TY - JOUR

T1 - Application of thermally assisted high hydrostatic pressure to modify sorghum starch

T2 - multi-scale structure, techno-functional properties and digestibility

AU - Oliveira, Ludmilla de Carvalho

AU - Gouseti, Ourania

AU - Macnaughtan, Bill

AU - Clerici, Maria Teresa Pedrosa Silva

AU - Sampaio, Ulliana

AU - Bakalis, Serafim

AU - Muttakin, Syahrizal

AU - Cristianini, Marcelo

N1 - Publisher Copyright: © Association of Food Scientists & Technologists (India) 2024.

PY - 2024

Y1 - 2024

N2 - The effects of high hydrostatic pressure (HHP) (400–650 MPa) and holding temperature (25–50 °C) in thermally assisted HHP processing on multi-scale structure of starch (granule, crystalline and molecular), techno-functional properties, and digestibility of sorghum starch (SS) were evaluated. Response surface methodology has verified that the process impact on the modification of SS was dependent primarily on the pressure level. As HHP increased, processed SS progressively lost their granular structure and Maltese cross, indicating gradual structural disorder within the granules. These findings were associated with larger particles, resulting from increased swelling of the granules. The enthalpy changes of crystallite melting decreased from 22.7 (SS) to 0.1–26.9 J/g as a result of increases in pressure and temperature. Measurements of long- and short-range order of SS showed granules have not been completely gelatinized during processing. Water absorption index (1.7–5.4 g/g) and cold viscosity (52.7–94.3 cP) increased as pressure increased, against lowered gel strength (0.80–1.44 N), peak (1394–2735 cP), final (1499–3103 cP) and setback viscosities (233–1288 cP). Increased RS (27.3–35.8%) in processed SS was attributed to the amylose–lipid complex. The process did not affect RDS compared to native SS, but it decreased SDS. Combinations of HHP and temperature demonstrated the potential to produce different versions of physically modified SS suitable for a wide range of applications.

AB - The effects of high hydrostatic pressure (HHP) (400–650 MPa) and holding temperature (25–50 °C) in thermally assisted HHP processing on multi-scale structure of starch (granule, crystalline and molecular), techno-functional properties, and digestibility of sorghum starch (SS) were evaluated. Response surface methodology has verified that the process impact on the modification of SS was dependent primarily on the pressure level. As HHP increased, processed SS progressively lost their granular structure and Maltese cross, indicating gradual structural disorder within the granules. These findings were associated with larger particles, resulting from increased swelling of the granules. The enthalpy changes of crystallite melting decreased from 22.7 (SS) to 0.1–26.9 J/g as a result of increases in pressure and temperature. Measurements of long- and short-range order of SS showed granules have not been completely gelatinized during processing. Water absorption index (1.7–5.4 g/g) and cold viscosity (52.7–94.3 cP) increased as pressure increased, against lowered gel strength (0.80–1.44 N), peak (1394–2735 cP), final (1499–3103 cP) and setback viscosities (233–1288 cP). Increased RS (27.3–35.8%) in processed SS was attributed to the amylose–lipid complex. The process did not affect RDS compared to native SS, but it decreased SDS. Combinations of HHP and temperature demonstrated the potential to produce different versions of physically modified SS suitable for a wide range of applications.

KW - Resistant starch

KW - Starch hydrolysis

KW - Swelling

KW - Unconventional starch

U2 - 10.1007/s13197-024-06014-z

DO - 10.1007/s13197-024-06014-z

M3 - Journal article

AN - SCOPUS:85196860152

JO - Journal of Food Science and Technology

JF - Journal of Food Science and Technology

SN - 0022-1155

ER -