What Makes a Pakora Batter Set: Chickpea Protein and Starch

What Gluten Does named the mechanism gluten-free doughs are missing: gliadin and glutenin, two wheat proteins that get chemically welded together into an elastic, disulfide-bonded network when a dough is worked. Besan has neither protein — it isn’t wheat, so there’s no gliadin-glutenin pair to miss in the first place. And yet a pakora batter, built from nothing but besan, water and spice, still goes from a loose slurry to a set, holding coating the moment it hits hot oil. If gluten isn’t the thing doing that job, something else is.

Besan is not mostly protein

It’s tempting to credit besan’s “binding” reputation to protein, but chickpea flour isn’t actually a protein-heavy ingredient by weight. A food-science study of chickpea flour and its isolated starch put the flour’s own protein content at a bit over a fifth, with total starch close to half — a bigger share of the flour than protein by a wide margin. A separate nutrition database lists broadly the same split: protein well under a quarter of the flour, with most of the remainder sitting in the carbohydrate category that starch belongs to. Starch, not protein, is the majority ingredient inside besan — which matters, because the thing that happens to starch under heat is a completely different mechanism than anything gluten does.

What the starch does once the batter hits hot oil

Starch granules don’t do anything on their own at room temperature; they need water and heat together. That combination is what triggers gelatinization — the granules absorb water and swell, which is the first and most basic way a flour-and-water batter starts building any structure at all. A kinetics study of chickpea-flour muffin batter describes exactly this opening move: as the batter heats, starch granules begin to swell and increase in volume, and the paper’s own conclusion is blunt about what’s actually responsible for the batter firming up — the strengthening of the network is based on starch gelatinization, not on any protein scaffold. That’s the inverse of wheat dough, where gluten’s protein network is the structural lead and starch is comparatively passive.

What the protein is doing at the same time

Starch isn’t working alone, though. Chickpea’s protein is mostly globulin — a different structural category from wheat’s gliadin and glutenin — and globulins have their own heat response. As the batter’s temperature climbs, those globulin proteins denature: they lose their compact folded shape and expose interior regions that were previously tucked away inside the molecule, the opening step that lets proteins stick to each other and to the surrounding matrix. A separate study of heated chickpea-flour dispersions makes the same general point — the rise in the batter’s thickness as it heats comes from starch gelatinization and protein denaturation happening together, not from either process alone.

Chickpea’s two main globulins, legumin and vicilin, don’t even denature on the same schedule. A heat-scan study of chickpea flour found two distinct thermal transitions: the earlier one lines up with both starch gelatinization and vicilin’s denaturation, while a separate, later transition belongs to legumin unfolding on its own. The protein side of the batter isn’t one simple event — it’s two different proteins doing their structural work at two different points on the way up to frying temperature, layered on top of whatever the starch is doing at the same time.

Why besan doesn’t need gluten to begin with

Put the two findings together and the besan batter picture looks nothing like wheat dough’s. Gluten is specifically wheat’s gliadin-glutenin pair, chemically cross-linked through disulfide bonds into a stretchy, recoiling network — and besan simply carries neither protein, so there’s no gluten network to be missing. What besan has instead is a starch majority that gelatinizes into a swollen, viscous matrix, with a smaller globulin fraction denaturing and aggregating into that matrix at its own pace. Two different ingredients doing two different jobs, running on two different timelines, add up to a batter that sets — just not through anything resembling gluten’s springy recoil. That’s consistent with the lab’s running frame: a substitute doesn’t have to replicate the traditional ingredient’s exact mechanism, only hit the structural job it was doing, and besan was never trying to reproduce gluten’s elasticity in the first place.

What this means for the lab’s Method Showdowns

This predicts a real split in how pakora batter’s contenders will need to be judged once that showdown reaches the fryer. Psyllium husk plus egg brings a hydrogen-bonded cohesion mechanism plus egg’s own heat-set protein, neither of which is starch gelatinization — so a psyllium-and-egg batter should set by a different route than besan’s starch-plus-globulin combination, even if the final coating looks similarly crisp. Almond flour carries little starch at all, so a batter built on it would have to rely almost entirely on its protein and fat content (and whatever binder is added) to hold together, without besan’s gelatinizing-starch majority to lean on. Flaxseed meal’s mucilage is a hydrocolloid gel, closer to psyllium’s mechanism than to starch’s. None of that makes any contender wrong — it means the scorecard’s texture notes should track which mechanism a contender is actually running on, not just whether the fried piece holds its shape.

Caveat: the sources behind this post measured chickpea flour and chickpea-flour-based batters and dispersions directly, but none of them fried an actual pakora or compared besan against almond flour, psyllium or flaxseed meal under real frying conditions — that comparison is what the Method Showdown is for. The protein and starch percentages above come from one food-science study of a single chickpea line, so treat them as directional rather than a fixed figure for every batch of besan.

Next: with besan’s own structural mechanism mapped, the next useful comparison is how a protein-and-fat flour with almost no starch — almond flour again, from a batter angle this time — behaves when it has no gelatinizing majority ingredient to fall back on.

Sources

• Studies for Physicochemical and In Vitro Digestibility Characteristics of Flour and Starch from Chickpea (Cicer arietinum L.) — Preventive Nutrition and Food Science (Korea Science): chickpea flour’s protein, total starch and amylose content.
• Gram flour — Wikipedia: besan’s protein, carbohydrate and fiber content per serving, for comparison.
• Rheometric Non-Isothermal Gelatinization Kinetics of Chickpea Flour-Based Gluten-Free Muffin Batters with Added Biopolymers — PMC (Foods): starch granule swelling in a heated chickpea-flour batter, and starch gelatinization as the basis of the batter’s structure.
• Heat-Induced Gelation of Chickpea and Faba Bean Flour Ingredients — PMC (Gels): globulin protein denaturation exposing interior regions on heating, and the separate thermal transitions for vicilin and legumin.
• The Impact of High-Pressure Homogenization and Thermal Processing on the Functional Properties of De-Fatted Chickpea Flour Dispersion — PMC: starch gelatinization and protein denaturation occurring together as chickpea flour dispersions heat.
• Gluten — Wikipedia: gluten forms specifically from wheat’s gliadin and glutenin.