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PubMed2004

Sequential in vitro pepsin digestion of uncooked and cooked sorghum and maize samples.

An in vitro protein digestion study, using pepsin, was carried out in uncooked and cooked sorghum and maize flour samples. The digestibility values from the uncooked samples showed that sorghum presents digestibility values similar to those of maize. In the case of the cooked samples, it was found that a wet cooking procedure promotes a decrease in sorghum protein digestibility when compared to maize. Electrophoresis was used to follow the in vitro pepsin sequential digestion procedure, and infrared spectroscopy was applied to establish its efficiency. SDS-PAGE results showed that both uncooked samples (sorghum and maize) behave in a similar way. The wet cooking procedure increases the amount of high molecular weight aggregates and promotes the appearance of two nonreducible and nondigestible 45 and 47 kDa proteins. These two protein fractions are directly related to the loss of digestibility. It was also shown that in cooked sorghum the monomers (gamma-, alpha-, and beta-) are more resistant to digestion than the corresponding uncooked samples.

Digestion↗
PubMed2004

Physicochemical changes in the hull of corn grains during their alkaline cooking.

The alkaline cooking of corn in a solution of Ca(OH)2 to produce corn-based foods is oriented to make corn proteins available, to incorporate Ca to the cooked grains, and also to remove the corn hull. This process (nixtamalization) is known in Mexico and Guatemala from prehispanic times; however, the effect of the alkaline cooking on the corn hull remains poorly documented. In this work, the physicochemical changes that take place in the corn hull during its cooking in a saturated solution of Ca(OH)2 were studied using infrared, X-ray diffraction, 13C cross-polarization/magic-angle spinning (CP/MAS) NMR, confocal imaging microscopy, differential scanning calorimetry, and thermogravimetry techniques. The main effect of this treatment on the hull is the removal of hemicelluloses and lignin, increasing the hull permeability and, as a consequence, facilitating the entry of the alkaline solution into the corn kernel. No significant changes were observed in the cellulose fiber network, which remains as native cellulose I, with a crystalline index, according to 13C CP/MAS NMR spectra, of 0.60. The alkaline treatment does not allow the cellulose fibers to swell and their regeneration in the form of cellulose(II). It seems any attempt to make use of the Ca binding capacity of the hull to increase the Ca availability in nixtamalized corn-based foods requires a separated treatment for the hull and kernel. On alkaline cooking, the hull hemicellulose fraction dissolves, losing its ability to bind Ca as a way to incorporate this element into foods elaborated from nixtamalized corn.

Calcium Hydroxide↗
PubMed2005

Comparison of the bioactive compounds and antioxidant potentials of fresh and cooked Polish, Ukrainian, and Israeli garlic.

Garlic (Allium sativum L.) is an essential part of Polish, Ukrainian, and Israeli cuisine. The aim of this investigation was to compare the changes in bioactive compounds, proteins, and antioxidant potentials in fresh Polish, Ukrainian, and Israeli garlic samples after subjection to cooking temperature. Dietary fiber and essential trace elements were comparable. The antioxidant potentials were determined by four scavenging methods using beta-carotene, 1,1-diphenyl-2-picrylhydrazyl (DPPH), nitric oxide (NO), and 2,2'-azinobis(3-ethylbenzothiazoline-6-sulfonic acid) diammonium salt (ABTS(*)(+)) radical cation with K(2)S(2)O(8) or MnO(2) assays. Polyphenols, tocopherols, proteins, and antioxidant potentials were higher in Polish garlic, but not significantly (P > 0.05). The SDS- and native-PAGE electrophoretic patterns of all three fresh garlic samples were without significant differences. Most of the proteins were in the molecular mass range of 24-97 kDa, and the more intensive major bands were concentrated at 50 and 12 kDa. The 50 kDa protein nearly disappears and the intensity of the 12 kDa lectin bands slightly decreases during cooking. It was observed that the bioactive compounds, antioxidant potential, and proteins in garlic decrease significantly after 20 min of cooking at 100 degrees C (P < 0.05). In conclusion, (a) the bioactive compounds, electrophoretic patterns, and antioxidant potential of fresh Polish, Ukrainian, and Israeli garlic samples are comparable; (b) garlic samples subjected to 100 degrees C during 20 min preserve their bioactive compounds, antioxidant potential, and protein profile and are comparable with fresh garlic; and (c) fresh garlic should be added to dishes cooked at 100 degrees C in the last 20 min of the cooking process.

Antioxidants↗
PubMed2005

Quantitation of carcinogenic heterocyclic aromatic amines and detection of novel heterocyclic aromatic amines in cooked meats and grill scrapings by HPLC/ESI-MS.

A tandem solid-phase extraction method was used to isolate carcinogenic heterocyclic aromatic amines (HAAs) from cooked meats. The following 10 HAAs were identified by HPLC/ESI-MS/MS: 2-amino-9H-pyrido[2,3-b]indole (2-AalphaC), 2-amino-3-methyl-9H-pyrido[2,3-b]indole (MeAalphaC), 2-amino-3-methylimidazo[4,5-f]quinoline (IQ), 2-amino-3-methylimidazo[4,5-f]quinoxaline (IQx), 2-amino-3,8-dimethylimidazo[4,5-f]quinoxaline (8-MeIQx), 2-amino-3,4,8-trimethylimidazo[4,5-f]quinoxaline (4,8-DiMeIQx), 2-amino-3,7,8-trimethylimidazo[4,5-f]quinoxaline (7,8-DiMeIQx), 2-amino-1-methyl-6-phenylimidazo[4,5-b]pyridine (PhIP), 2-amino-1,7,9-trimethylimidazo[4,5-g]quinoxaline (7,9-DiMeIgQx), and 2-amino-1-methylimidazo[4,5-b]quinoline (IQ[4,5-b]); the latter HAA has not previously been reported in cooked meats. The concentrations of these HAAs ranged from <0.03 to 15 ppb in cooked meats and poultry, to 75 ppb in cooked beef extract, and to 85 ppb in grill scrapings. The product ion scan mode was used to confirm the identities of these HAAs. Six other compounds were detected that appear to contain the N-methylimidazoquinoxaline skeleton on the basis of their product ion spectra, and these compounds are probable isomers of IQx, 8-MeIQx, and DiMeIQx. A number of known HAAs and novel HAAs of unknown genotoxic potential are formed at appreciable levels in cooked meats.

Amines↗
PubMed2000

Effect of cooking on banana and plantain texture.

The effect of temperature and duration of cooking on plantain and banana fruit texture and cytpoplasmic and cell wall components was investigated. The firmness of both banana and plantain pulp tissues decreased rapidly during the first 10 min of cooking in water above 70 degrees C, although plantain was much firmer than banana. Cooking resulted in pectin solubilzation and middle lamella dissolution leading to cell wall separation (as observed by SEM). Dessert banana showed more advanced and extensive breakdown than plantain. Although dessert banana had a higher total pectin content than plantain, the former had smaller-sized carboxyethylenediaminetetraacetic acid (CDTA) soluble pectic polymers which are associated with plant tissues that have a propensity to soften. Plantain had higher levels of starch and amylose than banana but this was associated with a firmer fruit texture rather than a softening due to cell swelling during starch gelatinization. Different cooking treatments showed that cooking in 0.5% of CaCl(2) solution and temperatures below 70 degrees C had significant effects on maintenance of pulp firmness.

Fruit↗
PubMed2004

Prospective randomized comparison of two embryo culture systems: P1 medium by Irvine Scientific and the Cook IVF Medium.

PURPOSE: To compare the efficacy of two commercially available in vitro fertilization (IVF) and embryo culture media systems: the glucose-free P1 Medium supplemented with 20% synthetic serum substitute (SSS) (Irvine Scientific), and the Cook IVF Medium (Cook, Australia). METHODS: A prospective randomized study. Medical center-based IVF Unit affiliated to the Faculty of Medicine of Tel Aviv University. IVF patients were randomly assigned to either P1 Medium supplemented with 20% SSS (182 patients, 196 cycles) or Cook Medium (167 patients, 179 cycles). RESULTS: Fertilization rates were similar with both media (52.3 +/- 26.1 and 53.8 +/- 27.6, respectively). Likewise, no difference was found in morphological characteristics and grading of cultured embryos. However, a significantly higher proportion of the embryos incubated in the P1 Medium reached the four-cell stage on day 2 or the 6-cell stage on day 3 postfertilization, compared to those incubated in Cook Medium (54.3% vs. 41.9%, p < 0.0001). Clinical pregnancy and delivery rates were improved when oocytes and embryos were cultured in P1 Medium. Finally, Implantation rate was significantly higher in the P1 Medium Group (9.9% vs. 6%, respectively). CONCLUSIONS: Our results suggest that the P1 Medium may be associated with a higher embryo cleavage rate and improved implantation rates compared to the Cook IVF Medium.

Culture Media↗
PubMed1988

Effect of cooking, pH and polyphenol level on carbohydrate composition and nutritional quality of a sorghum (Sorghum bicolor (L.) Moench) food, ugali.

1. The present work was undertaken to study the effects of cooking, pH and polyphenol level on carbohydrate composition and nutritional quality of sorghum (Sorghum bicolor (L.) Moench). Three different sorghum varieties; Dabar, Feterita and Argentine containing zero, intermediate to low and high levels of polyphenols respectively were used in the study. From these varieties uncooked, uncooked acidified, cooked, and cooked acidified diets were prepared. Diets were characterized with regard to resistant starch (RS), dietary fibre (DF), acid-detergent fibre (ADF) and amino acid content. Raw materials were further analysed for content and composition of non-starch polysaccharides and Klason lignin. The nutritional properties were studied in balance trials with rats. True protein digestibility (TD), biological value (BV), net protein utilization, digestible amino acids, digestible energy (DE) and digestible DF were used as criteria in the nutritional study. 2. Cooking at neutral and acid pH resulted in significantly higher assayed values for DF. Increase in DF could be accounted for by formation of RS. Approximately 50% of RS was recovered in the faeces. 3. In vitro values for protein associated with ADF and in vivo balance values using rats suggest that an endosperm protein fraction, kafirins, was made unavailable during cooking. This resulted in reduced TD and increased BV. It is assumed that unavailable kafirins serve as a nitrogen source for microflora in the hind-gut. 4. Dietary polyphenols changed the excretory route for N from urine to faeces. This resulted in lower TD and higher BV in Argentine (high in polyphenols) than in Dabar and Feterita (low in polyphenols), although dietary lysine (first limiting amino acid) was the same in the three varieties. 5. Variation in DE of the diets was attributed to DF, RS and the amount of faecal protein, which in turn were influenced by undigested kafirins and polyphenols.

Animals↗
PubMed1995

Lack of aberrant crypt promotion and of mutagenicity in extracts of cooked casein, a colon cancer-promoting food.

Dietary casein cooked at 180 degrees C promotes the growth of aberrant crypt foci and colon cancer in rats initiated with azoxymethane. We speculated that promotion was due to a product that could be extracted by a solvent, such as 5-hydroxymethyl-2-furaldehyde (HMF), with tumor- promoting activity or the carcinogenic heterocyclic aromatic amines (HAA). This hypothesis was tested by extracting cooked casein with solvents and water. The extracts were then 1) assayed by high-performance liquid chromatography for HMF and HAA, 2) measured for mutagenicity on a frame-shift-sensitive strain of Salmonella typhimurium, and 3) fed for 100 days to azoxymethane-initiated rats to test the promoting effect on aberrant crypt foci. Data show that 1) no HMF or HAA was detected in cooked casein, 2) no mutagenicity was detected on strain TA98, with or without metabolic activation, and 3) promotion was not associated with the extracts but with the cooked casein residue. Therefore the promotion by cooked casein would not appear to be associated with a product that can be extracted by solvents.

Animals↗
PubMed2001

The effects of domestic cooking on the levels of 3-monochloropropanediol in foods.

The results are reported of a study to determine the effect of domestic cooking procedures on the level of 3-monochloropropane-1,2-diol (3-MCPD) in selected foods. Samples of 23 foods comprising stock cubes, gravies, a cake mix, batters, breads, cheese and meats were subjected to a range of cooking procedures including grilling, toasting and microwaving. The resulting levels of 3-MCPD were compared with those present in the foods before cooking. Grilling and toasting produced substantial increases in the 3-MCPD content of bread, forming up to 0.3 mg/kg, and of most cheeses, resulting in levels of up to about 0.1 mg/kg. Microwave cooking produced elevated 3-MCPD levels in some cheeses. Frying laboratory-produced batters increased 3-MCPD levels to about 0.1 mg/kg whereas a retail batter contained no detectable 3-MCPD when fried. The remaining foods showed little or no discernible increase on cooking.

Bread↗
PubMed2003

Effect of cooking on the formation of N-nitrosodimethylamine in Korean dried seafood products.

Only N-nitrosodimethylamine (NDMA) was detected when N-nitrosamines (NA) were analysed in seven dried seafood products, either uncooked or cooked. The cooking methods used were a briquet fire, a gas range, an electric oven, a microwave oven, a steam cooker and an electric coil cooker. The contents of NDMA ranged from 1.0 to 46.9 microgram kg(-1) in uncooked products. When these samples were cooked, regardless of the cooking method, the content of NDMA tended to increase, ranging from 1.1 to 630.5 microgram kg(-1). In general, indirect heating such as a steam cooker and a microwave oven, as compared with direct heating such as a gas range and a briquet fire, caused less increase in NDMA during cooking.

Animals↗
PubMedDate not supplied

Socioeconomic status, body size and physical activity of adults on Rarotonga, the Cook Islands.

Much of the secular trend toward increased body size among populations in the Pacific Region has been attributed to the processes of economic modernization and socioeconomic change. The primary objective of the present analysis was to examine the relationships between socioeconomic factors and stature, weight, body mass index and physical activity level of adult Cook Islanders living a largely modernized lifestyle in the Pacific Region. In a cross-sectional study of physical activity, body size and socioeconomic status, a volunteer sample of 345 Cook Islanders aged 20-65 years was obtained from the total adult population of Rarotonga, and measured at six out-patient clinics. Stature, weight, body mass index (BMI), physical activity level and age were calculated by sex and occupational category, years of education, island of birth and number of years lived on Rarotonga, respectively, using SPSSPC for Windows. Stepwise multiple regression was used to examine the relationships between stature, weight, BMI, PALweekday (a measure of physical activity level), age and non-linear functions of age, and the socioeconomic variables. These analyses indicate that the secular trend in stature is a function of the relative level of modernization on Rarotonga relative to other Cook Islands, and with level of education. These factors associate differently among males and females, the secular trend among males appearing to be a general phenomenon in response to lifestyle change associated with life on Rarotonga, while among females the trend is a function of lifestyle change associated with education and independent of island of origin. The trend toward increasing body fatness is also different for males and females. Weight declines with age for both men and women, in a linear way for the males, but in a non-linear fashion for the females. Body weight is also greater among those males in more skilled and professional occupations than among those with less-skilled professions. For the women, weight is independent of occupation category. Physical activity patterns of modernizing adult Cook Islanders show no relationships with socioeconomic variables for the males, but while older women are less active, those born on Rarotonga are less active than those born elsewhere in the Cook Islands. The number of years spent on Rarotonga shows no significant relationships with any of the physical measures, or with physical activity level. This is likely to be as much a function of small sample size as a lack of effect. Although declines in energy expenditure with increasing age have been demonstrated for both males and females in various populations around the world, on Rarotonga this holds true for females and not males, indicating that physical activity declines with increasing age in modernizing societies do not occur in uniform fashion.

Adult↗
PubMed1997

Microbiological quality of cooked chicken breasts containing commercially available shelf-life extenders.

Experiments were conducted to determine the effect of various shelf-life extenders on the aerobic plate counts (APC) of cooked chicken breast meat stored at refrigeration temperatures. Fresh chicken breast meat obtained from local grocers was injected with either 0.5, 1, 1.5, or 2% sodium lactate; 0.63, 1.25, 1.88, or 2.51 g/kg of a liquid smoke flavoring; 0.33, 0.66, 1, or 1.33% Per/Lac 1901, a fermented whey product; or 0.25, 0.5, 0.75, or 1% Alta 2341, a fermented corn syrup product. The samples were cooked at 85 C dry bulb, 77.8 C wet bulb to an internal temperature of 76.7 C. The cooked chicken breasts were cut into 20-g samples and aseptically placed into Ziploc bags. Initial APC were enumerated following 2-d incubation at 30 C. Additional stored samples (2 C) were subsequently evaluated for APC every week for 5 wk. Only one of the four ingredients, Alta 2341, significantly extended cooked breast meat shelf-life over that of the controls. Using Alta 2341 would be beneficial in extending the refrigerated shelf-life of cooked chicken breast meat up to 5 wk.

Analysis of Variance↗
PubMed2002

Color of uncooked and cooked broiler leg quarters associated with chilling temperature and holding time.

Discoloration of raw or cooked tissue can occur from cell disruptions and blood migration caused by slow or variable chilling rates. Color parameters established by the Commission International D'Eclairage for measuring lightness, redness, and yellowness (L*, a*, and b* respectively) were determined on two groups (A and B) of uncooked and cooked leg quarters chilled at +4, 0, -3, -12, or -18 C. At Day 7, group A was evaluated for color, and group B was moved to -18 C for seven additional days and then evaluated. Group B represented cooling, freezing, thawing, and cooking steps. Color was measured on surfaces of thawed, uncooked parts (UCS), on surfaces of cooked parts (CS) 75 or 85 C internal temperature), and on cooked meat (CM) adjacent to the femur. UCS samples at -3 C were significantly redder (a* = 8.91) than -18 C samples (a* = 5.04). The A-CS a* values showed a significant interaction between chill temperature storage and internal temperature (IT). Samples at 75 C IT had higher a* values (redder). CM samples held at +4 and 0 C were significantly lighter (higher L* values). A significant interaction effect occurred for CM a* values due to storage chill temperature and IT. Generally, 75 C IT samples were redder (higher a* values). UCS and CS color was not influenced by chilling at +4 to -18 C for 7 d and then at -18 C for 7 d. CM was affected by a combination of chill temperature history and IT.

Animals↗
PubMed1990

Heart healthy cook-offs in home economics classes: an evaluation with junior high school students.

The Pawtucket Heart Health program works closely with the 23 parochial and public schools in Pawtucket, R.I., to educate students and teachers about heart health promotion. As part of that partnership, the PHHP developed a program to teach junior high school home economics students about nutrition, food purchasing techniques, and heart healthy cooking methods. In this Heart Healthy Cook-off program, the PHHP distributes recipe guidelines to home economics teachers who instruct students in recipe modification, food preparation, and presentation. Students choose recipes and make heart healthy substitutions to lower fat and sodium content. Recipes are analyzed for nutrient content by the PHHP and returned to the students with suggestions for lowering fat and sodium if necessary. Final recipes are judged for heart healthiness by a nutritionist and for taste by a panel of judges. Prizes are awarded to students with winning recipes. Before and after the Cook-offs, classes host a blood cholesterol SCORE (screening, counseling, and referral event) where students learn about their blood cholesterol level and its relationship to dietary intake. In 1988-1989, 105 junior high school students participated in the Cook-off/SCORE program. Forty percent had elevated blood cholesterol levels of 170 mg/dl or above. A statistically significant decrease in blood cholesterol levels was observed during a 12-week time period. The Cook-off is a fun, effective program for teaching secondary school students about heart healthy eating habits.

Adolescent↗
PubMed1994

Mutagenic activity of heterocyclic amines in cooked foods.

Mutagenic heterocyclic amines are generated in foods when they are cooked at temperatures over 150 degrees C. These compounds are present from 0.1 to 50 ppb, depending on the food and cooking conditions. These heterocyclic amines are not only present in cooked red meat, fish, and chicken, but are also present at lower levels in baked and fried foods derived from grain. Mutagenicity of fried beef hamburgers cooked at 230 degrees C is 800 +/- 37 TA98 revertants per gram cooked weight. We measured 2-amino-3,8-dimethylimidazo[4,5-f]quinoxaline (MelQx), 2-amino-3,4,8-trimethylimidazo[4,5-f]quinoxaline (DiMelQx), and 2-amino-3-methylimidazo[4,5-f]quinoline (IQ) formation at this temperature and found 3.0 +/- 2.0, 1.0 +/- 0.18, and 0.06 +/- 0.03 ng/g, respectively. 2-amino-1-methyl-6-phenylimidaz[4,5-b]pyridine (PhIP) was found at a higher concentration of 9.6 ng/g. In our laboratory we have shown these heterocyclic amines are capable of producing both reverse and forward mutations in Salmonella bacteria and forward mutations in Chinese hamster ovary cells (CHO). We have also been able to show a statistically significant increase in mutations in the pancreas of the "mutamouse" following PhIP exposure. The pancreas also shows relatively high DNA binding compared to other organs in the mouse. The number and type of mutations depend on the repair capacity of the cells for both Salmonella and CHO. In Salmonella the mutations are primarily 2-base deletions when the cells lack uvrB repair, but mutations are more complex (larger deletions and insertions) but lower in frequency when repair is functional.(ABSTRACT TRUNCATED AT 250 WORDS)

Amines↗
PubMedDate not supplied

[Iron content of infant diets cooked in iron utensils].

Iron deficiency is the most frequent form of nutritional anemia, and infants represent one of the major risk groups. The present study was meant to evaluate the iron content of infant diets cooked in iron utensils and in aluminum utensils prepared by volunteer mothers at home. The iron content was analyzed by atomic absorption spectrophotometry. The increase of iron in diets cooked in iron utensils was 12 to 44 times greater than in diets cooked in aluminum utensils. The pH and moisture of the diets cooked in the two types of utensils did not differ in a statistically significant manner. On the basis of these results, it was estimated that the increase in daily iron supply obtained by cooking the diet in iron utensils would be sufficient to satisfy the iron requirements of infants.

English Abstract↗
PubMed1990

Effect of high-energy electron irradiation of chicken meat on thiobarbituric acid values, shear values, odor, and cooked yield.

Experiments were conducted to determine whether electron-beam irradiation would affect shear values, yield, odor, and thiobarbituric acid (TBA) values of chicken tissues. Broiler breasts (pectoralis superficialis) and whole thighs were irradiated with an electron-beam accelerator at levels to produce adsorbed doses of 100, 200, and 300 krads on the surface of the sample. The thigh samples were stored for 2, 4, and 8 days before testing for TBA values. The depth to which the radiation had penetrated the pectoralis superficialis muscle was also determined. Radiation penetrated 22 mm into slices of pectoralis superficialis muscle when 100 krad was absorbed by the surface of the tissue. The dose absorbed beneath the tissue surface to a depth of 10 mm was larger than the dose absorbed at the surface. The absorbed dose decreased as the depth of penetration increased. For cooked breast tissue, the shear values and moisture content were not affected by the absorbed radiation. Cooking losses of aged breast tissue were not affected by irradiation, but cooking losses were reduced in breast tissue that had not been aged. Irradiating uncooked thigh and uncooked breast samples produced a characteristic odor that remained after the thighs were cooked but was not detectable after the breast samples were cooked. With two exceptions, no significantly different TBA values were found that could be attributed to irradiation.

Animals↗
PubMed1996

Effect of cooking fuels on respiratory diseases in preschool children in Lucknow, India.

The association between cooking fuels and the risk of respiratory disease in preschool children in Lucknow, India was studied. We interviewed mothers of 650 study children, randomly selected from among 28 urban poor neighborhoods. Children were eligible if they were less than five years of age, free of congenital heart disease, malignancy, and compromised immune status. Respiratory disease (defined as one or more of the following: runny nose, cough, sore throat, breathlessness, and noisy respiration) was assessed by observation. Exposures included the types of cooking fuels and duration of their use in the last week and other potential predictors of respiratory disease. Odds ratios (ORs) for disease were adjusted for covariables using multiple logistic regression. The point prevalence of respiratory disease was 14.5%. Cooking fuels used were wood (56.0%), kerosene (24.2%), coal (19.2%), gas (15.4%), and dung cakes (8.6%). Use of dung cakes, a sun-dried mixture of cow or buffalo dung and straw, as cooking fuel was associated with respiratory disease (adjusted OR = 2.69, 95% confidence interval [CI] = 1.37-5.31, P = 0.004), as was overcrowding in the bedroom (adjusted OR = 1.25 for each additional person, 95% CI = 1.11-1.41, P = 0.001). Age, weight, gender, family income, and household structure were not associated with disease. Use of dung cakes as cooking fuel and overcrowding in the bedroom increased the risk of respiratory disease. Interventions to modify oven design or install chimneys and, where feasible, to reduce the number of people sleeping together should be considered.

Child, Preschool↗