Effect of Steeping Corn with Lactic Acid on Starch Properties
Pasting and thermal properties of starch from corn steeped in the presence of lactic acid and at different steeping times (8, 16, 24, 32, and 40 hr) were investigated. Corn kemels were steeped at 52°C with 0.2% (w/v) SO 2 and with and without 0.5% (v/v) lactic acid. The isolated starch obtained by c...
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2004
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00090352_v81_n1_p10_Haros http://hdl.handle.net/20.500.12110/paper_00090352_v81_n1_p10_Haros |
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paper:paper_00090352_v81_n1_p10_Haros2023-06-08T14:33:26Z Effect of Steeping Corn with Lactic Acid on Starch Properties Haros, Claudia Mónica Pérez, Oscar E. amylopectin amylose lactic acid lipid starch sulfur dioxide article corn degradation differential scanning calorimetry enthalpy food processing hydrolysis melting point paste suspension thermal analysis viscosity Zea mays Pasting and thermal properties of starch from corn steeped in the presence of lactic acid and at different steeping times (8, 16, 24, 32, and 40 hr) were investigated. Corn kemels were steeped at 52°C with 0.2% (w/v) SO 2 and with and without 0.5% (v/v) lactic acid. The isolated starch obtained by corn wet-milling was characterized by determining starch recoveries, retrogradation, and melting transition properties of the lipid-amylose complex by differential scanning calorimetry (DSC), and pasting properties by the Rapid Visco Analyser (RVA). Damaged granules and the starch granule size were determined by using microscopic techniques. Starches from corn steeped in the presence of lactic acid (LAS) were compared with control starch (CS) steeped without lactic acid. Greater starch recoveries were obtained for LAS samples than for CS samples, and practically no damaged starch was present in the former preparations. The presence of lactic acid affected the RVA profiles and steeping time affected the viscosities of the starch suspensions. In general, the RVA parameters of LAS suspensions were lower than those of CS suspensions. No great modification of the thermal properties was observed; only a slight decrease in amylopectin retrogradation and in the melting enthalpy of the amylose-lipid complex was observed. Hydrolysis of the starch during steeping seems the most probable explanation to the starch modifications produced by lactic acid addition. Fil:Haros, M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Perez, O.E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2004 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00090352_v81_n1_p10_Haros http://hdl.handle.net/20.500.12110/paper_00090352_v81_n1_p10_Haros |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
amylopectin amylose lactic acid lipid starch sulfur dioxide article corn degradation differential scanning calorimetry enthalpy food processing hydrolysis melting point paste suspension thermal analysis viscosity Zea mays |
| spellingShingle |
amylopectin amylose lactic acid lipid starch sulfur dioxide article corn degradation differential scanning calorimetry enthalpy food processing hydrolysis melting point paste suspension thermal analysis viscosity Zea mays Haros, Claudia Mónica Pérez, Oscar E. Effect of Steeping Corn with Lactic Acid on Starch Properties |
| topic_facet |
amylopectin amylose lactic acid lipid starch sulfur dioxide article corn degradation differential scanning calorimetry enthalpy food processing hydrolysis melting point paste suspension thermal analysis viscosity Zea mays |
| description |
Pasting and thermal properties of starch from corn steeped in the presence of lactic acid and at different steeping times (8, 16, 24, 32, and 40 hr) were investigated. Corn kemels were steeped at 52°C with 0.2% (w/v) SO 2 and with and without 0.5% (v/v) lactic acid. The isolated starch obtained by corn wet-milling was characterized by determining starch recoveries, retrogradation, and melting transition properties of the lipid-amylose complex by differential scanning calorimetry (DSC), and pasting properties by the Rapid Visco Analyser (RVA). Damaged granules and the starch granule size were determined by using microscopic techniques. Starches from corn steeped in the presence of lactic acid (LAS) were compared with control starch (CS) steeped without lactic acid. Greater starch recoveries were obtained for LAS samples than for CS samples, and practically no damaged starch was present in the former preparations. The presence of lactic acid affected the RVA profiles and steeping time affected the viscosities of the starch suspensions. In general, the RVA parameters of LAS suspensions were lower than those of CS suspensions. No great modification of the thermal properties was observed; only a slight decrease in amylopectin retrogradation and in the melting enthalpy of the amylose-lipid complex was observed. Hydrolysis of the starch during steeping seems the most probable explanation to the starch modifications produced by lactic acid addition. |
| author |
Haros, Claudia Mónica Pérez, Oscar E. |
| author_facet |
Haros, Claudia Mónica Pérez, Oscar E. |
| author_sort |
Haros, Claudia Mónica |
| title |
Effect of Steeping Corn with Lactic Acid on Starch Properties |
| title_short |
Effect of Steeping Corn with Lactic Acid on Starch Properties |
| title_full |
Effect of Steeping Corn with Lactic Acid on Starch Properties |
| title_fullStr |
Effect of Steeping Corn with Lactic Acid on Starch Properties |
| title_full_unstemmed |
Effect of Steeping Corn with Lactic Acid on Starch Properties |
| title_sort |
effect of steeping corn with lactic acid on starch properties |
| publishDate |
2004 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00090352_v81_n1_p10_Haros http://hdl.handle.net/20.500.12110/paper_00090352_v81_n1_p10_Haros |
| work_keys_str_mv |
AT harosclaudiamonica effectofsteepingcornwithlacticacidonstarchproperties AT perezoscare effectofsteepingcornwithlacticacidonstarchproperties |
| _version_ |
1768545354820616192 |