Q110: Which among the following is a pre-requisite for low methoxyl... - Technology of Food Emulsions, Foams and Gels - Dairy Technology- ICAR JRF/SRF 2024 | Agrigyan
Pectins are categorized based on their Degree of Esterification (DE):
High-Methoxyl Pectin (HMP, $\text{DE} \gt 50\%$): Requires high soluble solids ($\gt 55-65\%$ sugar) and low $\text{pH}$ ($2.8-3.5$) for gelation through hydrophobic interactions and hydrogen bonding.
Low-Methoxyl Pectin (LMP, $\text{DE} \lt 50\%$): Gels across a wide $\text{pH}$ range ($2.5-6.5$) without high sugar, but strictly requires the presence of divalent cations (predominantly $\text{Ca}^{2+}$).
Calcium ions bridge ionized carboxylate groups ($-COO^-$) between adjacent polygalacturonate chains, forming junction zones according to the classic "egg-box" model.
Correct Option: Option 1 (Presence of divalent cations).
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