Assessing the Quality of Huanglongbing Symptomatic and Asymptomatic Orange Oils from Florida Hamlin and Valencia Oranges
Başlık:
Assessing the Quality of Huanglongbing Symptomatic and Asymptomatic Orange Oils from Florida Hamlin and Valencia Oranges
Yazar:
Hubbard, Brittany Martin, author.
ISBN:
9780438120587
Yazar Ek Girişi:
Fiziksel Tanımlama:
1 electronic resource (111 pages)
Genel Not:
Source: Dissertation Abstracts International, Volume: 79-11(E), Section: B.
Özet:
Florida grown Hamlin and Valencia oranges were harvested twice each in the 2014-2015 and 2015-2016 harvest years. During each harvest, both huanglongbing (HLB) asymptomatic and symptomatic fruit were harvested. Cold pressed orange oil was extracted, purified, and analyzed via several quality measurements including the US Pharmacopeia mandated physicochemical tests (aldehyde content, UV absorbance, optical rotation, specific gravity, and refractive index), flavor panels, aroma panels, and qualitative and quantitative gas chromatography.
Both symptomatic and asymptomatic Hamlin oils had aldehyde contents below the US Pharmacopeia minimum (1.2%) for both harvest years. For Hamlin Early 2015-2016, there were significant differences between symptomatic and asymptomatic oils for aldehyde content, specific gravity, UV absorbance, and optical rotation. There were no significant differences between solutions made with Hamlin asymptomatic and symptomatic oils in flavor panels; however, aroma panels showed significant differences between Hamlin Early asymptomatic and symptomatic oils.
Several differences were seen between asymptomatic and symptomatic Valencia oils for the US Pharmacopeia tests for both the 2014-2015 and 2015-2016 harvest years. Additionally, late season symptomatic Valencia oils exceeded the US Pharmacopeia maximum for specific gravity for both years. There were no significant differences between solutions made with Valencia asymptomatic and symptomatic oils in flavor panels; however, aroma panels showed significant differences between Late Valencia asymptomatic and symptomatic oils.
For both Hamlin and Valencia oils, several compounds important to orange aroma had significantly different volatile concentrations between asymptomatic and symptomatic samples. These volatiles included decanal, linalool, citronellal, citronellol, neral, geranial, perillaldehyde, carvone, citronellyl acetate, alpha-terpinyl acetate, and dodecanal. While most volatiles were found at lower concentrations in symptomatic oil, citronellol was found at significantly higher concentrations in both Hamlin and Valencia symptomatic oil while the esters citronellyl acetate and alpha-terpinyl acetate were found at significantly higher concentrations in symptomatic Hamlin oil.
Research on the effect of HLB on the volatile composition of cold pressed orange oil has not previously been published. This work is important to those working in the flavor and fragrance industries, for whom cold pressed orange oil and/or its chemical fractions are important products used in the formulation of many beverages, flavors and perfumes.
Notlar:
School code: 0070
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Yer Numarası | Demirbaş Numarası | Shelf Location | Lokasyon / Statüsü / İade Tarihi |
---|---|---|---|
XX(696600.1) | 696600-1001 | Proquest E-Tez Koleksiyonu | Arıyor... |
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