Determination of Fatty Acids in the Subcutaneous Fat of Iberian Breed Swine by near Infrared Spectroscopy. A Comparative Study of the Methods for Obtaining Total Lipids: Solvents and Melting with Microwaves

2002 ◽  
Vol 10 (4) ◽  
pp. 257-268 ◽  
Author(s):  
Inmaculada González-Martín ◽  
Claudio González-Pérez ◽  
Jesús Hernández-Méndez ◽  
Noelia Álvarez-García ◽  
Sofía Merino Lázaro
Keyword(s):  
Fatty Acids ◽  
Saturated Acid ◽  
Near Infrared ◽  
External Validation ◽  
Subcutaneous Fat ◽  
Correlation Coefficients ◽  
Total Lipids ◽  
Multiple Correlation ◽  
Multiple Correlation Coefficients

Near infrared (NIR) spectroscopy has been used to predict the composition of the fatty acids of samples of subcutateous fat from Iberian breed swine, comparing the two methods employed for collecting total lipids—extraction with solvents and microwave melting—using gas chromatography as a reference method. The regression method used was modified partial least squares. The calibration results for 115 samples of subcutaneous fat extracted with solvents and the calibration measured with NIR permitted the determination of 12 fatty acids: C12:0, C14:0, C16:0, C16:1, C17:0, C17:1, C18:0, C18:1, C18:2, C18:3, C20;0 and C20:1, total polyunsaturated, total monosaturated and total saturated acid with squared multiple correlation coefficients of 0.84, 0.70, 0.89, 0.75, 0.62, 0.66, 0.85, 0.91, 0.88, 0.77, 0.85, 0.66, 0.90, 0.89 and 0.92, respectively, and a standard error of calibration ( SEC) for these acids (%) of 0.007, 0.091, 0.48, 0.14, 0.03, 0.03, 0.42, 0.72. 0.31, 0.09, 0.02, 0.15, 0.31, 0.70 and 0.68, respectively. Extraction of total lipids by microwave melting for the same samples and using NIR calibration allowed the determination of six fatty acids: C16:0, C16:1, C18:0, C18:1, C18:2, C18:3, total polyunsaturated, total monounsaturated and total saturated acid, with a squared multiple correlation coefficients ( RSQ) of 0.93, 0.70, 0.88, 0.90, 0.83, 0.63, 0.82, 0.92 and 0.95, respectively, and an SEC for these acids (%) of 0.36, 0.14, 0.44, 0.77, 0.33, 0.08, 0.39, 0.69 and 0.56, respectively. The robustness of the two extraction methods and of the determination was checked by applying them to 20 samples for external validation.

scholarly journals Spectral Noise Levels and Roughness Severity Ratings for Normal and Simulated Rough Vowels Produced by Adult Males

1970 ◽  
Vol 13 (3) ◽  
pp. 489-502 ◽  
Author(s):  
Frank E. Sansone ◽  
Floyd W. Emanuel
Keyword(s):  
Correlation Coefficients ◽  
Adult Males ◽  
Noise Levels ◽  
Multiple Correlation ◽  
Acoustic Spectrum ◽  
Spectral Components ◽  
Multiple Correlation Coefficients ◽  
The Individual ◽  
Spectral Ranges ◽  
The Relationship

Twenty normal-speaking adult males sustained productions of each of the vowels /u/, /i/, /Λ/, /a/, and /æ/ first normally and then with simulated vocal roughness at one intensity. A tape recording of each production was rated for roughness on a five-point equal-appearing-intervals scale by 11 trained judges and was also analyzed to produce its 3-Hz bandwidth frequency-by-amplitude acoustic spectrum. The median roughness rating and the level of inharmonic spectral components, i.e., noise components, for each production were examined and related. Noise levels for the productions of each vowel averaged over selected spectral ranges between 100 Hz and 8000 Hz correlated highly with the median roughness ratings for those productions. Multiple correlation coefficients indicating the relationship between the median roughness rating and multiple measures of spectral noise in the range from 100 Hz to 2600 Hz for the individual productions of each test vowel were high (≥0.97) and significant for all five vowels.

scholarly journals Determination of fatty acids and lipid classes in salmon oil by near infrared spectroscopy

2018 ◽  
Vol 239 ◽  
pp. 865-871 ◽  
Author(s):  
Mari Merce Cascant ◽  
Cassandra Breil ◽  
Anne Silvie Fabiano-Tixier ◽  
Farid Chemat ◽  
Salvador Garrigues ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Infrared Spectroscopy ◽  
Near Infrared Spectroscopy ◽  
Near Infrared ◽  
Lipid Classes

Measuring Exercise Self-Efficacy in Pregnant Women: Psychometric Properties of the Pregnancy-Exercise Self-Efficacy Scale (P-ESES)

2013 ◽  
Vol 21 (3) ◽  
pp. 349-359 ◽  
Author(s):  
Helen W. Bland ◽  
Bridget F. Melton ◽  
Elaine S. Marshall ◽  
Jacquelyn A. Nagle
Keyword(s):  
Pregnant Women ◽  
Psychometric Properties ◽  
Self Efficacy ◽  
Correlation Coefficients ◽  
Validity And Reliability ◽  
Multiple Correlation ◽  
Components Analysis ◽  
Multiple Correlation Coefficients ◽  
Original Measure ◽  
Activity Questionnaires

Background and Purpose: This study assessed the psychometric properties of a modified self-efficacy scale—the Pregnancy-Exercise Self-Efficacy Scale (P-ESES). Methods: Pregnant women completed the P-ESES and physical activity questionnaires (N = 88). Results: Internal consistency was confirmed by Cronbach’s alpha (α = 0.838) and equal-length Spearman–Brown (α = 8.22). Squared multiple correlation coefficients were calculated showing 9 of 10 items with values greater than the desired .5. A nonrotated exploratory principal components analysis confirmed the same 9 of 10 items loaded on a single factor, accounting for 46.1% of the variance. Each item had an acceptable load value of .40 or higher. Conclusions: Initial testing of the P-ESES confirmed validity and reliability with the exception of 1 item from the original measure: “Exercising without physician approval.”

scholarly journals Quantification of glycated hemoglobin indicator HbA1c through near-infrared spectroscopy

2014 ◽  
Vol 07 (04) ◽  
pp. 1350060 ◽  
Author(s):  
Tao Pan ◽  
Minmiao Li ◽  
Jiemei Chen ◽  
Haiyan Xue
Keyword(s):  
Near Infrared ◽  
Glycated Hemoglobin ◽  
Correlation Coefficients ◽  
Partial Least Square ◽  
Least Square ◽  
Spectral Determination ◽  
Spectroscopic Analyses ◽  
Biochemical Indicator ◽  
New Strategy

A new strategy for quantitative analysis of a major clinical biochemical indicator called glycated hemoglobin (HbA1c) was proposed. The technique was based on the simultaneous near-infrared (NIR) spectral determination of hemoglobin (Hb) and absolute HbA1c content (Hb • HbA1c) in human hemolysate samples. Wavelength selections were accomplished using the improved moving window partial least square (MWPLS) method for stability. Each model was established using an approach based on randomness, similarity, and stability to obtain objective, stable, and practical models. The optimal wavebands obtained using MWPLS were 958 to 1036 nm for Hb and 1492 to 1858 nm for Hb • HbA1c, which were within the NIR overtone region. The validation root mean square error and validation correlation coefficients of prediction (V-SEP, V-R P ) were 3.4 g L-1 and 0.967 for Hb, respectively, whereas the corresponding values for Hb • HbA1c were 0.63 g L-1 and 0.913. The corresponding V-SEP and V-R P were 0.40% and 0.829 for the relative percentage of HbA1c. The experimental results confirm the feasibility for the quantification of HbA1c based on simultaneous NIR spectroscopic analyses of Hb and Hb • HbA1c.

Determination of Fatty Acids and Stable Carbon Isotopic Ratio in Subcutaneous Fat to Identify the Feeding Regime of Iberian Pigs

2015 ◽  
Vol 63 (2) ◽  
pp. 692-699 ◽  
Author(s):  
María Asunción López-Bascón ◽  
Feliciano Priego-Capote ◽  
Mónica Calderón-Santiago ◽  
Verónica Sánchez de Medina ◽  
José Manuel Moreno-Rojas ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Isotopic Ratio ◽  
Subcutaneous Fat ◽  
Stable Carbon ◽  
Feeding Regime ◽  
Carbon Isotopic Ratio ◽  
Carbon Isotopic

Interrelationships among Food Intake, Somatic Traits, and Physical Fitness in 10.5- to 15.5-Year-Old Children From Eastern Poland

1998 ◽  
Vol 8 (4) ◽  
pp. 388-400 ◽  
Author(s):  
Grzegorz Raczyński ◽  
Jan Czeczelewski ◽  
Maciej Skład ◽  
Romuald Stupnicki
Keyword(s):  
Food Intake ◽  
Physical Fitness ◽  
Energy Intake ◽  
Correlation Coefficients ◽  
Dietary Quality ◽  
Multiple Correlation ◽  
Dietary Recall ◽  
Somatic Development ◽  
Nutrition Quality ◽  
Multiple Correlation Coefficients

The aim of the study was to establish the relationships between energy intake and dietary quality with somatic variables and physical fitness. Energy intake and nutrition quality were assessed from 24-hr dietary recall questionnaires, and physical fitness was measured by applying the EUROFIT tests. Interrelationships between all those variables (simple, partial, and multiple correlation coefficients) were computed from standardized values. The somatic and physical fitness variables related more strongly on the nutrition quality than on the energy intake. Well-nourished children were taller, heavier, and more physically fit than the poorly nourished ones. We believe that dietary quality affected physical fitness indirectly by influencing somatic development. Energy intake did not contribute significantly to the total variance of the physical fitness factor.

Sign in / Sign up

Export Citation Format

Share Document