PER of just 0.66, compared to 3.44 for skim milk powder. But when ghee residue was supplemented with lysine, methionine, and tryptophan, its nutritional value improved to levels slightly above skim milk powder. This means proper amino acid fortification can unlock the full protein potential of ghee residue.

Fat and fatty acid profile 🔗

Although ghee residue contains less total fat than pure ghee, its fatty acid makeup is more favourable in certain respects. The lipids in ghee residue have a lower proportion of short-chain fatty acids (C4-C12) at 5.3% and total saturated fatty acids at 58.7%, with higher unsaturated fatty acids at 41.3%, compared to ghee which has about 66.8% saturated and 33.2% unsaturated fatty acids.

The residue also contains higher levels of polyunsaturated fatty acids (PUFAs) – about 4.4% versus 2.8% in ghee. Key essential fatty acids present include linoleic acid (around 2.02-2.22%) and linolenic acid (0.33-0.79%), along with small amounts of EPA and DHA. This makes ghee residue a comparatively better source of heart-friendly fats than ghee itself.

Carbohydrate and mineral content 🔗

The carbohydrate fraction comes mainly from residual lactose. Additionally, ghee residue provides meaningful amounts of minerals. Calcium, phosphorus, and magnesium content have been reported at 0.78%, 0.72%, and 0.73% respectively, along with trace minerals like iron (138.26 mg/kg), zinc (28.97 mg/kg), copper (18.18 mg/kg), and manganese (9.47 mg/kg). The gross energy value is high at around 7,279 kcal/kg, making it a calorie-dense ingredient.

Phospholipid content: a key differentiator 🔗

One of the most important distinctions between ghee and ghee residue is phospholipid content. During ghee preparation, phospholipids from milk fat are largely retained in the residue rather than passing into the clarified fat. Ghee residue from the creamery butter method can contain as much as 6.27% phospholipids, compared to only trace amounts in finished ghee.

The major phospholipid classes identified in ghee residue include phosphatidylcholine, phosphatidylethanolamine, phosphatidylinositol, phosphatidylserine, and phosphatidylglycerol. These compounds serve dual roles – they function as natural emulsifiers (useful in food formulation) and as potent antioxidants. Recent research at ICAR-NDRI has explored microwave-assisted extraction techniques to efficiently recover these phospholipids for commercial use, achieving yields of 17-21%.

Antioxidant properties of ghee residue 🔗

The antioxidant capacity of ghee residue is one of its most commercially valuable traits. Both lipid and non-lipid components contribute to this activity, creating a multi-layered defence against oxidation.

Lipid-based antioxidants 🔗

Among the lipid constituents, phospholipids demonstrate the strongest antioxidant effect. Specifically, cephalin (phosphatidylethanolamine) shows the greatest antioxidant activity among all phospholipid fractions. Alpha-tocopherol (vitamin E) and vitamin A in the residue also contribute, though to a lesser degree than phospholipids. Research has shown that heating ghee residue with ghee at a 1:4 ratio at 130°C achieves maximum transfer of phospholipids into ghee, boosting its oxidative stability.

Non-lipid antioxidants 🔗

The non-lipid fraction contains free amino acids with antioxidant activity. Proline shows the highest contribution, followed by lysine, cysteine hydrochloride, and tryptophan. The free sulphydryl groups from denatured proteins act as radical scavengers. Additionally, reducing sugars like lactose, glucose, and galactose – and their Maillard reaction products with proteins – further enhance oxidative stability.

Studies have found that the oxidative stability of ghee residue is comparable to that of BHA (butylated hydroxyanisole), a widely used synthetic antioxidant. This positions ghee residue as a viable natural alternative for food preservation, especially in dairy products where synthetic antioxidants are generally avoided.

Effect of clarification temperature 🔗

An important practical detail: antioxidant efficiency decreases as the clarification temperature increases. Ghee residue obtained at lower temperatures (around 110°C) produces fewer peroxides when added to ghee, compared to residue from higher-temperature processing. This means controlling the heat during ghee making is critical for preserving antioxidant quality in the residue.

Flavour properties of ghee residue 🔗

Ghee residue is an exceptionally rich source of flavour compounds. The key flavouring agents are free fatty acids (FFAs), carbonyl compounds, and lactones. What stands out is the concentration: FFA, carbonyl, and lactone levels in ghee residue are respectively 11, 10, and 132 times higher than in ghee. The major lactones include C12, C14, and C18 δ-lactones, which are responsible for the characteristic cooked, caramelized, and nutty aroma.

This concentrated flavour profile has a direct practical application: adding around 10% ghee residue to vanaspati (hydrogenated vegetable oil) or butter oil and clarifying at 120°C can successfully impart an authentic ghee-like flavour. This treatment also improves keeping quality thanks to the residue’s antioxidant compounds.

Food applications of ghee residue 🔗

The combination of nutritional richness, antioxidant capacity, and intense flavour makes ghee residue a versatile ingredient across several food categories.

Confectionery and traditional sweets 🔗

Ghee residue has been successfully incorporated into traditional Indian sweets like burfi, candy, and chocolate. In one study, candy, chocolate, and burfi made with ghee residue scored 7.92, 7.77, and 7.12 out of 9 on sensory evaluation scales, indicating good consumer acceptability. The products maintained quality for up to 30 days in storage. Ghee residue-based chikki (candy) has also been used as a flavouring particulate in confection ice cream, where sugar-based chikki at 8% inclusion was rated superior to control samples.

Bakery products 🔗

Researchers have explored using ghee residue as a fat replacer in biscuits at levels of 10-25%, studying its effects on texture, colour, and sensory properties. Ghee residue has also been incorporated into cake and muffin formulations to boost protein and mineral content while adding a distinctive flavour. Flatbreads and chapati enriched with ghee residue show improved protein content and shelf life.

Snacks and savoury applications 🔗

Snack formulations using ghee residue combined with skim milk powder, rice flour, dry mango powder, and spice mix have been developed and tested. The residue has also been used in edible paste preparations for samosa and dosa fillings, and in pinni – a traditional North Indian sweet made with wheat flour, ghee, dry fruits, and ghee residue at the NDRI model dairy facility in Karnal.

Flavour enhancement in fats and oils 🔗

As mentioned, ghee residue can impart ghee-like flavour to products like vanaspati and butter oil. This application is valuable for the edible oil industry, where achieving an authentic dairy flavour without using actual ghee would reduce costs while improving product appeal.

Non-food applications 🔗

Beyond food, ghee residue has found use as a supplement in animal, poultry, and fish feed due to its high energy and protein content. Research has also explored its potential as a feedstock for biodiesel production and as a substrate for microbial lipase production, further expanding the ways this by-product can be valorized.

Challenges and the road ahead 🔗

Despite its potential, commercial utilization of ghee residue remains limited. There are several reasons: the composition varies widely depending on raw material and preparation method, making standardization difficult. The high moisture content of fresh residue makes it prone to microbial spoilage if not properly dried and stored. And there is simply a lack of awareness among manufacturers about the residue’s value.

Developing standardized processing protocols – controlling heating temperature, duration, and drying techniques – will be essential for producing consistent-quality ghee residue suitable for the food industry. Extraction of high-value components like phospholipids and protein hydrolysates from ghee residue represents a promising frontier that could significantly improve the economics of ghee manufacturing.

What do you think? With India producing tens of thousands of tonnes of ghee residue each year, how can dairy processors be encouraged to treat this by-product as an ingredient rather than waste? Could ghee residue-based products find a place on mainstream retail shelves alongside other functional food ingredients?

References

1. http://ecoursesonline.iasri.res.in/mod/page/view.php?id=5576
2. https://www.shin-norinco.com/article/nutrient-composition-of-ghee-residue-and-their-digestibility-in-chicken
3. http://dairy-technology.blogspot.com/2014/01/ghee-residue.html
4. https://www.sciencedirect.com/science/article/pii/S2666833522000193
5. https://pubmed.ncbi.nlm.nih.gov/41075511/
6. https://www.biochemjournal.com/archives/2024/vol8issue9S/PartR/S-8-9-24-792.pdf
7. https://www.researchgate.net/publication/289532369_PHYSICOCHEMICAL_ANALYSIS_OF_GHEE_RESIDUE_AND_CONVERSION_INTO_CONFECTIONARY_FOOD_PRODUCTS
8. https://www.researchgate.net/publication/339927686_Nutritive_value_of_ghee_residue_incorporated_bakery_product
9. https://www.researchgate.net/publication/375610895_Ghee_Residue_and_its_Application_in_Dairy_and_Food_Industry