scispace - formally typeset
Search or ask a question
Author

Robert J. Horvat

Bio: Robert J. Horvat is an academic researcher from United States Department of Agriculture. The author has contributed to research in topics: Hexanal & Autoxidation. The author has an hindex of 18, co-authored 33 publications receiving 1160 citations.

Papers
More filters
Journal ArticleDOI
TL;DR: In this paper, size, weight, soluble solids (SS), sucrose content, SS/TA ratio, volatiles, and Minolta a value increased with increased maturity of unripened fruit.
Abstract: In general, size, weight, soluble solids (SS), sucrose content, SS/TA ratio, volatiles, and Minolta a value increased with increased maturity of unripened fruit. Minolta L and b values, glucose, fructose, and sorbitol contents, and total phenolics did not vary significantly by maturity. Titratable acidity and hue angle decreased with increased maturity. After 4-week storage, significant deterioration probably will occur

110 citations

Journal ArticleDOI
TL;DR: In this paper, the relationship between the changes in sugars and nonvolatile acids relative to the aroma volatile compounds during maturation was investigated and it was shown that such changes could be useful indices of maturity for Majestic peaches.
Abstract: The study was undertaken to determine the relationship between the changes in sugars and nonvolatile acids relative to the aroma volatile compounds during maturation and to determine if such changes could be useful indices of maturity for Majestic peaches.

97 citations

Journal ArticleDOI
TL;DR: In this article, a new method was presented for determining thecis/trans isomer content of edible vegetable oils based on the intensities of Raman lines near 1656 and 1670 cm−1.
Abstract: A new method is presented for determining thecis/trans isomer content of edible vegetable oils. The intensities of Raman lines near 1656 and 1670 cm−1 are associated with thecis andtrans configuration, respectively. A precision of ca. 1% can be obtained in thecis/trans isomer analysis of binary mixtures of methyl esters and triglycerides of monoenes and dienes and of hydrogenated vegetable oils. The spectroscopic data also provide the iodine value of vegetable oils or isolated fractions with precision for a single determination of ca. 1%.

92 citations


Cited by
More filters
Journal ArticleDOI
TL;DR: A review of phenolic and polyphenolic compounds can be found in this article, which summarizes both the synthetic and natural phenolic antioxidants, emphasizing their mode of action, health effects, degradation products and toxicology.

1,800 citations

Journal ArticleDOI
TL;DR: The results suggest that R • induced damage may provide a stimulus to the mitochondrial biogenesis which results from endurance training.

1,716 citations

Journal ArticleDOI
TL;DR: Comparisons showed that peach has not undergone recent whole-genome duplication, and even though the ancestral triplicated blocks in peach are fragmentary compared to those in grape, all seven paleosets of paralogs from the putative paleoancestor are detectable.
Abstract: Rosaceae is the most important fruit-producing clade, and its key commercially relevant genera (Fragaria, Rosa, Rubus and Prunus) show broadly diverse growth habits, fruit types and compact diploid genomes. Peach, a diploid Prunus species, is one of the best genetically characterized deciduous trees. Here we describe the high-quality genome sequence of peach obtained from a completely homozygous genotype. We obtained a complete chromosome-scale assembly using Sanger whole-genome shotgun methods. We predicted 27,852 protein-coding genes, as well as noncoding RNAs. We investigated the path of peach domestication through whole-genome resequencing of 14 Prunus accessions. The analyses suggest major genetic bottlenecks that have substantially shaped peach genome diversity. Furthermore, comparative analyses showed that peach has not undergone recent whole-genome duplication, and even though the ancestral triplicated blocks in peach are fragmentary compared to those in grape, all seven paleosets of paralogs from the putative paleoancestor are detectable.

935 citations

Journal ArticleDOI
TL;DR: The secondary metabolites isolated from Piper species for the period 1907 to June 1996 have been reviewed in this paper, where nearly six hundred chemical constituents belonging to different classes of bioactive compounds are listed together with their source(s) and references.

849 citations

02 Feb 2008
TL;DR: It is in developing countries which are rich in endemic plant biodiversity that these pesticides may ultimately have their greatest impact in future integrated pest management (IPM) programmes due to their safety to non-target organisms and the environment.
Abstract: Many plant essential oils show a broad spectrum of activity against pest insects and plant pathogenic fungi ranging from insecticidal, antifeedant, repellent, oviposition deterrent, growth regulatory and antivector activities. These oils also have a long tradition of use in the protection of stored products. Recent investigations indicate that some chemical constituents of these oils interfere with the octopaminergic nervous system in insects. As this target site is not shared with mammals, most essential oil chemicals are relatively non-toxic to mammals and fish in toxicological tests, and meet the criteria for "reduced risk" pesticides. Some of these oils and their constituent chemicals are widely used as flavoring agents in foods and beverages and are even exempt from pesticide registration. This special regulatory status combined with the wide availability of essential oils from the flavor and fragrance industries, has made it possible to fast- track commercialization of essential oil-based pesticides. Though well received by consumers for use against home and garden pests, these "green pesticides" can also prove effective in agricultural situations, particularly for organic food production. Further, while resistance development continues to be an issue for many synthetic pesticides, it is likely that resistance will develop more slowly to essential-oil-based pesticides owing to the complex mixtures of constituents that characterize many of these oils. Ultimately, it is in developing countries which are rich in endemic plant biodiversity that these pesticides may ultimately have their greatest impact in future integrated pest management (IPM) programmes due to their safety to non-target organisms and the environment.

771 citations