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Grundy MML, Grassby T, Mandalari G, Waldron KW, Butterworth PJ, Berry SEE, Ellis PR. Effect of mastication on lipid bioaccessibility of almonds in a randomized human study and its implications for digestion kinetics, metabolizable energy, and postprandial lipemia. Am J Clin Nutr 2015; 101:25-33. [PMID: 25527747 PMCID: PMC4266890 DOI: 10.3945/ajcn.114.088328] [Citation(s) in RCA: 90] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2014] [Accepted: 10/07/2014] [Indexed: 12/22/2022] Open
Abstract
BACKGROUND The particle size and structure of masticated almonds have a significant impact on nutrient release (bioaccessibility) and digestion kinetics. OBJECTIVES The goals of this study were to quantify the effects of mastication on the bioaccessibility of intracellular lipid of almond tissue and examine microstructural characteristics of masticated almonds. DESIGN In a randomized, subject-blind, crossover trial, 17 healthy subjects chewed natural almonds (NAs) or roasted almonds (RAs) in 4 separate mastication sessions. Particle size distributions (PSDs) of the expectorated boluses were measured by using mechanical sieving and laser diffraction (primary outcome). The microstructure of masticated almonds, including the structural integrity of the cell walls (i.e., dietary fiber), was examined with microscopy. Lipid bioaccessibility was predicted by using a theoretical model, based on almond particle size and cell dimensions, and then compared with empirically derived release data. RESULTS Intersubject variations (n = 15; 2 subjects withdrew) in PSDs of both NA and RA samples were small (e.g., laser diffraction; CV: 12% and 9%, respectively). Significant differences in PSDs were found between these 2 almond forms (P < 0.05). A small proportion of lipid was released from ruptured cells on fractured surfaces of masticated particles, as predicted by using the mathematical model (8.5% and 11.3% for NAs and RAs, respectively). This low percentage of lipid bioaccessibility is attributable to the high proportion (35-40%) of large particles (>500 μm) in masticated almonds. Microstructural examination of the almonds indicated that most intracellular lipid remained undisturbed in intact cells after mastication. No adverse events were recorded. CONCLUSIONS Following mastication, most of the almond cells remained intact with lipid encapsulated by cell walls. Thus, most of the lipid in masticated almonds is not immediately bioaccessible and remains unavailable for early stages of digestion. The lipid encapsulation mechanism provides a convincing explanation for why almonds have a low metabolizable energy content and an attenuated impact on postprandial lipemia.
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Affiliation(s)
- Myriam M L Grundy
- From the Biopolymers Group, Diabetes and Nutritional Sciences Division, King's College London, United Kingdom (MMLG, TG, PJB, SEEB, and PRE); the Institute of Food Research, Norwich Research Park, United Kingdom (GM and KWW); and the Department of Drug Science and Products for Health, University of Messina, Italy (GM)
| | - Terri Grassby
- From the Biopolymers Group, Diabetes and Nutritional Sciences Division, King's College London, United Kingdom (MMLG, TG, PJB, SEEB, and PRE); the Institute of Food Research, Norwich Research Park, United Kingdom (GM and KWW); and the Department of Drug Science and Products for Health, University of Messina, Italy (GM)
| | - Giuseppina Mandalari
- From the Biopolymers Group, Diabetes and Nutritional Sciences Division, King's College London, United Kingdom (MMLG, TG, PJB, SEEB, and PRE); the Institute of Food Research, Norwich Research Park, United Kingdom (GM and KWW); and the Department of Drug Science and Products for Health, University of Messina, Italy (GM)
| | - Keith W Waldron
- From the Biopolymers Group, Diabetes and Nutritional Sciences Division, King's College London, United Kingdom (MMLG, TG, PJB, SEEB, and PRE); the Institute of Food Research, Norwich Research Park, United Kingdom (GM and KWW); and the Department of Drug Science and Products for Health, University of Messina, Italy (GM)
| | - Peter J Butterworth
- From the Biopolymers Group, Diabetes and Nutritional Sciences Division, King's College London, United Kingdom (MMLG, TG, PJB, SEEB, and PRE); the Institute of Food Research, Norwich Research Park, United Kingdom (GM and KWW); and the Department of Drug Science and Products for Health, University of Messina, Italy (GM)
| | - Sarah E E Berry
- From the Biopolymers Group, Diabetes and Nutritional Sciences Division, King's College London, United Kingdom (MMLG, TG, PJB, SEEB, and PRE); the Institute of Food Research, Norwich Research Park, United Kingdom (GM and KWW); and the Department of Drug Science and Products for Health, University of Messina, Italy (GM)
| | - Peter R Ellis
- From the Biopolymers Group, Diabetes and Nutritional Sciences Division, King's College London, United Kingdom (MMLG, TG, PJB, SEEB, and PRE); the Institute of Food Research, Norwich Research Park, United Kingdom (GM and KWW); and the Department of Drug Science and Products for Health, University of Messina, Italy (GM)
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Zheng Y, Yu X, Xu X, Jin D, Yue L. Preparation of ZnO particle with novel nut-like morphology by ultrasonic pretreatment and its luminescence property. Ultrason Sonochem 2010; 17:7-10. [PMID: 19577946 DOI: 10.1016/j.ultsonch.2009.06.010] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/06/2009] [Revised: 06/03/2009] [Accepted: 06/12/2009] [Indexed: 05/28/2023]
Abstract
Novel nut-like zinc oxide crystal has been prepared by a low temperature hydrothermal method with the presence of Cu(2+) ion. It seemed that the ultrasonic pretreatment was the key factor during the preparation process. SEM observations revealed that the as-prepared ZnO crystal exhibited nut shape showing well-defined crystallographic facets. The cross-section of the ZnO crystal was hexagonal of about 800 nm-1 microm in diameter, and the aspect ratio was a little smaller than 1:1. The room temperature photoluminescence behavior of the nut-like zinc oxide crystal was much stronger than the reference samples.
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Affiliation(s)
- Yifan Zheng
- Research Center of Analysis and Measurement, Zhejiang University of Technology, Hangzhou 310014, People's Republic of China.
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Reischig P, Blaas J, Botha C, Bravin A, Porra L, Nemoz C, Wallert A, Dik J. A note on medieval microfabrication: the visualization of a prayer nut by synchrotron-based computer X-ray tomography. J Synchrotron Radiat 2009; 16:310-313. [PMID: 19240345 DOI: 10.1107/s0909049508043082] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2008] [Accepted: 12/17/2008] [Indexed: 05/27/2023]
Abstract
One of the most fascinating objects in the Rijksmuseum (Amsterdam, The Netherlands) is an early 16th century prayer nut. This spherical wooden object measures 4 cm in diameter and consists of two hemispheres connected with a small hinge so that it can be opened. The interior of the nut holds wood carvings with scenes from the life of Christ. These miniature reliefs show an incredible degree of finish with carving details well beyond the millimetre scale. In the present paper it is shown how synchrotron-based computer X-ray tomography revealed the structure and fabrication method of the bead. The central part of the relief was cut from a single piece of wood, rather than assembled from multiple components, underlining the extraordinary manual dexterity of its maker. In addition, a piece of fibrous material contained in the inner structure of the bead is revealed. This may have served as a carrier for an odorous compound, which would be in line with the religious function of the prayer nut.
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Haykiri-Acma H, Yaman S. Effect of co-combustion on the burnout of lignite/biomass blends: a Turkish case study. Waste Manag 2008; 28:2077-2084. [PMID: 17964772 DOI: 10.1016/j.wasman.2007.08.028] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/15/2006] [Revised: 05/23/2007] [Accepted: 08/22/2007] [Indexed: 05/25/2023]
Abstract
Co-combustion of Turkish Elbistan lignite and woody shells of hazelnut was performed in a TGA up to 1173 K with a heating rate of 20 K/min. SEM images of each fuel revealed the differences in their physical appearances. Hazelnut shell was blended with lignite in the range of 2-20 wt% to observe the co-combustion properties. Maximum burning rates (Rmax), temperatures of the maximum burning rates (T(R-max)), and the final burnout values of the parent samples and the blends were compared. The results were interpreted considering lignite properties and the major biomass ingredients such as cellulosics, hemicellulosics, and lignin. Deviations between the theoretical and experimental burnout values were evaluated at various temperatures. Burnout characteristics of the blends up to 10 wt% were concluded to have a synergistic effect so the addition of hazelnut shell up to 8 wt% provided higher burnouts than the expected theoretical ones, whereas addition of as much as 10 wt% led to a decrease in the burnout. However, the additive effects were more favorable for the blend having a biomass content of 20 wt%. Apparent activation energy, Rmax, and T(R-max), were found to follow the additive behavior for the blend samples.
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Affiliation(s)
- H Haykiri-Acma
- Istanbul Technical University, Chemical and Metallurgical Engineering Faculty, Chemical Engineering Department, Maslak 34469, Istanbul, Turkey
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Muravnik LE. [The trichomes of pericarp in Juglans (Juglandaceae): scanning microscopy, fluorescent microscopy amd histochemistry]. Tsitologiia 2008; 50:636-642. [PMID: 18771180] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Four types of glandular and non-glandular trichomes of pericarp in four Juglans species (J. ailanthifolia, J. cordiformis, J. mandshurica and J. regia) from Juglandaceae were studied by scanning electron microscopy, fluorescent light microscopy and histochemistry. The capitate trichomes on short stalk, the capitate trichomes on long stalk and the peltate trichomes belong to glandular trichomes; the simple hairs concern to non-glandular trichomes. The investigated species differ one from another in dimensions and distribution oftrichomes as well as the chemical content and the mechanism of secretion. The fluorescent markers and histochemical tests show the presence of flavonoids, tannins and polyphenols in trichomes on short and long stalk. In peltate trichomes the flavonoids and tannins were found in lesser quantity and the polyphenols are absent. In simple hairs the phenolic substances have not been recognized. It has been come out with the suggestion about a functional role of each type of trichomes.
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Moon HK, Hong SP. Nutlet morphology and anatomy of the genus Lycopus (Lamiaceae: Mentheae). J Plant Res 2006; 119:633-44. [PMID: 16972047 DOI: 10.1007/s10265-006-0023-6] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2006] [Accepted: 06/14/2006] [Indexed: 05/11/2023]
Abstract
Nutlet morphology and pericarp structure of 16 species in the genus Lycopus were studied by light microscopy (LM) and scanning electron microscopy (SEM), and a detailed description of nutlet morphological features for all examined taxa is provided. The nutlets of all taxa in the genus Lycopus are well adapted to typical hydrochory (or nautochory) with an air-filled pericarp, and myxocarpy was not at all found. It is noteworthy that the nutlet morphology (in particular the shape of corky crests and corky ring and the distribution of glandular trichomes) and pericarp anatomy of Lycopus are unique and are well distinguished from the other genera in the tribe Mentheae. We also found some groups of the species within the genus Lycopus by the present nutlet morphological and anatomical data that appear to be useful as diagnostic characteristics for delineation purposes at the specific/interspecific levels. The earlier infrageneric classification for the genus Lycopus is, however, not well supported by the present results. In addition, the systematic and biological implications of the nutlet characteristics investigated are briefly discussed.
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Affiliation(s)
- Hye-Kyoung Moon
- Laboratory of Plant Systematics, Department of Biology and Research Institute for Basic Sciences, Kyung Hee University, 1 Hoegi-Dong, Dongdaemun-Gu, Seoul, South Korea
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Abstract
BACKGROUND AND AIMS Macadamia integrifolia, M. tetraphylla and their hybrids are cultivated for their edible kernels. Whole kernels, i.e. intact mature embryos with cotyledons fused together, are highly valued and breakage of embryos into halves results in loss of value for the commercial macadamia industry. The morphology and ultrastructure of the mature macadamia embryo, with particular emphasis on the break zone between cotyledons, were investigated. Differences in breakage between different macadamia cultivars were also examined. METHODS Manual cracking was used to compare breakage in five cultivars and the ultrastructure of the break zone between the cotyledons was examined using light and transmission electron microscopy. KEY RESULTS Breakage of macadamia embryos was strongly dependent on genotype of the female parent, with cultivars 'HAES 344' and 'HAES 741' much more likely to break than 'HV A16' and 'HAES 835'. Cotyledons were surrounded by a layer of cuticle resulting in a double cuticle in the break zone between the cotyledons. Three major differences have been found in the ultrastructure of the double cuticle between cultivars: a thicker cuticle in the low-whole cultivar; convolutions in the cuticle of a low-whole cultivar, and the presence of more electron-dense objects in the high-whole cultivar. CONCLUSIONS Breakage of macadamia embryos depends on the cultivar, with clear ultrastructural differences in the break zone between cultivars. To ensure commercial benefits, macadamia breeding programs should identify germplasm with structural characteristics that ensure high percentages of whole kernel.
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Affiliation(s)
- David A Walton
- Faculty of Science, University of the Sunshine Coast, Maroochydore DC, Qld 4558, Australia.
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Rajan A, Senan RC, Pavithran C, Abraham TE. Biosoftening of coir fiber using selected microorganisms. Bioprocess Biosyst Eng 2005; 28:165-73. [PMID: 16220267 DOI: 10.1007/s00449-005-0023-2] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2005] [Accepted: 09/09/2005] [Indexed: 10/25/2022]
Abstract
Coir fiber belongs to the group of hard structural fibers obtained from coconut husk. As lignin is the main constituent of coir responsible for its stiffness, microbes that selectively remove lignin without loss of appreciable amounts of cellulose are extremely attractive in biosoftening. Five isolated strains were compared with known strains of bacteria and fungi. The raw fiber treated with Pseudomonas putida and Phanerocheate chrysosporium produced better softened fiber at 30+/-2 degrees C and neutral pH. FeSO4 and humic acid were found to be the best inducers for P. chrysosporium and P. putida, respectively, while sucrose and dextrose were the best C-sources for both. Biosoftening of unretted coir fibers was more advantageous than the retted fibers. Unlike the weak chemically softened fiber, microbial treatment produced soft, whiter fibers having better tensile strength and elongation (44.6-44.8%) properties. Scanning electron microscopy photos showed the mycelia penetrating the pores of the fiber, removing the tylose plug and degrading lignin.
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Affiliation(s)
- Akhila Rajan
- Bioactive Polymer Engineering Section, Polymer Division, Regional Research Laboratory (CSIR), Trivandrum, 695 019 Kerala, India
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Bonelli PR, Della Rocca PA, Cerrella EG, Cukierman AL. Effect of pyrolysis temperature on composition, surface properties and thermal degradation rates of Brazil Nut shells. Bioresour Technol 2001; 76:15-22. [PMID: 11315805 DOI: 10.1016/s0960-8524(00)00085-7] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Changes in chemical and surface characteristics of Brazil Nut shells (Bertholletia excelsa) due to pyrolysis at different temperatures (350 degrees C, 600 degrees C, 850 degrees C) were examined. For this purpose, proximate and ultimate analyses, physical adsorption measurements of N2 (-196 degrees C) and CO, (25 degrees C) as well as samples visualisation by scanning electronic microscopy (SEM) were performed. Appreciable differences in the residue characteristics, depending markedly on the pyrolysis temperature, were observed. Release of volatile matter led to the development of pores of different sizes. Progressive increases in micropore development with increasing pyrolysis temperature took place, whereas a maximum development of larger pores occurred at 600 degrees C. Furthermore, kinetics measurements of Brazil Nut shells pyrolysis from ambient temperature up to 900 degrees C were performed by non-isothermal thermogravimetric analysis. A model taking into account the significant changes in the residue during pyrolysis, through an increase in the activation energy with temperature and solid conversion, were found to properly fit the kinetics data over the wide range of degradation investigated.
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Affiliation(s)
- P R Bonelli
- PINMATE, Departmento de Industrias, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Argentina
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Tang H, Belton PS, Ng A, Ryden P. 13C MAS NMR studies of the effects of hydration on the cell walls of potatoes and Chinese water chestnuts. J Agric Food Chem 1999; 47:510-517. [PMID: 10563925 DOI: 10.1021/jf980553h] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
13C NMR with magic angle spinning (MAS) has been employed to investigate the cell walls of potatoes and Chinese water chestnuts over a range of hydration levels. Both single-pulse excitation (SPEMAS) and cross-polarization (CPMAS) experiments were carried out. Hydration led to a substantial increase in signal intensities of galactan and galacturonan in the SPEMAS spectra and a decrease in line width, implying mobilization in the backbone and side chains of pectin. In CPMAS spectra of both samples, noncellulose components showed signal loss as hydration increased. However, the signals of some galacturonan in the 3(1) helix configuration remained in the spectra even when the water content was as high as 110%. Cellulose was unaffected. It is concluded that the pectic polysaccharides experience a distribution of molecular conformations and mobility, whereas cellulose remained as typical rigid solid.
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Affiliation(s)
- H Tang
- Institute of Food Research, Norwich Research Park, Colney, Norwich, United Kingdom
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