title: Physical properties and composition of femurs of rat fed with diets based on corn tortillas made from different processes.
abstract: In this study the effect of calcium absorption on some physical properties and composition of rat femurs was evaluated, comparing rats fed with raw whole corn (RC), tortillas made from extruded masa with 0.25% lime content (TEWL) and without lime (TE), and nixtamal tortillas (NT). The diets were formulated to contain the same amount of protein, oil, fiber, vitamins and minerals other than calcium. In all diets 0.20% calcium was added. At the end of the trials, the femurs were extracted, weighed and measured for ash, calcium and phosphorus content, some physical dimensions, and the crystallinity percentage. The femurs of rats fed with TEWL and NT were heavier, thicker, longer and had higher calcium content. On the other hand, the force required to break the femur of rats fed on ETWL and NT was 1.25 kg greater than that required to break the femurs of rats fed with RC. Higher crystallinity percentage values were observed in the femurs of the rats fed with NT (37.66%) and TEWL (36.98%) as compared to a 30.31% value obtained with the RC.
authors.affiliation: Centro de Investigacion en Ciencia Aplicada y Tecnología Avanzada del IPN, Jose Siurob 10, Col. Alameda, Queretaro, Mexico.
authors.forename: H E
authors.initials: HE
authors.lastname: Martínez-Flores
authors.forename: J D C
authors.initials: JD
authors.lastname: Figueroa
authors.forename: F
authors.initials: F
authors.lastname: Martínez-Bustos
authors.forename: J
authors.initials: J
authors.lastname: Gonzalez-Hernandez
authors.forename: M E
authors.initials: ME
authors.lastname: Rodriquez García
authors.forename: A M L
authors.initials: AM
authors.lastname: Baños López
authors.forename: M G
authors.initials: MG
authors.lastname: Garnica-Romo
mesh_terms: D000818:Animals; D002118:Calcium / Q000032:analysis; D017610:Calcium Compounds / Q000494:pharmacology; D002136:Calcium, Dietary / Q000008:administration & dosage; D004032:Diet; D005269:Femur / Q000033:anatomy & histology / Q000737:chemistry / Q000502:physiology*; D005511:Food Handling / Q000379:methods*; D005527:Food, Fortified / Q000032:analysis*; D008297:Male; D010087:Oxides / Q000494:pharmacology; D010758:Phosphorus / Q000032:analysis; D051381:Rats; D017208:Rats, Wistar; D013314:Stress, Mechanical; D015430:Weight Gain; D014961:X-Ray Diffraction; D003313:Zea mays / Q000737:chemistry*
chemical_list: D017610:Calcium Compounds; D002136:Calcium, Dietary; D010087:Oxides; D010758:Phosphorus; C016538:lime; D002118:Calcium