Hydrocarbons present in saturated fractions of crude oils can be assessed by atmospheric pressure chemical ionization (APCI) using small hydrocarbons as ionizing reagents in a Fourier transform ion cyclotron resonance mass spectrometer (FT-ICR MS). In this work, five paraffin standards of different average molar mass distributions (Mw) were easily ionized by APCI(+)FT-ICR MS using isooctane as the reagent gas. Data of Mw, carbon number and double bond equivalent (DBE) distributions corresponding to linear and cyclic hydrocarbons (HCs) were compared to results obtained from analysis of high temperature gas chromatography with a flame ionization detector (HTGC-FID), comprehensive two-dimensional gas chromatography coupled to mass spectrometry (GC×GC-MS) and 1H and 13C nuclear magnetic resonance (NMR) spectroscopy. APCI(+)FT-ICR MS data showed good agreement with those of analytical techniques. Furthermore, the ability of APCI(+) to assess n-paraffin, even in blends with polyaromatic hydrocarbon molecules such as coronene (Mw = 301 Da) at concentrations from 2.5 to 25 µg mL-1, was demonstrated. The typical MS paraffin profile (containing repeating mass units of 14 Da) was clearly confirmed, being totally suppressed when a concentration of 25 µg mL-1 of coronene was used. This phenomenon was also evidenced in one of two saturated fractions produced using saturates, aromatics and polar (SAP) compound fractionation methodology.

Foram realizadas coletas de moscas-das-frutas em armadilhas e frutos na região semi-árida do Rio Grande do Norte, de janeiro/1999 a dezembro/2000. Dez espécies foram capturadas: Anastrepha alveata Stone, A. dissimilis Stone, A. distincta Greene, A. montei Lima, A. obliqua (Macquart), A. pickeli Lima, A. sororcula Zucchi, A. zenildae Zucchi, Anastrepha sp. aff. pickeli e Ceratitis capitata (Wied). Das 41 espécies de fruteiras amostradas, os frutos de 17 espécies estavam infestados por pelo menos uma espécie de moscas-das-frutas. Os novos registros de hospedeiros são: A. sororcula em cajarana (Spondias sp.), A. zenildae em cajarana, acerola (Malpighia emarginata DC.) e kunquat (Fortunella sp.), Anastrepha sp. aff. pickeli em maniçoba (Manihot glaziovii Muell.) e C. capitata em umbu (Spondias tuberosa Arruda), trapia (Crateva tapia L.) e juá (Ziziphus joazeiro Mart.).Os principais hospedeiros de Anastrepha spp. foram juá, cajarana e goiaba (Psidium guajava L.) e de C. capitata foi a serigüela (Spondias purpurea L.). O hospedeiro mais infestado pelas espécies de Anastrepha foi o juá (67,7 pupários/kg) e por C. capitata foi o kunquat [Fortunella japonica (Thunb.) (159,1 pupários/kg)].

Fruit flies were collected in traps and also reared from fruits in the semi-arid of the State of Rio Grande do Norte, from January 1999 to December 2000. Ten fruit fly species were obtained: Anastrepha alveata Stone, A. dissimilis Stone, A. distincta Greene, A. montei Lima, A. obliqua (Macquart), A. pickeli Lima, A. sororcula Zucchi, A. zenildae Zucchi, Anastrepha sp. aff. pickeli, and Ceratitis capitata (Wied.). Seventeen out of the 41 fruit tree species sampled were infested at least by one fruit fly species. New host records are: A. sororcula from Spondias sp., A. zenildae from Spondias sp., West Indian cherry (Malpighia emarginata DC.) and kumquat (Fortunella sp.), Anastrepha sp. aff. pickeli from Manihot glaziovii Muell. and C. capitata from Spondias tuberosa Arruda, Crateva tapia L.and Ziziphus joazeiro Mart. The main host plants for Anastrepha spp. were Z. joazeiro, Spondias sp. and guava (Psidium guajava L.) and for C. capitata was red coat plum (Spondias purpurea L.). The most infested host plant of Anastrepha spp. was Z. joazeiro (67.7 puparia/kg) and by C. capitata was kumquat [Fortunella japonica (Thunb.) (159.1 puparia/kg)].